On Mon, Feb 21, 2022 at 5:07 PM Eran Kornblau <eran.kornb...@kaltura.com> wrote: > > Hi all, > > We've recently upgraded our ffmpeg version, and we got a playback issue on > some Sony TV models that are playing HBBTV/DASH+DRM - video plays fine, audio > doesn't play at all. > Listing here some of the affected models (not pasting all, the list is > long...) - KDL-32W600D, KDL-40W650D, KDL-48W650D, KDL-43W750D, KDL-49W750D, > KDL-55W650D. > > After some investigation, we found the cause was the addition of the 'btrt' > atom to the mp4 – > https://github.com/FFmpeg/FFmpeg/commit/3838e8fc210aa09a9f9058506c0ce80b6ad9b9c3 > The TV decoder expects to get the sinf atom right after esds, and doesn't > properly handle the btrt atom in between > (our packager adds the sinf atom at the end of the original stsd entry that > was read from the mp4 file). > > Since, in my understanding, the btrt atom was added mostly for reporting > reasons, IMHO, it should be a config option - off by default. > I would happily submit a patch for it, but sending this first, in case there > are any concerns/objections. >
In case the use case was unknown, the primary reason for adding this was to utilize this box to inform a media server of an incoming live stream's bit rate, since the overall bit rate cannot be calculated for something that isn't done yet (https://dashif-documents.azurewebsites.net/Ingest/master/DASH-IF-Ingest.html as an example of one such use case). This being an alternative to nonstandard things such as ISML manifests. Additionally, since it seemed to be specified at the end of the given structures, I added it at the end of these given boxes. Apparently thus it made your live patching of that box no longer compatible with these parsers, since you just append your required things to the end of it. Am I understanding things correctly? Jan _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
