no subtitles when converting to supported format

[taozi1996]

I think if the video file contain subtitle streams, the subtitles should be preserved when converting the video.
ffmpeg use
-map 0:s? -c:s copy

[mifi]

The problem is that not all formats support all subtitle codecs. So this is likely to cause the operation to fail. Doesnt subtitles show up in losslesscut after converting to supported format?

[taozi1996]

The problem is that not all formats support all subtitle codecs. So this is likely to cause the operation to fail. Doesnt subtitles show up in losslesscut after converting to supported format?

Now losslesscut convert to supported format and the format is Matroska.Matroska support most kinds of subtitle.

[mifi]

Not on macos (mp4). We could add a condition in the code, but what is the motivation for this feature request?

[taozi1996]

Not on macos (mp4). We could add a condition in the code, but what is the motivation for this feature request?

For subtitle viewing.

[mifi]

I just tested remuxing a video (mp4) with subtitle codec mov_text to mkv and it fails with:

Subtitle codec 94213 is not supported
Could not write header for output file #0 (incorrect codec parameters ?): Function not implemented

[taozi1996]

I just tested remuxing a video (mp4) with subtitle codec mov_text to mkv and it fails with:

Subtitle codec 94213 is not supported
Could not write header for output file #0 (incorrect codec parameters ?): Function not implemented

mov_text
can use
ffmpeg -i input.mp4 -map 0:v -c:v copy -map 0:a -c:a copy -map 0:s? -c:s srt -ignore_unknown output.mkv

[mifi]

True. could be combined with this issue: #418