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SDK 7 Audio Problem

I am working with a beaglebone black + ezsdk 7. I have an usb audio card, and I would need to play audio by this card.  It works once, the second it crashes. The followng  is what happens:

root@am335x-evm:~# cat /proc/asound/cards

0 [Device ]: USB-Audio - C-Media USB Audio Device

C-Media USB Audio Device at usb-musb-hdrc.1.auto-1.4, full speed

If I run the audio example that I have found in matrix(AAC Decode) it shows:

amixer: Cannot find the given element from control default.

Length of audio clip: 18 segonds

aunch Gstreamer pipeline

Setting pipeline PAUSED

Setting pipeline PREROLLED

New clock: GstAudioSinClick

Got EOS from element “pipeline0”

Execution ended after..

Setting pipeline to PAUSED

And then I can hear the audio

If I run it again:

I shows:

amixer: Cannot find the given element from control default.

Length of audio clip: 18 segonds

aunch Gstreamer pipeline

Setting pipeline PAUSED

Setting pipeline PREROLLED

New clock: GstAudioSinClick

It doesn´t reproduce the audio any more.

If I use gstreamer from command line the behaviour is the same and the console hanged, the only way to get out of there is ctrl+c.

I can run amixer from command line:

root@am335x-evm:~# amixer

Simple mixer control 'Speaker',0

Capabilities: pvolume pswitch pswitch-joined

Playback channels: Front Left - Front Right

Limits: Playback 0 - 151

Mono:

Front Left: Playback 44 [29%] [-20.13dB] [on]

Front Right: Playback 44 [29%] [-20.13dB] [on]

Simple mixer control 'Mic',0

Capabilities: pvolume pvolume-joined cvolume cvolume-joined pswitch pswitch-joined cswitch cswitch-joined

Playback channels: Mono

Capture channels: Mono

Limits: Playback 0 - 32 Capture 0 - 16

Mono: Playback 0 [0%] [0.00dB] [off] Capture 0 [0%] [0.00dB] [on]

Simple mixer control 'Auto Gain Control',0

Capabilities: pswitch pswitch-joined

Playback channels: Mono

Mono: Playback [on]