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Red 4k playsback smooth while 3k stutters until go down to 1/2 debayer?????
I work in the red 1080p 25 preset with fulldebayer (scale to fit). This works good with the 4k files. But once I import slowmo shot at 48fps in 3k in (still 25fps timebase) premiere starts to stutter on playback. If I go down to 1/2 debayer it playsback fine but looks nasty of course on the ref monitor.
It is easier to play back 25fps 3k than 4k, why does not premiere get this?? I looked and premiere does think the 3k should play back at 25fps so far so good.
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4 Replies
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Even if it is 3K it has double the frames and probably a higher bitrate than the straight up 4K.
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Does not matter if its 300fps when I record. Its only tagged to playback 25fps. For example you can record 120fps 4k with an Epic and take that ssd disk to a Scarlet and play it back with no problem. The camera only needs to playback 25fps so thats why its works.
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I think I might know why. Redraw is a wavelet codec, which means it can build up the file to various smaller resolutions rather then doing the full res.
My guess is that since you’re editing in a 1080p timeline, the 4k is only being decoded to 2k and then scaled down to 1080p
The 3K however, can’t be decoded to 1.5k since thats less then 1920×1080 so it has to be decoded to full 3K and then scaled down to 1080p
So Premiere has to do more work with the 3K then the 4K
Thats my guess.
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Hi John-Michael, this could be the case. Good theory. I will investigate this further.
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