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How to rip audio from DVD/DVD Audio

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astromo:
I've used MakeMKV to losslessly rip (i.e. transcode) DVD / BluRays to mkv. Then I've used MC to extract the audio stream via Convert Format as per the Wiki. Using this method I've converted from PCM (contrained in the mkv) to FLAC as a standalone audio file. From memory, the file size of the audio component halved (-ish) as is typical when ripping a CD to FLAC or APE.

The trick is to play the video and select the audio stream you're after. That then locks in the audio stream that Convert Format works with.

That may explain the comment about "not a lossless conversion". From the Wiki entry's opening sentence:

--- Quote ---MC has a high quality conversion engine, that can be used to transcode from one format to another
--- End quote ---

Where's the evidence that this is not the case?

RD James:
1. Ripped concert DVD Video containing 5.1 audio track to MKV using MakeMKV: 1.76GB
2. Removed video from MKV file using MKVToolNix, creating an audio-only MKA file with chapter markers: 466MB
3. Converted the MKV file to FLAC using Media Center's "convert video to audio" option, creating a chapterless FLAC file: 2.24GB

The 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.

JimH:
Maybe the source was lossy?

RD James:

--- Quote from: JimH on December 16, 2017, 01:55:24 am ---Maybe the source was lossy?

--- End quote ---
Yes, AC3 and DTS are compressed formats.
With MKV/MKA you can rip out the audio without altering it.
 
In Media Center your only option is to convert it to PCM in a lossless file container, or to a different lossy format like MP3.
Both of these conversions incur further loss, while also inflating the file size.
 
Media Center is fine for ripping Blu-ray audio if it's DTS-HD or TrueHD - though it doesn't preserve chapter information.
But it's not what I would recommend to rip the audio track from a DVD Video disc, and it doesn't support DVD Audio discs at all.

jmone:
Incorrect.  There is no loss decoding AC3 or DTS to PCM.  That is how playback works...it's just decoding.  If saving as FLAC it will be a lossless version of the PCM, and sure the resultant file will be bigger but will be accurate.

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