At Fri, 19 Dec 2008 18:49:04 +0530, naveenkrishna.ch wrote:

On Fri, Dec 19, 2008 at 6:34 PM, vasudha rao vasudha.jrao@gmail.com wrote:

...

Hi ..

I am trying to record .wav files..

I did like, $arecord -D copy test.wav Recording WAVE 'test.wav' : Unsigned 8 bit, Rate 8000 Hz, Mono xrun!!! (at least 0.251 ms long) xrun!!! (at least 0.071 ms long) xrun!!! (at least 0.072 ms long) . . .

When I run this test.wav, no sound!!!!

Am I doing wrong anywhere??

This print is coming from alsa-utils It is all about the underrun and overrun conditions

I saw some underrun error while playing back

underrun!!! (at least 771.790 ms long) underrun!!! (at least 3393.433 ms long) underrun!!! (at least 777.314 ms long)

Can any one help us understanding the issue, If possible solving it too

Look at the order of measured (least) latency in both cases. You case is almost 1 second delay while the previous one is less than 1 ms. Thus, in your case, it's either really a system latency such as disk overload or that the buffer DMA isn't properly updated or set up.

In the previous case, less than 1 ms latency, it implies that the buffer and period setup is somehow weird. For example, it's set to the very small period or buffer size, which can easily result in buffer underrun. Check the hw_params constraints and snd_pcm_hardware setting.

Takashi