You're right, Stan - it certainly isn't.
BD legal resolutions are as follows:
i/. 1920x1080 (aka"Full HD") allowing frame rates of 29.97i, 25i, 24p and 23.976p
ii/. 1440x1080 allowing frame rates of 29.97i, 25i, 24p and 23.96p
iii/. 1280x720 allowing frame rates of 59.94p, 50p, 24p and 23.976p
iv/. 720x576 allowing a frame rate of 25i
v/. 720x480 allowing a frame rate of 29.97i
Source files sound to me like massively lossy compressed - HD equivalent of DivX (do you remember the aggravation we used to get with DivX and XviD files?) or something very similar. Whilst it is possible to get 10 hours of HD footage on a BD, you will need to do some serious bit budgeting and because you will be recompressing something already heavily compressed the results will be unpredictable