Re: [PATCH] uvcvideo: Disable hardware timestamps by default

[Paul Fertser <fercerpav@gmail.com>]

Hello Laurent,

I was experimenting with a web-camera integrated in my laptop and was
extremely confused by non-monotonic timestamps coming from the uvc
driver. In fact, the very first timestamp was bigger then the second
every time I tried. This patch helped.

More details:

1. I'm testing with

avconv -f video4linux2 -i /dev/video0 -codec copy test.mkv

2. Prior to applying the patch I was always getting "Non-monotonous
DTS in output stream 0:0" errors

3. I'm using kernel version 3.6.8 (yes, that's old, I'm ready to
upgrade if you really need that for debugging)

4. The camera is 5986:0100 Acer, Inc Orbicam

Anything else I can do to help you with this issue? My real usecase is
having a single-board computer capturing a steady stream from a UVC
webcam (h264 pixel format) while keeping timestamps reasonably
accurate (within 0.1s) for the future processing and spending as
little CPU time as possible.

Thank you in advance.
-- 
Be free, use free (http://www.gnu.org/philosophy/free-sw.html) software!
mailto:fercerpav@gmail.com