50fps is broadcast live and on some iPlayer programmes. Sometimes it's true 50fps (live) and iPlayer is often doubled up 25fps.
This is what youtube-dl reports from a recent NFL programme:
Code:
stream-uk-iptv_streaming_concrete_combined_hd_mf_akamai_uk_dash-video=827000 mp4 704x396 DASH video 827k , avc3.4D401E, 25fps, video only
stream-uk-iptv_streaming_concrete_combined_hd_mf_limelight_uk_dash-video=827000 mp4 704x396 DASH video 827k , avc3.4D401E, 25fps, video only
stream-uk-iptv_streaming_concrete_combined_hd_mf_akamai_uk_dash-video=1570000 mp4 704x396 DASH video 1570k , avc3.64001F, 50fps, video only
stream-uk-iptv_streaming_concrete_combined_hd_mf_limelight_uk_dash-video=1570000 mp4 704x396 DASH video 1570k , avc3.64001F, 50fps, video only
stream-uk-iptv_streaming_concrete_combined_hd_mf_akamai_uk_dash-video=2812000 mp4 960x540 DASH video 2812k , avc3.64001F, 50fps, video only
stream-uk-iptv_streaming_concrete_combined_hd_mf_limelight_uk_dash-video=2812000 mp4 960x540 DASH video 2812k , avc3.64001F, 50fps, video only
stream-uk-iptv_streaming_concrete_combined_hd_mf_akamai_uk_dash-video=5070000 mp4 1280x720 DASH video 5070k , avc3.640020, 50fps, video only
stream-uk-iptv_streaming_concrete_combined_hd_mf_limelight_uk_dash-video=5070000 mp4 1280x720 DASH video 5070k , avc3.640020, 50fps, video only
iptv_streaming_1500_akamai_hls_open-797 mp4 640x360 797k , avc1.77.30, mp4a.40.2
stream-uk-iptv_streaming_concrete_combined_hd_mf_akamai_uk_hls-1013 mp4 704x396 1013k , avc1.4D401E@ 827k, 25.0fps, mp4a.40.2@128k
stream-uk-iptv_streaming_concrete_combined_hd_mf_limelight_uk_hls-1013 mp4 704x396 1013k , avc1.4D401E@ 827k, 25.0fps, mp4a.40.2@128k
iptv_streaming_1500_akamai_hls_open-1496 mp4 832x468 1496k , avc1.77.30, mp4a.40.2
stream-uk-iptv_streaming_concrete_combined_hd_mf_akamai_uk_hls-1800 mp4 704x396 1800k , avc1.64001F@1570k, 50.0fps, mp4a.40.2@128k
stream-uk-iptv_streaming_concrete_combined_hd_mf_limelight_uk_hls-1800 mp4 704x396 1800k , avc1.64001F@1570k, 50.0fps, mp4a.40.2@128k
iptv_streaming_1500_akamai_hls_open-2383 mp4 1280x720 2383k , avc1.640029, mp4a.40.2
stream-uk-iptv_streaming_concrete_combined_hd_mf_akamai_uk_hls-3117 mp4 960x540 3117k , avc1.64001F@2812k, 50.0fps, mp4a.40.2@128k
stream-uk-iptv_streaming_concrete_combined_hd_mf_limelight_uk_hls-3117 mp4 960x540 3117k , avc1.64001F@2812k, 50.0fps, mp4a.40.2@128k
stream-uk-iptv_streaming_concrete_combined_hd_mf_akamai_uk_hls-5510 mp4 1280x720 5510k , avc1.640020@5070k, 50.0fps, mp4a.40.2@128k
stream-uk-iptv_streaming_concrete_combined_hd_mf_limelight_uk_hls-5510 mp4 1280x720 5510k , avc1.640020@5070k, 50.0fps, mp4a.40.2@128k (best)
Having thought about it some more, I think the BBC will need to create a new station to broadcast this new UHD. They have the standard and HD, but I think a new UHD will be required.
They'll probably only make the UHD available on the blu-ray discs, since it was filmed in UHD.