Using the media source extension, is it possible to do buffering in a way that buffers don't start with a key frame, but with a normal frame?
For instance, is it possible to buffer the video frame by frame? (Not saying that would be very smart to do!)
It is possible but obviously you won't be able to see video until you feed it with a key frame.
Having said that, there is currently a limitation in Chrome causing failure to play video if fragments don't start with a key frame. see here: https://bugs.chromium.org/p/chromium/issues/detail?id=229412