[MEncoder-users] re-encoding avi to normalise sounds (and turn into 5.1)

[Alex Samad]

On Sun, Jan 06, 2008 at 03:13:06PM +1100, Alex Samad wrote:
> On Sun, Jan 06, 2008 at 02:55:38PM +1100, Alex Samad wrote:
> > I have some avi files that seem to have their sound turn down, every time I 
> > play them on the stereo I have to turn the volume right up.
> > 
> > So I have done some looking around and found mencoder -af volnorm=1
> > 
> > This seems to do the trick, whilst reading up about that I also found surround, 
> > centre and sub, figure I would give that a go as well.
> > 
> > my source
> > orig.avi: RIFF (little-endian) data, AVI, 720 x 540, 25.00 fps, video: DivX 5, 
> > audio: Dolby AC3 (stereo, 48000 Hz)
> > 
> > plays okay with mplayer, I can skip forwards and backwards and everything stays 
> > in sync - just that sounds is quiet
> > 
> > just to make testing easier I cut it down with
> > 
> >  mencoder orig.avi -o a.avi -ovc copy -oac copy -frames 3000
> > 
> > a.avi: RIFF (little-endian) data, AVI, 720 x 540, 25.00 fps, video: DivX 5, 
> > audio: Dolby AC3 (stereo, 48000 Hz)
> > 
> > Every thing is okay with this I can skip forward and backward and everything 
> > stays in sync
> > 
> > I do my work
> >  mencoder a.avi -o b.avi -ovc copy -oac lavc -lavcopts acodec=ac3 -af 
> > volnorm=1,surround=15,center,sub -channels 6
> > 
> > it finished okay, but when I play it, the sound volume has increased, but when 
> > I try to skip ahead or backwards the sounds starts from the beginning
> > 
> > b.avi: RIFF (little-endian) data, AVI, 720 x 540, 25.00 fps, video: DivX 5, 
> > audio: Dolby AC3 (6 channels, 48000 Hz)
> > 
> > 
> > seems like the audio index is out ????  I seem to remember making 5.1 DVD's a 
> > while back but using a tool called multimux.
> > 
> > Is what i am trying possible with mencoder. I have tried just doing the volnorm 
> > filter but the same problem !
> I have tried this with mp3 output instead
> 
> mencoder a.avi -o c.avi -ovc copy -oac mp3lame -lameopts cbr:br=128 -af 
> volnorm=1

I have used avisync -i b.avi -o b-syn.avi and all seems to be well, is this a 
fault with mencoder ?

> 
> and I can seek through the file ?
> 
> > 
> > Thanks
> > Alex
> 
> 
> 
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> > MEncoder-users at mplayerhq.hu
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