Open a terminal/command prompt where your video file is located. Run:
ffmpeg -i ipx-468.mkv -ss 01:57:33 -c copy -avoid_negative_ts make_zero ipx-468-cut.mkv
Explanation of flags:
Result: A new file that starts exactly at 01:57:33. This is the "top" (new beginning) of your clip. The original audio and subtitle tracks are preserved.
IPX is a professional container format. FFmpeg supports it only if compiled with libipx. Check compatibility: ipx468engsub convert015733 min top
ffmpeg -i ipx468engsub.ipx # Confirm decoding support
If supported, embed English subtitles (subtitle.srt):
ffmpeg -i ipx468engsub.ipx -vf "subtitles=subtitle.srt" -c:a copy output.mp4
If the user's intent was to convert the codec (e.g., from AVC to HEVC) starting at 01:57:33, use this two-pass FFmpeg command:
ffmpeg -ss 01:57:33 -i ipx-468.mkv -c:v libx265 -preset medium -crf 22 -c:a copy ipx-468-hevc.mp4
This extracts only the segment and re-encodes it to H.265. This is a true "convert." Open a terminal/command prompt where your video file
| Problem | Solution |
|---------|----------|
| Subtitles disappear after cutting | Use -map 0 -c:s copy to retain sub track. |
| Audio out of sync at 015733 | Add -copyts before -i to preserve timestamps. |
| File not found | Ensure filename matches exactly (case-sensitive). |
| ipx468engsub is a video stream URL | Use youtube-dl or ffmpeg -i "URL" first. |
| Symptom | Fix |
|---------|-----|
| Subtitles vanish after 01:57:33 | You forgot to split sync in Subtitle Edit – redo Step 1. |
| “Top” video looks stretched | Use stereo3d filter with tb (top-bottom) not ab (above-below). |
| Conversion fails at 01:57:33 | The source file is corrupt near that timestamp – trim 1 second before/after with -ss 01:57:32 -t 00:00:02 to skip the bad frame. |
Target Keyword: How to hardcode softcode subtitles IPX series Length: 1,500+ words Explanation of flags:
Outline:
Solution: Use -ss before -i for input seeking (as shown above). That’s keyframe-accurate. For frame-accurate cutting, use -ss after -i but you will need re-encoding:
ffmpeg -i ipx-468.mkv -ss 01:57:33 -c:v libx264 -c:a aac ipx-468-accurate.mp4