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112 lines
3.2 KiB
Python
112 lines
3.2 KiB
Python
import bpy
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# Clear default objects
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bpy.ops.object.select_all(action='SELECT')
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bpy.ops.object.delete()
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# Set up scene and sequence editor
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scene = bpy.context.scene
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scene.sequence_editor = scene.sequence_editor_create()
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se = scene.sequence_editor
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# File paths
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input_path = '/Users/boj/book/ai-agent-book/chapter5/video-edit/validation/runs/exp5-6-real-blender-20260730-050817/source.mov'
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output_path = '/Users/boj/book/ai-agent-book/chapter5/video-edit/validation/runs/exp5-6-real-blender-20260730-050817/negative_control.mp4'
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# Video parameters
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source_fps = 25
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trim_start_sec = 0.0
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trim_end_sec = 3.0
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trim_duration_sec = trim_end_sec - trim_start_sec
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trim_duration_frames = int(trim_duration_sec * source_fps) # 75 frames
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output_duration_sec = trim_duration_sec * 1.5 # 4.5 seconds
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output_duration_frames = int(output_duration_sec * source_fps) # 113 frames (rounded up from 112.5)
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speed_factor = trim_duration_sec / output_duration_sec # 0.666...
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# Add video strip
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video_strip = se.sequences.new_movie(
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name='Video',
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filepath=input_path,
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channel=2,
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frame_start=1
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)
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video_strip.frame_offset_start = 0 # Start at 0s of source
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video_strip.frame_final_duration = trim_duration_frames # Trim to 3 seconds
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# Add audio strip
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audio_strip = se.sequences.new_sound(
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name='Audio',
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filepath=input_path,
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channel=1,
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frame_start=1
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)
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audio_strip.frame_offset_start = 0
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audio_strip.frame_final_duration = trim_duration_frames
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# Add speed effect to video
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speed_video = se.sequences.new_effect(
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name='Speed_Video',
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type='SPEED',
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channel=3,
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frame_start=1,
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seq1=video_strip
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)
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speed_video.speed_factor = speed_factor
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speed_video.frame_final_duration = output_duration_frames
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# Add speed effect to audio
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speed_audio = se.sequences.new_effect(
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name='Speed_Audio',
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type='SPEED',
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channel=2,
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frame_start=1,
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seq1=audio_strip
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)
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speed_audio.speed_factor = speed_factor
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speed_audio.frame_final_duration = output_duration_frames
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# Add subtitle text strip
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text_strip = se.sequences.new_effect(
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name='Subtitle',
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type='TEXT',
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channel=4,
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frame_start=1,
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frame_end=1 + output_duration_frames - 1
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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.font_size = 48
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text_strip.color = (1.0, 1.0, 1.0, 1.0) # White text
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# Subtitle background box
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text_strip.use_box = True
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text_strip.box_color = (0.0, 0.0, 0.0, 0.5) # Semi-transparent black
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text_strip.box_margin_left = 10
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text_strip.box_margin_right = 10
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text_strip.box_margin_top = 10
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text_strip.box_margin_bottom = 10
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# Render 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 = source_fps
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scene.render.fps_base = 1.0
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# Output format settings
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scene.render.image_settings.file_format = 'MPEG4'
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scene.render.ffmpeg.format = 'MPEG4'
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scene.render.ffmpeg.codec = 'H.264'
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scene.render.ffmpeg.audio_codec = 'AAC'
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scene.render.ffmpeg.audio_bitrate = 192
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scene.render.ffmpeg.constant_rate_factor = 'MEDIUM'
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scene.render.filepath = output_path
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# Set scene frame range
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scene.frame_start = 1
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scene.frame_end = output_duration_frames
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# Render animation
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bpy.ops.render.render(animation=True) |