3.mkv -

A single, "long piece" MKV file will be created in seconds because no conversion is taking place. 2. Alternative: Command Line with FFmpeg

Open MKVToolNix GUI and drag your first file (e.g., 1.mkv ) into the "Source files" section. A single, "long piece" MKV file will be

Create a text file named inputs.txt containing the file names in order: file '1.mkv' file '2.mkv' file '3.mkv' Use code with caution. Copied to clipboard Run the following command: ffmpeg -f concat -safe 0 -i inputs.txt -c copy output.mkv Use code with caution. Copied to clipboard Create a text file named inputs

The -c copy flag ensures the streams are copied directly, preserving original quality and speed. 3. Handling Seamless Branching (Blu-rays) preserving original quality and speed.

Right-click the file you just added and select "Append files" . Select the remaining parts (e.g., 2.mkv and 3.mkv ) in their correct sequential order.