On 8/28/15, Felix Baier <felixbaier-at-yahoo...@ffmpeg.org> wrote: > Hi Eugen — > > I have done some more testing of the code and run the camera for a night. I > should get 8-9 videos of each one hour length per night. However, I get 4 > videos of one hour length, but at twice the speed. The frame rate apparently > is unaffected by this (still 25fps), at least as far as it is displayed in > the properties of the videos. > > I changed “-vcodec mpeg4 -qscale 2” to “-vcodec mpeg4 -q:v 2” after I got a > notification that the first version was ambiguous. The complete code I used: > > ffmpeg -r 25 -f dshow -s 640x480 -i video="Microsoft LifeCam HD-5000” > -vcodec mpeg4 -q:v 2 -f segment -segment_time 3600 -reset_timestamps 1 > -segment_start_number 1 -segment_format avi -r 25 > c:\Users\Desktop\out%%03d.avi > > Any idea what might be going on?
I believe your problem here is the use of "-r" for the input, which basically means "override what its actual framerate is, and pretend that its 25 fps" https://trac.ffmpeg.org/wiki/DirectShow#Specifyinginputframerate (any ideas out there for how we could make this more clear? Is this a general aspect more than just dshow?) Cheers! 0roger- _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
