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Gear / Technical Help => Post-Processing, Computer / Streaming / Internet Devices & Related Activity => Topic started by: taper420 on February 26, 2008, 11:08:21 AM
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As far as I can tell the only way to author a surround sound DVD is with a lossy codec.
Is there some way to make a surround mix with full lossless 24 bit files? On a standard DVD-V.
And if so what kind of software should I be looking for.... on a mac? Right now I have the latest FCP studio, but can't find a way to do it.
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With lossless 5.1 24bit surround sound you could fit only one hour of sound on the disk and no video...
uncompressed 16/44 PMC is about 600 MB/h, 24/48 about 1 GB/h. DVD capacity is 4.7 GB. Simple math.
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As far as I can tell the only way to author a surround sound DVD is with a lossy codec.
Is there some way to make a surround mix with full lossless 24 bit files? On a standard DVD-V.
And if so what kind of software should I be looking for.... on a mac? Right now I have the latest FCP studio, but can't find a way to do it.
Surcode may do the trick, but I think they have a Mac version for only one of their products...
http://www.surcode.com/
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As far as I can tell the only way to author a surround sound DVD is with a lossy codec.
Is there some way to make a surround mix with full lossless 24 bit files? On a standard DVD-V.
And if so what kind of software should I be looking for.... on a mac? Right now I have the latest FCP studio, but can't find a way to do it.
Surcode may do the trick, but I think they have a Mac version for only one of their products...
http://www.surcode.com/
Thanks... it seems that the MLP lossless encoder they have may only be applicable to DVD-A's. And it's $2500.
So technically possible but not economically feesable for a hobbiest.
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there's an open source program - can't remember what it's called - I downloaded it a while back (on my laptop - that's why I can't look it up) but haven't had time to figure it out. Seems like it's command-line only (no GUI). If you go to sourceforge.net and search for "dvd audio" you'll probably find it.
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There is no way you can fit lossless 5.1 on a standard DVD, the maximum allowed data rate can not accomodate it. At least if you want to have any decent video to go with the audio.
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There is no way you can fit lossless 5.1 on a standard DVD, the maximum allowed data rate can not accomodate it. At least if you want to have any decent video to go with the audio.
I don't necessarily follow or agree with your math, with the right encoders.
Earlier you quoted ~600MB/hr for 16/44.1 PCM. Of course that's stereo, and completely uncompressed. So going from 2 tracks to 6 tracks, you are now at ~1800MB/hr. But FLAC or other LOSSLESS compression algorithms can usually get a file down to about 60% of its original size. The center channel should be highly correlated with left and right, so you'd probably get better compression there. By definition there's a very limited frequency range to worry about in the .1 channel, so that should compress very well as well. So maybe 1GB/hr of lossless 5.1 channel 16/44, if not better. So you could make a two hour disc with over half the storage space devoted to video.
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How about the maximum data rate specified in the DVD standard?
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How about the maximum data rate specified in the DVD standard?
How about it?
1GB/hr audio ~= 1,000 MB/hr = 16.7 MB/min = .277 MB/sec
1x DVD data rate = 1.32 MB/sec.
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live and learn...
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I tried doing this a while ago. Used Audacity to output the six channels of 5.1 audio to Flac files, then burned to a DVD video disc using LPLEX. The DVD video disk standard does support this (at 48khz and up to 24bit). Next step was to find a player. This is not supported over S/PDIF, and I could find no player with the necessary 6 d/a converters. I suspect a DVD audio player with analog outputs could handle this, but have not tried. I tried contacting tech support for various manufacturers to try and find one that made a player that supported this DVD video standard, but they either didn't reply, or if they did reply, the reply was worthless. I resorted to DTS encoding in the end.