I have two high bitrate video files in .m2ts format with exactly the same codec, resolution etc.
How do I join them together into a single m2ts file without any re-encoding and quality loss?
What is a good freeware program to use for this?
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However, I get audio sync issues in the output file.
The first part is perfect, except when 2nd part of the video starts, the audio is immediately out of sync. It's early by about 2 seconds.
And the audio isn't out of sync in the original 2nd part videofile.
How can this be fixed?
Every single aspect of the files has to match up exactly for it to turn out correctly. What I do is I don't bother joining I just name the files in such a fashion that the player will play them one after the other. It takes a second or two to switch over but it really isn't that bad.
If they are files you recorded most likely they should match up. I use VideoRedo to join files but that is a program you have to buy.
Perhaps do a MediaInfo specs look at each file side by side and see if there is any slight differences.