id summary reporter owner description type status priority milestone component version severity resolution keywords cc mlocked 13211 MythTV needs a backport from FFmpeg 3.3/3.4 to make German DVB-T2 HD with 5.1 audio work Bjoern Voigt Peter Bennett "Broadcasts in German DVB T2 contain 2 channels (Stereo) or 6 channels (5.1 surround) audio. Especially cinema movies and shows often use 6 channels. Broadcasts with 2 channels work without problems in MythTV. But broadcasts with 6 audio channels cause sloppy sound, error messages and as a result also sloppy video playback. There are two log files with the error message for a sample video recording attached using the original MythTV version (fixes/29 branch). The root cause for this issue is, that MythTV uses FFmpeg 3.2, but the relevant bug was only fixed for FFmpeg 3.3, 3.4 or higher: Problem transcoding 5.1 AAC LATM audio streams https://trac.ffmpeg.org/ticket/4544 Unfortunately the patch in FFmpeg bug report 4544 itself is not sufficient. I had to backport some more changes from FFmpeg 3.3 to fix the problem. Since I am no FFmpeg developer and no export for AAC decoding I do not know, if the patch is minimal. My current version of the patch contains 499 lines for two FFmpeg files. I have tested the patched MythTV version on daily use. I have not found any issues. Some more attachments show playback logs for the patched version." Bug Report - General closed major 30.0 3rd Party - FFMPEG v29-fixes medium Fixed dvb, t2, hevc, latm, aac, ffmpeg 0