On 20.07.2013 11:57, Julien Claassen wrote:

Hello Knut! No idea yet, who's to blame. but have you tried repeating the experiment with another tool. You can use audacity, so you can use the GUI.

Audacity is even more broken. That´s true for the version from opensuse (2.03), and it´s true for the current development code,

If I mark that 1s of audio described in the original post, a lot of audio is missing at the beginning and a bit of audio is missing at end. In total only about 460 msec of audio is captured, 540 msec is lost.

Audacity currently does not playback correctly with non-memory-mapped alsa devices. But that´s another story ;-(

There are other recording applications. Or you might even try with the alsa utilities aplay and arecord. this will require two console or terminals.

If I put

arecord -f cd -D hw:0,0 -d 2 testarec.wav & aplay testin.wav -D hw:0,0

into a script I get a perfect recording: 47 msec silence, exactly 1s of audio data, silence up to the end of the file. Well, that result seems to indicate that I found an ecasound bug. Unless it´s some alsa code unused by aplay ;-)

You might also try the same experiment with JACK, if you're not averse to it.

In the best case that could only mask the bug.

I did digitise a few tapes and prelistened to the volume and audio quality.

So it's not a problem in general.

Half a second silence at the end of the audio masks the bug. Because of that I agree that it´s not a general problem, most people will never notice it. But it´s still a bug.

cu, Knut