[MEncoder-users] duplicate frames - shortening video?

[Steven Miller]

My apologies if this has been further addressed. My inbox was damaged and I
believe I lost a few emails.

Have you tested the source? Is all well on that end? Couple of things,

     What is the source video codec?
     Is the video  and or audio cbr or vbr or a mix (if mixing the two is
even possible).
     Are you sure on the frame rate?
     Is it telecene? If so I believe there are instances where attempting
to set the frame rate could be ignored during encoding without addressing
the telecine.
     If it were telecine, a filter combo something like '-vf
pullup,softskip,harddup' would be needed.

I see your recompressing audio. Going from mp3 to mp3. Perhaps you can use
'-oac copy' for the encoding portion. Then using mplayer go back to the
original source file, '-ao pcm:waveheader:file=foo.wav'. Once you have your
wav file, use lame to rencode the audio.

Demux the video using the tool(s) of choice. Then remux the video and audio.

A very round about way to do it, but it's worked for me a number of times.

Either way I'm betting '-ofps' will most likely be needed to address the
'Duplicate Frame' messages.

Again, I apologize if I've missed a resolution or am asking already
answered questions.

Steve
On Jun 4, 2012 11:24 PM, <hans at netupgrades.com> wrote:

> Thanks Lobster.
>
> Still I am getting a video of very fast scrolling down the page as if
> mencoder has discarded these long scroll pauses as duplicates and
> optimized the video by removing the duplicates.
>
> Anything else to try to preserve all the frames in the source vid?
>
> Thanks! :)
>
> Lobster <lobo at lobs.sytes.net> wrote:
>
> > On 5/06/2012 11:01 a.m., hans at netupgrades.com wrote:
> > > Hi -
> > >
> > > Videos are being shortened (losing frames?).
> > >
> > > My source video is a desktop recording of me scrolling down a web
> > > page, and I wait for a few seconds each time before I scroll down
> > > further.
> > >
> > > I think mencoder is optimizing these "similar" frames and drops
> > > them.
> > >
> > >
> > > I have tried many variations to keep my long scroll pauses intact:
> > >
> > > mencoder out.ogv -audiofile myfile.mp3 -ovc lavc -oac mp3lame -fps
> > > 5 -o test.avi
> > >
> > > mencoder out.ogv -audiofile myfile.mp3 -ovc lavc -oac mp3lame -fps
> > > 15 -o test.avi
> > >
> > > mencoder out.ogv -audiofile myfile.mp3 -ovc lavc -oac mp3lame -fps
> > > 15 -vf harddup -o test.avi
> > >
> > > mencoder out.ogv -audiofile myfile.mp3 -ovc lavc -oac mp3lame -vf
> > > harddup -o test.avi
> > >
> > > These are the type of messages I see:
> > >
> > > 1 duplicate frame(s)!
> > > Pos:  10.9s    151f (93%) 16.10fps Trem:   0min   2mb  A-V:-0.133
> > > [1406:210]
> > >
> > >
> > > Each time, I see duplicate frames being dropped, and my video is a
> > > very fast scrolling down the web page.
> > >
> > > I thought -vf harddup made it not lose frames?
> > >
> > > How do I keep the same video length as my source file?
> >
> > use -ofps to force the output frame rate.
> > I.E `mencoder out.ogv -audiofile myfile.mp3 -ovc lavc -oac mp3lame
> > -vf harddup -ofps 15 -o test.avi`
> >
> >
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>
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