HDMI Audio Capture

[krassyg]

I managed to record Dodlby Digital 5.1 from my cable box using Blackmagic Intensity HDMI capture card. The file produced is a wave at 48Khz. I then used besplit to extract to an .ac3 file. The file plays fine, but it is 6 second shorter than the original video. Is there another tool that does the same thing as besplit?
If not, how can I extend the play time of the AC3 file?

Thanks in advance,
Chris