Problem
Exported video has a different frame cadence because a 23.976 timeline was rendered as exact 24 fps.
Solution
Root Cause / Diagnostic:
Broadcast standard 23.976 fps (24000/1001) differs from true cinema 24.000 fps by a factor of 1.001 (a 0.1% speed delta). When a 23.976 timeline is exported to an exact 24.000 fps delivery preset without explicit time-stretching, the NLE either duplicates one frame every 41.7 seconds to maintain duration or drops audio sync over time. This frame duplication creates periodic motion stutter (judder) and introduces fractional second timing discrepancies that fail strict broadcast ingest QC checks.
Actionable Fix:
1. Verify the exact timeline frame rate in Sequence / Timeline Settings and match the export preset frame rate precisely to 23.976 fps.
2. If true 24.000 fps delivery is mandated by a cinema distributor, conform audio tracks with a 0.1% speed pull-up (speed multiplier: 1.001) to prevent drift.
3. Review long camera pans across the exported master file to verify that frame pacing is uniform without periodic frame repeats.
Pro Tip:
Never interchange 23.976 fps and 24.000 fps within the same project without strict conform rules; tag all raw project media bins with exact decimal frame rates during initial project setup.
Broadcast standard 23.976 fps (24000/1001) differs from true cinema 24.000 fps by a factor of 1.001 (a 0.1% speed delta). When a 23.976 timeline is exported to an exact 24.000 fps delivery preset without explicit time-stretching, the NLE either duplicates one frame every 41.7 seconds to maintain duration or drops audio sync over time. This frame duplication creates periodic motion stutter (judder) and introduces fractional second timing discrepancies that fail strict broadcast ingest QC checks.
Actionable Fix:
1. Verify the exact timeline frame rate in Sequence / Timeline Settings and match the export preset frame rate precisely to 23.976 fps.
2. If true 24.000 fps delivery is mandated by a cinema distributor, conform audio tracks with a 0.1% speed pull-up (speed multiplier: 1.001) to prevent drift.
3. Review long camera pans across the exported master file to verify that frame pacing is uniform without periodic frame repeats.
Pro Tip:
Never interchange 23.976 fps and 24.000 fps within the same project without strict conform rules; tag all raw project media bins with exact decimal frame rates during initial project setup.