[MPlayer-users] 3-pass encodes with ogg vorbis?

[*]

--- D Richard Felker III <dalias at aerifal.cx> wrote:
> On Fri, Jan 16, 2004 at 10:53:20PM -0800, * wrote:
> > Hello, I was wondering if anyone is doing 3-pass encodes with
> > ogg vorbis and have the audio in sync?  The first movie I did
> > was 25 fps and it worked but the few I've tried since then are
> > 29.97 progressive NTSC and the audio is always out of sync by
> > a noticeable amount.
>
> It's really 29.97 fps _progressive_? I've never heard of a whole movie
> like that...
>
Sorry I'm not sure what it's called?  It's not interlaced anyway.
When I play the vob it first says for example:

VIDEO:  MPEG2  720x480  (aspect 3)  29.970 fps  9800.0 kbps (1225.0 kbyte/s)
[V] filefmt:2  fourcc:0x10000002  size:720x480  fps:29.97  ftime:=0.0334

And when it actually starts playing it quickly says:

demux_mpg: 24fps progressive NTSC content detected, switching framerate.

> > Am I doing something wrong or is this a known (but not widely
> > discussed) problem?  To pullup the 29.97 I've been using the
> > "pullup" filter.  Using "ivtc=1" or "filmdint=dint_thres=256"
> > gives me jerky video for some reason on non-interlaced movies.
>
> How can we know if you're doing something wrong if you don't provide
> the command lines used? At least tell us what you mean by 3pass, since
> the 3pass procedure in mencoder makes absolutely no sense if you're
> not using mencoder to encode the audio (and does NOT work with -oac
> copy).
>
> Rich
>
Okay, I hope this isn't too verbose.  First I extract the audio with
transcode and encode with oggenc, for example:

transcode -i vob/ -o /dev/null -a 0 -s 1.650 -a52_drc_off
-x null,vob -y raw -N 0x1 --export_fps 23.976,1 -m audio.pcm

oggenc -r -C2 -R48000 -q 0 -o audio.ogg audio.pcm

(It shouldn't matter what I extract the audio with right?  If not, I
guess that could be my problem.)  Next I encode the video:

cat VTS_01_1.VOB VTS_01_2.VOB VTS_01_3.VOB VTS_01_4.VOB |
mencoder -oac copy -ovc lavc -lavcopts mbd=2:mv0:trell:cbp:precmp=2
:cmp=2:subcmp=2:vmax_b_frames=1:predia=2:dia=2:preme=2:vme=4:v4mv
:vbitrate=856:vpass=1 -vf crop=720:362:0:56,scale=720:304,pullup
-ofps 23.976 -o /dev/null -

cat VTS_01_1.VOB VTS_01_2.VOB VTS_01_3.VOB VTS_01_4.VOB |
mencoder -oac copy -ovc lavc -lavcopts mbd=2:mv0:trell:cbp:precmp=2
:cmp=2:subcmp=2:vmax_b_frames=1:predia=2:dia=2:preme=2:vme=4:v4mv
:vbitrate=856:vpass=2 -vf crop=720:362:0:56,scale=720:304,pullup
-ofps 23.976 -o movie.avi -

Then I merge the two:

ogmmerge -o movie.ogm -A movie.avi -D audio.ogg

Thanks for taking a look!


__________________________________
Do you Yahoo!?
Yahoo! Hotjobs: Enter the "Signing Bonus" Sweepstakes
http://hotjobs.sweepstakes.yahoo.com/signingbonus