Example media files hosted at example.hypothesis.donley.xyz for testing HTML video and audio element behavior, buffering, and fast-start optimizations.
A fast-start MP4 has its moov atom moved to the front of the file so browsers can begin playback before the full file downloads. A standard MP4 places the moov atom at the end, requiring a full download first. Test these files in the video streaming experiment →
standardbbb-short.mp4
Short clip of the standard file. Useful for quick tests where the full-length file is too long.
Standard H.264/AAC MP4 with the moov atom at the end of the file. The browser must download to the end of the file before it can read metadata and begin playback.
https://example.hypothesis.donley.xyz/bbb.mp4
fast-startbbb-fast.mp4
Fast-start MP4 with the moov atom relocated to the front of the file. The browser can begin buffering and playing immediately without waiting for the full file to download.