[Bug] Subtitle languages and labels not preserved, when Preserve subtitles option is checked in Advanced features

[ivan-yu]

When I select Preserve subtitles under Advanced features, after re-encode, all the subtitle languages and labels are gone.

Please see screenshots for original mkv and Shutter Encoder encoded mkv.

When there is a long list of different subtitle languges, it becomes impossible to select in the re-encoded file.

Thanks.

[ivan-yu]

I am running 64 bit Shutter Encoder on Windows 11

[ivan-yu]

Is this a bug in ffmpeg rather than Shutter Encoder?

[paulpacifico]

Sorry for the delay I was on holiday.

I don't know where the bug came from, I know it sometimes keep the subtitle language for some files. Could you please send me your file via WeTransfer for checking on my computer?

Thanks,
Paul.

[ivan-yu]

I deleted the originals after encoding. I suspect this "bug" happens to MKV containers

I just tried something different, I chose Extract function and extracted a random MKV file's subtitle, the srt filename doesn't have any language in it, does it mean the language is not retrieved at all during extract and insert?