My provider doesn't grant access to the advanced menu in my Mag254, therefore I can't find the option to adjust buffersize. Is there an ssh command I can use to do it manually? I do have root / ssh access.

This write up assumes you have: Mag254 IPTV box, and know the ssh root login password (default is 930920). HDPVR from Haupauge (1211/1212). Working MythTV backend Working Mythweb confuration HDMI to Component converter. I used this one...