[MEncoder-users] duplicate frames - shortening video?

[hans at netupgrades.com]

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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