I am new to TMPGENC, having used Ulead 6.5 previously. I like the much faster encoding/conversion speed of TMPGENC vs Ulead, but I don't understand why it does the following: I have several 5 to 10 minute MPEGs which were captured/converted to MPEG2 using Ulead products. Now I want to join them using Tmpgenc MPEG tool. I add all of them to the "Merge" list and click Run. It rejected some of them as being a different format than the rest. I tried running some of them back through the Ulead file conversion and that worked for some but not all. So, I spent the time to run each and every one of the clips through the encoding process in Tmpgenc, making them all standard MPEG2's. I then reload them all into the MPEG tool and it still rejects some of them as not being the same format. How can I get around this or am I doing something wrong? Thanks in advance for any help.