[mythtv] Mediacodec problem with avcodec_flush_buffers

[David Engel]

On Fri, Jul 27, 2018 at 08:09:36AM -0400, Peter Bennett wrote:
> I think it is only with deinterlace. It may also happen with h264 interlaced
> content. I do not have much h264 interlaced content to test with.

I have at least one, 1080i, h264 channel.  I can check it tonight.

David

> On 07/26/2018 02:28 PM, Aman Gupta wrote:
> > Did some tests and it looks like it's mpeg2 issue only.
> > 
> > I forwarded your screenshot to my contact at Nvidia who has filed an
> > issue with their media team.
> > 
> > Aman
> > 
> > On Thu, Jul 26, 2018 at 9:41 AM Aman Gupta <aman at tmm1.net
> > <mailto:aman at tmm1.net>> wrote:
> > 
> >     Is it happening with h264 too, or mpeg2 only?
> > 
> >     Aman
> > 
> >     On Thu, Jul 26, 2018 at 8:43 AM Aman Gupta <aman at tmm1.net
> >     <mailto:aman at tmm1.net>> wrote:
> > 
> >         On Thu, Jul 26, 2018 at 8:18 AM Peter Bennett
> >         <pb.mythtv at gmail.com <mailto:pb.mythtv at gmail.com>> wrote:
> > 
> >             Hi Aman
> > 
> >             When doing a skip forward in playback, we use
> >             avcodec_flush_buffers and
> >             then start processing from a different part of the file.
> >             We then receive
> >             a couple of frames from the new location and then one
> >             which contains
> >             part of a frame from before the flush and part of a new
> >             frame. There is
> >             a diagonal jagged line across the middle. Above the jagged
> >             line is part
> >             of an image after the flush. Below the line is part of an
> >             image before
> >             the flush. This produces a noticeable irritating flash on
> >             the screen.
> > 
> >             In this case the second frame after the flush was
> >             corrupted this way. It
> >             is not consistent, sometimes the third frame, sometimes a
> >             later one. I
> >             tried to compensate by dropping some frames after a flush
> >             but it is
> >             problematic because it is inconsistent.
> > 
> >             This link is a photograph of the screen when I stopped it
> >             during playback.
> >             https://www.dropbox.com/s/rxub9otpwuop3t9/IMG_20180709_173348703.jpg?dl=0
> > 
> > 
> >         I have seen this too. It started when the shield updated to
> >         Oreo. I'm not sure there's anything we can do about it besides
> >         reporting to Nvidia.
> > 
> >         Aman
> > 
> > 
> >             I have other pictures from before and after the bad one if
> >             you need them.
> > 
> >             Peter
> > 
> > 
> 

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-- 
David Engel
david at istwok.net