ogv to mp4 without codec

This is a great trick, in fact yesterday it saved my life, I had an ogv file generated by gtk-recordmydesktop and I need to convert it to a mp4 file because the user do es not use GNU/Linux, so here it is the command line:

ffmpeg -i firstfile.ogv libx264 -vpre medium -crf 24 -threads 0 -acodec copy secondfile.mp4

As you can see we don't use any codec to export the format and this is really great - and faster- in order to get your file.

I read some howtos using codec such as libfaac but honestly it is not as quick as I need it, the result file was ok, I did not loose video quality and the audio was like the source one.

hope to help

Best