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