However I have just copied a SD video from my new Humax to my PC (over ethernet) and it seems to be identical to the same file copied via USB.
To copy the file to my PC I switched on "Sharing" on the Humax. The Humax then showed up on Windows Media Player and I could see the Humax video files in WMP. I right clicked the video and selected Properties, then copied the file's "Location" to Firefox browser which then gave me the option to save it to my PC's hard drive @ around 5.7 MBps.
Fair enough, I wasn't aware that would be the case. As the stream has to be sent by reading the file and then transmitting the content through a variety of processes, I had expected there might be at least a few bytes added or taken away somewhere along the line.I have checked a TS file transferred by this method and the same TS transferred using USB and they were identical. (I used the DOS command line utility 'fc' to do a binary comparison.)