[mythtv] AVSync in master, Normal decoding, vga monitor and built-in audio analog stereo

[John Pilkington]

> On 13/12/2019 08:21, Mark Kendall wrote:

>> There is one potential 'gotcha' that probably applies to your systems
>> (as you are using predominantly software decoding).
>>
>> With the conversion to use FFmpeg for deinterlacing, you may see
>> higher load with the medium and high quality deinterlacers. While I
>> would expect the low quality (onefield/bob) to be comparable to the
>> old mythtv equivalent filter, the medium uses yadif and the high
>> quality bwdif. The equivalent medium to high versions previously would
>> have been something like linearblend and yadif. This is because
>> FFmpeg/libavfilter doesn't offer anything that fits into the 'medium'
>> quality bracket - so I had to make do.
>>
>> Regards
>> Mark
> 
> Thanks Mark:  The el7 system is now on 4fddad7097e, and sync seems to be 
> subjectively ok on the SD material that I have played on it.  -v 
> playback AV Sync is usually around 25 ms, either ahead or behind, and 
> frames are still being dropped. It may be that the opposite isn't 
> logged.  MPEG-2 ffmpeg, 2x CPU onefield.  CPU around 2x 90% with the OSD 
> active, slightly lower without.

The last commit in that build was to 'fix deinterlacer changes when 
changing speed', so I tried playing at 130% and 70%.  With both, the CPU 
load shown in the OSD was significantly less than when playing at normal 
speed.  Strange.  The sync was ok.

John