Popcorn Hour A-210 (a hardware player connected to a TV) can play H.264 videos only up to Level 4.1.
So it can play 1920x1080 60p video if I force ffmpeg to set Level 4.1 for encoded video. And if I leave it by default, ffmpeg correctly sets Level 4.2 and this video can NOT be played on Popcorn Hour A-210.
I received complaints from an user of Popcorn Hour A-210 and he suggests me set wrong Level 4.1 for 1080 60p videos.
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