[MPlayer-users] copying AC3 audio into DivX confuse all windows players

Wed Sep 11 18:57:07 CEST 2002

hello friens,

I have a strange problem copying AC3 with mencoder. I simply want copy 
the AC3 stream (AC3: 2.0 (stereo)  48000 Hz  192.0 kbit/s) into the 
file mr.avi with this script:

#!/bin/sh
set -e
mencoder -ss 3 -endpos 20 -v -ovc frameno -o frameno.avi -oac copy ./mr.vob
mencoder -ss 3 -endpos 20 -v -oac copy -o /dev/null -ovc lavc \
-lavcopts vcodec=mpeg4:vbitrate=1000:vhq:vpass=1:vqmin=2:vqmax=31  \
-vop pp=6,scale=512:384 -npp lb ./mr.vob
mencoder -ss 3 -endpos 20 -v -oac copy -o mr.avi -ovc lavc \
-lavcopts vcodec=mpeg4:vbitrate=1000:vhq:vpass=2:vqmin=2:vqmax=31 \
-vop pp=6,scale=512:384 -npp lb ./mr.vob 

and it plays perfectly with mplayer, but with windows players (like
media player 6.x, the playa, powerdvd, etc) the sound stutter.

I think that I need specify an interleave of 80ms according to 
the Virtual_dub+ac3 page:

( http://www.xs4all.nl/~merlinx/ac3guideeng.html )
[snip]
.
.

3. There are 2 methods to get the audio and video synch.

Some people have excellent results with these settings :

192 kb preload : 80 ms interleave every 80 ms
384 kb preload : 160 ms interleave every 160 ms
448 kb preload : 128ms interleave every 128 ms

.
.

[snip]

but mencoder seems haven't any parameter for specify this,
Can I anyway encode ac3 audio with a determined interleave???

thanks

I'm uploading a sample file to ftp://ftp.mplayerhq.hu/MPlayer/incoming/mr/mr.{avi,txt}

	/------/

MPlayer 0.90pre7-2.95.3 (C) 2000-2002 Arpad Gereoffy (see DOCS!)

CPU: Advanced Micro Devices Athlon TB Thunderbird (Family: 6, Stepping: 4)
CPUflags:  MMX: 1 MMX2: 1 3DNow: 1 3DNow2: 1 SSE: 0 SSE2: 0
Compiled for x86 CPU with extensions: MMX MMX2 3DNow 3DNowEx

Reading /home/users/fan/.mplayer/codecs.conf: 38 audio & 107 video codecs
Font /home/users/fan/.mplayer/font/font.desc loaded successfully! (206 chars)
Using usleep() timing
Input config file /home/users/fan/.mplayer/input.conf parsed : 50 binds

Playing mr.avi
Cache fill:  0.00% (0 bytes)    Detected AVI file format!
VIDEO:  [DIVX]  512x384  24bpp  25.00 fps  998.8 kbps (121.9 kbyte/s)
Clip info: 
 Software: MEncoder 0.90pre7-2.95.3
==========================================================================
Detected audio codec: [a52] afm:liba52 (AC3-liba52)
Opening audio decoder: [liba52] AC3 decoding with liba52
AC3: 2.0 (stereo)  48000 Hz  192.0 kbit/s
AUDIO: 48000 Hz, 2 ch, sfmt: 0x10 (2 bps), ratio: 24000->192000 (192.0 kbit)
vo: X11 running at 1024x768 with depth 16 and 16 bpp (":0.0" => local display)
Opening video filter: [pp]
==========================================================================
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
Detected video codec: [ffodivx] vfm:ffmpeg (FFmpeg MPEG-4)
==========================================================================
Video attribute 'brightness' isn't supported by selected vo & vd!
AO: [oss] 48000Hz 2ch Signed 16-bit (Little-Endian)
Start playing...
VDec: vo config request - 512 x 384 (preferred csp: Planar YV12)
[PP] Using external postprocessing filter, max q = 6
VDec: using Planar YV12 as output csp (no 0)
Movie-Aspect is undefined - no prescaling applied.
VO: [xv] 512x384 => 512x384 Planar YV12  [fs]

System info:
============

FreeBSD damocles.olimpus 4.6-RC2 FreeBSD 4.6-RC2 #0: Wed May 22 21:01:00 CEST 2002     
root at damocles.olimpus:/usr/obj/usr/src/sys/NUCLEO  i386

        /----/

-r--r--r--  1 root  wheel  1222232 22 may 22:13 /usr/lib/libc.a
lrwxr-xr-x  1 root  wheel        9 22 may 22:13 /usr/lib/libc.so -> libc.so.4
-r--r--r--  1 root  wheel   579412 22 may 22:13 /usr/lib/libc.so.4

        /----/

XFree86 Version 4.2.0 / X Window System
(protocol Version 11, revision 0, vendor release 6600)
Release Date: 18 January 2002
        If the server is older than 6-12 months, or if your card is
        newer than the above date, look for a newer version before
        reporting problems.  (See http://www.XFree86.Org/)
Build Operating System: FreeBSD 4.4-RELEASE-p1 i386 [ELF]
Module Loader present
Note: (I'm using the last gatos driver)

        /----/

gcc --version
2.95.3

        /----/

GNU ld version 2.11.2 20010719 [FreeBSD] (with BFD 2.11.2 20010719 [FreeBSD])

        /----/

GNU assembler 2.11.2 20010719 [FreeBSD]
Copyright 2001 Free Software Foundation, Inc.
This program is free software; you may redistribute it under the terms of
the GNU General Public License.  This program has absolutely no warranty.
This assembler was configured for a target of `i386-unknown-freebsd4'.

        /----/

Linux proc emulation (K7 T-bird 1,4):
cat /linprocfs/cpuinfo
processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 6
model           : 7
stepping        : 4
flags           : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat pse36 mmx fxsr
cpu MHz         : 1410.21
bogomips        : 1410.21

        /----/

Video Chipset ATI Rage 128 Pro PF (AGP) 

        /----/

FreeBSD Audio Driver (newpcm)
Installed devices:
pcm0: <VIA VT82C686A> at io 0xa800 irq 5 (1p/1r/0v channels duplex)

-- 
-----BEGIN GEEK CODE BLOCK-----
Version: 3.1
GCS/IT d- s+:+() a- C+++ UBL+++$ P+ L+++ E--- W++ N+ o++ K- w---
O+ M+ V- PS+ PE+ Y++ PGP+>+++ t+ 5 X+$ R- tv-- b+++ DI D++>+++
G++ e- h+(++) !r !z
------END GEEK CODE BLOCK------