• LaserDisc

    From Nightfox@VERT/DIGDIST to Android8675 on Wed Oct 9 16:12:44 2019
    Re: Vinyl
    By: Android8675 to Lupine Furmen on Wed Oct 09 2019 11:37 am

    Laserdiscs had 2 formats CAV (Constant Angular Velocity - Spins at one speed, hold 30 minutes per side), and CLV (Constant Linear Velocity - Spins at variable speeds (Slower on the outside) to hold an hour of video per side).

    CAV was supposed to be less compressed/sharper. I had a limited edition Blade Runner that was 6 discs, 12 sides.

    Aside from cost, I think that was another problem with the Laserdisc format: It didn't hold very much, at 1-2 hours per disc. Having to keep flipping and swapping discs to get through a movie would be a little annoying. Most DVDs and blu-ray discs can store an entire movie on one disc, unless the movie is an unusually long movie. I think Titanic spans 2 DVDs, though I think blu-ray can hold the entire movie.

    Nightfox

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  • From Android8675@VERT/SHODAN to Nightfox on Thu Oct 10 08:46:04 2019
    Re: LaserDisc
    By: Nightfox to Android8675 on Wed Oct 09 2019 04:12 pm

    CAV was supposed to be less compressed/sharper. I had a limited edition Blade Runner that was 6 discs, 12 sides.

    Aside from cost, I think that was another problem with the Laserdisc

    format:
    It didn't hold very much, at 1-2 hours per disc. Having to keep flipping and swapping discs to get through a movie would be a little annoying. Most DVDs and blu-ray discs can store an entire movie on one disc, unless the movie is an unusually long movie. I think Titanic spans 2 DVDs, though I think blu-ray can hold the entire movie.

    Well... I mean as robust and as "thick" as laserdiscs were, I imagine that if development had continued on LDs they probably would of did what DVDs did and add multi-layers which is really what saved DVDs from being limited to 1-2
    hours per side. Also compression advancements...

    DM said LDs were analog, which I find kind of interesting, and had never really though of until I saw the CED discs which do look similar to LDs. Weird
    encoding which I just naturally assumed was digital.

    At any rate, LDs needed to die, and really didn't stand a chance once the tech for CDs made the jump to DVDs (I assume that's more or less how it worked).

    Anyways...

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  • From MRO@VERT/BBSESINF to Nightfox on Fri Oct 11 21:20:13 2019
    Re: LaserDisc
    By: Nightfox to Android8675 on Wed Oct 09 2019 04:12 pm

    and blu-ray discs can store an entire movie on one disc, unless the movie is unusually long movie. I think Titanic spans 2 DVDs, though I think blu-ray hold the entire movie.


    i had titanic on one dvd. my gf at the time loved it and wanted to watch it all the time.

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  • From Android8675@VERT/ECBBS to Nightfox on Mon Mar 9 13:23:23 2020
    Re: LaserDisc
    By: Nightfox to Android8675 on Wed Oct 09 2019 16:12:44

    Laserdiscs had 2 formats CAV (Constant Angular Velocity - Spins at
    one speed, hold 30 minutes per side), and CLV (Constant Linear
    Velocity - Spins at variable speeds (Slower on the outside) to hold
    an hour of video per side).

    CAV was supposed to be less compressed/sharper. I had a limited
    edition Blade Runner that was 6 discs, 12 sides.

    Aside from cost, I think that was another problem with the Laserdisc format: It didn't hold very much, at 1-2 hours per disc. Having to keep flipping and swapping discs to get through a movie would be a little annoying. Most DVDs and blu-ray discs can store an entire movie on one disc, unless the movie is an unusually long movie. I think Titanic spans 2 DVDs, though I think blu-ray can hold the entire movie.

    Bringing up an old topic, but I'm bored. So apparently if Laserdiscs hadn't gone the way of the Doodoo, they (whoever was developing next gen LD stuff at the time) was working on a way to improve both the density of the data as well as adding layers to the discs. So given enough time Laserdiscs would of did what Bluray did for DVD. I believe that's all in theory.

    Here's another fun tidbit, laserdiscs spin fast enough that if you were to "eject/launch" a disc while spining it could (in theory) embed itself into drywall. (Dont quote me on that, I probably misheard this)

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  • From Rampage@VERT/SESTAR to Android8675 on Mon Mar 9 16:51:09 2020
    Re: LaserDisc
    By: Android8675 to Nightfox on Mon Mar 09 2020 13:23:23


    Android8675> Here's another fun tidbit, laserdiscs spin fast enough that if you
    Android8675> were to "eject/launch" a disc while spining it could (in theory)
    Android8675> embed itself into drywall. (Dont quote me on that, I probably
    Android8675> misheard this)

    you didn't hear wrong... CD/DVD can do this, too... i've done it manually throwing them just like we used to do when we practiced with shuriken... coming out of a tray, though, is a bit tricky...

    we'd get a piece of sheetrock, stick it up on a frame with a few nails, trace a silhouette of one of us on it, and then start throwing at specific target areas until the board was pretty much eaten all up... we're talking about maybe max 20 foot range... one of my best shots was a turn around shot where i stood with my back to the target, turned, and threw in one motion... deadly accurate most every time... didn't matter if it was a hand, knee, head, or heart shot... we'd spend hours doing this... it was quite fun back in the day when we weren't out riding our boards in some empty pool, running downhill races off the mountain, or playing hacky sack for hours on end :)


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  • From DaiTengu@VERT/ENSEMBLE to Android8675 on Mon Mar 9 19:40:30 2020
    Re: LaserDisc
    By: Android8675 to Nightfox on Mon Mar 09 2020 01:23 pm

    Here's another fun tidbit, laserdiscs spin fast enough that if you were to "eject/launch" a disc while spining it could (in theory) embed itself into drywall. (Dont quote me on that, I probably misheard this)

    I'm not sure how you'd transfer rotational kinetic energy to lateral kinetic energy...

    DaiTengu

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  • From Rampage@VERT/SESTAR to DaiTengu on Mon Mar 9 23:35:03 2020
    Re: LaserDisc
    By: DaiTengu to Android8675 on Mon Mar 09 2020 19:40:30


    Here's another fun tidbit, laserdiscs spin fast enough that
    if you were to "eject/launch" a disc while spining it could
    (in theory) embed itself into drywall. (Dont quote me on
    that, I probably misheard this)

    DaiTengu> I'm not sure how you'd transfer rotational kinetic
    DaiTengu> energy to lateral kinetic energy...

    the edge can catch on something in the tray and eject the disc laterally... it doesn't happen so much these days but one way it used to be possible was to use a paper clip and push the manual eject you would use if the drive had no power... especially if a disk is not fully balanced... once the door/tray open, the center hub isn't holding the disk in place and it can/could come out... i think there's a brake incorporated these days to stop the disk before the door opens...


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  • From Vk3jed@VERT/FREEWAY to DaiTengu on Tue Mar 10 22:00:00 2020
    On 03-09-20 19:40, DaiTengu wrote to Android8675 <=-

    I'm not sure how you'd transfer rotational kinetic energy to lateral kinetic energy...

    Same way jet engine turbines do it - spin it fast enough for the disc to shatter. :D

    Example: Qantas QF32 (A380) several years ago. :)

    https://en.wikipedia.org/wiki/Qantas_Flight_32

    I have read somewhere that CD/DVD discs can be spun fast enough to shatter, especially if there's a physical defect. Modern drives can use much greater rotational speeds than the original specs required.


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  • From poindexter FORTRAN@VERT/REALITY to Android8675 on Tue Mar 10 06:30:00 2020
    Android8675 wrote to Nightfox <=-

    Bringing up an old topic, but I'm bored. So apparently if Laserdiscs hadn't gone the way of the Doodoo

    It was a pretty crappy format, but I think you meant "Dodo".





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  • From Android8675@VERT/REALITY to DaiTengu on Tue Mar 10 07:07:05 2020
    Re: LaserDisc
    By: DaiTengu to Android8675 on Mon Mar 09 2020 07:40 pm

    I'm not sure how you'd transfer rotational kinetic energy to lateral kinetic energy...

    You wouldn't just being funny.
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  • From Android8675@VERT/REALITY to poindexter FORTRAN on Tue Mar 10 07:10:25 2020
    Re: Re: LaserDisc
    By: poindexter FORTRAN to Android8675 on Tue Mar 10 2020 06:30 am

    Bringing up an old topic, but I'm bored. So apparently if Laserdiscs hadn't gone the way of the Doodoo

    It was a pretty crappy format, but I think you meant "Dodo".

    Ha, though I'm pretty sure I got it right. Either way...
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  • From Dumas Walker@VERT/CAPCITY2 to POINDEXTER FORTRAN on Tue Mar 10 18:01:00 2020
    Android8675 wrote to Nightfox <=-

    Bringing up an old topic, but I'm bored. So apparently if Laserdiscs hadn't gone the way of the Doodoo

    It was a pretty crappy format, but I think you meant "Dodo".

    Or maybe he just meant if they had not got flushed down the toilet.. :)


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  • From JIMMY ANDERSON@VERT/OTHETA to ANDROID8675 on Tue Mar 10 10:02:00 2020
    ANDROID8675 wrote to NIGHTFOX <=-

    Here's another fun tidbit, laserdiscs spin fast enough that if you were
    to "eject/launch" a disc while spining it could (in theory) embed
    itself into drywall. (Dont quote me on that, I probably misheard this)

    Thought you were going to say "don't quote me on that - only happened once!"




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  • From JIMMY ANDERSON@VERT/OTHETA to VK3JED on Tue Mar 10 10:05:00 2020
    VK3JED wrote to DAITENGU <=-

    I have read somewhere that CD/DVD discs can be spun fast enough to shatter, especially if there's a physical defect. Modern drives can
    use much greater rotational speeds than the original specs required.

    I broke one once - turned a tower over on its side while the CD/DVD
    was spinning! Don't know if it was a fluke or not, but I never did
    it again!!!




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  • From MRO@VERT/BBSESINF to JIMMY ANDERSON on Thu Mar 12 22:08:44 2020
    Re: Re: LaserDisc
    By: JIMMY ANDERSON to VK3JED on Tue Mar 10 2020 10:05 am

    VK3JED wrote to DAITENGU <=-

    I have read somewhere that CD/DVD discs can be spun fast enough to shatter, especially if there's a physical defect. Modern drives can use much greater rotational speeds than the original specs required.

    I broke one once - turned a tower over on its side while the CD/DVD
    was spinning! Don't know if it was a fluke or not, but I never did
    it again!!!


    yeah i did the exact same thing. was pretty scarey

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  • From JIMMY ANDERSON@VERT/OTHETA to MRO on Sat Mar 14 09:37:00 2020
    MRO wrote to JIMMY ANDERSON <=-

    I broke one once - turned a tower over on its side while the CD/DVD
    was spinning! Don't know if it was a fluke or not, but I never did
    it again!!!

    yeah i did the exact same thing. was pretty scarey

    Yeah the sound was TERRIBLE! Like gears were stripping or something!

    LOL




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