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Find files, editable templates and browser test targets by what you need to make or test. The directory below is cut by format; the two collections under it cut the same library by subject and by workflow.

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MP4 Layout: moov Atom at End

The default MP4 layout, with the index written last. A progressive-download player must fetch the entire file before it can start: the classic 'video buffers forever' bug, and invisible unless you look at the atom order. Byte-for-byte the same encode as its twin in this group; only the atom order differs, which is why comparing the two is the clean way to demonstrate the effect.

File: MP4 · Structure · 480x270
Use case: Video codecsConversion testing+1· Conversion set

MP4: A/V Mux with 440 Hz Tone

Video muxed with a 440 Hz sine tone, for A/V container and audio-track tests.

File: MP4 · Av · 480x270
Use case: Conversion testingAudio analysis· Conversion set

MP4: A/V Mux with 880 Hz Tone

Video muxed with an 880 Hz tone: frequency twin for audio pipeline tests.

File: MP4 · Av · 480x270
Use case: Conversion testingAudio analysis· Conversion set

MP4: Audio Desync 100ms

SAMPLE clip with audio delayed ~100 ms, for A/V sync detection tools.

File: MP4 · Av · 480x270
Use case: Conversion testingAudio analysis· Conversion set

MP4: Audio Desync 250ms

SAMPLE clip with audio delayed ~250 ms, for A/V sync detection tools.

File: MP4 · Av · 480x270
Use case: Conversion testingAudio analysis· Conversion set

MP4: Audio Desync 500ms

SAMPLE clip with audio delayed ~500 ms, for A/V sync detection tools.

File: MP4 · Av · 480x270
Use case: Conversion testingAudio analysis· Conversion set

MP4: Black Flash Frames

Short black flash frames SAMPLE for colour and flash QC detectors.

File: MP4 · Edges · 480x270
Use case: Conversion testing

MP4: Black-Frame Insert

A clip with a short pure-black insert, for black-frame detectors and QC tools.

File: MP4 · Edges · 480x270
Use case: Conversion testing

MP4: Burned-In Timecode

On-screen running timecode burned into frames, for OCR and slate tools.

File: MP4 · Edges · 480x270
Use case: Conversion testingOCR testing

MP4: Colour Bars

A short colour-bar test pattern clip, for colour pipeline and player QC.

File: MP4 · Edges · 480x270
Use case: Conversion testing

MP4: Colour Bars (Silent)

Silent colour-bar twin of the bars+tone clip, for audio-presence detectors.

File: MP4 · Bars · 480x270
Use case: Conversion testing· Paired fixture

MP4: Colour Bars + 1 kHz Tone

SMPTE-ish colour bars with a 1 kHz reference tone: classic QC fixture.

File: MP4 · Bars · 480x270
Use case: Conversion testingAudio analysis· Paired fixture

MP4: Countdown Digits

On-screen countdown digits burned into frames, for OCR and slate detection.

File: MP4 · Edges · 480x270
Use case: Conversion testingOCR testing

MP4: Freeze Frame Segment

Motion, then a one-second frozen segment, then motion again, for freeze detection and VFR edge cases.

File: MP4 · Edges · 480x270
Use case: Conversion testing

MP4: H.264 Clip

A short H.264 test clip in an MP4 container (yuv420p, faststart): the most widely supported web and mobile video format. Video-only and tiny; for testing players, thumbnailers, and MP4→other conversion.

File: MP4 · Mp4 · 480x270
Use case: Conversion testing

MP4: Hard Scene Cut

A short H.264 clip with an abrupt mid-point colour scene cut, for scene-detection and keyframe tooling.

File: MP4 · Edges · 480x270
Use case: Conversion testing

MP4: Hard-Burned Caption

Video with a SAMPLE caption burned into the pixels (not a soft subtitle track), for OCR/caption-burn detection.

File: MP4 · Edges · 480x270
Use case: Conversion testingOCR testing

MP4: Hard-Burned Caption (EN)

Hard-burned EN SAMPLE caption for OCR language tests.

File: MP4 · Subs · 480x270
Use case: Conversion testingOCR testing· Conversion set

MP4: Hard-Burned Caption (ES)

Hard-burned ES SAMPLE caption for OCR language tests.

File: MP4 · Subs · 480x270
Use case: Conversion testingOCR testing· Conversion set

MP4: Hard-Burned Caption Twin

Hard-burned caption twin of the soft-sub clip, for burn-in detection and OCR.

File: MP4 · Subs · 480x270
Use case: Conversion testingOCR testing· Paired fixture

MP4: Landscape 16:9 Twin

Short 16:9 SAMPLE clip at 480x270 for aspect-ratio and social-crop tooling.

File: MP4 · Aspect · 480x270
Use case: Conversion testing· Conversion set

MP4: Landscape Wide

Additional aspect SAMPLE (640x360) for social and player testing.

File: MP4 · Aspect · 640x360
Use case: Conversion testing· Conversion set

MP4: Letterbox Bars

Content framed with black letterbox bars, for autocrop and aspect-ratio tools.

File: MP4 · Edges · 480x270
Use case: Conversion testing

MP4: Pillarbox Bars

Content with vertical pillarbox bars, for autocrop tools.

File: MP4 · Edges · 480x270
Use case: Conversion testing