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.

SHA-2564a0db02a66955d556c366021cfbcc14c87cff1d1c2e5c842c545aba4e6a595e9

VerificationFixture characteristics cross-checked with FFprobe 7.1.5 on September 30, 2026.

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.

Fixture context

What the fixture confirms

FFprobe 7.1.5 confirms H.264 High profile video at 320×180 with 30/1 average and nominal frame rates, yuv420p video, AAC audio and an MP4-family container. The ClipCompat rule expectation is a supported baseline unless a target-specific condition adds a more cautious finding.

Safe handling

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

Observed analyzer evidence

From sample facts to a practical verdict

These synthetic files were analyzed on 2026-10-11 using MediaInfo WASM and the same normalization and compatibility rules used by the checker. This run used Node.js; it was not an import or playback test in Premiere or Resolve.

H.264 CFR MP4 Baseline

Detected media: MPEG-4 · AVC · High
Image and timing: 8-bit · 4:2:0 · CFR
Premiere / Windows: Supported
Resolve Free / Windows: Supported

Why Premiere / Windows received this result

Common Premiere editing baseline
H.264/AVC in an MP4 or MOV-style container with conventional 8-bit 4:2:0 characteristics is a common Premiere source combination.
Evidence: heuristic
Premiere documents H.264/AVC hardware decoding for MP4 media
Adobe documents hardware-accelerated decoding for MP4 media using H.264/AVC. Actual acceleration still depends on supported hardware and drivers.
Evidence: official support

Next action: Try the original in your installed editor. If import fails, investigate the app version and source integrity before converting.

Download the same sample

A readable codec is not a guarantee of editor support. Test Required records a limit of the current rules; Supported is not an editor benchmark. Download raw MediaInfo output, normalized facts, checksums and full findings (JSON). Read the methodology.

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