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I've recently started making scripts to assist in my video editing, and it's already helped me out tremendously! Now I want to make a script that automatically changes the video offset of all the selected strips by a set amount.

In doing this, I noticed a very confusing property about trimmed video clips. For the Trim Duration (soft), the frame_offset_start of clips makes sense because it's the frame of the original clip where this cut begins. However, the frame_offset_end seems to make absolutely no sense. Its value is lower than the start value, but it's not the length of the clip and it's not the end frame. When I increase the value, the clip gets shorter! What is going on?

Trim Duration(soft):81097-18536

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As you noted, frame_offset_start it is how many frames are cropped from start.

And same logic for frame_offset_end, but not from the start, from the end of strip!

So, If you increase that value, it will be crop more from end of the strip, and it will be shorter

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Hard and soft cut, and the differences between them, explained here: Video sequence editing, cutting strips

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