[mythtv] MythCodecContext: 2 concurrent hardware frames contexts

[John Pilkington]

Hi Mark:  This is v32.Pre.3 a83c0d in F30 with a new nVidia update: 
440.59 playing SD or HD.

The next line is 'cuda frames context finished' and segfaults have 
followed.  Would you like logs?  I haven't looked for other settings.

Thanks,

John