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fix: Account for drop-frame LTC in time calculation

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Co-authored-by: aider (gemini/gemini-2.5-pro) <aider@aider.chat>
This commit is contained in:
Chris Frankland-Wright 2025-08-03 15:37:25 +01:00
parent d13ffdc057
commit 22dc01e80f
4 changed files with 14 additions and 8 deletions
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7
src/system.rs
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@ -49,10 +49,10 @@ pub fn calculate_target_time(frame: &LtcFrame, config: &Config) -> DateTime<Loca
let total_duration_secs =
Ratio::new(timecode_secs, 1) + Ratio::new(frame.frames as i64, 1) / frame.frame_rate;
// For fractional frame rates (23.98, 29.97), timecode runs slower than wall clock.
// For non-drop-frame fractional rates (23.98, 29.97), timecode runs slower than wall clock.
// We need to scale the timecode duration up to get wall clock time.
// The scaling factor is 1001/1000.
let scaled_duration_secs = if *frame.frame_rate.denom() == 1001 {
// The scaling factor is 1001/1000. For drop-frame, this isn't necessary.
let scaled_duration_secs = if *frame.frame_rate.denom() == 1001 && !frame.is_drop_frame {
total_duration_secs * Ratio::new(1001, 1000)
} else {
total_duration_secs
@ -196,6 +196,7 @@ mod tests {
minutes: m,
seconds: s,
frames: f,
is_drop_frame: false,
frame_rate: Ratio::new(25, 1),
timestamp: Utc::now(),
}