[mythtv-users] Fwd: Re: V31 High Quality Software Deinterlacing (not fixed)

John Pilkington johnpilk222 at gmail.com
Mon Mar 30 20:42:02 UTC 2020

On 30/03/2020 20:16, jksjdevelop wrote:
> On 29/03/2020 13:20, John Pilkington wrote:
>> On 29/03/2020 12:21, John wrote:
>>> since updating from v31-Pre-1967-gc3d433f7a2 to v31-Pre-2036-g76fedd7758
>>> High quality software de-interlacing is causing me audio sync issues
>>> Using the same settings for video profile ie just changing the 
>>> version of mythtv - not touching the profile
>>> v31-Pre-1967-gc3d433f7a2
>>>   mythvideoout.cpp:393 (SetDeinterlacing) VideoOutput: 
>>> SetDeinterlacing (Doublerate 1): Single High|CPU|GLSL Double High|CPU
>>> v31-Pre-2036-g76fedd7758
>>> mythvideoout.cpp:393 (SetDeinterlacing) VideoOutput: SetDeinterlacing 
>>> (Doublerate 1): Single High|CPU|GLSL|DRIVER Double High|CPU|GLSL|DRIVER
>>> How do I get the newer version to use Single High|CPU|GLSL Double 
>>> High|CPU which works.
>>> By the same token how do you return a video profile to default. ie if 
>>> you delete all custom settings does it return to default or just stop 
>>> working.
>> I suppose the trouble there is that 'default' has been changing - 
>> frequently; the code will define it at each stage, and if you want 
>> something different you need to use the setup options (?)
> Thanks for the response. I fixed it by clearing the Prefer OpenGL 
> deinterlacers check box.
> This gave me
> mythvideoout.cpp:393 (SetDeinterlacing) VideoOutput: SetDeinterlacing 
> (Doublerate 1): Single High|CPU Double High|CPU
> which works great.
> I have no idea whether I have set that flag myself or if its the default 
> setting in the OpenGL High Quality profile, hence my query on how to get 
> one of these provided profiles back to its defaults.
> ==================
> Update - seemed OK but isnt, Audio sync can randomly go completely out 
> by several seconds.
> Have to go back to VDPAU which unfortunately has panning issues on some 
> low bit rate HD channels.

I haven't noticed sync problems recently with normal decoding in master, 
but usually this box is SD only; 2 x 2.6 GHz cpus, OpenGL YV12, both 
deinterlacer rates medium quality with other boxes unticked.  Typing 
emails with the setup screen potentially active is risky!

ISTR that sync issues happen when frames have to be dropped because of 
high cpu load.

For a long time I have reported panning issues in HD but no-one else 
seemed to have them.  4-core 3 GHz ffmpeg more-or-less fixed it, or the 
leanfront Firestick 4K (which demands non-interlaced input) or DLNA.

John P

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