found a good tutorial by Aaron Gadberry on using ffmpeg from a php backend.
from the site
After that install process is over, you will need to test ffmpeg. The executable should be installed to /usr/bin/ffmpeg. To test it, just run /usr/bin/ffmpeg -version and check that the output has no errors. Then run a simple, short audio [...]
found a good tutorial by Aaron Gadberry on using ffmpeg from a php backend.
from the site
After that install process is over, you will need to test ffmpeg. The executable should be installed to /usr/bin/ffmpeg. To test it, just run /usr/bin/ffmpeg -version and check that the output has no errors. Then run a simple, short audio file through it. Upload it via ftp, then run ffmpeg on it. Look lower for an explanation of args.
Next you will need to create a web form with the ability to upload a file. This isn’t particularly difficult, an example is below.