On Thu, Nov 05, 2009 at 05:50:08PM +0100, Miroslav Rovis wrote: > > >> mencoder -fps 25 -ofps 25 -noskip -mc 0 -vf harddup,softskip tv:// -tv > >> input=1:driver=v4l2:device=/dev/video0:normid=3:input=1:alsa:adevice=hw.0:audiorate=48000:amode=1:width=768:height=576 > >> -ovc lavc -lavcopts vcodec=mpeg4:autoaspect:vbitrate=8000 -oac mp3lame > >> -srate 48000 -lameopts cbr:preset=standard -endpos 100 -o VHS155_`date > >> +%H%M%S`.avi > >> > > > > While I do not know if it can even work without, -fps 25 tells > > MPlayer/mencoder to assume that there are always exactly 25 frames per > > second. If the capture card loses sync during the bad sections and does > > not produce any frames that is of course not going to work out at all. > > > > > Thanks for trying to help. 25 frames per second is the PAL standard, > it's by the book and by the google that anyone, as far as I had searched > earlier, capturing PAL VHS on composite input do (some even recommend > -fps 50)... No, you misunderstand: -fps 25 tells MPlayer to assume the input to be _exactly_ 25 fps no matter what, ignoring completely when the data arrives from the capture card. If you have a broken part in the video, it will not be able to capture _any_ frames, so during that time it is actually 0 fps, and with -fps 25 you explicitly _forbid_ MPlayer to correct this. There is also a fps option for -tv which is something else and which is supposed to work in a saner way. Still, to handle it properly you'd need support for variable frame-rate in-/output which MPlayer does not have.
