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Vas Crabb
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Reged: 12/13/05
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Re: DU: The great laserdisc flood
05/13/18 05:55 AM


> Even so, that would still be lossy.
> There is no way to go from analog to digital without quantisation loss.
> LaserDisc is analog. AVI (or whatever) is digital.

While technically correct, that's not really a useful thing to say. Any analog signal will have some level of noise. Beyond a certain point, increasing bit depth just captures the noise in more detail - it doesn't capture any more information from the signal. Similarly, if a signal is band-limited you gain no information by increasing the sampling frequency once it's past twice the highest-frequency component of the source material.

In a LaserDisc, there are only two levels (pit/land). The noise comes in from manufacturing tolerances that cause the lengths of the pits to vary, and ageing effects on the discs as they distort from temperature changes. You only need 1-bit samples of a sufficiently high frequency that the period between samples is smaller than the manufacturing tolerances of the pressing process to get an effectively lossless capture. Increasing the sample rate would capture noise in more detail.

Separating the carriers and demodulating the audio and video is inherently lossy. Any conversion to an A/V container format, even using lossless codecs, is going to be lossy as it requires carrier separation and demodulation. The archival dumps will not be in an A/V container format.

I don't know what the exact figures you need to get an effectively lossless capture of a LaserDisc, but I trust that the guys working to archive the Domesday Project material know what they're doing.







Entire thread
Subject Posted by Posted on
* DU: The great laserdisc flood SmitdoggAdministrator 05/12/18 08:39 PM
. * Re: DU: The great laserdisc flood Kitsune Sniper  05/15/18 06:33 AM
. * Re: DU: The great laserdisc flood btribble  05/18/18 04:42 AM
. * Re: DU: The great laserdisc flood Kitsune Sniper  05/18/18 07:44 AM
. * Re: DU: The great laserdisc flood Simon Inns  05/15/18 07:10 AM
. * Re: DU: The great laserdisc flood JonasP  05/15/18 02:01 PM
. * Re: DU: The great laserdisc flood MooglyGuy  05/15/18 04:20 PM
. * Re: DU: The great laserdisc flood Simon Inns  05/15/18 04:43 PM
. * Re: DU: The great laserdisc flood swm3rd  05/16/18 09:03 PM
. * Re: DU: The great laserdisc flood R. Belmont  05/16/18 10:39 PM
. * Re: DU: The great laserdisc flood jonwil  05/19/18 02:32 AM
. * Re: DU: The great laserdisc flood MooglyGuy  05/19/18 10:29 AM
. * Re: DU: The great laserdisc flood Olivier Galibert  05/17/18 11:43 AM
. * Re: DU: The great laserdisc flood happycube  05/18/18 05:19 PM
. * Re: DU: The great laserdisc flood Kitsune Sniper  05/17/18 09:33 PM
. * Re: DU: The great laserdisc flood Roberto Fresca  05/17/18 08:46 PM
. * Re: DU: The great laserdisc flood DoomSooth  05/17/18 01:01 PM
. * Re: DU: The great laserdisc flood agard  05/14/18 07:57 PM
. * Re: DU: The great laserdisc flood gregf  05/14/18 08:56 PM
. * Re: DU: The great laserdisc flood StilettoAdministrator  05/15/18 12:29 AM
. * Re: DU: The great laserdisc flood gregf  05/15/18 12:35 AM
. * Re: DU: The great laserdisc flood agard  05/15/18 12:15 AM
. * Re: DU: The great laserdisc flood gregf  05/15/18 12:30 AM
. * Re: DU: The great laserdisc flood JustNiz  05/15/18 03:20 AM
. * Mad Dog McCree! gregf  05/14/18 04:52 AM
. * Re: Mad Dog McCree! gamerfan  05/18/18 04:31 AM
. * Re: Mad Dog McCree! *=/STARRIDER\=*  05/14/18 04:56 AM
. * Re: Mad Dog McCree! Antny  05/14/18 06:07 AM
. * Re: Mad Dog McCree! gregf  05/14/18 05:02 AM
. * Re: Mad Dog McCree! Antny  05/14/18 06:11 AM
. * Re: DU: The great laserdisc flood casm  05/13/18 02:33 PM
. * Re: DU: The great laserdisc flood italiandoh  05/13/18 12:57 PM
. * Re: DU: The great laserdisc flood f205v  05/13/18 05:01 PM
. * Re: DU: The great laserdisc flood italiandoh  05/14/18 10:03 PM
. * Re: DU: The great laserdisc flood *=/STARRIDER\=*  05/13/18 05:46 PM
. * Re: DU: The great laserdisc flood italiandoh  05/14/18 10:04 PM
. * Re: DU: The great laserdisc flood *=/STARRIDER\=*  05/15/18 05:09 AM
. * Re: DU: The great laserdisc flood RdW  05/14/18 02:30 AM
. * Re: DU: The great laserdisc flood *=/STARRIDER\=*  05/14/18 06:26 AM
. * Re: DU: The great laserdisc flood *=/STARRIDER\=*  05/14/18 02:52 AM
. * Re: DU: The great laserdisc flood CTOJAH  05/13/18 11:25 AM
. * Re: DU: The great laserdisc flood taz-nz  05/14/18 11:32 AM
. * Re: DU: The great laserdisc flood Kitsune Sniper  05/14/18 06:15 PM
. * Re: DU: The great laserdisc flood Roman  05/14/18 06:21 PM
. * Re: DU: The great laserdisc flood Kitsune Sniper  05/14/18 07:39 PM
. * Re: DU: The great laserdisc flood Simon Inns  05/14/18 07:59 PM
. * Re: DU: The great laserdisc flood gregf  05/14/18 09:41 PM
. * Re: DU: The great laserdisc flood JustNiz  05/15/18 02:38 AM
. * Re: DU: The great laserdisc flood Vas Crabb  05/15/18 08:04 AM
. * Re: DU: The great laserdisc flood Olivier Galibert  05/15/18 07:21 AM
. * Re: DU: The great laserdisc flood Kitsune Sniper  05/15/18 04:23 AM
. * Re: DU: The great laserdisc flood Tornadoboy  05/13/18 03:15 AM
. * Re: DU: The great laserdisc flood CTOJAH  05/13/18 11:15 AM
. * Re: DU: The great laserdisc flood StilettoAdministrator  05/14/18 12:28 PM
. * Re: DU: The great laserdisc flood CTOJAH  05/14/18 04:23 PM
. * Re: DU: The great laserdisc flood StilettoAdministrator  05/14/18 07:54 PM
. * Re: DU: The great laserdisc flood italiandoh  05/13/18 12:46 PM
. * I'm excited like a fridge MASH  05/13/18 02:47 AM
. * Re: DU: The great laserdisc flood Master O  05/13/18 02:37 AM
. * Re: DU: The great laserdisc flood btribble  05/12/18 11:36 PM
. * Re: DU: The great laserdisc flood SmitdoggAdministrator  05/12/18 11:41 PM
. * Re: DU: The great laserdisc flood btribble  05/14/18 06:40 AM
. * Re: DU: The great laserdisc flood Kitsune Sniper  05/12/18 11:35 PM
. * Re: DU: The great laserdisc flood MooglyGuy  05/13/18 07:15 AM
. * Re: DU: The great laserdisc flood Kitsune Sniper  05/14/18 07:38 AM
. * Re: DU: The great laserdisc flood CiroConsentino  05/12/18 10:09 PM
. * Re: DU: The great laserdisc flood R. Belmont  05/16/18 10:44 PM
. * Re: DU: The great laserdisc flood Haze  05/16/18 11:00 PM
. * Re: DU: The great laserdisc flood Simon Inns  05/14/18 04:18 PM
. * Re: DU: The great laserdisc flood taz-nz  05/15/18 12:40 PM
. * Re: DU: The great laserdisc flood SmitdoggAdministrator  05/12/18 10:11 PM
. * Re: DU: The great laserdisc flood Shoegazr  05/13/18 01:03 AM
. * Re: DU: The great laserdisc flood JustNiz  05/13/18 03:10 AM
. * Re: DU: The great laserdisc flood Shoegazr  05/13/18 05:13 AM
. * Re: DU: The great laserdisc flood *=/STARRIDER\=*  05/13/18 03:43 AM
. * Re: DU: The great laserdisc flood MooglyGuy  05/13/18 07:08 AM
. * Re: DU: The great laserdisc flood MC68K  05/13/18 07:13 AM
. * Re: DU: The great laserdisc flood Vas Crabb  05/13/18 07:25 AM
. * Re: DU: The great laserdisc flood JustNiz  05/13/18 04:36 AM
. * Re: DU: The great laserdisc flood Vas Crabb  05/13/18 05:55 AM
. * Re: DU: The great laserdisc flood taz-nz  05/14/18 12:39 PM
. * Re: DU: The great laserdisc flood *=/STARRIDER\=*  05/13/18 04:55 AM
. * Re: DU: The great laserdisc flood JustNiz  05/13/18 05:23 AM
. * Re: DU: The great laserdisc flood *=/STARRIDER\=*  05/13/18 05:51 AM
. * Re: DU: The great laserdisc flood JustNiz  05/13/18 08:10 PM
. * Re: DU: The great laserdisc flood John Doe  05/14/18 03:31 AM
. * Re: DU: The great laserdisc flood JustNiz  05/15/18 02:46 AM
. * Re: DU: The great laserdisc flood taz-nz  05/14/18 01:14 PM
. * definitely material for MAME FAQ section imo gregf  05/14/18 04:45 AM
. * Re: Quick link to Aaron's Laserdisc explanation... Bad A Billy  05/14/18 05:28 AM
. * Re: DU: The great laserdisc flood *=/STARRIDER\=*  05/14/18 02:41 AM

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