I just downloaded EZVID and when I upload a video, I don't get any audio.
This happens because of the codec used by the application. Try to install a codec pack or simply install XviD. Then you need configure the application to use the Xvid or the codecs from the CCCP instead of the default one. However, on YouTube you need to wait a little before the sound appears. In most cases this happens because of the processing time.