Re: (bisected) Logitech C920 (uvcvideo) stutters since 3.9

Paulo Assis
2014-11-04T15:03:21Z

I've add to change guvcview so that it now generates it's own
monotonic timestamps, kernel timestamps (uvcvideo at least), caused a
similar problem, e.g:
I would get a couple of frames with correct timestamps, then I would
get at least one with a value lower than the rest, this caused
playback to stutter.
I didn't had time to check the cause, but it has been like this for
quite some time now.

Regards,
Paulo

2014-11-04 12:42 GMT+00:00 Rémi Denis-Courmont <remi@remlab.net>:
> Le 2014-11-04 14:58, Sakari Ailus a écrit :
>>>
>>> > Have you tried with a different application to see if the problem
>>> > persists?
>>>
>>> Tried mplayer and cheese now, and it seems they are not affected, so
>>> it's an issue with vlc. I wonder why it doesn't like newer flags..
>>>
>>> Ohwell, sorry for the noise.
>>
>>
>> I guess the newer VLC could indeed pay attention to the monotonic
>> timestamp
>> flag. Remi, any idea?
>
>
> VLC takes the kernel timestamp, if monotonic, since version 2.1. Otherwise,
> it generates its own inaccurate timestamp. So either that code is wrong, or
> the kernel timestamps are.
>
> --
> Rémi Denis-Courmont
>
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