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. > > -- > http://linuxfromscratch.org/mailman/listinfo/lfs-chat > FAQ: http://www.linuxfromscratch.org/faq/ > Unsubscribe: See the above information page -- http://linuxfromscratch.org/mailman/listinfo/lfs-chat FAQ: http://www.linuxfromscratch.org/faq/ Unsubscribe: See the above information page
