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Isaac Connor 2b14e9044e fix: improve montage review playback smoothness and fix video seek overshoot

Fix FFmpeg initial seek overshooting to a future keyframe when the
requested timestamp falls between keyframes. After the initial
AVSEEK_FLAG_FRAME seek, detect if the returned frame is past the
target and re-seek backward to get the correct keyframe before it.

On the JS side, preserve fractional seconds throughout the playback
pipeline: remove Math.floor() truncation in mmove() and setSpeed(),
and use parseFloat instead of parseInt for currentTimeSecs
initialization. Reduce initial display interval from 1000ms to 100ms
for ~10fps refresh rate during review playback.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-02-26 13:16:07 -05:00