Mythtv and 3gp
12-20-2005

Here is a little script for converting Mythtv mpeg nuv files
to a 3gp video file. This requires mplayer and a slightly 
modified ffmpeg. Everything here has been tested on Fedora 
Core 4 and a Nokia 6230 cellphone. Also, these instructions
are quite sparse, so you may need to fine tune them to match
your setup/needs.

1) Download mplayer. Verify you have the mplayer and memcoder binaries.

2) Download the ffmpeg source code. You can grab it from the CVS:

   cvs -z9 -d:pserver:anonymous@mplayerhq.hu:/cvsroot/ffmpeg co ffmpeg

3) cd into ffmpeg and set it to compile in adaptive multi-rate (AMR) audio:

   ./configure --enable-amr_nb

   You should see a message about downloading the correct AMR package from:

   AMR source

   In my case, I downloaded 26104-510 float package.

4) cd into libavcodec/ and create the appropriate AMR subdirectory:

   mkdir amr_float

   cd into the new directory and unzip the AMR source code
   (its zipped twice). Move the makefile inplace as well:

   cp makefile.gcc makefile

5) cd back out to ffmpeg/ and compile:

   make

   If you run into errors, your probably missing libraries. Go ahead 
   and install these libraries and recompile.

6) Install the new custom AMR ffmpeg binary:

   cp ffmpeg /usr/local/bin/ffmpeg3gp

7) Download this simple conversion script:

   myth3gp

8) Run the script as follows:

   myth3gp /data/video/1062_20050804001500_20050804003000.nuv athf_cloning

   When complete, it will generate a 3gp file, as above: athf_cloning.3gp.

Your done, transfer the file to your favorite video supported cell phone.

Some cellphones dont support seeking, so it may be wise to cut the video up
into smaller pieces and use them like chapters. Also, the above script can
be used as a MythTV job, so you can convert to 3gp automatically or trigger
it via the frontend.

(note that audiodump.wav can be overwritten when converting more than one
video at the same time...)

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