Probably not very relevant right now but apparently Dolby pushed their new ac4 codec as part of new digital TV standart..<div><br></div><div>so.. it might be encountered in new broadcasts. </div><div><br></div><div>ffmpeg decoder was already written, but not in any release or even main tree</div><div><br></div><div>see</div><div><br></div><div><a href="https://trac.ffmpeg.org/ticket/8349">https://trac.ffmpeg.org/ticket/8349</a></div><div><br></div><div>and last comment pointing at recent-ish rebase</div><div><br></div><div><a href="https://github.com/makrsmark/FFmpeg/commits/ac4">https://github.com/makrsmark/FFmpeg/commits/ac4</a></div><div><br></div><div>if I understand correctly only mpeg transport stream currently supported as container, and not, say, mp4. </div>