Add vpx (de)muxing capabilities to mpegtsmux and mpegtsdemux

Submitted by Yann Jouanin

Link to original bug (#776948)

Description

Created attachment 343024
Patch to add vpx support to both mpegtsmux and mpegtsdemux

It is currently impossible to stream vpx codec with MPEG-TS muxer (demuxer).
This patch add this functionnality by creating a new stream type (private 0xe0) and a descriptor.

tested with vp8 and vp9

Patch 343024, "Patch to add vpx support to both mpegtsmux and mpegtsdemux":
0001-mpegtsmux-add-support-for-vpx-streams.patch