Playing webm chunks as standalone video

Question

I\'ve built some code that will get the MediaRecorder API to capture audio and video, and then use the ondataavailable function to send the corresponding webm file blobs up

Answer 1

Only the first blob received from the MediaRecorder API contains a header. So you will need to simply extract it and prepend it to your other blobs to be able to play them as standalone WebM videos. I recommend you to verify whether it works by using tools like hex editor. And you can automate this process on your server.

Answer 2

With MSE, you can load the first chunk containing the WebM segment with track info and what not, and then start loading a cluster later on. The browser will figure it out.

WebM clusters begin with timestamps, which enable this to work.