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I have some HEVC video files which play fine in QuickTime and VLC, but show only a black screen when playing in TV.app (audio works fine).

This is the relevant output from ffmpeg's ffprobe of one of these files, the others I tested were encoded with the same settings:

Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2mp41
    date            : 2016-05-08T22:00:00
    encoder         : Lavf58.20.100
    media_type      : 10
Duration: 01:28:43.03, start: 0.000000, bitrate: 279 kb/s
    Stream #0:0(und): Video: hevc (Main) (hvc1 / 0x31637668), yuv420p(tv, progressive), 640x360 [SAR 1:1 DAR 16:9], 176 kb/s, 25 fps, 25 tbr, 12800 tbn, 25 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 96 kb/s (default)
    Metadata:
      handler_name    : SoundHandler

I also have one with the fourCC set to hev1, which definitely worked in iTunes on Mojave. The video stream information on that is

Stream #0:0(und): Video: hevc (Main) (hev1 / 0x31766568), yuv420p(tv), 1920x1080 [SAR 1:1 DAR 16:9], 1953 kb/s, 23.98 fps, 23.98 tbr, 16k tbn, 23.98 tbc (default)

I assume the subsampling is correct, because I used the settings recommended by the ffmpeg wiki and because they worked before.

In older macOS versions, this problem was caused by having the wrong four CC, but I've used both of them and neither work. What have I done wrong? I assume the problem isn't the encoding, since it worked on Mojave and in QuickTime (actually, I'm surprised that the playback code is different).

(Originally asked on Apple Support Communities, but I got no answer there.)

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