[mythtv] YV12 problem

David Engel david at istwok.net
Thu Dec 13 03:10:52 UTC 2018

On Wed, Dec 12, 2018 at 12:48:08PM -0500, Peter Bennett wrote:
> On 12/12/18 1:26 AM, David Engel wrote:
> > I tested on my second generation firetv stick and first generation
> > firetv tonight with and without the reversio patch.  I saw no jaggies
> > whatsoever.
> The jaggies occur on the right hand half of the picture. They may not be
> noticeable depending on the content you are watching. This happens in 1080i
> and 720p, but they are more visible in 720p content. The right hand one
> third or one half of the screen has half resolution, due to insufficient
> precision in opengl es when applying the luminance via the shader.
> Please try this video and look at the fox sports logo. I am using fire stick
> 2g. This is progressive 720p content, and I use mediacodec decoding.
> https://www.dropbox.com/s/e98zdwdgnpt5vav/panning.ts?dl=0

I saw them tonight.  Yeah, that's not nice.

I'm still not sure the stick 2g is a good choice for MythTV.  Maybe
when the video path is all in the GPU but not right now.


> > The firetv 1g was quite usable but moreso with mediacodec decoding.
> > With ffmpeg decoding of mpeg2 video, 720p was fine but 1080i needed
> > bob or one-field deinterlacing to not stutter.
> > 
> > The firetv stick 2g wasn't as nice.  I couldn't find any combination
> > of setting that didn't stutter.  That's in line with what I've heard
> > and read about all firetv stick pre-4k -- they just aren't powerful
> > enought for MythTV.
> > 
> Fire stick 2g has jerky movement due to a reduced frame rate (many frames
> are dropped). The audio is smooth without interruption, audio video sync is
> fine and playback keeps up. There are some people who are happy to watch it
> this way, although I would not like the jerky movement. I would rather not
> add jaggies to the mix if possible.
> I use the video, advanced, avsync2, standard decoding for mpeg2 with linear
> blend deinterlace, and mediacodec for non-mpeg2.
> Peter

David Engel
david at istwok.net

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