I've gotten this extension installed and working, but I am very confused with (local) MP4 video handling. Please give me a clue.
1) Is it possible to upload an MP4 (HTML5, right?) video that can be played without transcoding it to some other (OGV?) format?
2) Is it possible to have the video (auto)play inside the page without the "lightbox" player popping up?
Thanks in advance.
Autoplay is currently being worked on phab:T116501, but non-autoplay videos will get the lightbox player regardless.
Maybe Extension:EmbedVideo (fork) will serve you better than TimedMediaHandler, though. It appears it allows autoplay and embed the inline player, without generating derivative transcodings.
And mp4 handling by TMH isn't really well tested/validated, because mp4 is not in use by Wikimedia.