Boy, was that a journey to get the streaming to work in the new server. First I ventured to install win2k, thought that maybe it's better and lighter than windows xp. The end result was that I could not get any transcoding to work during one evening while drinking some necessary bottles of installation refreshments. Streaming .mp4 files and so on still worked.
Well, after well slept night I installed windows xp this morning, exact same codecs from same files in same order and presto. ALL tested files worked out of the box either streamed as is or transcoded. Damn, I'm one happy camper now.
So what I have now is winxp+tversity. So far all tested divx, xvid, .mkv, .mp4 files work. Content not understood by ps3 is transcoded to 1280*720 resolution in mpeg2. All formats supported by ps3 are streamed as is.
The one problem I have left is that it seems my server isn't fast enough to transcode 720p content to mpeg2 on the fly. The playback stutters every few seconds. It isn't a real problem for me as I can remux those files without loss in quality. Remuxing with ps3 video9 is super fast and conviniently easy. Main thing is that all "lowres" stuff and regular divx/xvid files work with on the fly transcoding.
If needed I can post links to codec packs I installed and create small tutorial in which order to install. The link to tversity forums in earlier post should be enough though, all necessary info and configuration advice is there.
Oh, and about the fast forward/rewind. That I guess format dependant. For natively supported formats both fast forward/rewind works perfectly. For all tested transcoded content 1.5 fast forward worked. For some 10 times fast forward worked too. I guess it's cpu power limitation. Rewind doesn't work so hot, for me it always skips to the beginning of transcoded clip. Oh, and I guess I ran into cpu limitation in the 1.5 fast forward because it introduces some hiccups to playback which are not present in regular speed playback.