Fwd: ogg quality problem with ffmpeg

---------- Forwarded message ----------
From: Keith Richie <disturbed1976@xxxxxxxxx>
Date: Sun, Mar 9, 2008 at 1:04 PM
Subject: Re: ogg quality problem with ffmpeg
To: asm4@xxxxxxxxxx



On Sun, Mar 9, 2008 at 11:58 AM, asm4 <asm4@xxxxxxxxxx> wrote:
Alex Samad wrote:
> On Sat, Mar 08, 2008 at 11:57:14AM -0800, David Fox wrote:
>> On 3/8/08, asm4 <asm4@xxxxxxxxxx> 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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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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