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Lab Case 01

H.264 CFR MP4 Baseline

A small synthetic MP4 that represents a conventional H.264 editing baseline.

✓ Synthetic fixture✓ Browser-local test✓ Reproducible
Expected top-level behaviorSupported

What this case is designed to prove

Verify that ClipCompat can distinguish a common H.264/AVC, 8-bit, 4:2:0 constant-frame-rate source from files that need extra caution.

Sample fileh264-cfr.mp4about 56 KB · synthetic test media
Download sample

Generated from FFmpeg test patterns and a synthetic sine-wave audio track. It contains no user footage.

Sample input

Known media facts

These are the characteristics the fixture was generated to expose. MediaInfo may format some labels slightly differently across versions.

ContainerMPEG-4 / MP4
Video codecAVC / H.264
ProfileHigh
Resolution320 × 180
Frame rate30 fps
Frame-rate modeCFR
Bit depth8-bit
Chroma4:2:0
AudioAAC / 48 kHz

Expected behavior

What ClipCompat should report

  • The VFR Checker should identify constant frame timing when the file exposes a clear CFR label.
  • Premiere Pro should receive a supported/common baseline finding for H.264 in MP4 with 8-bit 4:2:0 characteristics.
  • DaVinci Resolve should receive a documented H.264 container/codec support finding for common MP4 workflows.

Development result

What we verified

The fixture was generated and inspected locally during development. The expected ClipCompat result is a supported baseline unless an editor-specific rule or environment adds a more cautious condition.

Safe handling

No conversion is recommended merely because the file is H.264. Keep the original and test it in the intended editor first.

Run the test

Open a related checker.

The same sample can intentionally produce different guidance depending on the selected editor target.

ToolVideo Compatibility CheckerOpen checker →ToolPremiere Pro CheckerOpen checker →ToolDaVinci Resolve CheckerOpen checker →ToolVFR CheckerOpen checker →
Related troubleshooting guides
Variable frame rate guide →

More evidence

Compare all five Lab Cases.

Use the case index to move from a common H.264 baseline to VFR, HEVC 10-bit 4:2:2, VP9 and AV1 test media.

View all Lab Cases