1. Ripped concert DVD Video containing 5.1 audio track to MKV using
MakeMKV:
1.76GB2. Removed video from MKV file using
MKVToolNix, creating an audio-only MKA file with chapter markers:
466MB3. Converted the MKV file to FLAC using Media Center's "convert video to audio" option, creating a chapterless FLAC file:
2.24GBThe converted file is not only 4.8x larger than the audio-only MKA file, it's almost 30% larger than the source file containing the video.
This is because it's converting a DTS-encoded track to PCM.
Not only that, you lose chapter markers and can't bitstream the FLAC-converted file over an S/PDIF connection either. (though Media Center does not currently support bitstreaming MKA files if I recall correctly)
You won't have this problem with Blu-rays if they're using TrueHD or DTS-HD tracks, because those are lossless PCM formats which are typically less-compressed than FLAC files.
But you shouldn't use Media Center to do this with DVDs (or Blu-rays) that use AC3/DTS tracks.