[FFmpeg-trac] #1726(undetermined:open): Mono TrueHD file no longer decodes (and was not lossless) (was: Mono TrueHD file fails to decode)

[FFmpeg]

#1726: Mono TrueHD file no longer decodes (and was not lossless)
-------------------------------------+-------------------------------------
             Reporter:  Carl Eugen   |                    Owner:  (none)
  Hoyos                              |
                 Type:  defect       |                   Status:  open
             Priority:  important    |                Component:
                                     |  undetermined
              Version:  git-master   |               Resolution:
             Keywords:  thd          |               Blocked By:
             Blocking:               |  Reproduced by developer:  1
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Changes (by Balling):

 * keywords:  thd regression mlp => thd
 * status:  reopened => open
 * summary:  Mono TrueHD file fails to decode => Mono TrueHD file no longer
     decodes (and was not lossless)

Comment:

 Actually it is technically not a regression because the original was not
 decoding correctly compared to Plex + EAE.exe anyway.

 Compare before regression (to extract mono channel losslessly):

 ffmpeg.exe -i https://samples.ffmpeg.org/ffmpeg-
 bugs/trac/ticket1726/Mono.thd -vn -c:a pcm_s24le -af
 channelmap=channel_layout=mono:map=0 fwefqaw.wav

 vs what plex gives: "C:\Program Files\Plex\Plex Media Server\Plex
 Transcoder.exe" -i https://samples.ffmpeg.org/ffmpeg-
 bugs/trac/ticket1726/Mono.thd -c:a pcm_s24le faefaw.wav

 So this is a bug in our decoder, since truehd is lossless.

 I will remove regression and mlp tags and attach Plex 24 bit flac
 (Mediaconcept EAE Dolby sdk).
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/1726#comment:7>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker