As I understand it, the Shield has hardware decoding for VC-1 streams available. However, when transcoding a VC-1 to h264 performance is poor (seems to be just a touch under 1x transcoding speed) and it suffers further if it is burning in subtitles.
Where is the bottle neck on this? I assume it must be on the decoding side, since other transcodes to h264 work just fine. Is PMS on Shield using hardware acceleration for VC-1 to h264 transcodes at all? If not, is it a limitation of the hardware or just something that hasn't been implemented yet?