Hi everyone,
i own a Philips SPC1300NC which runs fine with uvc. Recording video never
was an issue, and since a weeks i can even record audio using the internal
mix of the camera. But i was never able to record audio and video at the
same time; not in skype, nor in any other application. When trying to
videophone with skype my communication partner receives perfect video but
only distorted audio. I some how realized the the audio distortion starts
when i start video. Running a few tests outside of skype (with arecord and
luvcview) i now have a deterinistc behaviour:
1) When audio recording is started prior to video recording, audio recording
goes only well until video recording is started.
2) When video recording is started prior to audio recording, both work
perfectly
For my test i used skype(video test in options)+skype(audio-only phone call)
skype(video test in options) + arecord
luvcview + skype(audio-only phone call)
arecord + luvcview

In all cases 1) and 2) hold.

Does anybody know why this happens? Whether this is a uvc-bug or an
alsa-bug? Any hints on how to debug this?
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