[FFmpeg-devel] MainConcept mpeg not decoding properly.

[Media Streaming Services]

On Jan 11, 2008 5:02 PM, M?ns Rullg?rd <mans at mansr.com> wrote:
> 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.
>

Oh yes, it decodes video and audio track fine, just not reading them
at the same duration.
The clip is 2:20 but video is generated as 3:28.666 sec track (666...
it has to be it :)


* Movie Info *
        Timescale 1000 - Duration 00:03:28.667
        Fragmented File no - 2 track(s)
        File Brand 3gp4 - version 512
        Created: GMT Fri Jan  2 00:00:00 1970

File has no MPEG4 IOD/OD

Track # 1 Info - TrackID 1 - TimeScale 12 - Duration 00:03:28.666
Media Info: Language "Undetermined" - Type "vide:mp4v" - 2504 samples
MPEG-4 Config: Visual Stream - ObjectTypeIndication 0x20
MPEG-4 Visual Size 176 x 144 - Simple Profile @ Level 1
Pixel Aspect Ratio 12:11 - Indicated track size 192 x 144
Self-synchronized

Track # 2 Info - TrackID 2 - TimeScale 8000 - Duration 00:02:20.840
Media Info: Language "Undetermined" - Type "soun:samr" - 7042 samples
        3GPP AMR stream - Sample Rate 8000 - 2 channel(s) 16 bits per samples




Dennis.