[FFmpeg-trac] #1149(undetermined:closed): wrong channels / poor playback for 7 channel dts

FFmpeg trac at avcodec.org
Sat Mar 31 11:40:21 CEST 2012

#1149: wrong channels / poor playback for 7 channel dts
             Reporter:  fro          |                    Owner:
                 Type:  defect       |                   Status:  closed
             Priority:  normal       |                Component:
              Version:  git-master   |  undetermined
             Keywords:  dts 6.1      |               Resolution:
             Blocking:               |  worksforme
Analyzed by developer:  0            |               Blocked By:
                                     |  Reproduced by developer:  0

Comment (by reimar):

 > ffplay -request_channels 2 out.wav sounds bad.
 -request_channels 2 has no effect on raw PCM. You'd have to specify
 downsampling manually.
 As Carl said you need to use -request_channels when converting to wav

 > I still can't get "good" output with any (Linux) player once ffmpeg
 processed it into any other format.

 That doesn't have anything to do with processing it into any other format
 but with processing it into a 7-channel format that will always end up as
 such in the play.
 7-channel audio seems to be broken in the sound system. PulseAudio (-ao
 pulse in MPlayer) right-out refuses to play such content at all, ALSA (-ao
 alsa) seems to play it but with different channel order (no idea whether
 it is MPlayer's or ALSA's fault).

Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1149#comment:5>
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