Have a couple of video on SDHC - different formats, different resolutions.

After upgrade to 51.1 there were a lot of problem with video playback - anything, which is described in this thread.

Did reinstallation of Extended Decoder Support - the situation was still the same - chaotic playing, play rejection etc.

Finally I took a breath and start looking systematically - which file doesn't play etc. Each time between playback I started some video which I did by backside camera - just to check which video file is cause.

But! After while the problem disappeared - most of video started playing good, no bad effects etc. Moreover, no annoying system crashes during playback of some .mkv, and some files which didn't play even in KMPlayer starts playing in in it and in regular media player. So, now only MPEG1 video doesn't play but I think I will re-install mpeg2dec (which calls libmpeg2-4) and test. In 42-11 it played well.

So, conclusion - until tracker finishes a processing of video files you may expect a lot of video problems... because tracker uses the same video hardware as media player. After that - anything playes good.

EDIT: I didn't try streaming video - my media player never shows any media from windows system or whatever. I never knew about it. May it be a non-US version feature?