Aiseesoft BD to MKV Copy is an ideal tool to help you to backup any Blu-ray movies to MKV format files or Blu-ray movies to MKV format. And you are also allowed to select subtitles and audio tracks and packages the contents into MKV container without transcoding. Key function 1.Extract Blu-ray movies to MKV for backup With the help of Aiseesoft BD to MKV Copy, you can backup your favorite blu-ray movie from Blu-ray disc or Blu-ray folder to mkv format file with lossless 1080p HD video stream, multilingual subtitles and original Blu-ray HD audio. 2.Backup 3D Blu-ray movies to MKV It also supports to copy 3D Blu-ray movies to MKV video format. 3.All audio/subtitle tracks kept This Blu-ray to MKV copy software can copy Blu-ray movies to MKV files without damaging original multiple audio tracks (especially HD audios- Dolby TrueHD 7.1/5.1, DTS-HD Master Audio 7.1/5.1, Dolby Digital 5.1) and multiple subtitles. 4.Set multi-audios and subtitles You can easily select audio/subtitle tracks you need or uncheck the audio tracks and subs streams to preserve audio tracks and subs in multiple languages. 5. Powerful preview function The preview function is convenient for you to view the Blu-ray movies before backup and also you are allowed to select audio/subtitle track to preview movies. Plus, this Blu-ray Copy software can capture your favorite image with the "Built-in-player".