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Gear / Technical Help => Playback Forum => Topic started by: mizary on May 24, 2007, 02:04:42 PM
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I always though you could only put 16/48 on a video dvd... Also is there any difference between an audio dvd and a video dvd? I'm not talking about DVD-A... but when people put just audio on a dvd that will play in any dvd player.
I'd also seen people say the audio DVD will only hold 2hrs of 24/96 PCM... so it doesn't sound like the authoring app is resampling.
Here is the real question.... If all of the above is true... What does a regular dvd player do with the 24/96? Does it downsample/dither it? Or does it really output 24/96. Does it vary by player?
I'm all confused. I'd always thought the only way to put 24/96 on a disc was to burn a DVD-A disc, which will only play in a DVD-A player.
--mizary
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I use Audio DVD creator and make 24/96 DVD-V discs and it works fine. Player outputs 24/96 and unlike DVD-A, I have not had any compatibility issues with decks...
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Neil Young's two new DVDs have 24/96 audio.
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Now some DVD-V players may only output 48kHz. It may vary depending on the player. Some players may still read a 24/96 source DVD-V (or DVD-A), but may resample the output to something else. YMMV...
Hope this helps...
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How can you figure out what the player is outputting?
Isn't there RIAA restrictions on sending 24/96 over coax/optical? Do you still have to use analog outs like on a DVD-A player to get 24/96? Or does that not matter if the content isn't copy protected.
--mizary
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Best thing to do is either read the specs. of your player or contact the manufacturer. If you have one though, you can hook up a 24bit recorder to the digi output and figure out what signal it is outputting. As for the analog outputs, only the specs. and/or the manufacturer would be able to answer that question. Sorry I can't be more specific. Please provide us with the model you are referring to and some of the internet gurus might be able to shed some light on the questions...
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Isn't there RIAA restrictions on sending 24/96 over coax/optical?
No.
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Now does anybody know about a Linux application that can make DVD-V's with a simple 'dull' video background and my PCM audio?
What could or should I use?
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FWIW: I managed to build a few DVD-video's with PCM audio from the command line, e.g.:
# sox /test3.wav -t raw -x -s -w -c2 -r48000 out.lpcm
# jpeg2yuv -v 0 -f 25 -I p -n 102000 -j "image.jpg"| mpeg2enc -v 1 -q 31 -f 8 -b 1000 -o image.mpg
# mplex -f 8 -S 0 -L 48000:2:16 -o out.mpg image.mpg out.lpcm
# dvdauthor -t -a pcm+16bps+2ch+48khz -c 0,00:10:00,00:20:00,00:30:00,00:40:00,00:50:00,01:00:00,01:05:00 out.mpg -o DVD
# dvdauthor -T -o DVD
# mkisofs -dvd-video -udf DVD > videodvd.iso
# growisofs -speed=4 -Z /dev/dvd=videodvd.iso
(yes I am in PAL land, the example is about audio that is a little over 1 hour)
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Aaaargh!
Both my NAD T524 and the Cyberhome show a buffering problem (again), but this time with the DVD-videos I just created.
When nearing the end of the 1GB VOB there is a slight pause near 01:18:18 or so.
Both on the Cyberhome and the (much more expensive) NAD T524.
(this is with 16/48, what would it be with 24 bits or even 96 Khz?)
Beware!
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If you have one though, you can hook up a 24bit recorder to the digi output and figure out what signal it is outputting.
How would you do that? You mean a 24-bit recorder like the SONY PCM D1 or the R-09? The recorders would record in whatever bit depth you choose. Say the player outputs only 16 bits - if you hook up a 24 bit recorder to its digi output and tape it in 24 bit, the software will show a 24 bit recording.
Or do you mean some kind of 24-bit meter?
Noam
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If you have one though, you can hook up a 24bit recorder to the digi output and figure out what signal it is outputting.
How would you do that? You mean a 24-bit recorder like the SONY PCM D1 or the R-09? The recorders would record in whatever bit depth you choose. Say the player outputs only 16 bits - if you hook up a 24 bit recorder to its digi output and tape it in 24 bit, the software will show a 24 bit recording.
In that case you can look at the samples. a zeroed byte every two bytes indicates that the lowest byte is unused. (a sample consists of 3 bytes per channel, so the upper 16 bits and the lower 8. recording 16-bit at 24-bit will yield zeroes in the lower 8 bits)
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If you have one though, you can hook up a 24bit recorder to the digi output and figure out what signal it is outputting.
How would you do that? You mean a 24-bit recorder like the SONY PCM D1 or the R-09? The recorders would record in whatever bit depth you choose. Say the player outputs only 16 bits - if you hook up a 24 bit recorder to its digi output and tape it in 24 bit, the software will show a 24 bit recording.
In that case you can look at the samples. a zeroed byte every two bytes indicates that the lowest byte is unused. (a sample consists of 3 bytes per channel, so the upper 16 bits and the lower 8. recording 16-bit at 24-bit will yield zeroes in the lower 8 bits)
I don't know how to do that. Can you please elaborate very specifically? I use SF8 - where in SF8 do I look at the samples?
thanks, Noam
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Dunno. I meant to just look at a hexdump of the file.
Maybe others can test with 16-bit audio in a '24-bit' file and have a look?
Maybe statistics can tell something?
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BTW: yesterday, friday, I had another telephone call with NAD electronics (Canada? USA?).
They say I am the only person having issues with their T524 DVD-A player (non-gapless DVD-A playback and now also the skips near VOB end when playing DVD with low-bitrate video and stereo PCM audio). ???
If you have a NAD DVD-player and have noticed the non-gapless DVD-A playback or other issues, please use the support form on their website or give them a call so they get their statistics corrected a little. The phone number is on their site.
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FWIW: I managed to build Lplex (http://audioplex.sourceforge.net/) under Linux.
Lplex is a simple drag-and-drop open-source win32 console utility intended
to provide a free, quick, and hopefully painless way to create a playable full-resolution "audio-only" dvd-video disc from wave or flac audio filesets, with md5 verification and archival content and/or xtract unencrypted lpcm audio streams from dvd-video to wave or flac in an md5-verified process.
I am trying to make the software work (I am new to it) and will post about my experiences.