So you want to make thumbnails from your clips, but you don't know the length, use the following:
Instead of <time>20</time> –> use a percentage-based value: <time>20%</time>.
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So you want to make thumbnails from your clips, but you don't know the length, use the following:
Instead of <time>20</time> –> use a percentage-based value: <time>20%</time>.