[FFmpeg-devel] MainConcept mpeg not decoding properly.

[Måns Rullgård]

Michael Niedermayer <michaelni at gmx.at> writes:

> On Fri, Jan 11, 2008 at 12:03:05PM -0500, Media Streaming Services wrote:
>> Hi all.
>> 
>> I'm trying to encode mpg to 3gp and have problems with the source file.
>> Audio track is encoded as 140 seconds and video is 206 seconds...
>> 
>> http://rapidshare.com/files/82302675/DA_117588fd522.mpg.html
>> I've tried uploading to mplayer's ftp, but the file gets deleted soon
>> after I finish uploading.
>> 
>> it's a MainConcept muxed mpeg2-ps. Plays fin in Windows graphedit&WMP using
>> Mainconcept demuxer.
>> 
>> I have tried -vcodec h264, -acodec liba52, -f mpeg, -f svd, -f dvd,
>> -async 1, -vsync 1... all produce bad files, asynch had actually
>> produced file with equal video and audio length, but audio got
>> "chopped up". Is it a bug? Or am I doing something wrong?
>> 
>> /usr/local/bin/ffmpeg -f dvd -vcodec h264 -i DA_117588fd522.mpg
>> -bitexact 1 -vcodec mpeg4 -deinterlace -s 176x144 -r 12 -b 92k -nr 1
>> -preme 1 -bt 100k  -lowres 1 -trell 1 -maxrate 110k -bufsize 256k -vol
>> 400  -acodec libamr_nb -ac 1 -ar 8000 -ab 12.2k -y -pass 2 9.3gp
>
> please provide a minimum command line to reproduce it and full uncut
> output of ffmpeg

Here's what I used:

$ ffmpeg -i DA_117588fd522.mpg -an -f image2 foo/%03d.png
FFmpeg version git-55839b7, Copyright (c) 2000-2008 Fabrice Bellard, et al.
  configuration: --cc=gcc-4.2.2 --cpu=nocona --enable-gpl
  libavutil version: 49.6.0
  libavcodec version: 51.49.0
  libavformat version: 52.3.0
  libavdevice version: 52.0.0
  built on Jan 11 2008 21:38:35, gcc: 4.2.2 (Gentoo 4.2.2 p1.0)
Input #0, mpeg, from 'DA_117588fd522.mpg':
  Duration: 00:02:20.8, start: 1.830000, bitrate: 1702 kb/s
    Stream #0.0[0x1e0]: Video: h264, yuv420p, 320x240 [PAR 1:1 DAR 4:3], 25.00 tb(r)
    Stream #0.1[0x1c0]: Audio: mp2, 44100 Hz, stereo, 192 kb/s
Output #0, image2, to 'foo/%03d.png':
    Stream #0.0: Video: png, rgb24, 320x240 [PAR 1:1 DAR 4:3], q=2-31, 200 kb/s, 25.00 tb(c)
Stream mapping:
  Stream #0.0 -> #0.0
Press [q] to stop encoding
frame=  994 fps= 74 q=0.0 Lsize=      -0kB time=39.8 bitrate=  -0.0kbits/s    
video:18797kB audio:0kB global headers:0kB muxing overhead -100.000114%

FWIW, the file plays fine with tcvp using its demuxer and lavc
decoder.

-- 
M?ns Rullg?rd
mans at mansr.com