[alsa-devel] question about webcam audio capture

vichy vichy.kuo at gmail.com
Thu Sep 19 18:19:42 CEST 2013

hi Clemens:

2013/9/10 Clemens Ladisch <clemens at ladisch.de>:
> vichy wrote:
>> 2013/9/9 Clemens Ladisch <clemens at ladisch.de>:
>>> vichy wrote:
>>>> I try to do webcam audio capture on my arm platform.
>>>> when I execute audio capture I got below message
>>>> "retire_capture_urb: 108 callbacks suppressed"
>>> This means that the retire_capture_urb() function printed lots of
>>> messages, and that 108 of them were thrown away because they were
>>> identical.
>> Does that mean:
>> 1. 108 of messages are the same and through away
> No, that at least 109 are the same.
>>> You have to look at the previous line to get the actual
>>> message.
>> Would you please tell me what the "previous line to get the actual
>> message"  you mean?
> The previous line in the message log.
>> tinycap record.wav -D 0 -d 0 -c 2 -r 32000
> Try increasng -n or -p.
> Does recoding on a PC with the same parameters work?
the same parameters work well on PC.
I think it is ehci hardware problem on my embedded system.

Appreciate your kind help :)

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