Failed to map input buffer

[Sirius Wu]

HI,

I've tried setting the audio-filter of playbin to the following bin:

sink --> audioconvert for mix matrix --> pitch --> src

Because it does not work, I've changed it to

sink --> audioconvert for mix matrix -> pitch --> src

Both without the pitch element do work. But with the pitch element don't
work.

I've seen following messages:

> gst_audio_buffer_map: assertion '(!meta && info->layout ==
GST_AUDIO_LAYOUT_INTERLEAVED) || (meta && info->layout ==
meta->info.layout)' failed
>
../gst/audioconvert/gstaudioconvert.c:872:gst_audio_convert_transform:<conv>
error: failed to map input buffer
> setMessage: Error received from element conv: The stream is in the wrong
format.
>
../libs/gst/base/gstbasetransform.c:1424:gst_base_transform_reconfigure:<capsfilter0>
warning: not negotiated

What have I done wrong?

-- 
Sirius Wu
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