tsdemux: always conciders mpeg audio ADTS as mpegversion=2
Submitted by Thibault Saunier
According to tsdemux code, mpeg audio with stream-format=adts will always have mpegversion=2, but aacparse says it can also be mpegversion=4.
For example, on that file: https://dl.dropboxusercontent.com/u/2804070/tron_en_ge_aac_h264.ts tsdemux conciders the stream as being mpegversion=2 but aacparse will change that to being mpegversion=4.
It will not cause much issue in practice but running gst-discoverer on that sample will tell us that the file contains 4 audio tracks 2 with mpegtsversion=2 and 2 other with 4 which is clearly wrong.
I am attaching a patch where we just do not set the version at the demuxer level and let the parser do it, I am not sure it is really correct but as parser are now mandatory it works.
Otherwize we should just parse further in the demuxer to get that info.