Doa061engsub Convert020235 - Min
| Task | Tool | Why it’s suitable for massive files | |------|------|-------------------------------------| | | ffmpeg -i input.srt output.ass or mkvmerge --sub-charset 0:utf-8 -s 0 -o out.mkv video.mkv input.srt | FFmpeg streams line‑by‑line; mkvmerge can embed directly without re‑encoding video. | | Timestamp scaling / drift correction | ffsubsync video.mkv -i input.srt -o corrected.ass | Works on the whole video, uses audio‑based sync, can process > 100 h without loading everything into RAM. | | Batch splitting | split -l 5000000 subtitles.srt part_ (Linux) or Subtitle Edit → Batch conversion | Breaks a gigantic .srt into manageable chunks. | | Validation | subtitleeditor (Linux) or Subtitle Edit (Windows) → Check for overlapping lines, illegal timestamps | Quickly spot errors after conversion. | | Parallel processing | GNU parallel + ffmpeg / mkvmerge | Distribute per‑segment work across CPU cores or nodes. | | GPU‑accelerated encoding (if you also need to re‑encode video) | ffmpeg -hwaccel cuda -i … | Cuts transcoding time dramatically for huge files. |
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mkdir -p ass_chunks for f in part_*; do ffmpeg -hide_banner -loglevel error -i "$f" "ass_chunks/$f.ass" done | Task | Tool | Why it’s suitable
