Export frame from Source Monitor via Timeline

Question

I need to export a frame from Source monitor, since I don't have a direct Source Monitor API for doing so, I use the Sequence API this way:

I select a frame in the Souce Monitor using the time indicator.
I add the media to a new sequence
I set the sequence time indicator like this:

seq.setPlayerPosition(app.sourceMonitor.getPosition().ticks)

I export the frame in Timeline:

  activeSequence.exportFrameJPEG(timecode, outPath)

My issue is that I get one frame back relative to my selection in Source Monitor.

Any suggestions how can I get through it?

Bruce Bullis · Accepted Answer

I understand. In my case the user should not be aware of all this. The user selects a frame on the Source Monitor and should be able to see it in the extension.

Is there a way to do it without opening AME? I can theoretically set one frame back in the timecode I pass to exportFrameJPEG, but it seems to me a like a bad approach.

> Is there a way to do it without opening AME?

Not using the supported API; you could continue to use activeSequence.exportFrameJPEG(), from QE DOM.

> I can theoretically set one frame back in the timecode I pass to exportFrameJPEG, but it seems to me a like a bad approach.

For a complete solution, you'd need to get the sequence frame rate, factor in non-zero start times (if you're not sure the sequence starts at 00;00;00;00), and move to the next frame boundary before attempting to export.

Bruce Bullis · Answer

Ticks are more accurate than timecode; I think you may be running into rounding error.

If the clip in the Source Monitor is also in the project, it has a projectItem, which you could then use encodeProjectItem() to transcode (rather than relying on the QE DOM).

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