With the current OF branch the videoPlayer examples only work with Emscripten, if I use ofSoundStream (before loading the video player) in ofSetup. Somehow that was not needed before...

Thats the error without ofSoundStream:

Uncaught ReferenceError: AUDIO is not defined
    at _html5video_player_create (videoPlayerExample.js:1:183919)
    at ofxEmscriptenVideoPlayer::ofxEmscriptenVideoPlayer() (videoPlayerExample.wasm:0x4605f)
    at ofApp::setup() (videoPlayerExample.wasm:0x908f4)

AUDIO is defined in https://github.com/openframeworks/openFrameworks/blob/master/addons/ofxEmscripten/libs/html5audio/lib/emscripten/library_html5audio.js and used by the videoPlayer, because it uses the same audioContext (which is needed for panning for example)...