Converting from Flash .flv format to iPod Compatible .mp4 format in ffmpegX

[bananasontoast]

I am trying to convert .flv files downloaded from youtube.com / megavideo.com etc. into iPod compatible .mp4 movies using ffmpegX on OS X. Unfortunately every time I try and convert them it seems to work for about a minute and then suddenly produces an empty .flv file and says it is complete.

Here are the details of the conversion...

Source Format

• From: flv

• Video: flv, yuv420p, 424x240

• Audio: mp3, 22050 Hz, stereo

Target Format

• To: mp4

• Video: ffmpeg mpeg4, 432x240, 548 kbps, 23.976 fps, no crop

• Audio: aac, 48000 Hz, 96 kbps

And finally, this is the output after running the conversion and clicking the i button...

FFmpeg version CVS, Copyright (c) 2000-2004 Fabrice Bellard
Sun Jan  4 00:49:38 EST 2009
Mac OSX universal build for ffmpegX
  libavutil version: 49.0.0
  libavcodec version: 51.9.0
  libavformat version: 50.4.0
Seems that stream 1 comes from film source: 1000.00 (1000/1) -> 23.98 (24000/1001)
Input #0, flv, from '/Users/mitch/Desktop/Dexter/303.flv':
  Duration: 00:48:10.9, bitrate: N/A
  Stream #0.0: Audio: mp3, 22050 Hz, stereo
  Stream #0.1, 23.98 fps(r): Video: flv, yuv420p, 424x240
Codec type mismatch for mapping #0.0 -> #0.0

[Case]

Codec type mismatch for mapping #0.0 -> #0.0

Tick the Invert mapping checkbox in the audio tab, and try again.

(This informs ffmpeg that stream #0.1 should be converted to video, and that stream #0.0 should be converted to audio. The "Codec type mismatch" happens when it tries to convert audio to video, which will fail for obvious reasons.)