Re: [dvd::rip] Resulting avi is much smaller than target

[lynx.abraxas@xxxxxxxxxx]

On 05/09/06 16:21:39, Florian Lindner wrote:
> Am Montag, 4. September 2006 09:08 schrieb lynx.abraxas@xxxxxxxxxx:
> > On 03/09/06 22:18:13, Florian Lindner wrote:
> > > Hello,
> > > I've ripped and trancoded an DVD using the following settings:
> > >
> > > [General]
> > > Title:                 Doom
> > > Data source:           DVD
> > > DVD title number:      1
> > > Runtime:               01:48:07
> > >
> > > [Video]
> > > Video format:          PAL
> > > FPS:                   25.000
> > > Size:                  624 x 272
> > > Video bitrate (kbps):  1413
> > > Video codec:           xvid
> > > 2-pass-encoded:        yes
> > > Fast resizing:         yes
> > > Deinterlacer filter:
> > > Antialiasing filter:   Kein Antialiasing
> > >
> > > [Audio 1]
> > > DVD audio track id:    1
> > > Language:              de
> > > Audio codec:           mp3
> > > MP3 quality:           2
> > > Channels:              2
> > > Sample rate:           48000
> > > Audio bitrate (kbps):  128
> > > Volume rescaling:      1.241
> > > Audio filter:          Keine, nur Lautst???kenmaximierung
> > >
> > > [Programs]
> > > dvd::rip version:      0.98.1
> > > transcode version:     1.0.2
> > >
> > > The target file size was set to 1200 MB. The resulting file is only 750
> > > MB. The vob files which make this chapter have a size of 5,3 GB.
> > > Why is the resulting file so much smaler than the target?
> >
> > I  had  similar  problems.  It  seems  xvid  has  a  compression limit at
> > high bitrates. The file size of the result then only changes unnoticeably
> > by  about 1MB  even  if  you  increase  the  bitrate by 1000. I there for
> > changed to use ffmpeg with mpeg4. It is a free codec with mpeg4 chosen as
> > the method,  as  is xvid,  just  better  and  much  quicker.  It  comes 
> > from  the  ffmpeg/mplayer developers. You might have to delete an f in  the
> >  source  of  ffmpeg  to  get second pass to work. See other threads.
> 
> I've reencoded it now using ffmpeg. The second pass went through without 
> trouble. The resulting file is now 920 MB. Is it really possible that the 
> codec has reached maximum quality with this size? The input track is 1:48 
> length from a commercial DVD. (The movie is "Doom")

What  do you mean by 1:48 length? 2min of a 100 min film? So far I have always
hit the exact amount of MB I specified with ffmpeg/mpeg4. But for that I  used
vorbis  for the audio. DVD::Rip then ajusts the bitrate when it knows the size
of the audio part in the second pass. With vorbis this is always quite a  bit.
Otherwise  I  don't  know,  it  could  be a limit. mplayer should tell you the
average bitrate of a film when you start playing it.

Lynx