CemAygun
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Turkey
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MKosmo Posted at 7-27 09:42
Would you expect the image to be better on 24/30 FPS if it’s the same bit rate as 60fps ?
I must admit I don’t see one but then maybe it depends on the type of scene and movement etc .... ?
Well, yes and no Bitrate vs quality works on one principle: "More" does not make any noticeable difference as long as you have "enough". It is the times that you don't have enough, every single extra bit counts. So yes, having a much higher storage allowance per frame (by having less frames to store in the same amount of data) makes a difference, but no, not always...
Modern codecs perform both a spatial and a temporal compression. Which means they compress every frame within itself like a jpeg picture and compress multiple consequent frames together (oversimplified, but that is the gist of it). So when it comes to bitrate needs, every detail in the composition, and every big movement between the frames is our enemy.
This need increases considerably when you have a narrow aperture, wide angle lens camera with a fixed focus at infinity (a lot of things in composition, and in focus = a lot of detail) which is used for "Action" ( = a lot of movement)
This is why I think it is good to have high bitrates for OA, it is a blessing for it's intended use. And of course it would not be possible to see an apparent difference in every scenario, even with OA.
Sorry for the long explanation & cheers
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