i used Replay Media Catcher before.
Sometimes when u record the stream from cam4, u will find some videos have no right duration after finished. For example, the timestamp maybe start with no 0:0:0 instead 00: 04:01 or any other.

Now i find a wonderful tool: E.M. Youtube Video Download tool.
It works great, too. also it can fix the timestamp. and with the right duration.

hope this can help