New submission from Jacques <jacques.h...@credit-suisse.com>:
Hi there,
Overview: Encoding AC3 5.1 is broken when selecting all 6 channels. AC3
stereo encoding works fine.
SVN Rel: 20371
Config: --prefix=/app/local --extra-cflags=-I/app/local/include
--extra-ldflags=-L/app/local/lib --enable-gpl --
enable-libxvid --enable-pthreads --enable-libmp3lame --enable-libvorbis
--enable-libfaac --enable-libfaad --enable-
nonfree --enable-shared
Descr: I've tested this on several VOBs. FFMPEG encodes stereo AC3 streams
correctly, but not 5.1 channels. The
audio stream gets tagged as "Uncompressed PCM" and the FourCC code is the
corresponding 0xfffe tag. It should be
"AC3-A52" tagged as 0x2000.
Cmd and output:
##########################################################
# ffmpeg -v 9 -loglevel 99 -y -t 00:00:10 -i file.vob -vcodec libxvid -b 2000k
-acodec ac3 -ac 6 -ab 448k -f avi
out.avi
FFmpeg version SVN-r20371, Copyright (c) 2000-2009 Fabrice Bellard, et al.
built on Oct 25 2009 20:26:03 with gcc 4.1.2 20080704 (Red Hat 4.1.2-46)
configuration: --prefix=/app/local --extra-cflags=-I/app/local/include
--extra-ldflags=-L/app/local/lib --enable-
gpl --enable-libxvid --enable-pthreads --enable-libmp3lame --enable-libvorbis
--enable-libfaac --enable-libfaad --
enable-nonfree --enable-shared
libavutil 50. 3. 0 / 50. 3. 0
libavcodec 52.37. 1 / 52.37. 1
libavformat 52.39. 2 / 52.39. 2
libavdevice 52. 2. 0 / 52. 2. 0
libswscale 0. 7. 1 / 0. 7. 1
[NULL @ 0x1d8543c0]Probed with size=8192 and score=52
[mpeg @ 0x1d8543c0]Probe with size=2012, packets=1 detected mpegvideo with
score=25
[mpeg @ 0x1d8543c0]max_analyze_duration reached
Seems stream 0 codec frame rate differs from container frame rate: 50.00 (50/1)
-> 25.00 (25/1)
Input #0, mpeg, from 'file.vob':
Duration: N/A, start: 0.287267, bitrate: N/A
Stream #0.0[0x1e0], 1/90000: Video: mpeg2video, yuv420p, 720x576 [PAR 16:15
DAR 4:3], 1/50, 9800 kb/s, 25 tbr,
90k tbn, 50 tbc
Stream #0.1[0x80], 1/90000: Audio: ac3, 48000 Hz, 5.1, s16, 448 kb/s
Stream #0.2[0x81], 1/90000: Audio: ac3, 48000 Hz, stereo, s16, 192 kb/s
Stream #0.3[0x82], 1/90000: Audio: ac3, 48000 Hz, 5.1, s16, 384 kb/s
Output #0, avi, to 'out.avi':
Stream #0.0, 1/25: Video: libxvid, yuv420p, 720x576 [PAR 16:15 DAR 4:3],
1/25, q=2-31, 2000 kb/s, 25 tbn, 25 tbc
Stream #0.1, 4/125: Audio: ac3, 48000 Hz, 5.1, s16, 448 kb/s
Stream mapping:
Stream #0.0 -> #0.0
Stream #0.1 -> #0.1
Press [q] to stop encoding
frame= 258 fps= 21 q=2.0 Lsize= 2459kB time=10.02 bitrate=2011.1kbits/s
dup=0 drop=0
video:1888kB audio:548kB global headers:0kB muxing overhead 0.955214%
##############################################################################
Media players like VLC, complains about the audio stream (also checked in GSpot
and VideoSpec). If the above cmd
only encodes 2 channels on stream 0.1 (-ac 2) it's fine.
I've attached the out.avi vid.
Cheers,
Jacques
File 'out.avi' not attached - you can download it from
https://roundup.ffmpeg.org/roundup/ffmpeg/file585.
----------
files: out.avi
messages: 7622
priority: normal
status: new
substatus: new
title: AC3 5.1 breaks ffmpeg
type: bug
_____________________________________________________
FFmpeg issue tracker <iss...@roundup.ffmpeg.org>
<https://roundup.ffmpeg.org/roundup/ffmpeg/issue1498>
_____________________________________________________
