[linux-uvc-devel] [Bug] Logitech C920 capture broken by UVC timestamp support (66847ef)
Linux UVC driver and tools
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From: Peter R. <rab...@ra...> - 2014-12-18 17:36:34
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Hi! After a lot of trial an error I bisected the bug down to this commit: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=66847ef A simple capture command like this: ffmpeg -f v4l2 -s 1920x1080 -vcodec h264 \ -i /dev/v4l/by-id/usb-*HD_Pro_Webcam_C920* \ -c copy -copyinkf -f matroska rec_cam.mkv Works fine up to the parent of this commit (25738cb), but from 66847ef onwards there is a noticeable "stutter" every ~2.5 seconds. An example can be seen here: https://vimeo.com/114550042 This problem has been observed by others as well, but it seems it has not been bisected up untill now: https://trac.ffmpeg.org/ticket/3956 http://permalink.gmane.org/gmane.comp.video.ffmpeg.user/55069 Please let me know if I can help with resolving this (I have the hardware and the ability to run a custom kernel). Cheers |