demo · v136

Codec String Builder

The H.26x MIME strings are notoriously hairy — avc1.42E01E vs. avc3.640028 vs. hev1.1.6.L93.B0. Pick a family, profile, level, tier, and parameter-set mode; the builder emits the full type string and runs it through MediaRecorder.isTypeSupported() in real time.

Note: the recorder calls only succeed on platforms with a matching hardware/software path. Codec strings with avc3/hev1 require Chrome 136+ for the MediaRecorder mid-stream resolution path.

family

profile

level

container

audio codec (optional)

MediaRecorder.isTypeSupported()—

MediaSource.isTypeSupported() (playback)—

HTMLMediaElement.canPlayType()—

see also