[mythtv] #13186 - Replace deprecated ffmpeg functions - so far so good!

[Piotr Oniszczuk]

> 
> I haven't done comprehensive tests but I have seen no problems and navigation of my MythArchive DVD products is much improved. I don't know how it has been in non-master.  Ref #12955
> 
Right. I can confirm: with Peter’s code, dvd issue with lacking dvd menu selection highlight when user walks on menu gone.
now it works perfectly!