Once merged, you can play your long file using versatile media players like VLC Media Player or MPV , which have built-in support for MKV containers and complex subtitles. MakeMKV 1.4.10 Released – HD Audio, Here We Come
To provide a "long piece" (a single, continuous file) from multipart MKV files—such as a film split into three parts like —the most effective method is to "append" or "merge" the files into one. Once merged, you can play your long file
This process is generally called , which combines the data streams into a new container without re-encoding, ensuring no loss in video or audio quality. 1. Merging Files with MKVToolNix Once merged, you can play your long file