RESEARCH / PRACTICAL UTILITIES

Frames meet time.

Convert a batch of frame indices or elapsed seconds. Make the indexing convention explicit before matching video to observations.

Constant-frame-rate footage only. Not SMPTE/drop-frame timecode and not variable-frame-rate correction. Time is measured from the start of the first frame. Seconds-to-frame conversion rounds to the nearest frame; exact halves round upward. Use the actual source frame rate. Up to 10,000 values.

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