So far, I haven't tried encoding any videos in iTunes, however, my MP4 audio tests I carried out were encoded in iTunes, FAAC (a command line utility) and Nero. The samples encoded in iTunes and FAAC played fine, however, the Nero encoded samples were detected as video files due to the .mp4 file extension (i.e. the video section of Neolink). Here are the 96kbps and 192kbps test samples that were created in iTunes and also confirmed to play on my player:

http://upload.cdfreaks.com/seanbyrne.../itunes_96.m4a
http://upload.cdfreaks.com/seanbyrne...itunes_192.m4a

I will try creating a test video clip in iTunes and in Nero Digital to see how these perform and if successful, I'll post the samples here to try at your end. From what I recall, the player will play Nero Digital encoded video, but only if the audio is encoded as "Low Complexity" MPEG4.

I'm not quite sure why your WMV9 HD samples will not play smoothly over the wired network for you. I tried a handful of 720p and 1080p WMV HD trailers via wired, Wi-Fi, a USB HDD and from a DVD. I got the issue you mentioned when I tried playing any of the trailers over my Wi-Fi network, however, all played without a glitch when I used a wired ethernet connection and also from the USB HDD and the DVD (DVD-RW disc). The only equipment between my PC and the player is the D-Link DGL-4300 gaming router, where the PC and the player are connected to its switch ports.

On the other hand, I do find it quite odd that the player will play WMA Pro as part of a video stream, but not on its own. For example, the following is a 128kbps WMA Pro audio-only file created in Windows Media Encoder, which shows "Invalid WMA file" when I attempt to play it:

http://upload.cdfreaks.com/seanbyrne...128_44sPro.wma