How to best convert Flash compatible mp4 files wit

Question

I am trying to convert different files to a flash compatible .mp4 file with ffmpeg, but I can't seem to get it to work. Of course the objective is to get the greatest quality with the smallest file size.

So far I have this, which works, but it doesn't play in a flash player for some reason. The result isn't that great, how can I improve this conversion?

This is the command I'm using:

ffmpeg -i input.file -f mp4 -vcodec mpeg4 -r 25 -b 560000 -s 610x340 -acodec aac -ac 2 -ab 64 -ar 44100 output.file

Answer 1

Just some ideas of why this might happen

• mp4 is only supported in flash 9.0.115.0 or higher, what version are you using?
• does the webserver hosting the file have the mp4 mime type setup?

does it play when converting to FLV and is that an option? You would then use something like the following options

ffmpeg -i input.file -f flv -r 25 -b 560000 -s 610x340 -acodec mp3 -ac 2 -ab 64 -ar 44100 output.file

Answer 2

If you're using ffmpeg to make .mp4s, look in the ffpresets/ directory and use -vpre. The default options (for all codecs, but especially libx264) are very bad and practically all of them should be set to something custom. -vpre takes care of most of it for x264.