ffmpeg -i sone385.mkv -ss 120 -t 2 -c:v libx265 -crf 20 -preset medium -x265-params "aq-mode=3:no-sao=1" -c:a libopus -b:a 64k -movflags +faststart sone385_better_2sec.mp4
Before re-encoding the video, try "remuxing" it. Remuxing changes the container (e.g., from MKV to MP4) without re-encoding the actual video data. This fixes broken file indexes in seconds.
Download a free, open-source tool like or XMedia Recode . Load your sone385engsub file. Set the output format to MP4 or MKV.
| Tool | Best for | Platform | Learning curve | |------|----------|----------|----------------| | | Full subtitle conversion & timing | Windows, Linux (wine), macOS (wine) | Medium | | Aegisub | Advanced timing and styling (ASS) | Win, Mac, Linux | High | | FFmpeg + subtitle filter | Command‑line batch processing | All | High | | SubShifter (online) | Quick time shift by milliseconds | Browser | Low | | MKVToolNix | Splitting video & subtitle tracks together | All | Medium |
The perfect conversion doesn’t exist—but with the commands above, you can get than 99% of naive converters.
ffmpeg -i sone385.mkv -ss 120 -t 2 -c:v libx265 -crf 20 -preset medium -x265-params "aq-mode=3:no-sao=1" -c:a libopus -b:a 64k -movflags +faststart sone385_better_2sec.mp4
Before re-encoding the video, try "remuxing" it. Remuxing changes the container (e.g., from MKV to MP4) without re-encoding the actual video data. This fixes broken file indexes in seconds.
Download a free, open-source tool like or XMedia Recode . Load your sone385engsub file. Set the output format to MP4 or MKV.
| Tool | Best for | Platform | Learning curve | |------|----------|----------|----------------| | | Full subtitle conversion & timing | Windows, Linux (wine), macOS (wine) | Medium | | Aegisub | Advanced timing and styling (ASS) | Win, Mac, Linux | High | | FFmpeg + subtitle filter | Command‑line batch processing | All | High | | SubShifter (online) | Quick time shift by milliseconds | Browser | Low | | MKVToolNix | Splitting video & subtitle tracks together | All | Medium |
The perfect conversion doesn’t exist—but with the commands above, you can get than 99% of naive converters.