Problem converting h264 to FLV

[Andrea_Barghigiani]

Hi guys, I am not an expert user in this field, I've started to use ffmpeg to convert few videotutorial that I am building for my blog. The problem here is that I am not able to convert a video with the h264 codec to a flv file...

This is my log, but as said earlier, I do not understand at all what that means, so could you be so kind to help me understanding why I am not able to convert an h264 to a flv?

Encoding started on Wed Mar 30 16:46:47 CEST 2011
FFmpeg version CVS, Copyright (c) 2000-2004 Fabrice Bellard
Mac OSX universal build for ffmpegX
  libavutil version: 49.0.0
  libavcodec version: 51.9.0
  libavformat version: 50.4.0
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/Volumes/Dati/WebDesign/Lavori/Freelance/HTML5andMore/Video/HTML5 Forms.mp4':
  Duration: 00:12:31.9, start: 0.000000, bitrate: 312 kb/s
  Stream #0.0(und), 29.97 fps(r): Video: h264, yuv420p, 1280x800
  Stream #0.1(und): Audio: aac, 48000 Hz, stereo
Output #0, flv, to '/Volumes/Dati/WebDesign/Lavori/Freelance/HTML5andMore/Video/HTML5 Forms.mp4.ff.flv':
  Stream #0.0, 12.00 fps(c): Video: flv, yuv420p, 1280x720, q=2-15, 200 kb/s
  Stream #0.1: Audio: ac3, 22050 Hz, stereo, 56 kb/s
Stream mapping:
  Stream #0.0 -> #0.0
  Stream #0.1 -> #0.1
bench: utime=0.011s
codec not compatible with flv
Could not write header for output file #0 (incorrect codec parameters ?)
ERROR: undefined method `timestamp' for nil:NilClass
ERROR: /Library/Ruby/Site/1.8/flv/stream.rb:285:in `lasttimestamp'
ERROR: /Library/Ruby/Site/1.8/flv/stream.rb:274:in `duration'
ERROR: /Library/Ruby/Site/1.8/flvtool2/base.rb:181:in `add_meta_data_tag'
ERROR: /Library/Ruby/Site/1.8/flvtool2/base.rb:137:in `update'
ERROR: /Library/Ruby/Site/1.8/flvtool2/base.rb:47:in `send'
ERROR: /Library/Ruby/Site/1.8/flvtool2/base.rb:47:in `execute!'
ERROR: /Library/Ruby/Site/1.8/flvtool2/base.rb:46:in `each'
ERROR: /Library/Ruby/Site/1.8/flvtool2/base.rb:46:in `execute!'
ERROR: /Library/Ruby/Site/1.8/flvtool2/base.rb:239:in `process_files'
ERROR: /Library/Ruby/Site/1.8/flvtool2/base.rb:225:in `each'
ERROR: /Library/Ruby/Site/1.8/flvtool2/base.rb:225:in `process_files'
ERROR: /Library/Ruby/Site/1.8/flvtool2/base.rb:44:in `execute!'
ERROR: /Library/Ruby/Site/1.8/flvtool2.rb:168:in `execute!'
ERROR: /Library/Ruby/Site/1.8/flvtool2.rb:228
ERROR: /Applications/ffmpegX.app//Contents/Resources/flvtool2:2:in `require'
ERROR: /Applications/ffmpegX.app//Contents/Resources/flvtool2:2
Encoding completed on Wed Mar 30 16:46:48 CEST 2011

Thanks for your help! Which are the correct codec parameters?

[Baldrick]

Mp4 with h264 video and aac works fine in flash. So you don't need to reconvert to a flv container. Have you tried it?

[Andrea_Barghigiani]

The inpout source is a h264 with a acc audio, but I still have this error... Or maybe there's something that I'm missing?

[poisondeathray]

Why do you need to convert it? It should already be compatible. If you want to re-wrap into flv container

ffmpeg -i input.mp4 -vcodec copy -acodec copy output.flv