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fix: remove audio during intermediate processing and mux original audio back during final concatenation to prevent sync issues

This commit is contained in:
tigerenwork 2026-04-11 17:02:58 +08:00
parent d99da42a2e
commit 97a9c929c0
2 changed files with 29 additions and 16 deletions
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15
cut_head.py
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@ -58,25 +58,30 @@ def smart_cut(input_video, output_video, cut_timestamp):
try:
# 1. Re-encode the tiny segment (from exact cut to next keyframe)
# Audio is removed (-an) to prevent sync/overlap issues during concatenation
subprocess.run([
'ffmpeg', '-y', '-v', 'error', '-i', input_video,
'-ss', str(cut_timestamp), '-to', str(next_keyframe),
'-c:v', 'libx264', '-crf', '18', '-c:a', 'copy', part1
'-c:v', 'libx264', '-crf', '18', '-an', part1
], check=True)
# 2. Copy the rest of the video (from next keyframe to the end)
# Audio is removed (-an) here too
subprocess.run([
'ffmpeg', '-y', '-v', 'error', '-ss', str(next_keyframe), '-i', input_video,
'-c:v', 'copy', '-c:a', 'copy', part2
'-c:v', 'copy', '-an', part2
], check=True)
# 3. Concatenate them using a text list (Forced UTF-8 encoding for emojis/special chars)
# 3. Concatenate video parts and cleanly mux with the original extracted audio
with open(concat_list, 'w', encoding='utf-8') as f:
f.write(f"file '{part1}'\nfile '{part2}'\n")
subprocess.run([
'ffmpeg', '-y', '-v', 'error', '-f', 'concat', '-safe', '0',
'-i', concat_list, '-c', 'copy', output_video
'ffmpeg', '-y', '-v', 'error',
'-f', 'concat', '-safe', '0', '-i', concat_list,
'-ss', str(cut_timestamp), '-i', input_video,
'-map', '0:v', '-map', '1:a?',
'-c:v', 'copy', '-c:a', 'copy', output_video
], check=True)
print(f"Success! Saved to {output_video}")

18
cut_tail.py
View File

@ -71,31 +71,39 @@ def smart_cut_tail(input_video, output_video, tail_duration):
try:
# 3. Copy the bulk of the video (from 0 to the preceding keyframe)
# Audio is removed (-an) to prevent sync/overlap issues
if prev_keyframe > 0.0:
subprocess.run([
'ffmpeg', '-y', '-v', 'error', '-i', input_video,
'-t', str(prev_keyframe),
'-c:v', 'copy', '-c:a', 'copy', part1
'-c:v', 'copy', '-an', part1
], check=True)
# 4. Re-encode the tiny tip (from the preceding keyframe to the exact cut timestamp)
# Audio is removed (-an) here too
tiny_duration = cut_timestamp - prev_keyframe
if tiny_duration > 0.0:
subprocess.run([
'ffmpeg', '-y', '-v', 'error',
'-ss', str(prev_keyframe), '-i', input_video,
'-t', str(tiny_duration),
'-c:v', 'libx264', '-crf', '18', '-c:a', 'copy', part2
'-c:v', 'libx264', '-crf', '18', '-an', part2
], check=True)
# 5. Concatenate them using a text list (Forced UTF-8 encoding for emojis/special chars)
# 5. Concatenate video parts and cleanly mux with the original extracted audio
with open(concat_list, 'w', encoding='utf-8') as f:
if prev_keyframe > 0.0:
f.write(f"file '{part1}'\n")
if tiny_duration > 0.0:
f.write(f"file '{part2}'\n")
subprocess.run([
'ffmpeg', '-y', '-v', 'error', '-f', 'concat', '-safe', '0',
'-i', concat_list, '-c', 'copy', output_video
'ffmpeg', '-y', '-v', 'error',
'-f', 'concat', '-safe', '0', '-i', concat_list,
'-i', input_video,
'-map', '0:v', '-map', '1:a?',
'-c:v', 'copy', '-c:a', 'copy',
'-t', str(cut_timestamp), output_video
], check=True)
print(f"Success! Saved to {output_video}")