Information about languages is not "lost", it was typically never in
those m2ts files. If you are interested in additional metadata, you
need to get it from the playlist files, which luckily libbluray also
reads for you, so its just a matter of calling the right API
functions.
Similar, chapter information is also available through the libbluray API.

- Hendrik

On Wed, Apr 8, 2020 at 12:19 PM Shaya Potter <spot...@gmail.com> wrote:
>
> when I read a title with libbluray, i get a nice m2ts (I believe) stream.  
> However, while this stream has all the video/audio/pg streams, it loses the 
> language associated with them (as part of juts the clip info I guess, not the 
> raw m2ts stream).
>
> Now, it seems that it is possible for this info to be part of the mpegts 
> stream (or at least I think), as ffmpeg can assign the metadata language to 
> it, but that just works now for audio streams as ffmpeg is known to not be 
> able to write hdmv_pgs streams to an mpegts container.
>
> Any chance libbluray could just append the language metadata itself (at least 
> if asked by the api user?).
>
> not as important (and perhaps less possible), but what about chapters?
>
> thanks.
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