[nzlug] 3GP File Conversion

[Vik Olliver]

On Wed, 2007-04-11 at 09:34 +1000, Daniel Pittman wrote:
> ffmpeg.sf.net -- the ffmpeg tools definitely support 3GP, though you may
> need to compile it yourself or something crazy like that.  I don't know
> the patent and distribution status of the 3GP audio processor.

ffmpeg was the first port of call. Does most things for me but not this.
Seems to have a bee in its bonnet about frame rate conversion:

ffmpeg -i MOV00002.3gp bottle_rocket_kids.mpeg
ffmpeg version CVS, build 3276800, Copyright (c) 2000-2004 Fabrice
Bellard
  configuration:  --extra-cflags=-fomit-frame-pointer
-DRUNTIME_CPUDETECT --build i486-linux-gnu --enable-gpl --enable-pp
--enable-zlib --enable-vorbis --enable-libogg --enable-theora
--enable-a52 --enable-dts --enable-dc1394 --enable-libgsm
--disable-debug --prefix=/usr
  built on Nov 24 2005 10:19:02, gcc: 4.0.3 20051121 (prerelease)
(Ubuntu 4.0.2-4ubuntu3)

Seems that stream 0 comes from film source: 1000.00 (1000/1) -> 12.08
(157/13)
Input #0, mov,mp4,m4a,3gp,3g2, from 'MOV00002.3gp':
  Duration: 00:00:57.2, start: 0.000000, bitrate: 226 kb/s
  Stream #0.0: Video: h263, yuv420p, 176x144, 1000.00 fps
  Stream #0.1: Audio: samr / 0x726D6173, 8000 Hz, mono
Output #0, mpeg, to 'bottle_rocket_kids.mpeg':
  Stream #0.0: Video: mpeg1video, yuv420p, 176x144, 12.00 fps, q=2-31,
200 kb/s
  Stream #0.1: Audio: mp2, 8000 Hz, mono, 64 kb/s
Stream mapping:
  Stream #0.0 -> #0.0
  Stream #0.1 -> #0.1
[mpeg1video @ 0x8336308]MPEG1/2 does not support 12/1 fps
Error while opening codec for output stream #0.0 - maybe incorrect
parameters such as bit_rate, rate, width or height

I tried adding -re to use native frame rate but no joy.

Vik :v)
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