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flickering playback of live tv

Any issues that are tvOS specific
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spmcewen
Posts: 31
Joined: 24 Dec 2015, 22:36

flickering playback of live tv

Post by spmcewen » 04 Feb 2018, 13:54

Hello - I have an Apple TV 4 and and Apple TV 4k (with tvOS frame rate matching enabled). I run MythTV with an HD Homerun tuner and use MrMC as the front end. Recently I noticed that both Apple TVs flicker during commercials when watching live tv. Most of the time the show itself is fine but when it goes to a commercial the flickering is obvious.

Do you have any thoughts what could be causing this? I thought at first that it had to do with the new frame rate matching option on the 4k but then noticed it also happening on the older Apple TV 4th gen connected to a different TV.

Thanks

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davilla
Team MrMC
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Joined: 26 Oct 2015, 17:01

Re: flickering playback of live tv

Post by davilla » 04 Feb 2018, 15:20

'flickering' could be anything including us not understanding what you mean :) Be descriptive and include a debuglog please.

spmcewen
Posts: 31
Joined: 24 Dec 2015, 22:36

Re: flickering playback of live tv

Post by spmcewen » 04 Feb 2018, 19:14

Certainly. Here is a clip I captured with my phone showing the problem: https://www.youtube.com/watch?v=CFBLNmM4ReQ

Notice the flickering, especially in the black jacket, when the interview starts 3 seconds in. Near the end the flickering stops. This happens in MrMC on my Apple TV 4k, Apple TV 4th gen, as well as my iPad. When I play the same clip as above in Kodi on my iMac there is no flickering. So I don't think this is a problem with my tuners or MythTV itself. The problem seems to only happen when playing back in MrMC on any device. The flickering typically occurs only in commercials which makes me wonder if it's frame rate related. This started happening at some point in the past couple of months, sorry I can't be more descriptive other than that but I'm certain it hasn't always done this.

And the debug log is here: https://pastebin.com/bBdRR11G

Thanks for your help!

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davilla
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Joined: 26 Oct 2015, 17:01

Re: flickering playback of live tv

Post by davilla » 04 Feb 2018, 19:18

interlace settings ?

spmcewen
Posts: 31
Joined: 24 Dec 2015, 22:36

Re: flickering playback of live tv

Post by spmcewen » 04 Feb 2018, 19:23

Deinterlace video and deinterlace method are both set to auto on all devices.

spmcewen
Posts: 31
Joined: 24 Dec 2015, 22:36

Re: flickering playback of live tv

Post by spmcewen » 04 Feb 2018, 20:15

Ah ha! If I set deinterlace video to on instead of auto, and leave the method to auto the flickering issue goes away.

cosmoxl
Posts: 1407
Joined: 12 Dec 2015, 14:16

Re: flickering playback of live tv

Post by cosmoxl » 04 Feb 2018, 21:00

spmcewen wrote:
04 Feb 2018, 20:15
Ah ha! If I set deinterlace video to on instead of auto, and leave the method to auto the flickering issue goes away.
Interesting. so a case of ffmpeg not detecting interlaced. I bet Davilla will want a sample.

spmcewen
Posts: 31
Joined: 24 Dec 2015, 22:36

Re: flickering playback of live tv

Post by spmcewen » 04 Feb 2018, 21:23

cosmoxl wrote:
04 Feb 2018, 21:00
I bet Davilla will want a sample.
I uploaded the clip I was testing with here: https://www.dropbox.com/s/3hlqdnlqqh2be ... 51.ts?dl=0

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davilla
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Joined: 26 Oct 2015, 17:01

Re: flickering playback of live tv

Post by davilla » 04 Feb 2018, 21:37

Seems fine now under version in testflight, no flicking on appletv4k

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