[FFmpeg-user] improving performances- general questions
guerra.rossana at gmail.com
Fri Aug 17 00:54:35 CEST 2012
2012/8/16 Lou <lou at lrcd.com>
> On Thu, 16 Aug 2012 19:10:40 -0300
> Rossana Guerra <guerra.rossana at gmail.com> wrote:
> > ok, thanks I'll take note.
> > about graphic card? it would hep?
> Also note that top-posting is not recommended on this mailing list.
> > 2012/8/16 Roger Pack <rogerdpack2 at gmail.com>
> > > > Actually the console command is quite simple, and the output it is
> > > > straightforward
> > > >
> > > > Command line:
> > > >
> > > > ffmpeg -loglevel error -i video1.avi -vf "movie=logo.png [logo];
> > > [in][logo]
> > > > overlay=W-w-10:10:1[out]" -vcodec libx264 -acodec libmp3lame -b 1400k
> > > -b:a
> > > > 192k outlogov1.avi
> Why AVI and not MP4 or MKV? AVI is generally not recommended with H.264.
> > > and your output?
> > > ...
> > > >
> > > > Sum it up:
> > > > - a good processor?
> > > > - RAM requirements? 2gb more?
> > >
> > > RAM won't help I doubt (as long as it's using 100% cpu...ffmpeg tends
> > > to not use too much RAM).
> > >
> > > Since you're using libx264 you could use
> > > -preset ultrafast (makes the files larger, but faster encoding)
> > > or use mpeg4 for the video codec if that's an option.
> Current x264 presets in descending order of speed are: ultrafast,
> superfast, veryfast, faster, fast, medium, slow, slower, veryslow,
> placebo. Ignore placebo as it is a joke and a waste of time. Typical
> recommendation is to use the slowest preset you have patience for. If
> it is too slow use a faster preset.
> You asked about threads earlier but it was cut in a previous reply.
> Recent ffmpeg uses "-threads 0" with libx264 by default, IIRC, so you
> don't need to mess with that option. The value of "0" confuses some
> people, but to simplify consider it to be "auto" and not "no threads".
first. sorry for the top posting.
Second, thanks for the very complete response, very useful.
Third I miss to respond something, the files are in avi format and it quite
impossible to change them now.
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