Merging several videos to one is rather trivial, when you have the right tools. We're going to use the excellent DV-Tool, which, among other features, has an "MPEG aware" cut & merge tool.
You have to make sure that the videos you are combining are encoded and multiplexed in the same way. You can use MPEG Properties to verify that.
Download DV-Tool from the link above, unzip it to a folder of your liking and run it. Then choose the File Processor 2.31 tab, and check the Merge files radio button.
Open the files to be merged
Click the Add element button and choose the files you want to merge. You can change the order of the files using the two arrow buttons.
Choose the output file
Click the Output file: (or mask) .. and choose the path to save the file.
All set to go
Just click Start and wait for the magic to happen!
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Written by: Jari Ketola