[mythtv] Adding support for external ffmpeg-mt library

[Marc Tousignant]

> I'm preparing right now the next ffmpeg sync. current patch is
> http://www.grunau.be/mythtv_20788_ffmpeg_sync_19327.patch.bz2

<snip>

> Janne
> _______________________________________________

Janne,

Would this patch be required on both the FE and BE? Or can I do it on a the
frontend only?
Both my cards capture raw mpeg so there is no conversion.

Marc