RE: Video Encoding Slowness

Yes encoding take very long when the input is reprocessed. I used to do it
with avisynth / virtualdub on windows and it did output about 4-6 frames per
second when encoding from the raw format taken by a numeric cam (don't
recall which one) to xvid on an intel celery 566mhz with 768MB of ram (it
was for a university presentation).

Which computer do you have?

Alain

> -----Message d'origine-----
> De : [email protected] [mailto:lfs-chat-
> [email protected]] De la part de Matt Burgess
> Envoyé : 29 décembre 2011 14:18
> À : [email protected]
> Objet : Video Encoding Slowness
> 
> Hi all,
> 
> I'm looking into ripping my DVD collection into WebM format (VP8 video
> via libvpx, and vorbis audio via libvorbis).  The following command
> works, in that it gives me a suitable quality video with audio in sync:
> 
> ffmpeg -i input.vob -aspect 16:9 -vpre libvpx-720p -aq 5 -f webm -y \
>   output.webm
> 
> However, it takes a long time to encode.  It averages around 6fps.
> Bearing in mind that the source file is 24fps, this means that encoding
> takes 4 times as long than actually watching the DVD.
> 
> This may be usual in the video encoding world, but I've only ever had
> experience of encoding audio, which typically happens at a faster rate
> than it takes to listen to.
> 
> So, I guess my questions are: 1) am I expecting too much, 2) Does other
> people's experience match mine or 3) How do I speed this process up?
> 
> Thanks,
> 
> Matt.
> 
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