playbin : no mp4 sound

[Otwoh]

Hello.

Here, some precisions about my problem.
I tested to launch a mp4 file with other gstreamer element, like gtdemux,
decodebin, uridecodebin, etc.
each one failed.

The problem seem to be that I haven't the good decoder. I had the following
error :

WARNING: from element /GstPipeline:pipeline0/GstURIDecodeBin:uridecodebin0:
No decoder available for type 'audio/mpeg, mpegversion=(int)4,
framed=(boolean)true, codec_data=(buffer)12100000000000000000000000000000,
rate=(int)44100, channels=(int)2'.


I tried to specified the audio decoder to use, but the same error append.

Is the mpeg audio decoder must be manualy added to GStreamer ?
All the tutorials I found on the web just intalled the basic version of
GStreamer.

PS : I'm working on Windows 8




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