60FPS interpreted to 48FPS

Question

My original batch of slo-mo footage was shot at 48FPS (47.952 to be exact) and then 'rendered' at 23.976 even before I received the footage, so I wasn't left with having to deal with interpreting the footage myself and then having to deal with frame blending issue (I'm guessing) when playing back the footage on a 23.976 timeline. Whatever the reason, it was very convenient to get footage this way.

The new batch of footage was shot at 60FPS, so at 23.976 it plays back a little slower than the orginal 48FPS footage. The director doesn't care for this and would like the new slo-mo footage play back the same as the orignal slo-mo footage.

In Media Encoder, I've interpreted the footage at 47.952 but what actually gets spat out is a clip at 50FPS. Is there a way to interpret the footage at 48FPS? (In the frame rate dropdown, it goes from 50 to 30 with no 48 selection. The deliniation between frame rate and interpret footage is not clear to me. What I know is that it's the 'interpret footage' function I need to use when changing the speed of a clip.)

And, should I switch the Time Interpolation from the default Frame Sampling to Frame Blending? Will this give me a smoother pix?

Mike Dziennik · Answer

'Interpret footage' will always play all frames in the clip without any blending/interpolation or anything which affects the quality of the image. The frames that are present in the clip will be played back at the rate you interpret the clip at:

If clip is 60fps and you interpret at 60fps then the clip will appear 'normal/realtime'.

Interpret the same clip at 30fps - the clip will be played back at 30 "frames per second"! So the same frames will be played but only 30 every second so the clip will be twice as long and will appear 'slowmo'.

Your initial clips are 48fps and your new ones are 60fps:

Divide 60/48 gives you 1.25 - which means you need to play your 60fps clips at 125% in order to 'appear' the same speed as your 48fps ones.

I'd interpret your new clips as 23.976 and then apply a timeline speed effect of 125%.

The best interpolation method depends on your content. Try them and see; if one was always better than the others...it would be the default and you wouldnt have a choice!

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