[MPlayer-users] avi to vcd frame rate problems

[GD Lewis]

On Fri, 2002-10-04 at 18:55, emaillist+mpu at dogphilosophy.net wrote:
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> Perhaps this ought to be a FAQ if it's not already?  (I don't 
> recall seeing it...).  Perhaps in the 'encoding' section?
> 
> mencoder has a really simple and spiffy way of doing this:
> 
> mencoder -ofps 25.000 -oac copy -ovc copy -o new_frame_rate.avi 
> old_framerate.avi
> 
> Then use new_frame_rate.avi as the input for generating the mpeg1 file.

Doesn't work for me.  I've tried it with many avi's and even though the
resultant avi will play fine with mplayer or Xine, once converted to an
mpeg, you end up with double speed video and normal audio.

> 
> Quite honestly, this frame rate conversion feature is one of the spiffiest
> tricks I've run into in mplayer/mencoder, especially considering nobody
> else seems to do it at the moment (transcode/ffmpeg/etc.)
> 
> FEATURE REQUEST - Any chance of getting the -ofps feature implemented
> in mplayer?  That's save the 'transcode' step, and mencvcd (or home-brew
> scripts) could generate NTSC/NTSC FILM/PAL VCD/SVCD correctly from any input
> with a combination of -ofps and -vop scale...

That might work, if the feed itself is moderated, it may resolve the
conversion issue during mplex.


> On Friday 04 October 2002 10:16 am, Oskar Andreasson wrote:
> > This is a quick shot, but I am hoping for some help with a conversion. I
> > want to convert a AVI file with a FPS at 12.500 into a MPEG1 file
> > running at 25.000 (PAL?) FPS.
> >
> > To put it simple, so far my success has been quite hilarious (double
> > speed, anyone?):). Is there any way of simply "for each frame in input,
> > output frame twice" kind of function anywhere, or that will take one
> > FPS on the input and output another FPS, but without changing the player
> > speed?
> >
> > Huge thanks for any kind of reply!
> 
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-- 
Grant D. Lewis
Running Gentoo Linux kernel 2.4.19-r7 on a GenuineIntel i686

"Those who define new paradigms for the world are often considered
strange at first"