For encoding I recommend to use MeGUI or Xvid4PSP. MeGUI you can encode any video files like MP4, MKV, AVI, and etc. to MKV or MP4. You can update MeGUI to the program directly you don't need to search for the codec. Xvid4PSP you can encode any video files like MP4, MKV, AVI, and etc. to MP4, MKV, AVI, and etc. and also you can demuxing video files like MKV or you encode to Audio only like AAC, AC-3, MP3, FLAC and etc. but you need to manually update the codec. ____________________________________________________________________________________ If you have a part video like .001, .002, and etc. I recommend you to use HJ-Split you can join a parted files like .001, .002, .003, and etc. and also you can split a large files to .001, .002, and etc.