mix-matrix in audioconvert plugin ignored for some files

[moritz.vieli]

Hi there

I have two test files:
- 4 channels: https://www.dropbox.com/s/bzw7c66d0asrcob/ok.wav?dl=0
- 2 channels: https://www.dropbox.com/s/yk1nbkied5se8xa/nok.wav?dl=0

The files are played with the following pipelines:
- ok.wav: gst-launch-1.0 uridecodebin uri=file:///test/ok.wav ! audioconvert
mix-matrix="<<(float)0.0, (float)0.0, (float)0.0, (float)0.0>, <(float)0.0,
(float)0.0, (float)0.0, (float)0.0>>" ! audioresample ! osxaudiosink

- nok.wav: gst-launch-1.0 uridecodebin uri=file:///test/nok.wav !
audioconvert mix-matrix="<<(float)0.0, (float)0.0>, <(float)0.0,
(float)0.0>>" ! audioresample ! osxaudiosink

Now, I'd expect both files to be played completely silent. It works
perfectly for ok.wav, but unfortunately, the mix-matrix seems to be
completely ignored for nok.wav and the file is played in stereo.

Here is the output of gst-discoverer-1.0:

ok.wav
----
Topology:
  audio: audio/x-wav
    Tags:
      Containerformat: WAV
      Bitrate: 5644800
      Audio-Codec: Uncompressed 32-bit IEEE float audio
    
    Codec:
      audio/x-wav
    Additional info:
      None
    Stream ID: 341a6ef67d495ed33284a5b4182f6232
    Language: <unknown>
    Channels: 4 (front-left, front-right, rear-left, rear-right)
    Sample rate: 44100
    Depth: 32
    Bitrate: 5644800
    Max bitrate: 0

Properties:
  Duration: 0:00:17.280000000
  Seekable: yes
  Live: no
  Tags: 
      Containerformat: WAV
      Bitrate: 5644800
      Audio-Codec: Uncompressed 32-bit IEEE float audio

nok.wav
----
Topology:
  audio: audio/x-wav
    Tags:
      Containerformat: WAV
      Bitrate: 2822400
      Audio-Codec: Uncompressed 32-bit IEEE float audio
    
    Codec:
      audio/x-wav
    Additional info:
      None
    Stream ID: 0f9d10198a75ec7f310075e4f27d4d97
    Language: <unknown>
    Channels: 2 (front-left, front-right)
    Sample rate: 44100
    Depth: 32
    Bitrate: 2822400
    Max bitrate: 0

Properties:
  Duration: 0:04:02.744784581
  Seekable: yes
  Live: no
  Tags: 
      Containerformat: WAV
      Bitrate: 2822400
      Audio-Codec: Uncompressed 32-bit IEEE float audio

I am running Gstreamer 1.14. Apart from the the different channel count, I
could not figure a relevant difference. Do you have an idea, why the
mix-matrix does not work for nok.wav?

Best,
Moritz



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