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79 lines
2.2 KiB
Python
79 lines
2.2 KiB
Python
import bpy
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# Clear existing data
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bpy.ops.wm.read_factory_settings(use_empty=True)
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scene = bpy.context.scene
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# Scene settings
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scene.render.resolution_x = 854
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scene.render.resolution_y = 480
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scene.render.resolution_percentage = 100
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scene.render.fps = 25
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scene.render.fps_base = 1.0
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# Create sequence editor
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if not scene.sequence_editor:
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scene.sequence_editor_create()
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seq_ed = scene.sequence_editor
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sequences = seq_ed.sequences
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# File paths
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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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# Add movie strip (3 seconds = 75 frames at 25fps)
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mov_strip = sequences.new_movie(
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name='SourceMovie',
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filepath=input_movie,
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frame_start=1,
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channel=1
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)
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mov_strip.frame_offset_start = 0
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mov_strip.frame_final_duration = 75 # 3s * 25fps
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# Locate and trim sound strip
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sound_strip = next((s for s in sequences if s.type == 'SOUND' and s.frame_start == mov_strip.frame_start), None)
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if sound_strip:
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sound_strip.frame_final_duration = 75 # Keep original audio duration
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# Add speed effect (1.5x slowdown)
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speed_strip = sequences.new_effect(
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name='SlowMotion',
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type='SPEED',
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frame_start=1,
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channel=2,
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input_1=mov_strip
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)
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speed_strip.speed_control = 'MULTIPLY'
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speed_strip.speed_factor = 1 / 1.5
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# Calculate slowed duration (4.5s = 112.5 frames → 113 frames)
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slowed_frames = int(4.5 * 25) + 1
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scene.frame_start = 1
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scene.frame_end = slowed_frames
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# Add subtitle text strip
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text_strip = sequences.new_effect(
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name='Subtitle',
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type='TEXT',
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frame_start=1,
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frame_end=scene.frame_end,
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channel=3
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)
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text_strip.text = 'BIG BUNNY'
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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, 0.6)
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text_strip.font_size = 48
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# Render settings
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scene.render.filepath = output_mp4
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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.ffmpeg.constant_rate_factor = 'MEDIUM'
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# Render animation
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bpy.ops.render.render(animation=True) |