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Full Version: 48kHz/20bit = only noise in fb2k
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Xenion
i ripped the PCM track from a dvd to my harddrive. the dvd decrypter program says it is a 48khz/20bit file. foobar can't play the file. when i open it there's only noise in it. the file info says "16bit", although i'm pretty sure it's a 20bit file. i also can't open the file with any other program (wavelab, windvd, wmp, cooledit etc...)

i tried to disable the resampler and i tried the option 20bit to 24bit fixed point but it still doesn't work...

is there a chance to get this file be played with foobar?

my soundcard is creative extigy (maybe it doesn't support 20bit?)

edit: whats strange about it is the fact that when i chose PCM in the dvd menü it works but when i rip that pcm track from the dvd it doesn't work anymore. but i have ripped many dvds (in pcm) with this program and i never had any problem
Peter
Please post sample files. I have no idea what's inside of those 20bit files. It has nothing to do with your hardware for sure, everything is internally converted to floatingpoint then to specified output bit depth.
tigre
Have you tried LPCM24 (follow the instructions in the readme) from rarewares/others section?
Xenion
here's a sample http://www.on-air.info/noise.rar

maybe this is a demuxing problem from the dvd decryption programm itself, because, when i make a direct stream copy of the lpcm audio track (.vob file then), windvd plays it.
Xenion
QUOTE(tigre @ Mar 9 2004, 11:58 PM)
Have you tried LPCM24 (follow the instructions in the readme) from rarewares/others section?

i ripped the file in raw mode in dvd decryptor and then used this tool. conversation to 24 bit works but still noise. the 48khz switch doesn't help either
tigre
Have a look at the last post in this thread. It seems like Amstel has found a method to get playable .wav files from 48kHz/20bit DVD-V audio.
Xenion
QUOTE(tigre @ Mar 10 2004, 12:30 AM)
Have a look at the last post in this thread. It seems like Amstel has found a method to get playable .wav files from 48kHz/20bit DVD-V audio.

interessting. this really works. i wonder at which point the conversation from 20 to 16 is. i'm not very experienced but from my understanding the .VOB file is a sort of container format that can have several movie and audio tracks in it. the VOB file of my DVD has two audio tracks. a 20bit LPCM track and a 5.1 AC3 track. now i have extracted a 16bit file from the VOB file. at some point it must have been converted.

but anyway thank you for finding this solution!
i'd still like to see foobar to be the only player that can play those 20bit files.
tigre
Maybe it would be helpful if you could upload a matching part of the working 16bit .wav file (-> the beginning of both files? wink.gif ) in case someone is interested in finding out how to play back the 20bit files. BTW: I guess filesize-wise both versions have a relation like 16:20? If you could confirm this, it would be helpful too...
Peter
According to the header of this WAV, the data in it is 16bit, not 20bit. I don't think I can make this work; if this file isn't 16bit then the app that wrote it is broken.
There are other symptoms of broken WAV writer as well (missing chunk sizes).
cyrano
see here at doom9.org smile.gif
Xenion
ok, i ripped a song which is 1:19 long. it's 17,8 MB big

18676964 byte * 8 bit/byte = 149415712 bit
1:17 = 77 seconds

149415712 bit / 77 sec = 1940463,8 bit/sec
makes something like 1,9 mbit/sec

that's too big for a normal 48khz/16bit file. (48khz 16bit = 1536 kbps = ~1,5mbit/sec)

the file is indeed broken. i had no chance to cut it properly, because no programm opens it. i'm uploading you a comlpete song now, zZzZzZz (~18MB)
i will send you the links via pm because of my traffic...

maybe this can help.
Xenion
now thats interessting. the 20(?)bit wav files really contain music. i made a file where you can where you first hear the real music and then the 20bit digital-noise track. you will recognize the guitar and the voice. but everything it slower that the original speed. don't turn your speakers too loud, the noise is near clipping.

http://www.on-air.info/clip.ogg
kode54
Maybe whatever you are using to rip that is dumping a packed bitstream into the WAV file, and I don't think WAV is designed to handle packed samples if they aren't an even number of bytes. Of course, we'll have to wait and see what that sample contains...
Peter
Header still claims 16bit data, chunk sizes are off by 32 bytes.
This is not a valid WAV file, I simply can't make this kind of stuff play because i would have to break valid 16bit WAV files in order to do so (still no idea about data contained in it).
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