How to merge two mp4 files without losing quality

.mp4mergevideo

I have two high-quality mp4 files, which are of two parts of the same show.

I want to merge them together into 1 file, and I usually use VirtualDub to merge my files… But it doesn't seem to support mp4.

What alternatives are available (especially ones that don't require re-encoding)?

Best Answer

I usually use VirtualDub to merge my files, but it doesn't seem to support mp4. So what alternatives are there?

Avidemux. It's just like VirtualDub, only with more formats supported and built-in codecs and filters. I always use it in preference; it joins AVC+AAC.MP4 files (without recoding) fine for me.

To join them in AviDemux:

  1. File -> Open -> Select File
  2. File -> Append -> Select File
  3. Set all to Copy
  4. File -> Save -> FileName
  5. Wait..

According to AViDemux forums, this join process is lossless (http://www.avidemux.org/smf/index.php?topic=9467.0)