Fwd: ogg quality problem with ffmpeg
---------- Forwarded message ----------
From: Keith Richie <disturbed1976@gmail.com>
Date: Sun, Mar 9, 2008 at 1:04 PM
Subject: Re: ogg quality problem with ffmpeg
To: asm4@lehigh.edu
On Sun, Mar 9, 2008 at 11:58 AM, asm4 <asm4@lehigh.edu> wrote:
> Alex Samad wrote:
> > On Sat, Mar 08, 2008 at 11:57:14AM -0800, David Fox wrote:
> >> On 3/8/08, asm4 <asm4@lehigh.edu> wrote:
> >>
> >>> the nominal bit rate shown by xmms or mplayer on out.ogg is 0k and
> >>> average bit rate is 41.7kbps
> > I don't think you can compare bit rates, ogg has better compression than
> > mp3 so 128kb ogg is suppose to sound better than 128kb mp3
>
>
> hi all,
> thanks for the replies. i compared the bit rates of 2 ogg files. one
> created by using ffmpeg (0k nominal, 41k avg), the other created by
> dumping a wav and converting to ogg using audacity (160k nominal,113k avg).
>
>
> >> Is the quality (or lack of) extremely noticable? Ogg is variable rate,
> >> and by "VOB" i'm thinking "movie",
> >> where there may be a large variation of sound sources, compared to for
> >> example a music CD.
>
>
> the lack of quality is extremely noticable. the VOB is indeed a video
> recording of a performance and i just wanted to get the sound. i can
> live with dumping wav and converting using audacity. its just too much pain.
>
> >>
>
> >> Then again, it could be an ffmpeg problem. I don't have any ready vobs
> >> here to test. But I routinely dump audio from other sources (such as
> >> avi) and encode those with ffmpeg, but not to ogg, usually a52 because
> >> I do a fair amount of dvd encoding of avi movies.
> >>
> >>> i have 0.cvs20070307-6 of ffmpeg and this seems to be the latest
> >>> version. am i doing something wrong? or is there a better way of getting
> >> There's a later version 20071206 but it's in the
debian-multimedia repository.
>
>
> i will wait till it makes into unstable. its not a pressing issue.
> thanks for the suggestions.
>
>
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>
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>
Try
ffmpeg -i file.vob -vn -acodec vorbis -ac 2 -ab 160k out.ogg
ffmpeg doesn't support multichannel vorbis encoding so the -ac 2 is
needed. You can replace -ab with -aq if you want.
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