[PLUG] Video transcoding framerate problem: ogg -> avi

[wes]

On Fri, Jan 6, 2012 at 10:47 PM, Scott Garman <sgarman at zenlinux.com> wrote:

> Hello,
>
> I'm going a bit crazy trying to do something that I think should be
> quite simple.
>
> I'm creating some screencasts, using GTK RecordMyDesktop. It produces
> Ogg Theora video files. I need to convert these to AVI files for later
> processing.
>
> Using mencoder, I'm finding that the framerate and length of the
> resulting video does not match the original by a long shot. A 10-minute
> ogg video comes out as 7 minutes after transcoding. According to GTK
> RecordMyDesktop, the framerate of the original should be 15fps.
>
> mencoder has two options for framerate. -fps specifies the framerate of
> the original file, and -ofps specifies the framerate of the output file.
> Setting either or both of these to 15 still does not resolve the issue.
>
> By trial and error I managed to create an output video of the expected
> length by setting -fps to 6.28. But this only applies to that particular
> video, and I have dozens more of different lengths to do the same to.
>
> I've also tried using ffmpeg to do the conversion. It gets the length of
> the video correct but degrades the quality substantially, so I'd like to
> see if I can get mencoder to work properly.
>
> Has anyone else encountered this before? I've gone down so many
> dead-ends via Google now that my head is spinning.
>
> Thanks,
>
> Scott
>

My advice is to stick with ffmpeg, and play with the quality settings until
you get acceptable results.

-wes