Detecting a seek operation in Render

Hello
I am writing a plug-in where the rendering of a given frame depends upon several previous frames.
Thus, in order to correctly render, I need my filter to be applied to a consecutive series of frame.
If the user seeks through the clip, in order to perform a correct rendering operation, I'll need to perform a "look behind" operation.
Thus, my question is : is there an easy way to detect whether a seek operation just took place ? Do I need to perform my own caching of the time info in the PF_InData structure ?
Thanks for your help !

Hi Benjamin,
The flag described at that post is for a different problem. If you need to make a calculation that starts from the first frame and accumulates over the duration of the frames, you should be prepared to handle a request for anytime, and not necessarily the next frame in sequence from the beginning. What happens when the user moves the time needle to the middle of the footage? An effect should be prepared to handle normal use cases like that.
One approach is to go back and calculate all the necessary frames between the current frame and the last frame that has been calculated. You can use PF_CHECKOUT_PARAM() to get input frames for any previous frame that you need to make the calculation. And then cache the results of your calculations in sequence data.
Regards,
Zac

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