Problem decoding audio using gnonlin

[Ralph]

I'm trying to use gnonlin for playing a sequence of avi file fragments.  All avi files are the same:
video: Xvid ISO MPEG-4 720x576 25fps
audio: MPEG-1 Layer 2 48KHz 192kb/s stereo

The audio is played using:
gnlfilesource - gnlcomposition - autoaudiosink

I link gnlcomposition to autoaudiosink when gnlcomposition creates a dynamic audio pad.
The source pad reports the following caps:
{audio/x-raw-int, channels=(int)[ 1, 2 ], rate=(int)[ 4000, 96000 ], signed=(boolean)true, endianness=(int)1234, width=(int)16, depth=(int)16; audio/x-raw-int, channels=(int)[ 1, 2 ], rate=(int)[ 4000, 96000 ], signed=(boolean)true, endianness=(int)1234, width=(int)32, depth=(int)32; audio/x-raw-float, channels=(int)[ 1, 2 ], rate=(int)[ 4000, 96000 ], endianness=(int)1234, width=(int)32; audio/x-raw-float, channels=(int)[ 1, 2 ], rate=(int)[ 4000, 96000 ], endianness=(int)1234, width=(int)64}

It looks like an already decoded audio stream ("audio/x-raw" caps), but instead of a nice sound, a terrible digital noise can be heard from the speakers.
What am I doing wrong?

A sample video file is available at: http://ralphos.com/video/test6.avi (only left channel contains audible sound).

[Ralph]

Ralph wrote

I'm trying to use gnonlin for playing a sequence of avi file fragments.  All avi files are the same:
video: Xvid ISO MPEG-4 720x576 25fps
audio: MPEG-1 Layer 2 48KHz 192kb/s stereo

The audio is played using:
gnlfilesource - gnlcomposition - autoaudiosink

I link gnlcomposition to autoaudiosink when gnlcomposition creates a dynamic audio pad.
The source pad reports the following caps:
{audio/x-raw-int, channels=(int)[ 1, 2 ], rate=(int)[ 4000, 96000 ], signed=(boolean)true, endianness=(int)1234, width=(int)16, depth=(int)16; audio/x-raw-int, channels=(int)[ 1, 2 ], rate=(int)[ 4000, 96000 ], signed=(boolean)true, endianness=(int)1234, width=(int)32, depth=(int)32; audio/x-raw-float, channels=(int)[ 1, 2 ], rate=(int)[ 4000, 96000 ], endianness=(int)1234, width=(int)32; audio/x-raw-float, channels=(int)[ 1, 2 ], rate=(int)[ 4000, 96000 ], endianness=(int)1234, width=(int)64}

It looks like an already decoded audio stream ("audio/x-raw" caps), but instead of a nice sound, a terrible digital noise can be heard from the speakers.
What am I doing wrong?

A sample video file is available at: http://ralphos.com/video/test6.avi (only left channel contains audible sound).

Problem solved.
When writing the original post I didn't mention that I had looked at the source code of a few programs using gnonlin and had discovered that audioconvert should be insterted between gnlcomposition and autoaudiosink.  When I tried doing that, I got no audio at all and the video playback was slowed down.
Today I discovered that what the pipeline was missing an audioresample element.  It seems my soundcard was fixed at 44.1kHz and the audio channel of the avi file was 48kHz and needed resampling.

The pipeline looks like this:
gnlfilesource - gnlcomposition - audioconvert - audioresample - autoaudiosink