data: Disable avc and aac transcoder
data: Disable avc and aac transcoder

Rygel code is good, but GStreamer seems to have some issues still:

 - AAC transcoder doesn't preroll due to 3GPP container apparently.
 - AVC transcoder creates invalid mp4 container.

Tarnyko/rygel,Tarnyko/rygel,Pelagicore/Media-Manager-Rygel-patched,jku/rygel,jku/rygel,GNOME/rygel,GNOME/rygel,Pelagicore/Media-Manager-Rygel-patched,GNOME/rygel,Pelagicore/Media-Manager-Rygel-patched