How to get imGetSourceVideo called when I want to?

Question

Hi all, I am a Premiere Pro plugin developer and I know that imGetSourceVideo is called for every frame when we playback the clip on the timeline. However, I am wondering if I can trigger this selector manually even when the playback is stopped.
 
Here is the situation: I have created an HTTP server in my importer plugin and it continuously listens to requests from other applications. When the plugin receives a request (e.g., render settings changed), I need to render the current frame again using the latest settings. The question is, how can I achieve this?
Thank you.

Bruce Bullis · Accepted Answer

in what sense is "verifying that the current settings are as desired" even possible?

Let's consider a scenario where I have a set of stitching algorithms and I want to evaluate the differences under specific circumstances. In this case, it would be preferable to compare the results on the same frame for a more accurate assessment.

Right, but if PPro doesn't want (request) those frames, what use is that evaluation?

Broadly speaking, PPro requests media from Importers, when it wants to; not when the Importer feels like providing media.

Bruce Bullis · Answer

Why would you want to re-render frames every time something remote changes, rather than waiting until the frame was requested and re-rendering it then? What do you gain out of your pro-active caching?

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