VOB audio

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FLACuncompressed
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VOB audio

Post by FLACuncompressed » Fri Jun 09, 2006 4:25 am

If you own a DVD-Audio or music/concert DVD, there may be Dolby Digital AC3 files included.

How could Max convert AC3 to WAV while retaining multi-channel 5.1?

I edited this question because I wanted to simplify it and add that Mac The Ripper http://www.versiontracker.com/dyn/moreinfo/macosx/22715 will give you an AC3 rather than a VOB which is preferable IMO.
Last edited by FLACuncompressed on Thu Jun 15, 2006 9:40 am, edited 1 time in total.

FLACuncompressed
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Post by FLACuncompressed » Wed Jun 14, 2006 11:53 am

I'd like to convert these Dolby Digital files into a lossless format like WAV. Hopefully when a receiver is connected to the computer it will still see these WAV's as Dolby and direct the speakers accordingly.

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sbooth
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Re: VOB audio

Post by sbooth » Thu Jun 15, 2006 4:03 am

FLACuncompressed wrote:So we have valid 5.1 channel VOB's with AC3. How can we make that into a FLAC with Max?
This is a tough one- scouring the web I've found an application that supposedly converts AC-3 files to WAV, AIFF, etc: http://sourceforge.net/projects/mac3dec/, but I haven't tried it. It is open source so there is a chance it could be included with Max.

BTW, there really isn't good support for multichannel audio in Max. It "should" handle multichannel files correctly, but isn't really tested.

FLACuncompressed
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48k

Post by FLACuncompressed » Thu Jun 15, 2006 8:47 am

http://www.kellyindustries.com/sounds.html

These are my reference Dolby Digital files, particularly Diatonis (which is a pretty soothing track by the way). It would take some heavy shuffling of my equipment to test DTS. Diatonis AC3 48khz and WAV 48khz play as 5.1 Dolby Digital in VLC and iTunes. iTunes converts the WAV to Apple Lossless successfuly.

That Apple Lossless file, being 48khz, cannot be converted by Max. It says that.

FLACuncompressed
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mac3dec

Post by FLACuncompressed » Thu Jun 15, 2006 8:52 am

mac3dec and bd4go i've tried on a non-Intel mac. the archives they are enclosed in don't even open on my Intel mac, they're that old.

http://liba52.sourceforge.net/

the bd4go homepage says liba52 is open source and contains the backend work necessary for conversion. so if you are interested in plugging this hole in Max you have two open source choices plus another OSS http://www.macupdate.com/info.php/id/7996 that's dead in the water as far as can be observed with over a year of no development.

FLACuncompressed
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44khz Dolby Digital conversion

Post by FLACuncompressed » Thu Jun 15, 2006 9:01 am

To test Max without the khz being a problem, I got Diatonis Currents in 44khz WAV from the site I posted before. It's in Dolby Digital multi-channel. The FLAC I made with Max was pops and static and didn't register as Dolby Digital. The AIFF I made showed up as a Dolby Digital signal but was the same disturbing pops and static.

p.s. please note i clarified my original question.

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sbooth
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Post by sbooth » Thu Jun 15, 2006 9:16 pm

I've found some more info- AC-3 WAVE files are not really WAVE files at all. They are actually lossy files with a "magic number" in the bitstream indicating their type. Players such as VLC ignore the actual WAVE header when they encounter these streams, which is why they play correctly. QuickTime and Core Audio do not detect these streams correctly which is why they don't work in Max.

There is a Core Audio plugin at http://trac.cod3r.com/a52codec/wiki that allows AC-3 streams to be decoded. I haven't tried it yet but it looks promising.

FLACuncompressed
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Post by FLACuncompressed » Thu Jun 15, 2006 10:17 pm

sbooth wrote:I've found some more info- AC-3 WAVE files are not really WAVE files at all. They are actually lossy files with a "magic number" in the bitstream indicating their type. Players such as VLC ignore the actual WAVE header when they encounter these streams, which is why they play correctly. QuickTime and Core Audio do not detect these streams correctly which is why they don't work in Max.

There is a Core Audio plugin at http://trac.cod3r.com/a52codec/wiki that allows AC-3 streams to be decoded. I haven't tried it yet but it looks promising.
Thank you.

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