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23.98 to 25 fps
Working on a 30 second video that has been shot in 60fps, with a timebase of 23.98. Project was set up in 23.98, and all footage sped up 250%. The video consists of long, smooth camera moves, many fine details in the frame, with very few cuts. Everything looks good, runs smoothly.
Now getting the request to export in 25 fps to broadcast in Europe. Running tests, so far I’m getting only unsatisfactory results:
– Just placing the video into a 25fps sequence shortens the video by more than a second.
– Placing the video into a 25 fps sequence and speeding it up by 4% creates an extra frame every second, which is very apparent a 1 frame jitter/blip in the smooth camera moves.
– Processing the increase in speed with Optical Flow creates artifacts on the details.
– Exporting the 23.98 sequence as 25 fps creates the same result, either an intermittend “skip”, or artifacts.
Any ideas or experience?
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2 Replies
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Hey Eric,
Sorry, it sounds like a real big mess.
Why, or more, how did your Sequence end up as 23.98 fps?
Is that the intended master-format?
Hopefully, it is 23.97 fps?What is the frame-size of your rushes (6K, 4K, 2K?), and the exported master?
Was it shot in Progressive, or have you set the sequence up to be progressive?Two suggestions to try:
Export clean master High Quality of the 23.98 fps sequence – no graphics and no animations on it.
Put through Media Encoder, and export to 25fps High Quality file, and see what happens?The other is to copy your edits in to a 25 fps interlaced Sequence, and see how that reacts?
As you suggest, the most important part is to keep the smoothness of the camera movement.
And, then there is the potential of audio that needs to match?
Good news is that since PAL v NTSC, a lot of science has gone into making the perfect frame-rate conversions between the two. So this can be fixed.
Hope that this helps?
Atb
Mads -
Funny same experience here.
Client needs 26 episodes converted to 25i from 24p.
Shot on RED at 23.976 of course.
They need an MXF XDCAM 25i for another country.
Easy peasy with AME.
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