Quote from: smcbuki on February 04, 2018, 06:31

Hi all!
[This is similar topic to KB's recent topic, but this one is only about optical flow and it's impact on video quality.]
I'd like to make a slow motion clip, but my camera does only 1080 60p. I import my footage into FCPX and conform clip to 24p. I get 2.5x slow motion. Let's say I want 3x or 4x slow motion. Should I use optical flow? How is it going to impact video quality? Will it be good enough for stock? What's your experience?


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There is no one answer to this. Except "it depends".

You need to try it on a clip to clip basis.

Generally, if there isn't a lot of movement between frames, and not too many details (like leaves), it will work well. If there is a lot of movement or small details, you will get artefacts.

To answer your question "should I use optical flow": yes. Or a third party alternative like Twixtor, which is essentially optical flow with more options, like masking.

Frame blending usually looks pretty ugly, but can work sometimes.

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You can only ever fake something convincingly to a certain extent.

To sum up: it will only look nice if the motion is already slow and even, and you want to make it super slow.

Thank you for your answer. Yes, I guess it depends from the actual footage. From what I saw on YT, people use it for "near freeze" effect.