Thanks for all your replies so far, it has been quite a healthy debate. John Shutt mentioned the "Masked Engineer" - I haven't noticed him on this list before, is there a thread with his (I assume it is a he) exploits. The option of using a lookup table for which frames to drop appeals but as there are 2,071,528 frames in a day you would need 258,941 bytes to hold this, that might be noticed even on a PC. You could optimise this by realising that it is only the 00 and 01 frame values that would be dropped. The idea of dropping every 1001 counted frame would be OK but we need an algorithm that ensures that everybody always drops the same framecount numbers even if they start from different timecodes. So you can't start from 10:00:00:00 and drop every 1001st count, you have to calculate what the count would be at 10:00:00:00 (modulo 1001) and start from there. I have had contact with Evertz and they have confirmed that they do not implement 23.97 fps drop-frame timecode. If nobody else is implementing 23.97 drop-frame am I worrying too much (or is it just too soon)? Thanks again - Russ Wood ________________________________________________________________________ This e-mail has been scanned for viruses by MessageLabs. ---------------------------------------------------------------------- You can UNSUBSCRIBE from the OpenDTV list in two ways: - Using the UNSUBSCRIBE command in your user configuration settings at FreeLists.org - By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word unsubscribe in the subject line.