If your computer has an HDMI, DVI or DisplayPort output, you might consider connecting it directly to your TV or receiver instead of going over the network through a Blu-ray player or media streamer. (Adapters from DVI or DisplayPort to HDMI are readily available.)
DLNA streaming support tends to be fragile. Too often a video or audio format which plays OK on a computer can't be played through a Blu-ray player. Also, connect your systems together using ethernet cable if you can. Wireless networking is prone to problems, especially dropouts. Wired connections are much more reliable.