UK: Judder on Channels on Apple TV


#1

I've noticed I have judder (especially on the HD channels) when using the channels app on Apple TV. I have a feeling it is due to PAL being 50hz. If I set my Apple TV to 50hz it is much better but everything else on Apple TV is awful.

Is there anyway around this for us UK folk?


#2

You can set it to 50hz and then enable frame rate matching so other apps switch to 60hz


#3

Been a while since I've used Channels on ATV but has the option to auto switch frame rate within the app been removed then?


#4

Thanks, I've done that :smile:

I've been playing with the settings for an hour or so but now I seem to have a stutter that occurs every 10 seconds or so.

Any chance this could be a HDMI issue?


#5

I believe so. I only see an option for SDR switching.


#6

Just to update on this. I believe I've solved it. I swapped my HDMI cable to a new high speed one (which seemed to have fixed vertical tearing I was experiencing on everything) and also tinkered with my TV's settings (Sony's film mode and motion settings - medium and standard) and it seems spot on now after letting a channel settle for a minute or two.


#8

This is happening again. I believe it's linked to the deinterlacer on ATV as my Android phone is perfect.


#9

I get this when 1st opening app after ATV is woken from sleep. If I back out to home page & reopen, it's then ok after seeing screen go black as it sets correct frame rate, which it doesn't on 1st go.


#10

I think it's how Channels handles UK/50Hz TV in general. I see the same behaviour on my Nvidia Shield if I use software decoding. Hardware decoding works fine. The trouble with hardware decoding is that it doesn't understand aspect ratio changes, so 4:3 programmes end up getting stretched. Not sure if the Apple TV supports hardware decoding of interlaced content; I vaguely remember that being called out as a limitation?


#11

I know there's an option to stretch 4:3. With me Quest HD and Channel 4 HD (+1 HD included) are the worst.

I noticed the black screen you mentioned @Stuart_Fagg but it doesn't seem to fix anything on these channels. I've tried both interlacing options.

A good programme to test is A Place In The Sun.


#12

I've suffered with the same sort of problem on and off over the last year. I suspect it could be the deinterlacing as I seem to always notice it on 1080i channels. Weirdly it doesn't happen all the time but when it does a skip back usually solves it, annoying as it's about the only problem I ever had with Channels.


#13

Channels : is there anything we can do to help debug this?