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Timecode and colour bars

Frame counter over SMPTE-style bars. The number on screen is the frame index, so a dropped frame or an audio offset is visible without tooling.

Switching rendition keeps the current position and the paused state, so the same frame can be compared across the ladder.

Direct URLs

HLS

Multivariant playlist with fMP4 segments, four second target duration, EXT-X-PLAYLIST-TYPE:VOD. The CODECS attribute of each variant is read back from the encoded file rather than assumed, because an overstated level makes some players refuse a rendition they could have played.

/media/timecode/hls/master.m3u8

Safari and iOS play this natively. Chrome and Firefox need a player such as hls.js — see the HLS notes.

Technical detail

Other streams

• Smooth gradients
• High motion, 60 fps
• Sustained download