Re: [MEncoder-users] How to avoid A/V synchronisation pb

On Sun, May 4, 2008 at 2:27 PM, Jorge Peixoto de Morais Neto
<please.no.spam.here@gmail.com> wrote:
> On Tue, Apr 29, 2008 at 4:52 AM, Philippe MONROUX
> <phi2-monroux@wanadoo.fr> wrote:
> > Hi,
> >
> > First I apologize for my poor english.
> >
> > My goal is to x264 2-pass encode one dvd title to one 700 M cd with ogg
> > vorbis sound (not very original...)
> >
> > So in first I need to rip sound to know its size (SoundSize) to have
> > better bitrate calculation (700-SoundSize)*1024^2*8/t/1000
> >
> > I've read the doc but I'm not sure about my method to avoid A/V
> > synchronisation pbs.
> >
> > Here is my method :
> >
> > 1) rip audio to audio.ogg --> SoundSize --> bitrate
> >
> > 2) pass 1 :
> > mencoder dvd://1 -aid 128 -oac copy -vf [filters] -ovc x264
> > -x264encopts [options-pass1]turbo=2:pass=1 -o /dev/null
> >
> > 3) pass 2 :
> > mencoder dvd://1 -aid 128 -oac copy -vf [filters] -ovc x264
> > -x264encopts [options-pass2]:pass=2 -o out.avi
> >
> > 4) mkv creation...
> >
> > My question is about "-ovc copy" in pass-1 and pass-2. Is it a good
> > choice to A/V synchronisation pbs or is there a better choice (I read
> > nosound is not a good choice).
>
> I use -oac copy and it has worked well.
> Oh, and about the bitrate:
> A CD labeled as 700 MB has 703.125
>
Shhhhh, Gmail is fricking buggy. I meant:

A CD labeled as 700 MB has 703.125 MiB. In my last test, Matroska
muxing had an overhead of 0.315%. So you can assume that the actual
audio + video data can be up to 700.91 MiB, or 734957568 bytes.

Keep in mind that if the final file ends up a little bigger than what
you expect, you don't have to start over. You can overburn the CD.
According to Wikipedia, a CD can sometimes be overburned by up to 10%,
so it is pretty safe to overburn by 0.1%. So you dont have to start
over if your final file has 703.83 MiB instead of 703.125 MiB.

--
Software is like sex: it is better when it is free - Linus Torvalds
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