i don't want to have to wait to download the whole (~1GB) video just to start watching it.
i don't want to switch to full screen just to be able to read the text on the presenter's screen.
the streaming video as it is (see below) is useless. useless. you might as well not bother including it. these videos are technical. if we can't read the text on there, we may as well have our eyes closed.