Can I stream mkv files from my computer to the Roku 2?
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If you want to playback video from your PC or Mac, you likely need to look at a different box. I think the current list of recommended options includes the Boxee Box, the Netgear Live or the new Sony thingamabob.
To solve Roku won't play MKV files issues; a recommended fix is to convert Roku unsupported MKV to Roku more compatible MKV or MP4 at www.idealshare.net/video-converter/roku-mkv.html
Brorsoft Video Converter is a ideal solution for you. The software has a codec pack that enables conversion between different video and audio file formats, it can convert AVI, VOB, MOV, MKV, FLV, MPG, etc to Roku supported file format such as mp4 with the best quality.
If you're facing problems playing MKV via Roku, you'd better convert MKV to Roku compatible video format like H.264 encoded MP4 files. I've also encountered the probems you have, finally I found EaseFab Video Converter ( www.easefab.com/video-converter/ ) to solve the problems, it worked perfectly. You can also use Handbrake to do that, however, it runs so slow.