[FFmpeg-user] Help needed to work around incorrect DTS when capturing H264 from a Logitech C920

[Georgi Chorbadzhiyski]

On 12/16/2014 11:07 AM, Peter Rabbitson wrote:
> On 12/15/2014 06:49 PM, Carl Eugen Hoyos wrote:
>> Peter Rabbitson <rabbit+list <at> rabbit.us> writes:
>>
>>> ffmpeg -r 30 -f v4l2 -s 1920x1080 -vcodec h264
>>
>> I believe -r 30 does not do what you think it does
>> and it may be the reason for the issues you see.
>> Is there a problem if you remove it?
>>
>>> -i /dev/v4l/by-id/*HD_Pro_Webcam_C920* \
>>>     -c:v copy -f matroska -

I've used Logitech C920 and noticed that the camera drops it's frame rate
without signaling it. So what happened was that I was seeing stuttering
in high resolutions and only when I dropped the camera resolution to 640x480
I was able to get steady input fps.

The lowering of frame rate occurred when the camera lens do not receive
enough light.

You are may be seeing similar problem.

-- 
Georgi Chorbadzhiyski | http://georgi.unixsol.org/ | http://github.com/gfto/