That will of course involve transcoding the video, so you'll need to increase the bitrate slightly in order to keep the quality as close to the source file as possible. According to AViDemux forums, this join process is lossless ( answers Top answer: I usually use VirtualDub to merge my files, but it doesnt seem to support mp4. Here are some FOSS ones that would do the trick: File -> Append -> Select File Set all to Copy File -> Save -> FileName Wait. If you need to be more precise, you're going to need an actual editing program to do it. I've usually had good luck with it myself before! I was kind of hoping that given that intro sequences and 'previously on' sections end on black that your files would have keyframes close enough to where you want them, which is why I didn't think to bring it up.

The advantage of that is that it's lossless (hence the name), trimming the video files without requiring transcoding so no quality loss and no change to the files bitrate, and it's very fast. Lossless cut can only cut on keyframes in the video file, not every frame is a keyframe so your edits will be snapped to the closest one. I recommended that to you so I'm responsible for this one (sorry!)

Can i merge videos in losslesscut