Extracting audio from DVD movie (Windows)

[vlp_007]

Dears,

following my other post here

I would like to still understand how to extract only audio track from DVD movie without any degradation in terms of quality, size or avoid re-encoding to other video formats and then extracting audio part, etc. In my other post where i was unsuccessfully looking for tool which can do the job in macOS.

Now i have decided to try to look for a tool under WindowsOS.
One recommendation was to try "Pgcdemux" (thanks to ProWo), It did the job, however all three existing audio tracks from DVD had same AC3 file size, odd.

Meanwhile i have tried also to load the DVD vob files into Audacity, you can load only one VOB file, but you can save into AC3. At the end you have to join all AC3 from separate VOBs. What is odd, that the final AC3 file size is very different from the final AC3 file size from Pgcdemux tool.

Based on this findings i am not 100% convinced that one or other software is doing it right.
Please advice, or better enlight me.

Kind Regards,
VLP

[ProWo]

Now i have decided to try to look for a tool under WindowsOS.
One recommendation was to try "Pgcdemux" (thanks to ProWo), It did the job, however all three existing audio tracks from DVD had same AC3 file size, odd.

Why odd? You have extracted 3 audio tracks with different languages, i suppose.
Where is the problem?

[vlp_007]

There were Three languages in total

1) Language A - 1.0 = 163MB AC3
2) Language A - 2.0 = 163MB AC3
3) Language B - 2.0 = 163MB AC3

Why all of them had exact same file size, while each of them is different quality or language

example:
i was expecting something like

1) Language A - 1.0 = 120 MB AC3
2) Language A - 2.0 = 157 MB AC3
3) Language B - 2.0 = 163 MB AC3

[ProWo]

All audio tracks must have the same length of the videotrack to be in synch

[vlp_007]

All audio tracks must have the same length of the videotrack to be in synch

Sure, lenght (timing yes), but size of the exported file also same? What if one track has better quality then other? Why the lower quality track has the same exported file size then?

[ProWo]

I think they have all the same quality.
Post a mediainfo report (text mode) of all 3 ac3 here.

[DB83]

Well you can inspect the files using mediainfo.


But I suspect that each file has the same bitrate. Filesize = runlength * bitrate


Typically you get two types of audio. A LPCM track which will be a significantly larger size due to the bitrate and an ac3 track which is what you see here.

[vlp_007]

I think they have all the same quality.
Post a mediainfo report (text mode) of all 3 ac3 here.

i am sorry you were right! i Moved one of the VOB into mediainfo:
Also i have went and opened other DVD9 and it had different results. So it seems i should stick with Pgcdemux
So, i am sorry for my own mistake. I wanted to have it right


General
Complete name : /VIDEO_TS/VTS_01_1.VOB
Format : MPEG-PS
File size : 1 000 MiB
Duration : 16 min 20 s
Overall bit rate mode : Variable
Overall bit rate : 8 559 kb/s

Video
ID : 224 (0xE0)
Format : MPEG Video
Format version : Version 2
Format profile : Main@Main
Format settings : CustomMatrix / BVOP
Format settings, BVOP : Yes
Format settings, Matrix : Custom
Format settings, GOP : Variable
Duration : 16 min 20 s
Bit rate mode : Variable
Bit rate : 7 813 kb/s
Maximum bit rate : 9 800 kb/s
Width : 720 pixels
Height : 576 pixels
Display aspect ratio : 4:3
Frame rate : 25.000 FPS
Standard : PAL
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Scan order : Top Field First
Compression mode : Lossy
Bits/(Pixel*Frame) : 0.754
Time code of first frame : 00:59:59:00
Time code source : Group of pictures header
Stream size : 913 MiB (91%)

Audio #1
ID : 189 (0xBD)-128 (0x80)
Format : AC-3
Format/Info : Audio Coding 3
Commercial name : Dolby Digital
Muxing mode : DVD-Video
Duration : 16 min 20 s
Bit rate mode : Constant
Bit rate : 192 kb/s
Channel(s) : 2 channels
Channel layout : L R
Sampling rate : 48.0 kHz
Frame rate : 31.250 FPS (1536 SPF)
Compression mode : Lossy
Stream size : 22.4 MiB (2%)
Service kind : Complete Main

Audio #2
ID : 189 (0xBD)-129 (0x81)
Format : AC-3
Format/Info : Audio Coding 3
Commercial name : Dolby Digital
Format settings : Dolby Surround
Muxing mode : DVD-Video
Duration : 16 min 20 s
Bit rate mode : Constant
Bit rate : 192 kb/s
Channel(s) : 2 channels
Channel layout : L R
Sampling rate : 48.0 kHz
Frame rate : 31.250 FPS (1536 SPF)
Compression mode : Lossy
Stream size : 22.4 MiB (2%)
Service kind : Complete Main

Audio #3
ID : 189 (0xBD)-130 (0x82)
Format : AC-3
Format/Info : Audio Coding 3
Commercial name : Dolby Digital
Format settings : Dolby Surround
Muxing mode : DVD-Video
Duration : 16 min 20 s
Bit rate mode : Constant
Bit rate : 192 kb/s
Channel(s) : 2 channels
Channel layout : L R
Sampling rate : 48.0 kHz
Frame rate : 31.250 FPS (1536 SPF)
Compression mode : Lossy
Stream size : 22.4 MiB (2%)
Service kind : Complete Main

Text
ID : 189 (0xBD)-32 (0x20)
Format : RLE
Format/Info : Run-length encoding
Muxing mode : DVD-Video

Menu

[DB83]

Also you may find this easier to use than pgcdemux


https://www.videohelp.com/software/DGMPGDec

[vlp_007]

Also you may find this easier to use than pgcdemux


https://www.videohelp.com/software/DGMPGDec

Thank you for help and patience. I havent really expected that all three tracks will have the same bitrate.
I will continue to learn, and will try the DGMPGDec as well (and compare the results )