video bitrate choking the streamer

Running Serviio 1.0.1, WIndows Server 2003 R2 x64, dual core CPU and 8 gig of ram. I have some MKV files that are straight rips from Blu-Ray with HD audio intact. If I try streaming the video from my Windows 7 computer (using the built in DLNA functionality) I can play the movie and the HD audio is shown on my receiver display. If I copy the same file to my Serviio server, the video becomes very choppy as soon as the bit rate exceeds 30Mbps, which Blu-Ray videos do often. Audio is shown as PCM, not the HD stream, and nothing is actually heard from the speakers. DLNA player is a Sony SMP-N200 via wired gigabit network. Transcoding is disabled (won't play at all if I enable it) and using the Sony SMP profile.
Is there any way to limit the video bitrate since I'm not transcoding? I'd love to leave these files in their uncompressed glory, but I need to be able to watch them, and I'd prefer to keep them on my server rather than by workstation, as I have all the hard drive space there. Also, streaming from the Win 7 box to my Panasonic Viera TV is jerky, but I believe that's an issue with the TV accepting such a high bitrate.
Is there any way to limit the video bitrate since I'm not transcoding? I'd love to leave these files in their uncompressed glory, but I need to be able to watch them, and I'd prefer to keep them on my server rather than by workstation, as I have all the hard drive space there. Also, streaming from the Win 7 box to my Panasonic Viera TV is jerky, but I believe that's an issue with the TV accepting such a high bitrate.