[MPlayer-users] Convert 23.97fps to PAL 25fps w/o duplicate frames

[D Richard Felker III]

On Sat, Mar 26, 2005 at 06:56:05PM +1200, Greg Trounson wrote:
> On Sat, 26 Mar 2005, D Richard Felker III wrote:
> 
> >On Sat, Mar 26, 2005 at 12:59:51PM +1200, Greg Trounson wrote:
> >>Hi,
> >>
> >>I'm trying to master some clips to PAL DVD, using mencoder -> avidemux ->
> >>dvdauthor, with as high a quality as possible.
> >>
> >>If my sources are 23.97fps NTSC, then I need to convert them to PAL frame
> >>rate before passing it to avidemux (avidemux automatically takes care of
> >>the resolution).
> >>
> >>mencoder -ofps 25 doesn't cut it, since it inserts duplicate frames,
> >>producing an irritating jerkiness every second or so when played back.
> >>Commercially made DVDs get around this by just speeding up the playback
> >>rate 4%, so every single frame is played, but the action is slightly
> >>faster and the sound is slightly higher pitched (nearly a semitone, I'm
> >>told).  This is why Region 4 DVDs generally have a shorter running time
> >>than Region 1.
> >>
> >>My question is, how can I get mencoder to convert a movie clip to 25fps
> >>by /only/ speeding up the video and audio playback rate (ie without
> >>duplicating frames)?
> >
> >Use latest cvs and pass the option -speed 25025/24000. You'll also
> >need -srate 44100 or 48000 to force the audio to get resampled back to
> >a valid samplerate for encoding, and you might want to include -ofps
> >25 too just to make sure a slight error doesn't result in it being
> >25.0001 fps or something stupid.
> >
> 
> Thanks, I'll give that a go.  Is "-speed" enabled as an encoder option 
> in 
> CVS?  I notice it's player only in current releases.

Yes, added last week.

Rich