On 17/04/18 22:27, Nick Payne wrote:
I just ran another test on some 1280x720 50fps and 1280x720 25fps
downloads from the last UK snooker championship. As before, the 25fps
downloads were reduced to about 1/3 previous size by Handbrake (eg a
4h58m match that was 5.03Gb came down to 1.55Gb). However, the 50fps
downloads were reduced by far more with exactly the same settings in
Handbrake - for example, a 4h44m match that was a 10.2Gb download from
GiP came down to 1.48Gb, and a 4h14m 8.93Gb file came down to 1.30Gb.
This leads me to wonder if the 50fps downloads are from a 25fps original
and just have each frame duplicated, as after running through Handbrake,
the file sizes just seem proportional to the length of the program, and
whether 50fps or 25fps has no effect on the file size.
That's interesting. I did wonder how the BBC was generating its 50fps
material. It seemed surprising that it would shoot all its material at
a higher frame rate than broadcast just for the benefit of the iPlayer.
If I want to achieve a 50fps frame rate by duplicating frames I can do
that myself. For the BBC to duplicate frames is a waste of everyone's
time and bandwidth.
Best wishes
Richard
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