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    4K 1st Gen Apple TV Crash

    guys I think so I figured out why - just why we have 4K playback issues with 1st gen apple 4K tv.
    A1842 - AppleTV6,2I went into some archives of apple newsroom and found this article where it clearly mentions that this newer gen 2nd apple tv 4K has A12 Bionic chip and it supports 4K HDR with High frame rateSo I opened up the Olympics 4K stream HLS file. Usually on traditional movies we have 23.7fps or 24fps. Only hobbit or handful of actual movies are shot at 60fps.
    But not being prevalent to Live TV | sports streaming culture in USA, I came to know that you guys have 60hz tv vs Europe having 50hz PAL vs NTSC or something (old stuff)
    & I predicted maybe Olympics 4K "Sports TV" content could be 60fps | hz as well. Voila! it was according to my novice understanding of HLS manifest formatting.

    #EXT-X-STREAM-INF:BANDWIDTH=18104192,AUDIO="104192-mp4a.40.5",CLOSED-CAPTIONS="cc",FRAME-RATE=59.940,PROGRAM-ID=1,CODECS="hvc1.2.4.L153.90,mp4a.40.5",SUPPLEMENTAL-CODECS="dvh1.08.09/db1p",RESOLUTION=3840x2160,VIDEO-RANGE=PQ
OLYM4K_UD_02163/track-video-repid-trackId-101-tc-.m3u8

    including the old HLS Olympics 4K stream for reference.So once in a blue moon - the error AVFoundation | AVKit gave us back is kinda true "false positive"
    It said incompatibleDisplay but it should have been incompatibleSourceFrameRateFor4KTl;Dr: Apple 4KTV 1st gen old hardware 2017 - mo' bit rate | frames mo' heat ==> bad bad (CPU throttling)so apple never supported it and other 4K content usually is less than 30fps.
    Now I can enjoy my 4th of July ! @principal_engg @director2 

    Apple unveils the next generation of Apple TV 4K

    With A12 Bionic and the all-new Siri Remote, the best living room device gets even better. (37 kB)

    P.S : sorry for late ping in the evening - just couldn't share this and close off. It all ties together why youtube was crashing on 4K videos. Because youtube videos have option for 4K at 30fps & 60fps. So my understanding is it was trying to play at higher frame rate + bitrate when network conditions are perfect -> but they had this error which was not handled by them just like PlayerPlatform had to do. Its just we were 2 - 3 years late because we never had this scenario as our content was never 4K @60fps.

    References:

    apple newsroom 1st gen apple tv 4K
    no mention of high frame rate HDR or anything.

    apple HLS documentation supplemental codecs | Dolby Vision | HDR
    we were using VIDEO-RANGE=PQ which is Dolby Vision

    CODECS="hvc1.2.4.L153.90,mp4a.40.5",
SUPPLEMENTAL-CODECS="dvh1.08.09/db1p",
RESOLUTION=3840x2160,
VIDEO-RANGE=PQ

    apple technical document for the device also mentions so no HDR at 60fps support & we use Dolby Vision (HDR) protocol.

    ### Video Formats

- H.264/HEVC SDR video up to 2160p, 60 fps, Main/Main 10 profile
    
- HEVC Dolby Vision (Profile 5)/HDR10 (Main 10 profile) up to 2160p