Free Lossless Audio Codec - FLAC
For compressing HD-audio Free Lossless Audio Codec will be used. FLAC stands out as the most widely supported codec, and the only codec that at once is non-proprietary, is unencumbered by patents, has an open-source reference implementation, has a well-documented format, and has several other independent implementations. Also, FLAC decoding is the fastest among lossless codecs and its compression is better of even the most complex codecs.
It is very preferable to use MKV as output format.Reconstructing Blu-ray m2ts container to mkv will allow us to save additional 2 GB or so per movie.
Needless to say, that MKV multimedia container is an open standard, free container format, a file format that can hold an unlimited number of video, audio, picture, or subtitle tracks in one file. It is intended to serve as a universal format for storing common multimedia content.
The less time consuming and the most efficient way to repack your movies is by using beta-free one-click solution MakeMKV. This utility preserves all information but not changing it in any way, so there should be no quality loss.
MakeMKV FLAC Profile
To enable "Profile" dropdown, go to Preferences > General and activate "Expert Mode" in the MakeMKV GUI. To set FLAC as default profile, click on Preferences > Advanced and chose FLAC in the "Default Profile" sub-menu. Be aware, "Advanced" tab is hidden in the "Preferences", so you need to enable "Expert Mode" first, to make it visible.
Not long time ago decoding DTS-HD Master Audio was a problem since open source decoder was missed. In order to convert DTS-HD, MakeMKV needed a so-called reference external decoder library. But this changed starting from version 1.9.3. Now MakeMKV uses an open source DTS-HD decoding library, without the need for any additional files. So to make conversation process more efficient and less time consuming, make sure you are using MakeMKV version 1.9.3 or above.
Let's move on and see some real numbers now: