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Optical Flow Analysis
I’ve been playing with optical flow for time remapping and I’ve noticed something disconcerting. First, the results are rather horrible. Second, the analysis seems to happen almost automatically. I just can’t believe that something as complicated as analyzing motion and interpolating pixels can happen that fast. At one point, I actually got a “Optical Flow Analysis” background task happening and it took quite a while to finish. I fear that the analysis is not actually occurring and all I’m seeing when I play the clip in the timeline is some sort of quick draft preview. Any ideas?
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5 Replies
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It’s definitely doing Optical Flow IF you set it to that. It doesn’t default to that when you do a time remap. When you pull down the Retime tool on the right, select Video Quality and then select Optical Flow. Depending on the shot I get the same Optical Flow artifacts I’d get if I were using Twixtor for example.
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Nice demo:
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I understand that you need to select it. What I was saying is that it appeared as if FCPX wasn’t doing a full analysis on this particular clip. However, I now realize I was just confused as to how FCPX works. It must have done the analysis in background when I wasn’t looking and then it caches the results in the event data, so even if you delete the clip and re-add it to your project, it doesn’t need to re-analyze. Adding the entire uncropped clip to my project forced it to do a new analysis.
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But under what circumstances?
It’s working for me in FCPX.Apple will want to know how to reproduce.
Could it be codec or source related or are you seeing this on a variety of codecs? -
Sorry. False alarm. It works.
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