[gstreamer-bugs] [Bug 569916] New: DTS does not get downmixed to stereo correctly

Fri Jan 30 14:54:39 PST 2009

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  GStreamer | gst-plugins | Ver: 0.10.21
           Summary: DTS does not get downmixed to stereo correctly
           Product: GStreamer
           Version: 0.10.21
          Platform: Other
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: raffaele at sandrini.ch
         QAContact: gstreamer-bugs at lists.sourceforge.net
     GNOME version: 2.25/2.26
   GNOME milestone: Unspecified

The attached audio snipplet below contains an very small audio extract of a
movie, where you can hear a voice. The voice should be equally distributed on
both stereo channels. However, played on gstreamer the voice is louder on the
left channel than the right. Mplayer instead playes the snipplet (also using
libdca) perfectly well. I pasted the console output of gst-launch and mplayer
below. As you may see the ffdec_dca gstreamer plugin is used.

gst-launch output:

$ gst-launch -v filesrc location=dts-audio-snipplet.mkv ! decodebin !
audioconvert ! audioresample ! pulsesink 
Setting pipeline to PAUSED ...
/GstPipeline:pipeline0/GstDecodeBin:decodebin0/GstTypeFindElement:typefind.GstPad:src:
caps = video/x-matroska
Pipeline is PREROLLING ...
/GstPipeline:pipeline0/GstDecodeBin:decodebin0/GstQueue:queue0.GstPad:sink:
caps = audio/x-dts, channels=(int)6, rate=(int)48000
/GstPipeline:pipeline0/GstDecodeBin:decodebin0/GstQueue:queue0.GstPad:src: caps
= audio/x-dts, channels=(int)6, rate=(int)48000
/GstPipeline:pipeline0/GstDecodeBin:decodebin0/ffdec_dca:ffdec_dca0.GstPad:sink:
caps = audio/x-dts, channels=(int)6, rate=(int)48000
/GstPipeline:pipeline0/GstDecodeBin:decodebin0/ffdec_dca:ffdec_dca0.GstPad:src:
caps = audio/x-raw-int, rate=(int)48000, channels=(int)6, signed=(boolean)true,
endianness=(int)1234, width=(int)16, depth=(int)16

** (gst-launch-0.10:5630): WARNING **: Failed to retrieve channel layout from
caps. This usually means there is a GStreamer element that does not implement
multichannel audio correctly. Please file a bug.

** (gst-launch-0.10:5630): WARNING **: Failed to retrieve channel layout from
caps. This usually means there is a GStreamer element that does not implement
multichannel audio correctly. Please file a bug.
/GstPipeline:pipeline0/GstAudioConvert:audioconvert0.GstPad:src: caps =
audio/x-raw-int, rate=(int)48000, channels=(int)6, signed=(boolean)true,
endianness=(int)1234, width=(int)16, depth=(int)16
/GstPipeline:pipeline0/GstAudioConvert:audioconvert0.GstPad:sink: caps =
audio/x-raw-int, rate=(int)48000, channels=(int)6, signed=(boolean)true,
endianness=(int)1234, width=(int)16, depth=(int)16
/GstPipeline:pipeline0/GstDecodeBin:decodebin0.GstGhostPad:src0: caps =
audio/x-raw-int, rate=(int)48000, channels=(int)6, signed=(boolean)true,
endianness=(int)1234, width=(int)16, depth=(int)16
/GstPipeline:pipeline0/GstDecodeBin:decodebin0.GstGhostPad:src0.GstProxyPad:proxypad1:
caps = audio/x-raw-int, rate=(int)48000, channels=(int)6, signed=(boolean)true,
endianness=(int)1234, width=(int)16, depth=(int)16
/GstPipeline:pipeline0/GstAudioresample:audioresample0.GstPad:src: caps =
audio/x-raw-int, rate=(int)48000, channels=(int)6, signed=(boolean)true,
endianness=(int)1234, width=(int)16, depth=(int)16
/GstPipeline:pipeline0/GstAudioresample:audioresample0.GstPad:sink: caps =
audio/x-raw-int, rate=(int)48000, channels=(int)6, signed=(boolean)true,
endianness=(int)1234, width=(int)16, depth=(int)16

** (gst-launch-0.10:5630): WARNING **: Failed to retrieve channel layout from
caps. This usually means there is a GStreamer element that does not implement
multichannel audio correctly. Please file a bug.
/GstPipeline:pipeline0/GstPulseSink:pulsesink0.GstPad:sink: caps =
audio/x-raw-int, rate=(int)48000, channels=(int)6, signed=(boolean)true,
endianness=(int)1234, width=(int)16, depth=(int)16
Pipeline is PREROLLED ...
Setting pipeline to PLAYING ...
New clock: GstAudioSinkClock
Got EOS from element "pipeline0".
Execution ended after 6748637222 ns.
Setting pipeline to PAUSED ...
Setting pipeline to READY ...
/GstPipeline:pipeline0/GstPulseSink:pulsesink0.GstPad:sink: caps = NULL
/GstPipeline:pipeline0/GstAudioresample:audioresample0.GstPad:src: caps = NULL
/GstPipeline:pipeline0/GstAudioresample:audioresample0.GstPad:sink: caps = NULL
/GstPipeline:pipeline0/GstAudioConvert:audioconvert0.GstPad:src: caps = NULL
/GstPipeline:pipeline0/GstAudioConvert:audioconvert0.GstPad:sink: caps = NULL
/GstPipeline:pipeline0/GstDecodeBin:decodebin0.GstGhostPad:src0: caps = NULL
/GstPipeline:pipeline0/GstDecodeBin:decodebin0/ffdec_dca:ffdec_dca0.GstPad:src:
caps = NULL
/GstPipeline:pipeline0/GstDecodeBin:decodebin0/ffdec_dca:ffdec_dca0.GstPad:sink:
caps = NULL
/GstPipeline:pipeline0/GstDecodeBin:decodebin0/GstQueue:queue0.GstPad:src: caps
= NULL
/GstPipeline:pipeline0/GstDecodeBin:decodebin0/GstQueue:queue0.GstPad:sink:
caps = NULL
/GstPipeline:pipeline0/GstDecodeBin:decodebin0/GstMatroskaDemux:matroskademux0.GstPad:audio_00:
caps = NULL
/GstPipeline:pipeline0/GstDecodeBin:decodebin0/GstTypeFindElement:typefind.GstPad:src:
caps = NULL
Setting pipeline to NULL ...
FREEING pipeline ...

Mplayer output:

$ mplayer dts-audio-snipplet.mkv 
MPlayer SVN-r28238 (C) 2000-2007 MPlayer Team
CPU: Intel(R) Pentium(R) M processor 1.86GHz (Family: 6, Model: 13, Stepping:
8)
CPUflags:  MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 1
Compiled for x86 CPU with extensions: MMX MMX2 3DNow 3DNowEx SSE SSE2
mplayer: could not connect to socket
mplayer: No such file or directory
Failed to open LIRC support. You will not be able to use your remote control.

Playing dts-audio-snipplet.mkv.

[mkv] Track ID 1: audio (A_DTS), -aid 0, -alang und
[mkv] No video track found/wanted.
Matroska file format detected.
==========================================================================
Opening audio decoder: [libdca] DTS decoding with libdca
Stream with high frequencies VQ coding
AUDIO: 48000 Hz, 2 ch, s16le, 1536.0 kbit/100.00% (ratio: 192000->192000)
Selected audio codec: [dts] afm: libdca (DTS-libdca)
==========================================================================
AO: [pulse] 44100Hz 2ch s16le (2 bytes per sample)
Video: no video
Starting playback...
A:   5.7 (05.7) of 6.1 (06.1) 18.5% 0% 

Exiting... (End of file)

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