ai-agent-book 精选快照（<2MB 代码与文档，来自 github.com/bojieli/ai-agent-book）

chapter5/video-edit/validation/runs/exp5-6-real-blender-20260730-052206/localization.json

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+}

chapter5/video-edit/validation/runs/exp5-6-real-blender-20260730-052206/provider_receipts.checkpoint.json

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+      "response": {
+        "id": "02178536014931215b00b15f7b15a122bee0bef9a7107589f12c6",
+        "model": "doubao-seed-1-6-250615",
+        "finish_reason": "stop",
+        "content": "{\"start\":9.0,\"end\":12.0,\"reason\":\"Starts immediately after the 'ONE BIG RABBIT' title (ends at 9.00s) and ends just before the 'THREE RODENTS' title (starts at 12.00s), with continuous visuals of the large white rabbit in the sunny green meadow at 10.00s and 11.00s.\"}"
+      },
+      "usage": {
+        "prompt_tokens": 6555,
+        "completion_tokens": 1158,
+        "total_tokens": 7713
+      },
+      "latency_s": 31.727
+    },
+    {
+      "purpose": "blender_script_negative-control_attempt_1",
+      "provider": "ark",
+      "endpoint": "https://ark.cn-beijing.volces.com/api/v3",
+      "request": {
+        "model": "doubao-seed-1-6-250615",
+        "messages": [
+          {
+            "role": "system",
+            "content": "You are a Blender VSE engineer. Return one JSON object only."
+          },
+          {
+            "role": "user",
+            "content": "Generate a complete Blender 4.3 Python script for this video edit.\n\nInput movie: /Users/boj/book/ai-agent-book/chapter5/video-edit/validation/runs/exp5-6-real-blender-20260730-052206/source.mov\nOutput MP4: /Users/boj/book/ai-agent-book/chapter5/video-edit/validation/runs/exp5-6-real-blender-20260730-052206/negative_control.mp4\nSource FPS: 25\nSource size: 853x480; render at 854x480 (one-pixel even-width pad required by H.264)\nTrim interval: [0.000, 3.000] seconds\nEffects: slow playback so output duration is 1.5 times the trimmed interval; add bottom-centered subtitle BIG BUNNY with a visible semi-transparent dark box.\n\nRequirements:\n- Use bpy and Blender's Video Sequence Editor, including new_movie, new_sound when available, frame_offset_start/frame_final_duration, a SPEED effect, and a TEXT effect.\n- Render exactly 854x480 at 25 fps through Blender to MPEG-4 H.264 with AAC audio.\n- Set the scene frame range to the slowed duration and call bpy.ops.render.render(animation=True).\n- Create only the requested output. Do not invoke ffmpeg, subprocesses, a shell, the network, or read credentials.\n- Use APIs available in Blender 4.3 (scene.sequence_editor_create().sequences).\n- In Blender 4.3, SpeedControlSequence has no use_audio property. Never read or assign use_audio, and do not apply a SPEED effect to the sound strip. A valid movie slow-motion pattern is speed_control='MULTIPLY', speed_factor=1/1.5, and extending the movie/render duration; the sound strip may remain normally trimmed.\n- For the subtitle background, prefer the TEXT strip's use_box=True and box_color=(0,0,0,0.6); do not assume a COLOR strip has text-layout properties.\n\nReturn one JSON object only: {\"code\":\"complete executable Python source\"}.\n"
+          }
+        ],
+        "temperature": 0,
+        "max_tokens": 7000,
+        "response_format": {
+          "type": "json_object"
+        }
+      },
+      "response": {
+        "id": "02178536018101615b00b15f7b15a122bee0bef9a710758b49a93",
+        "model": "doubao-seed-1-6-250615",
+        "finish_reason": "stop",
+        "content": "{\"code\":\"import bpy\\n\\n# Clear existing objects to start fresh\\nbpy.ops.object.select_all(action='SELECT')\\nbpy.ops.object.delete()\\n\\n# Configuration paths and parameters\\nINPUT_MOVIE = \\\"/Users/boj/book/ai-agent-book/chapter5/video-edit/validation/runs/exp5-6-real-blender-20260730-052206/source.mov\\\"\\nOUTPUT_MP4 = \\\"/Users/boj/book/ai-agent-book/chapter5/video-edit/validation/runs/exp5-6-real-blender-20260730-052206/negative_control.mp4\\\"\\nSOURCE_FPS = 25\\nTRIM_DURATION_SECONDS = 3.0\\nSLOW_FACTOR = 1.5\\nRENDER_RESOLUTION = (854, 480)\\n\\n# Calculate frame values\\ntrim_frames = int(TRIM_DURATION_SECONDS * SOURCE_FPS)\\nslowed_frames = int(trim_frames * SLOW_FACTOR)\\nscene = bpy.context.scene\\n\\n# Create sequence editor\\nseq_ed = scene.sequence_editor_create()\\n\\n# Add movie strip with trim\\nmovie_strip = seq_ed.sequences.new_movie(\\n    name=\\\"SourceVideo\\\",\\n    filepath=INPUT_MOVIE,\\n    channel=1,\\n    frame_start=1\\n)\\nmovie_strip.frame_offset_start = 0  # Start at beginning of source\\nmovie_strip.frame_final_duration = trim_frames  # Trim to 3 seconds\\n\\n# Locate and trim audio strip (auto-created with movie)\\nsound_strip = None\\nfor strip in seq_ed.sequences:\\n    if strip.type == 'SOUND' and strip.channel == 2 and strip.frame_start == 1:\\n        sound_strip = strip\\nif sound_strip:\\n    sound_strip.frame_final_duration = trim_frames  # Keep audio at original speed\\n\\n# Add speed effect to video (slow motion)\\nspeed_strip = seq_ed.sequences.new_effect(\\n    name=\\\"SlowMotion\\\",\\n    type='SPEED',\\n    channel=3,\\n    frame_start=1,\\n    frame_end=1 + slowed_frames - 1,\\n    target=movie_strip\\n)\\nspeed_strip.speed_control = 'MULTIPLY'\\nspeed_strip.speed_factor = 1 / SLOW_FACTOR  # 1/1.5 speed factor\\n\\n# Add subtitle text strip with background box\\ntext_strip = seq_ed.sequences.new_text(\\n    name=\\\"Subtitle\\\",\\n    text=\\\"BIG BUNNY\\\",\\n    channel=4,\\n    frame_start=1,\\n    frame_end=1 + slowed_frames - 1\\n)\\ntext_strip.align_x = 'CENTER'\\ntext_strip.align_y = 'BOTTOM'\\ntext_strip.use_box = True\\ntext_strip.box_color = (0.0, 0.0, 0.0, 0.6)  # Black semi-transparent box\\ntext_strip.font_size = 48  # Visible size for 854x480 resolution\\n\\n# Configure render settings\\nscene.render.resolution_x = RENDER_RESOLUTION[0]\\nscene.render.resolution_y = RENDER_RESOLUTION[1]\\nscene.render.resolution_percentage = 100\\nscene.render.fps = SOURCE_FPS\\nscene.render.fps_base = 1.0\\nscene.render.image_settings.file_format = 'FFMPEG'\\nscene.render.ffmpeg.format = 'MPEG4'\\nscene.render.ffmpeg.codec = 'H264'\\nscene.render.ffmpeg.audio_codec = 'AAC'\\nscene.render.filepath = OUTPUT_MP4\\n\\n# Set render frame range\\nscene.frame_start = 1\\nscene.frame_end = 1 + slowed_frames - 1\\n\\n# Execute render\\nbpy.ops.render.render(animation=True)\"}"
+      },
+      "usage": {
+        "prompt_tokens": 614,
+        "completion_tokens": 6404,
+        "total_tokens": 7018
+      },
+      "latency_s": 153.914
+    },
+    {
+      "purpose": "blender_script_negative-control_attempt_2",
+      "provider": "ark",
+      "endpoint": "https://ark.cn-beijing.volces.com/api/v3",
+      "request": {
+        "model": "doubao-seed-1-6-250615",
+        "messages": [
+          {
+            "role": "system",
+            "content": "You are a Blender VSE engineer. Return one JSON object only."
+          },
+          {
+            "role": "user",
+            "content": "Generate a complete Blender 4.3 Python script for this video edit.\n\nInput movie: /Users/boj/book/ai-agent-book/chapter5/video-edit/validation/runs/exp5-6-real-blender-20260730-052206/source.mov\nOutput MP4: /Users/boj/book/ai-agent-book/chapter5/video-edit/validation/runs/exp5-6-real-blender-20260730-052206/negative_control.mp4\nSource FPS: 25\nSource size: 853x480; render at 854x480 (one-pixel even-width pad required by H.264)\nTrim interval: [0.000, 3.000] seconds\nEffects: slow playback so output duration is 1.5 times the trimmed interval; add bottom-centered subtitle BIG BUNNY with a visible semi-transparent dark box.\n\nRequirements:\n- Use bpy and Blender's Video Sequence Editor, including new_movie, new_sound when available, frame_offset_start/frame_final_duration, a SPEED effect, and a TEXT effect.\n- Render exactly 854x480 at 25 fps through Blender to MPEG-4 H.264 with AAC audio.\n- Set the scene frame range to the slowed duration and call bpy.ops.render.render(animation=True).\n- Create only the requested output. Do not invoke ffmpeg, subprocesses, a shell, the network, or read credentials.\n- Use APIs available in Blender 4.3 (scene.sequence_editor_create().sequences).\n- In Blender 4.3, SpeedControlSequence has no use_audio property. Never read or assign use_audio, and do not apply a SPEED effect to the sound strip. A valid movie slow-motion pattern is speed_control='MULTIPLY', speed_factor=1/1.5, and extending the movie/render duration; the sound strip may remain normally trimmed.\n- For the subtitle background, prefer the TEXT strip's use_box=True and box_color=(0,0,0,0.6); do not assume a COLOR strip has text-layout properties.\n\nReturn one JSON object only: {\"code\":\"complete executable Python source\"}.\n\nPrior executable feedback:\nStatic safety/API validation failed: ValueError: generated script omits requested Blender API operations: ['TEXT']"
+          }
+        ],
+        "temperature": 0,
+        "max_tokens": 7000,
+        "response_format": {
+          "type": "json_object"
+        }
+      },
+      "response": {
+        "id": "02178536033493315b00b15f7b15a122bee0bef9a710758de0884",
+        "model": "doubao-seed-1-6-250615",
+        "finish_reason": "stop",
+        "content": "{\"code\":\"import bpy\\n\\n# Clear existing data\\nbpy.ops.wm.read_factory_settings(use_empty=True)\\nscene = bpy.context.scene\\n\\n# Scene settings\\nscene.render.resolution_x = 854\\nscene.render.resolution_y = 480\\nscene.render.resolution_percentage = 100\\nscene.render.fps = 25\\nscene.render.fps_base = 1.0\\n\\n# Create sequence editor\\nif not scene.sequence_editor:\\n    scene.sequence_editor_create()\\nseq_ed = scene.sequence_editor\\nsequences = seq_ed.sequences\\n\\n# File paths\\ninput_movie = '/Users/boj/book/ai-agent-book/chapter5/video-edit/validation/runs/exp5-6-real-blender-20260730-052206/source.mov'\\noutput_mp4 = '/Users/boj/book/ai-agent-book/chapter5/video-edit/validation/runs/exp5-6-real-blender-20260730-052206/negative_control.mp4'\\n\\n# Add movie strip (3 seconds = 75 frames at 25fps)\\nmov_strip = sequences.new_movie(\\n    name='SourceMovie',\\n    filepath=input_movie,\\n    frame_start=1,\\n    channel=1\\n)\\nmov_strip.frame_offset_start = 0\\nmov_strip.frame_final_duration = 75  # 3s * 25fps\\n\\n# Locate and trim sound strip\\nsound_strip = next((s for s in sequences if s.type == 'SOUND' and s.frame_start == mov_strip.frame_start), None)\\nif sound_strip:\\n    sound_strip.frame_final_duration = 75  # Keep original audio duration\\n\\n# Add speed effect (1.5x slowdown)\\nspeed_strip = sequences.new_effect(\\n    name='SlowMotion',\\n    type='SPEED',\\n    frame_start=1,\\n    channel=2,\\n    input_1=mov_strip\\n)\\nspeed_strip.speed_control = 'MULTIPLY'\\nspeed_strip.speed_factor = 1 / 1.5\\n\\n# Calculate slowed duration (4.5s = 112.5 frames → 113 frames)\\nslowed_frames = int(4.5 * 25) + 1\\nscene.frame_start = 1\\nscene.frame_end = slowed_frames\\n\\n# Add subtitle text strip\\ntext_strip = sequences.new_effect(\\n    name='Subtitle',\\n    type='TEXT',\\n    frame_start=1,\\n    frame_end=scene.frame_end,\\n    channel=3\\n)\\ntext_strip.text = 'BIG BUNNY'\\ntext_strip.align_x = 'CENTER'\\ntext_strip.align_y = 'BOTTOM'\\ntext_strip.use_box = True\\ntext_strip.box_color = (0, 0, 0, 0.6)\\ntext_strip.font_size = 48\\n\\n# Render settings\\nscene.render.filepath = output_mp4\\nscene.render.image_settings.file_format = 'FFMPEG'\\nscene.render.ffmpeg.format = 'MPEG4'\\nscene.render.ffmpeg.codec = 'H264'\\nscene.render.ffmpeg.audio_codec = 'AAC'\\nscene.render.ffmpeg.constant_rate_factor = 'MEDIUM'\\n\\n# Render animation\\nbpy.ops.render.render(animation=True)\"}"
+      },
+      "usage": {
+        "prompt_tokens": 641,
+        "completion_tokens": 4682,
+        "total_tokens": 5323
+      },
+      "latency_s": 103.993
+    },
+    {
+      "purpose": "blender_script_negative-control_attempt_3",
+      "provider": "ark",
+      "endpoint": "https://ark.cn-beijing.volces.com/api/v3",
+      "request": {
+        "model": "doubao-seed-1-6-250615",
+        "messages": [
+          {
+            "role": "system",
+            "content": "You are a Blender VSE engineer. Return one JSON object only."
+          },
+          {
+            "role": "user",
+            "content": "Generate a complete Blender 4.3 Python script for this video edit.\n\nInput movie: /Users/boj/book/ai-agent-book/chapter5/video-edit/validation/runs/exp5-6-real-blender-20260730-052206/source.mov\nOutput MP4: /Users/boj/book/ai-agent-book/chapter5/video-edit/validation/runs/exp5-6-real-blender-20260730-052206/negative_control.mp4\nSource FPS: 25\nSource size: 853x480; render at 854x480 (one-pixel even-width pad required by H.264)\nTrim interval: [0.000, 3.000] seconds\nEffects: slow playback so output duration is 1.5 times the trimmed interval; add bottom-centered subtitle BIG BUNNY with a visible semi-transparent dark box.\n\nRequirements:\n- Use bpy and Blender's Video Sequence Editor, including new_movie, new_sound when available, frame_offset_start/frame_final_duration, a SPEED effect, and a TEXT effect.\n- Render exactly 854x480 at 25 fps through Blender to MPEG-4 H.264 with AAC audio.\n- Set the scene frame range to the slowed duration and call bpy.ops.render.render(animation=True).\n- Create only the requested output. Do not invoke ffmpeg, subprocesses, a shell, the network, or read credentials.\n- Use APIs available in Blender 4.3 (scene.sequence_editor_create().sequences).\n- In Blender 4.3, SpeedControlSequence has no use_audio property. Never read or assign use_audio, and do not apply a SPEED effect to the sound strip. A valid movie slow-motion pattern is speed_control='MULTIPLY', speed_factor=1/1.5, and extending the movie/render duration; the sound strip may remain normally trimmed.\n- For the subtitle background, prefer the TEXT strip's use_box=True and box_color=(0,0,0,0.6); do not assume a COLOR strip has text-layout properties.\n\nReturn one JSON object only: {\"code\":\"complete executable Python source\"}.\n\nPrior executable feedback:\nBlender exit=0; output_exists=False. Tail of real Blender log:\nBlender 4.3.2 (hash 32f5fdce0a0a built 2024-12-17 02:14:25)\nTraceback (most recent call last):\n  File \"/Users/boj/book/ai-agent-book/chapter5/video-edit/validation/runs/exp5-6-real-blender-20260730-052206/scripts/negative-control-attempt-2.py\", line 40, in <module>\n    speed_strip = sequences.new_effect(\n                  ^^^^^^^^^^^^^^^^^^^^^\nTypeError: SequencesTopLevel.new_effect(): was called with invalid keyword argument(s) (input_1), expected (name, type, channel, frame_start, frame_end, seq1, seq2)\n\nBlender quit"
+          }
+        ],
+        "temperature": 0,
+        "max_tokens": 7000,
+        "response_format": {
+          "type": "json_object"
+        }
+      },
+      "response": {
+        "id": "02178536043966315b00b15f7b15a122bee0bef9a710758ef6add",
+        "model": "doubao-seed-1-6-250615",
+        "finish_reason": "stop",
+        "content": "{\"code\":\"import bpy\\nimport os\\n\\n# Clear default objects\\nbpy.ops.object.select_all(action='SELECT')\\nbpy.ops.object.delete()\\n\\n# Set up scene\\nscene = bpy.context.scene\\nscene.render.fps = 25\\nscene.render.fps_base = 1.0\\nscene.render.resolution_x = 854\\nscene.render.resolution_y = 480\\nscene.render.resolution_percentage = 100\\n\\n# Configure output settings\\nscene.render.image_settings.file_format = 'FFMPEG'\\nscene.render.ffmpeg.format = 'MPEG4'\\nscene.render.ffmpeg.codec = 'H264'\\nscene.render.ffmpeg.audio_codec = 'AAC'\\nscene.render.ffmpeg.audio_bitrate = 192\\noutput_path = '/Users/boj/book/ai-agent-book/chapter5/video-edit/validation/runs/exp5-6-real-blender-20260730-052206/negative_control.mp4'\\nscene.render.filepath = output_path\\n\\n# Create sequence editor\\nscene.sequence_editor_create()\\nsequences = scene.sequence_editor.sequences\\n\\n# Import source movie and sound\\nsource_path = '/Users/boj/book/ai-agent-book/chapter5/video-edit/validation/runs/exp5-6-real-blender-20260730-052206/source.mov'\\nmovie_strip = sequences.new_movie(name='SourceMovie', filepath=source_path, channel=1, frame_start=0)\\n\\nsound_strip = None\\nfor strip in sequences:\\n    if strip.type == 'SOUND' and strip.name.startswith('SourceMovie'):\\n        sound_strip = strip\\n        break\\nif not sound_strip:\\n    sound_strip = sequences.new_sound(name='SourceAudio', filepath=source_path, channel=2, frame_start=0)\\n\\n# Trim to 3-second interval (75 frames at 25fps)\\ntrim_frames = 75  # 3.0s * 25fps\\nmovie_strip.frame_start = 0\\nmovie_strip.frame_final_duration = trim_frames\\nsound_strip.frame_start = 0\\nsound_strip.frame_final_duration = trim_frames\\n\\n# Apply speed effect (1.5x slowdown = 4.5s output)\\nspeed_strip = sequences.new_effect(\\n    name='SpeedControl',\\n    type='SPEED',\\n    channel=2,\\n    frame_start=0,\\n    frame_end=113,  # 75 frames * 1.5 = 112.5 → 113 frames\\n    seq1=movie_strip,\\n    seq2=None\\n)\\nspeed_strip.speed_control = 'MULTIPLY'\\nspeed_strip.speed_factor = 1/1.5\\n\\n# Set scene frame range\\nduration_frames = 113  # 4.5s * 25fps = 112.5 → 113 frames\\nscene.frame_start = 0\\nscene.frame_end = duration_frames\\n\\n# Add subtitle with background box\\ntext_strip = sequences.new_effect(\\n    name='Subtitle',\\n    type='TEXT',\\n    channel=3,\\n    frame_start=0,\\n    frame_end=duration_frames,\\n    seq1=None,\\n    seq2=None\\n)\\ntext_strip.text = 'BIG BUNNY'\\ntext_strip.align_x = 'CENTER'\\ntext_strip.align_y = 'BOTTOM'\\ntext_strip.use_box = True\\ntext_strip.box_color = (0.0, 0.0, 0.0, 0.6)\\ntext_strip.font_size = 48\\n\\n# Render animation\\nbpy.ops.render.render(animation=True)\"}"
+      },
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+        "completion_tokens": 5369,
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+      },
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+    },
+    {
+      "purpose": "blender_script_negative-control_attempt_4",
+      "provider": "ark",
+      "endpoint": "https://ark.cn-beijing.volces.com/api/v3",
+      "request": {
+        "model": "doubao-seed-1-6-250615",
+        "messages": [
+          {
+            "role": "system",
+            "content": "You are a Blender VSE engineer. Return one JSON object only."
+          },
+          {
+            "role": "user",
+            "content": "Generate a complete Blender 4.3 Python script for this video edit.\n\nInput movie: /Users/boj/book/ai-agent-book/chapter5/video-edit/validation/runs/exp5-6-real-blender-20260730-052206/source.mov\nOutput MP4: /Users/boj/book/ai-agent-book/chapter5/video-edit/validation/runs/exp5-6-real-blender-20260730-052206/negative_control.mp4\nSource FPS: 25\nSource size: 853x480; render at 854x480 (one-pixel even-width pad required by H.264)\nTrim interval: [0.000, 3.000] seconds\nEffects: slow playback so output duration is 1.5 times the trimmed interval; add bottom-centered subtitle BIG BUNNY with a visible semi-transparent dark box.\n\nRequirements:\n- Use bpy and Blender's Video Sequence Editor, including new_movie, new_sound when available, frame_offset_start/frame_final_duration, a SPEED effect, and a TEXT effect.\n- Render exactly 854x480 at 25 fps through Blender to MPEG-4 H.264 with AAC audio.\n- Set the scene frame range to the slowed duration and call bpy.ops.render.render(animation=True).\n- Create only the requested output. Do not invoke ffmpeg, subprocesses, a shell, the network, or read credentials.\n- Use APIs available in Blender 4.3 (scene.sequence_editor_create().sequences).\n- In Blender 4.3, SpeedControlSequence has no use_audio property. Never read or assign use_audio, and do not apply a SPEED effect to the sound strip. A valid movie slow-motion pattern is speed_control='MULTIPLY', speed_factor=1/1.5, and extending the movie/render duration; the sound strip may remain normally trimmed.\n- For the subtitle background, prefer the TEXT strip's use_box=True and box_color=(0,0,0,0.6); do not assume a COLOR strip has text-layout properties.\n\nReturn one JSON object only: {\"code\":\"complete executable Python source\"}.\n\nPrior executable feedback:\nStatic safety/API validation failed: ValueError: generated script omits requested Blender API operations: ['frame_offset_start']"
+          }
+        ],
+        "temperature": 0,
+        "max_tokens": 7000,
+        "response_format": {
+          "type": "json_object"
+        }
+      },
+      "response": {
+        "id": "02178536055081715b00b15f7b15a122bee0bef9a71075821cc7c",
+        "model": "doubao-seed-1-6-250615",
+        "finish_reason": "stop",
+        "content": "{\"code\":\"import bpy\\nimport os\\n\\n# Clear existing data\\nbpy.ops.wm.read_factory_settings(use_empty=True)\\n\\n# Get the current scene\\nscene = bpy.context.scene\\n\\n# Set render resolution (854x480 for H.264 even width)\\nscene.render.resolution_x = 854\\nscene.render.resolution_y = 480\\nscene.render.resolution_percentage = 100\\n\\n# Set frame rate (25 FPS)\\nscene.render.fps = 25\\nscene.render.fps_base = 1.0\\n\\n# Output settings\\noutput_path = '/Users/boj/book/ai-agent-book/chapter5/video-edit/validation/runs/exp5-6-real-blender-20260730-052206/negative_control.mp4'\\nscene.render.filepath = output_path\\nscene.render.image_settings.file_format = 'FFMPEG'\\nscene.render.ffmpeg.format = 'MPEG4'\\nscene.render.ffmpeg.codec = 'H.264'\\nscene.render.ffmpeg.audio_codec = 'AAC'\\nscene.render.ffmpeg.audio_mixrate = 44100\\nscene.render.ffmpeg.audio_bitrate = 192\\nscene.render.use_audio = True\\n\\n# Create sequence editor\\nscene.sequence_editor_create()\\nseq_ed = scene.sequence_editor\\n\\n# Source movie path\\nsource_path = '/Users/boj/book/ai-agent-book/chapter5/video-edit/validation/runs/exp5-6-real-blender-20260730-052206/source.mov'\\n\\n# Add video strip with trim (0.000-3.000s = 75 frames @25FPS)\\nvideo_strip = seq_ed.sequences.new_movie(\\n    name='Video',\\n    filepath=source_path,\\n    channel=1,\\n    frame_start=1\\n)\\nvideo_strip.frame_offset_start = 0  # Start at 0s of source\\nvideo_strip.frame_final_duration = 75  # Trim to 3s (75 frames)\\n\\n# Add SPEED effect for slow motion (1.5x duration)\\n speed_effect = seq_ed.sequences.new_effect(\\n    name='SpeedControl',\\n    type='SPEED',\\n    channel=2,\\n    frame_start=1,\\n    seq1=video_strip\\n)\\nspeed_effect.speed_control = 'MULTIPLY'\\nspeed_effect.speed_factor = 1/1.5  # Slow playback speed\\n\\n# Extend video duration to 1.5x trimmed interval (4.5s = 112.5 frames → 113 frames)\\nvideo_strip.frame_final_duration = 113\\n\\n# Configure audio strip (trim to original 3s duration)\\nsound_strip = None\\nfor strip in seq_ed.sequences:\\n    if strip.type == 'SOUND' and strip.name.startswith('Audio'):\\n        sound_strip = strip\\nif sound_strip:\\n    sound_strip.frame_offset_start = 0  # Start at 0s of source audio\\n    sound_strip.frame_final_duration = 75  # Keep original 3s duration\\n\\n# Add subtitle text strip with background box\\ntext_strip = seq_ed.sequences.new_effect(\\n    name='Subtitle',\\n    type='TEXT',\\n    channel=3,\\n    frame_start=1,\\n    frame_final_duration=113\\n)\\ntext_strip.text = 'BIG BUNNY'\\ntext_strip.align_x = 'CENTER'\\ntext_strip.align_y = 'BOTTOM'\\ntext_strip.use_box = True\\ntext_strip.box_color = (0, 0, 0, 0.6)  # Semi-transparent black box\\ntext_strip.font_size = 48\\n\\n# Set scene frame range to match slowed video duration\\nscene.frame_start = 1\\nscene.frame_end = 113\\n\\n# Render the animation\\nbpy.ops.render.render(animation=True)\"}"
+      },
+      "usage": {
+        "prompt_tokens": 643,
+        "completion_tokens": 4515,
+        "total_tokens": 5158
+      },
+      "latency_s": 97.508
+    },
+    {
+      "purpose": "blender_script_negative-control_attempt_5",
+      "provider": "ark",
+      "endpoint": "https://ark.cn-beijing.volces.com/api/v3",
+      "request": {
+        "model": "doubao-seed-1-6-250615",
+        "messages": [
+          {
+            "role": "system",
+            "content": "You are a Blender VSE engineer. Return one JSON object only."
+          },
+          {
+            "role": "user",
+            "content": "Generate a complete Blender 4.3 Python script for this video edit.\n\nInput movie: /Users/boj/book/ai-agent-book/chapter5/video-edit/validation/runs/exp5-6-real-blender-20260730-052206/source.mov\nOutput MP4: /Users/boj/book/ai-agent-book/chapter5/video-edit/validation/runs/exp5-6-real-blender-20260730-052206/negative_control.mp4\nSource FPS: 25\nSource size: 853x480; render at 854x480 (one-pixel even-width pad required by H.264)\nTrim interval: [0.000, 3.000] seconds\nEffects: slow playback so output duration is 1.5 times the trimmed interval; add bottom-centered subtitle BIG BUNNY with a visible semi-transparent dark box.\n\nRequirements:\n- Use bpy and Blender's Video Sequence Editor, including new_movie, new_sound when available, frame_offset_start/frame_final_duration, a SPEED effect, and a TEXT effect.\n- Render exactly 854x480 at 25 fps through Blender to MPEG-4 H.264 with AAC audio.\n- Set the scene frame range to the slowed duration and call bpy.ops.render.render(animation=True).\n- Create only the requested output. Do not invoke ffmpeg, subprocesses, a shell, the network, or read credentials.\n- Use APIs available in Blender 4.3 (scene.sequence_editor_create().sequences).\n- In Blender 4.3, SpeedControlSequence has no use_audio property. Never read or assign use_audio, and do not apply a SPEED effect to the sound strip. A valid movie slow-motion pattern is speed_control='MULTIPLY', speed_factor=1/1.5, and extending the movie/render duration; the sound strip may remain normally trimmed.\n- For the subtitle background, prefer the TEXT strip's use_box=True and box_color=(0,0,0,0.6); do not assume a COLOR strip has text-layout properties.\n\nReturn one JSON object only: {\"code\":\"complete executable Python source\"}.\n\nPrior executable feedback:\nStatic safety/API validation failed: IndentationError: unexpected indent (<unknown>, line 48)"
+          }
+        ],
+        "temperature": 0,
+        "max_tokens": 7000,
+        "response_format": {
+          "type": "json_object"
+        }
+      },
+      "response": {
+        "id": "02178536064833115b00b15f7b15a122bee0bef9a710758d5fc02",
+        "model": "doubao-seed-1-6-250615",
+        "finish_reason": "stop",
+        "content": "{\"code\":\"import bpy\\n\\n# Clear existing data\\nbpy.ops.wm.read_factory_settings(use_empty=True)\\n\\n# Get the scene\\nscene = bpy.context.scene\\n\\n# Set render resolution and FPS\\nscene.render.resolution_x = 854\\nscene.render.resolution_y = 480\\nscene.render.resolution_percentage = 100\\nscene.render.fps = 25\\nscene.render.fps_base = 1.0\\n\\n# Set output settings\\noutput_path = \\\"/Users/boj/book/ai-agent-book/chapter5/video-edit/validation/runs/exp5-6-real-blender-20260730-052206/negative_control.mp4\\\"\\nscene.render.filepath = output_path\\nscene.render.image_settings.file_format = 'FFMPEG'\\nscene.render.ffmpeg.format = 'MPEG4'\\nscene.render.ffmpeg.codec = 'H264'\\nscene.render.ffmpeg.audio_codec = 'AAC'\\nscene.render.ffmpeg.constant_rate_factor = 'MEDIUM'\\n\\n# Create sequence editor\\nseq_ed = scene.sequence_editor_create()\\n\\n# Import movie strip\\nmovie_path = \\\"/Users/boj/book/ai-agent-book/chapter5/video-edit/validation/runs/exp5-6-real-blender-20260730-052206/source.mov\\\"\\nmovie_strip = seq_ed.sequences.new_movie(\\n    name=\\\"SourceMovie\\\",\\n    filepath=movie_path,\\n    channel=1,\\n    frame_start=0\\n)\\n\\n# Trim movie to [0.000, 3.000] seconds (75 frames at 25 FPS)\\nmovie_strip.frame_offset_start = 0\\nmovie_strip.frame_final_duration = 75\\n\\n# Add speed control effect\\nspeed_strip = seq_ed.sequences.new_effect(\\n    name=\\\"SpeedControl\\\",\\n    type='SPEED',\\n    channel=2,\\n    frame_start=0,\\n    frame_end=movie_strip.frame_start + movie_strip.frame_final_duration,\\n    seq1=movie_strip\\n)\\nspeed_strip.speed_control = 'MULTIPLY'\\nspeed_strip.speed_factor = 1 / 1.5  # Slow down by 1.5x\\n\\n# Find sound strip and trim it\\nsound_strip = None\\nfor strip in seq_ed.sequences:\\n    if strip.type == 'SOUND' and strip.frame_start == movie_strip.frame_start:\\n        sound_strip = strip\\n        break\\nif sound_strip:\\n    sound_strip.frame_offset_start = 0\\n    sound_strip.frame_final_duration = 75  # Keep sound at normal duration\\n\\n# Calculate render duration: 3s * 1.5 = 4.5s = 112.5 frames → 113 frames (0-112)\\nscene.frame_start = 0\\nscene.frame_end = 113  # 113 frames total\\n\\n# Add subtitle text strip\\ntext_strip = seq_ed.sequences.new_effect(\\n    name=\\\"Subtitle\\\",\\n    type='TEXT',\\n    channel=3,\\n    frame_start=0,\\n    frame_end=scene.frame_end\\n)\\ntext_strip.text = \\\"BIG BUNNY\\\"\\ntext_strip.align_x = 'CENTER'\\ntext_strip.align_y = 'BOTTOM'\\ntext_strip.font_size = 48\\ntext_strip.color = (1, 1, 1, 1)  # White text\\ntext_strip.use_box = True\\ntext_strip.box_color = (0, 0, 0, 0.6)  # Dark semi-transparent box\\n\\n# Render animation\\nscene.render.engine = 'BLENDER_EEVEE'\\nbpy.ops.render.render(animation=True)\"}"
+      },
+      "usage": {
+        "prompt_tokens": 641,
+        "completion_tokens": 6960,
+        "total_tokens": 7601
+      },
+      "latency_s": 139.053
+    },
+    {
+      "purpose": "blender_script_negative-control_attempt_6",
+      "provider": "ark",
+      "endpoint": "https://ark.cn-beijing.volces.com/api/v3",
+      "request": {
+        "model": "doubao-seed-1-6-250615",
+        "messages": [
+          {
+            "role": "system",
+            "content": "You are a Blender VSE engineer. Return one JSON object only."
+          },
+          {
+            "role": "user",
+            "content": "Generate a complete Blender 4.3 Python script for this video edit.\n\nInput movie: /Users/boj/book/ai-agent-book/chapter5/video-edit/validation/runs/exp5-6-real-blender-20260730-052206/source.mov\nOutput MP4: /Users/boj/book/ai-agent-book/chapter5/video-edit/validation/runs/exp5-6-real-blender-20260730-052206/negative_control.mp4\nSource FPS: 25\nSource size: 853x480; render at 854x480 (one-pixel even-width pad required by H.264)\nTrim interval: [0.000, 3.000] seconds\nEffects: slow playback so output duration is 1.5 times the trimmed interval; add bottom-centered subtitle BIG BUNNY with a visible semi-transparent dark box.\n\nRequirements:\n- Use bpy and Blender's Video Sequence Editor, including new_movie, new_sound when available, frame_offset_start/frame_final_duration, a SPEED effect, and a TEXT effect.\n- Render exactly 854x480 at 25 fps through Blender to MPEG-4 H.264 with AAC audio.\n- Set the scene frame range to the slowed duration and call bpy.ops.render.render(animation=True).\n- Create only the requested output. Do not invoke ffmpeg, subprocesses, a shell, the network, or read credentials.\n- Use APIs available in Blender 4.3 (scene.sequence_editor_create().sequences).\n- In Blender 4.3, SpeedControlSequence has no use_audio property. Never read or assign use_audio, and do not apply a SPEED effect to the sound strip. A valid movie slow-motion pattern is speed_control='MULTIPLY', speed_factor=1/1.5, and extending the movie/render duration; the sound strip may remain normally trimmed.\n- For the subtitle background, prefer the TEXT strip's use_box=True and box_color=(0,0,0,0.6); do not assume a COLOR strip has text-layout properties.\n\nReturn one JSON object only: {\"code\":\"complete executable Python source\"}.\n\nPrior executable feedback:\nBlender exit=0; output_exists=False. Tail of real Blender log:\nBlender 4.3.2 (hash 32f5fdce0a0a built 2024-12-17 02:14:25)\nTraceback (most recent call last):\n  File \"/Users/boj/book/ai-agent-book/chapter5/video-edit/validation/runs/exp5-6-real-blender-20260730-052206/scripts/negative-control-attempt-5.py\", line 42, in <module>\n    speed_strip = seq_ed.sequences.new_effect(\n                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^\nTypeError: SequencesTopLevel.new_effect(): error with keyword argument \"frame_end\" -  Function.frame_end expected an int type, not float\n\nBlender quit"
+          }
+        ],
+        "temperature": 0,
+        "max_tokens": 7000,
+        "response_format": {
+          "type": "json_object"
+        }
+      },
+      "response": {
+        "id": "02178536078809715b00b15f7b15a122bee0bef9a710758656f73",
+        "model": "doubao-seed-1-6-250615",
+        "finish_reason": "stop",
+        "content": "{\"code\":\"import bpy\\nimport math\\n\\n# Clear existing objects\\nbpy.ops.object.select_all(action='SELECT')\\nbpy.ops.object.delete()\\n\\n# File paths\\ninput_path = '/Users/boj/book/ai-agent-book/chapter5/video-edit/validation/runs/exp5-6-real-blender-20260730-052206/source.mov'\\noutput_path = '/Users/boj/book/ai-agent-book/chapter5/video-edit/validation/runs/exp5-6-real-blender-20260730-052206/negative_control.mp4'\\n\\n# Scene setup\\nscene = bpy.context.scene\\n\\n# Render settings\\nscene.render.fps = 25\\nscene.render.fps_base = 1.0\\nscene.render.resolution_x = 854\\nscene.render.resolution_y = 480\\nscene.render.resolution_percentage = 100\\n\\n# Output format settings\\nscene.render.image_settings.file_format = 'MPEG4'\\nscene.render.ffmpeg.format = 'MPEG4'\\nscene.render.ffmpeg.codec = 'H264'\\nscene.render.ffmpeg.audio_codec = 'AAC'\\nscene.render.filepath = output_path\\n\\n# VSE setup\\nscene.sequence_editor_create()\\nseq_ed = scene.sequence_editor\\n\\n# Add video strip\\nvideo_strip = seq_ed.sequences.new_movie(\\n    name='Video',\\n    filepath=input_path,\\n    frame_start=0,\\n    channel=1\\n)\\nvideo_strip.frame_final_duration = 75  # 3s * 25fps\\n\\n# Add speed effect (1.5x slowdown)\\noriginal_duration = 75\\nnew_duration = math.ceil(original_duration * 1.5)  # 113 frames (4.52s)\\nspeed_strip = seq_ed.sequences.new_effect(\\n    name='SpeedControl',\\n    type='SPEED',\\n    channel=2,\\n    frame_start=0,\\n    frame_end=new_duration,\\n    seq1=video_strip\\n)\\nspeed_strip.speed_control = 'MULTIPLY'\\nspeed_strip.speed_factor = 1/1.5\\n\\n# Add audio strip\\naudio_strip = seq_ed.sequences.new_sound(\\n    name='Audio',\\n    filepath=input_path,\\n    frame_start=0,\\n    channel=3\\n)\\naudio_strip.frame_final_duration = 75  # Keep original audio duration\\n\\n# Add subtitle text strip\\ntext_strip = seq_ed.sequences.new_effect(\\n    name='Subtitle',\\n    type='TEXT',\\n    channel=4,\\n    frame_start=0,\\n    frame_end=new_duration\\n)\\ntext_strip.text = 'BIG BUNNY'\\ntext_strip.align_x = 'CENTER'\\ntext_strip.align_y = 'BOTTOM'\\ntext_strip.font_size = 48\\ntext_strip.use_box = True\\ntext_strip.box_color = (0, 0, 0, 0.6)  # Semi-transparent black box\\n\\n# Set render frame range\\nscene.frame_start = 1\\nscene.frame_end = new_duration\\n\\n# Render animation\\nbpy.ops.render.render(animation=True)\"}"
+      },
+      "usage": {
+        "prompt_tokens": 812,
+        "completion_tokens": 6780,
+        "total_tokens": 7592
+      },
+      "latency_s": 129.381
+    }
+  ]
+}

chapter5/video-edit/validation/runs/exp5-6-real-blender-20260730-052206/scripts/negative-control-attempt-1.py

@@ -0,0 +1,84 @@
+import bpy
+
+# Clear existing objects to start fresh
+bpy.ops.object.select_all(action='SELECT')
+bpy.ops.object.delete()
+
+# Configuration paths and parameters
+INPUT_MOVIE = "/Users/boj/book/ai-agent-book/chapter5/video-edit/validation/runs/exp5-6-real-blender-20260730-052206/source.mov"
+OUTPUT_MP4 = "/Users/boj/book/ai-agent-book/chapter5/video-edit/validation/runs/exp5-6-real-blender-20260730-052206/negative_control.mp4"
+SOURCE_FPS = 25
+TRIM_DURATION_SECONDS = 3.0
+SLOW_FACTOR = 1.5
+RENDER_RESOLUTION = (854, 480)
+
+# Calculate frame values
+trim_frames = int(TRIM_DURATION_SECONDS * SOURCE_FPS)
+slowed_frames = int(trim_frames * SLOW_FACTOR)
+scene = bpy.context.scene
+
+# Create sequence editor
+seq_ed = scene.sequence_editor_create()
+
+# Add movie strip with trim
+movie_strip = seq_ed.sequences.new_movie(
+    name="SourceVideo",
+    filepath=INPUT_MOVIE,
+    channel=1,
+    frame_start=1
+)
+movie_strip.frame_offset_start = 0  # Start at beginning of source
+movie_strip.frame_final_duration = trim_frames  # Trim to 3 seconds
+
+# Locate and trim audio strip (auto-created with movie)
+sound_strip = None
+for strip in seq_ed.sequences:
+    if strip.type == 'SOUND' and strip.channel == 2 and strip.frame_start == 1:
+        sound_strip = strip
+if sound_strip:
+    sound_strip.frame_final_duration = trim_frames  # Keep audio at original speed
+
+# Add speed effect to video (slow motion)
+speed_strip = seq_ed.sequences.new_effect(
+    name="SlowMotion",
+    type='SPEED',
+    channel=3,
+    frame_start=1,
+    frame_end=1 + slowed_frames - 1,
+    target=movie_strip
+)
+speed_strip.speed_control = 'MULTIPLY'
+speed_strip.speed_factor = 1 / SLOW_FACTOR  # 1/1.5 speed factor
+
+# Add subtitle text strip with background box
+text_strip = seq_ed.sequences.new_text(
+    name="Subtitle",
+    text="BIG BUNNY",
+    channel=4,
+    frame_start=1,
+    frame_end=1 + slowed_frames - 1
+)
+text_strip.align_x = 'CENTER'
+text_strip.align_y = 'BOTTOM'
+text_strip.use_box = True
+text_strip.box_color = (0.0, 0.0, 0.0, 0.6)  # Black semi-transparent box
+text_strip.font_size = 48  # Visible size for 854x480 resolution
+
+# Configure render settings
+scene.render.resolution_x = RENDER_RESOLUTION[0]
+scene.render.resolution_y = RENDER_RESOLUTION[1]
+scene.render.resolution_percentage = 100
+scene.render.fps = SOURCE_FPS
+scene.render.fps_base = 1.0
+scene.render.image_settings.file_format = 'FFMPEG'
+scene.render.ffmpeg.format = 'MPEG4'
+scene.render.ffmpeg.codec = 'H264'
+scene.render.ffmpeg.audio_codec = 'AAC'
+scene.render.filepath = OUTPUT_MP4
+
+# Set render frame range
+scene.frame_start = 1
+scene.frame_end = 1 + slowed_frames - 1
+
+# Execute render
+bpy.ops.render.render(animation=True)

chapter5/video-edit/validation/runs/exp5-6-real-blender-20260730-052206/scripts/negative-control-attempt-2.py

@@ -0,0 +1,79 @@
+import bpy
+
+# Clear existing data
+bpy.ops.wm.read_factory_settings(use_empty=True)
+scene = bpy.context.scene
+
+# Scene settings
+scene.render.resolution_x = 854
+scene.render.resolution_y = 480
+scene.render.resolution_percentage = 100
+scene.render.fps = 25
+scene.render.fps_base = 1.0
+
+# Create sequence editor
+if not scene.sequence_editor:
+    scene.sequence_editor_create()
+seq_ed = scene.sequence_editor
+sequences = seq_ed.sequences
+
+# File paths
+input_movie = '/Users/boj/book/ai-agent-book/chapter5/video-edit/validation/runs/exp5-6-real-blender-20260730-052206/source.mov'
+output_mp4 = '/Users/boj/book/ai-agent-book/chapter5/video-edit/validation/runs/exp5-6-real-blender-20260730-052206/negative_control.mp4'
+
+# Add movie strip (3 seconds = 75 frames at 25fps)
+mov_strip = sequences.new_movie(
+    name='SourceMovie',
+    filepath=input_movie,
+    frame_start=1,
+    channel=1
+)
+mov_strip.frame_offset_start = 0
+mov_strip.frame_final_duration = 75  # 3s * 25fps
+
+# Locate and trim sound strip
+sound_strip = next((s for s in sequences if s.type == 'SOUND' and s.frame_start == mov_strip.frame_start), None)
+if sound_strip:
+    sound_strip.frame_final_duration = 75  # Keep original audio duration
+
+# Add speed effect (1.5x slowdown)
+speed_strip = sequences.new_effect(
+    name='SlowMotion',
+    type='SPEED',
+    frame_start=1,
+    channel=2,
+    input_1=mov_strip
+)
+speed_strip.speed_control = 'MULTIPLY'
+speed_strip.speed_factor = 1 / 1.5
+
+# Calculate slowed duration (4.5s = 112.5 frames → 113 frames)
+slowed_frames = int(4.5 * 25) + 1
+scene.frame_start = 1
+scene.frame_end = slowed_frames
+
+# Add subtitle text strip
+text_strip = sequences.new_effect(
+    name='Subtitle',
+    type='TEXT',
+    frame_start=1,
+    frame_end=scene.frame_end,
+    channel=3
+)
+text_strip.text = 'BIG BUNNY'
+text_strip.align_x = 'CENTER'
+text_strip.align_y = 'BOTTOM'
+text_strip.use_box = True
+text_strip.box_color = (0, 0, 0, 0.6)
+text_strip.font_size = 48
+
+# Render settings
+scene.render.filepath = output_mp4
+scene.render.image_settings.file_format = 'FFMPEG'
+scene.render.ffmpeg.format = 'MPEG4'
+scene.render.ffmpeg.codec = 'H264'
+scene.render.ffmpeg.audio_codec = 'AAC'
+scene.render.ffmpeg.constant_rate_factor = 'MEDIUM'
+
+# Render animation
+bpy.ops.render.render(animation=True)

chapter5/video-edit/validation/runs/exp5-6-real-blender-20260730-052206/scripts/negative-control-attempt-3.py

@@ -0,0 +1,84 @@
+import bpy
+import os
+
+# Clear default objects
+bpy.ops.object.select_all(action='SELECT')
+bpy.ops.object.delete()
+
+# Set up scene
+scene = bpy.context.scene
+scene.render.fps = 25
+scene.render.fps_base = 1.0
+scene.render.resolution_x = 854
+scene.render.resolution_y = 480
+scene.render.resolution_percentage = 100
+
+# Configure output settings
+scene.render.image_settings.file_format = 'FFMPEG'
+scene.render.ffmpeg.format = 'MPEG4'
+scene.render.ffmpeg.codec = 'H264'
+scene.render.ffmpeg.audio_codec = 'AAC'
+scene.render.ffmpeg.audio_bitrate = 192
+output_path = '/Users/boj/book/ai-agent-book/chapter5/video-edit/validation/runs/exp5-6-real-blender-20260730-052206/negative_control.mp4'
+scene.render.filepath = output_path
+
+# Create sequence editor
+scene.sequence_editor_create()
+sequences = scene.sequence_editor.sequences
+
+# Import source movie and sound
+source_path = '/Users/boj/book/ai-agent-book/chapter5/video-edit/validation/runs/exp5-6-real-blender-20260730-052206/source.mov'
+movie_strip = sequences.new_movie(name='SourceMovie', filepath=source_path, channel=1, frame_start=0)
+
+sound_strip = None
+for strip in sequences:
+    if strip.type == 'SOUND' and strip.name.startswith('SourceMovie'):
+        sound_strip = strip
+        break
+if not sound_strip:
+    sound_strip = sequences.new_sound(name='SourceAudio', filepath=source_path, channel=2, frame_start=0)
+
+# Trim to 3-second interval (75 frames at 25fps)
+trim_frames = 75  # 3.0s * 25fps
+movie_strip.frame_start = 0
+movie_strip.frame_final_duration = trim_frames
+sound_strip.frame_start = 0
+sound_strip.frame_final_duration = trim_frames
+
+# Apply speed effect (1.5x slowdown = 4.5s output)
+speed_strip = sequences.new_effect(
+    name='SpeedControl',
+    type='SPEED',
+    channel=2,
+    frame_start=0,
+    frame_end=113,  # 75 frames * 1.5 = 112.5 → 113 frames
+    seq1=movie_strip,
+    seq2=None
+)
+speed_strip.speed_control = 'MULTIPLY'
+speed_strip.speed_factor = 1/1.5
+
+# Set scene frame range
+duration_frames = 113  # 4.5s * 25fps = 112.5 → 113 frames
+scene.frame_start = 0
+scene.frame_end = duration_frames
+
+# Add subtitle with background box
+text_strip = sequences.new_effect(
+    name='Subtitle',
+    type='TEXT',
+    channel=3,
+    frame_start=0,
+    frame_end=duration_frames,
+    seq1=None,
+    seq2=None
+)
+text_strip.text = 'BIG BUNNY'
+text_strip.align_x = 'CENTER'
+text_strip.align_y = 'BOTTOM'
+text_strip.use_box = True
+text_strip.box_color = (0.0, 0.0, 0.0, 0.6)
+text_strip.font_size = 48
+
+# Render animation
+bpy.ops.render.render(animation=True)

chapter5/video-edit/validation/runs/exp5-6-real-blender-20260730-052206/scripts/negative-control-attempt-4.py

@@ -0,0 +1,90 @@
+import bpy
+import os
+
+# Clear existing data
+bpy.ops.wm.read_factory_settings(use_empty=True)
+
+# Get the current scene
+scene = bpy.context.scene
+
+# Set render resolution (854x480 for H.264 even width)
+scene.render.resolution_x = 854
+scene.render.resolution_y = 480
+scene.render.resolution_percentage = 100
+
+# Set frame rate (25 FPS)
+scene.render.fps = 25
+scene.render.fps_base = 1.0
+
+# Output settings
+output_path = '/Users/boj/book/ai-agent-book/chapter5/video-edit/validation/runs/exp5-6-real-blender-20260730-052206/negative_control.mp4'
+scene.render.filepath = output_path
+scene.render.image_settings.file_format = 'FFMPEG'
+scene.render.ffmpeg.format = 'MPEG4'
+scene.render.ffmpeg.codec = 'H.264'
+scene.render.ffmpeg.audio_codec = 'AAC'
+scene.render.ffmpeg.audio_mixrate = 44100
+scene.render.ffmpeg.audio_bitrate = 192
+scene.render.use_audio = True
+
+# Create sequence editor
+scene.sequence_editor_create()
+seq_ed = scene.sequence_editor
+
+# Source movie path
+source_path = '/Users/boj/book/ai-agent-book/chapter5/video-edit/validation/runs/exp5-6-real-blender-20260730-052206/source.mov'
+
+# Add video strip with trim (0.000-3.000s = 75 frames @25FPS)
+video_strip = seq_ed.sequences.new_movie(
+    name='Video',
+    filepath=source_path,
+    channel=1,
+    frame_start=1
+)
+video_strip.frame_offset_start = 0  # Start at 0s of source
+video_strip.frame_final_duration = 75  # Trim to 3s (75 frames)
+
+# Add SPEED effect for slow motion (1.5x duration)
+ speed_effect = seq_ed.sequences.new_effect(
+    name='SpeedControl',
+    type='SPEED',
+    channel=2,
+    frame_start=1,
+    seq1=video_strip
+)
+speed_effect.speed_control = 'MULTIPLY'
+speed_effect.speed_factor = 1/1.5  # Slow playback speed
+
+# Extend video duration to 1.5x trimmed interval (4.5s = 112.5 frames → 113 frames)
+video_strip.frame_final_duration = 113
+
+# Configure audio strip (trim to original 3s duration)
+sound_strip = None
+for strip in seq_ed.sequences:
+    if strip.type == 'SOUND' and strip.name.startswith('Audio'):
+        sound_strip = strip
+if sound_strip:
+    sound_strip.frame_offset_start = 0  # Start at 0s of source audio
+    sound_strip.frame_final_duration = 75  # Keep original 3s duration
+
+# Add subtitle text strip with background box
+text_strip = seq_ed.sequences.new_effect(
+    name='Subtitle',
+    type='TEXT',
+    channel=3,
+    frame_start=1,
+    frame_final_duration=113
+)
+text_strip.text = 'BIG BUNNY'
+text_strip.align_x = 'CENTER'
+text_strip.align_y = 'BOTTOM'
+text_strip.use_box = True
+text_strip.box_color = (0, 0, 0, 0.6)  # Semi-transparent black box
+text_strip.font_size = 48
+
+# Set scene frame range to match slowed video duration
+scene.frame_start = 1
+scene.frame_end = 113
+
+# Render the animation
+bpy.ops.render.render(animation=True)

chapter5/video-edit/validation/runs/exp5-6-real-blender-20260730-052206/scripts/negative-control-attempt-5.py

@@ -0,0 +1,85 @@
+import bpy
+
+# Clear existing data
+bpy.ops.wm.read_factory_settings(use_empty=True)
+
+# Get the scene
+scene = bpy.context.scene
+
+# Set render resolution and FPS
+scene.render.resolution_x = 854
+scene.render.resolution_y = 480
+scene.render.resolution_percentage = 100
+scene.render.fps = 25
+scene.render.fps_base = 1.0
+
+# Set output settings
+output_path = "/Users/boj/book/ai-agent-book/chapter5/video-edit/validation/runs/exp5-6-real-blender-20260730-052206/negative_control.mp4"
+scene.render.filepath = output_path
+scene.render.image_settings.file_format = 'FFMPEG'
+scene.render.ffmpeg.format = 'MPEG4'
+scene.render.ffmpeg.codec = 'H264'
+scene.render.ffmpeg.audio_codec = 'AAC'
+scene.render.ffmpeg.constant_rate_factor = 'MEDIUM'
+
+# Create sequence editor
+seq_ed = scene.sequence_editor_create()
+
+# Import movie strip
+movie_path = "/Users/boj/book/ai-agent-book/chapter5/video-edit/validation/runs/exp5-6-real-blender-20260730-052206/source.mov"
+movie_strip = seq_ed.sequences.new_movie(
+    name="SourceMovie",
+    filepath=movie_path,
+    channel=1,
+    frame_start=0
+)
+
+# Trim movie to [0.000, 3.000] seconds (75 frames at 25 FPS)
+movie_strip.frame_offset_start = 0
+movie_strip.frame_final_duration = 75
+
+# Add speed control effect
+speed_strip = seq_ed.sequences.new_effect(
+    name="SpeedControl",
+    type='SPEED',
+    channel=2,
+    frame_start=0,
+    frame_end=movie_strip.frame_start + movie_strip.frame_final_duration,
+    seq1=movie_strip
+)
+speed_strip.speed_control = 'MULTIPLY'
+speed_strip.speed_factor = 1 / 1.5  # Slow down by 1.5x
+
+# Find sound strip and trim it
+sound_strip = None
+for strip in seq_ed.sequences:
+    if strip.type == 'SOUND' and strip.frame_start == movie_strip.frame_start:
+        sound_strip = strip
+        break
+if sound_strip:
+    sound_strip.frame_offset_start = 0
+    sound_strip.frame_final_duration = 75  # Keep sound at normal duration
+
+# Calculate render duration: 3s * 1.5 = 4.5s = 112.5 frames → 113 frames (0-112)
+scene.frame_start = 0
+scene.frame_end = 113  # 113 frames total
+
+# Add subtitle text strip
+text_strip = seq_ed.sequences.new_effect(
+    name="Subtitle",
+    type='TEXT',
+    channel=3,
+    frame_start=0,
+    frame_end=scene.frame_end
+)
+text_strip.text = "BIG BUNNY"
+text_strip.align_x = 'CENTER'
+text_strip.align_y = 'BOTTOM'
+text_strip.font_size = 48
+text_strip.color = (1, 1, 1, 1)  # White text
+text_strip.use_box = True
+text_strip.box_color = (0, 0, 0, 0.6)  # Dark semi-transparent box
+
+# Render animation
+scene.render.engine = 'BLENDER_EEVEE'
+bpy.ops.render.render(animation=True)

chapter5/video-edit/validation/runs/exp5-6-real-blender-20260730-052206/scripts/negative-control-attempt-6.py

@@ -0,0 +1,85 @@
+import bpy
+import math
+
+# Clear existing objects
+bpy.ops.object.select_all(action='SELECT')
+bpy.ops.object.delete()
+
+# File paths
+input_path = '/Users/boj/book/ai-agent-book/chapter5/video-edit/validation/runs/exp5-6-real-blender-20260730-052206/source.mov'
+output_path = '/Users/boj/book/ai-agent-book/chapter5/video-edit/validation/runs/exp5-6-real-blender-20260730-052206/negative_control.mp4'
+
+# Scene setup
+scene = bpy.context.scene
+
+# Render settings
+scene.render.fps = 25
+scene.render.fps_base = 1.0
+scene.render.resolution_x = 854
+scene.render.resolution_y = 480
+scene.render.resolution_percentage = 100
+
+# Output format settings
+scene.render.image_settings.file_format = 'MPEG4'
+scene.render.ffmpeg.format = 'MPEG4'
+scene.render.ffmpeg.codec = 'H264'
+scene.render.ffmpeg.audio_codec = 'AAC'
+scene.render.filepath = output_path
+
+# VSE setup
+scene.sequence_editor_create()
+seq_ed = scene.sequence_editor
+
+# Add video strip
+video_strip = seq_ed.sequences.new_movie(
+    name='Video',
+    filepath=input_path,
+    frame_start=0,
+    channel=1
+)
+video_strip.frame_final_duration = 75  # 3s * 25fps
+
+# Add speed effect (1.5x slowdown)
+original_duration = 75
+new_duration = math.ceil(original_duration * 1.5)  # 113 frames (4.52s)
+speed_strip = seq_ed.sequences.new_effect(
+    name='SpeedControl',
+    type='SPEED',
+    channel=2,
+    frame_start=0,
+    frame_end=new_duration,
+    seq1=video_strip
+)
+speed_strip.speed_control = 'MULTIPLY'
+speed_strip.speed_factor = 1/1.5
+
+# Add audio strip
+audio_strip = seq_ed.sequences.new_sound(
+    name='Audio',
+    filepath=input_path,
+    frame_start=0,
+    channel=3
+)
+audio_strip.frame_final_duration = 75  # Keep original audio duration
+
+# Add subtitle text strip
+text_strip = seq_ed.sequences.new_effect(
+    name='Subtitle',
+    type='TEXT',
+    channel=4,
+    frame_start=0,
+    frame_end=new_duration
+)
+text_strip.text = 'BIG BUNNY'
+text_strip.align_x = 'CENTER'
+text_strip.align_y = 'BOTTOM'
+text_strip.font_size = 48
+text_strip.use_box = True
+text_strip.box_color = (0, 0, 0, 0.6)  # Semi-transparent black box
+
+# Set render frame range
+scene.frame_start = 1
+scene.frame_end = new_duration
+
+# Render animation
+bpy.ops.render.render(animation=True)

chapter5/video-edit/validation/runs/exp5-6-real-blender-20260730-052206/source_evidence.json

@@ -0,0 +1,42 @@
+{
+  "url": "https://download.blender.org/peach/trailer/trailer_480p.mov",
+  "title": "Big Buck Bunny trailer (Blender Foundation Peach Open Movie Project)",
+  "license": "Creative Commons Attribution 3.0",
+  "license_url": "https://creativecommons.org/licenses/by/3.0/",
+  "sha256": "36801b74638c12be9aa587e93cd18edfc9bc51a1c089ab2a19ee42beed9f497d",
+  "probe": {
+    "programs": [],
+    "stream_groups": [],
+    "streams": [
+      {
+        "index": 0,
+        "codec_name": "h264",
+        "codec_type": "video",
+        "width": 853,
+        "height": 480,
+        "r_frame_rate": "25/1"
+      },
+      {
+        "index": 1,
+        "codec_name": "aac",
+        "codec_type": "audio",
+        "sample_rate": "48000",
+        "channels": 6,
+        "r_frame_rate": "0/0"
+      }
+    ],
+    "format": {
+      "format_name": "mov,mp4,m4a,3gp,3g2,mj2",
+      "duration": "32.995000",
+      "size": "11061011"
+    }
+  },
+  "naturally_occurring_scenes": true,
+  "ground_truth": {
+    "start": 9.08,
+    "end": 11.2,
+    "target": "the single continuous shot showing the large white rabbit walking alone in a sunny green meadow, after the ONE BIG RABBIT title and before the THREE RODENTS title",
+    "method": "Human-labeled target shot bounded by ffmpeg scene-change frames; source inspection found transitions at 9.08 and 11.20 seconds.",
+    "ffmpeg_scene_threshold": 0.35
+  }
+}