Frames skipped while recording

[ralf.butler]

Hi there,

On my debian machine I record two camera streams link this:

Code: Select all

cvlc --color --run-time=10 v4l2:///dev/video0 :input-slave=alsa://hw:0,0 :v4l2-standard=0 :sout='#transcode{vcodec=mp4v,vb=800,scale=1,acodec=mpga,ab=128,sfilter=marq}:std{access=file,mux=mp4,dst=/tmp/out0.mp4}' --sub-filter marq --marq-marquee \"%D %H:%M:%S\" --marq-position 6 & cvlc --color --run-time=10 v4l2:///dev/video1 :v4l2-standard=0 :sout='#transcode{vcodec=mp4v,vb=800,scale=1,acodec=none,sfilter=marq}:std{access=file,mux=mp4,dst=/tmp/out1.mp4}' --sub-filter marq --marq-marquee \"%D %H:%M:%S\" --marq-position 6 &

Sometimes the both output files differ. For example I can see when replaying the second one that suddenly frames are skipped. Moving objects in the video are somehow 'teleported' to a location. Could this be a hardware related issue? Or can this be avoided by adding a magical command to vlc to make the output more reliable?

Thanks,
Ralf

[Rémi Denis-Courmont]

Encoding two raw videos at the same time is CPU intensive. It is not unlikely that your CPU is too slow.

[ralf.butler]

Yes, I feared that. Furthermore I encode not only 2 but 4 videos on a Pentium 4. Ok, what do you think of a Core 2 Duo. Will that work?

Thanks Remi!

[ralf.butler]

Thanks Remi. That did the job.