I'd suggest looking into MP4 or MKV, but I don't know what's best when coming from WTV. MP4 probably has the best software/hardware of all formats, but with video this is more complicated as it's just a container which will contain a video and an audio format.

MediaMonkey and Plex can handle a large variety of formats (Plex will transcode on the fly if a client doesn't, MediaMonkey is unfortunately more limited in this area).

Old thread but considering 80% of my video collection is WTV....

What format should I convert them to and still usable in Media Monkey, Plex, Windows Media Centre?

I concur with adding WTV support - it would be great to have the media management tools of Media Monkey available for my media center dvr files

+1

I am considering MM as my primary video program for my HTPC because they sound is great. Also, Love the new video codecs. The picture seems much better than the first release.

I would need .wtv support for this.

If it helps, VLC plays .wtv files. FFmpeg (and Handbrake) now convert them. Maybe similar solutions can be implemented.

As "Media Organizer" MediaMonkey should also support wtv-files ("defacto" standard for videos in Windows Media Center)