[mythtv] Redone FFmpeg 4.4.1

[John Pilkington]

On 01/12/2021 21:52, John Pilkington wrote:

> But the mux of my 'local' DVB-T station sometimes uses an mpeg2 format 
> with "field_order=bb", and on skipping that shows bad blocking.  Also, 
> in the editor, it sometimes shows two frames interleaved; one is linked 
> to the cursor and one is static.  That's using the settings above.
> 
> I know this station's format has given me trouble in the past and 
> suspect that what I'm seeing now may not be related to the current 
> resync.  It might, however, throw light on my occasional 20-second 
> hangups in the editor.
> 
> And I've just seen Peter's comment about this:  use standard decoding. 
> ISTR asking Mark long ago about auto-switching of profile. That can be 
> done by format, but here it would ideally be a playback vs edit switch. :-(

Since I aired this here I'll add a comment:  The original seektable says 
it's 50 fps.  Regenerating that (mythcommflag --rebuild) gives 25 fps.

VDPAU gives blocking; NVDEC and Standard don't, and playback is good. 
This isn't a new 4.4.1 feature.
> 
> John P
>