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Thread: What Is Dvd?

  1. #1
    Retired Staff www.desirulez.net
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    Smile What Is Dvd?

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    DVD stands for Digital Versatile/Video Disc, DVDR stands for DVD Recordable and DVDRW for DVD ReWriteable. If you're familiar with regular audio/music CDs or regular DVD-Video discs, then you will know what a recordable DVD looks like. A recordable DVD stores up to 2 hours of very good quality DVD-Video, including several audio tracks in formats like stereo, Dolby Digital or DTS and also advanced menu systems, subtitles and still pictures that can be played by many standalone DVD Players and most computer DVD-ROMs. If you choose to lower the video quality it is possible to store several hours video on a recordable DVD using low bitrates and low resolution with video quality more like VHS, SVHS, SVCD, CVD or VCD. It is also possible to have up to 4.37* GB ordinary data or mix DVD-Video and data on a recordable DVD that can be played by most computer DVD-ROMs.

    There are three competing DVD Recording standards, DVD-R/DVD-RW and DVD+R/DVD+RW have pretty similiar features and are compatible with many standalone DVD Players and most DVD-ROMs while DVD-RAM has less DVD Player and DVD-ROM compatibility but better recording features.

    DVD-R and DVD-RW
    DVD-R was the first DVD recording format released that was compatible with standalone DVD Players.
    DVD-R is a non-rewriteable format and it is compatible with about 93% of all DVD Players and most DVD-ROMs.
    DVD-RW is a rewriteable format and it is compatible with about 80% of all DVD Players and most DVD-ROMs.
    DVD-R and DVD-RW supports single side 4.37 computer GB* DVDs(called DVD-5) and double sided 8.75 computer GB* DVDs(called DVD-10).

    DVD+R and DVD+RW
    DVD+R is a non-rewritable format and it is compatible with about 89% of all DVD Players and most DVD-ROMs.
    DVD+RW is a rewritable format and is compatible with about 79% of all DVD Players and most DVD-ROMs.
    DVD+R and DVD+RW supports single side 4.37 computer GB* DVDs(called DVD-5) and double side 8.75 computer GB* DVDs(called DVD-10).

    DVD+R DL
    DVD+R DL or called DVD+R9 is a Dual Layer writeable DVD+R. The dual layered discs can hold 7.95 computer GB* (called DVD-9) and dual layered double sides 15.9* computer GB (called dvd-18).

    DVD-R DL
    DVD-R DL or called DVD-R9 is a Dual Layer writeable DVD-R. The dual layered discs can hold 7.95 computer GB* (called DVD-9) and dual layered double sides 15.9* computer GB (called dvd-18).

    DVD-RAM
    DVD-RAM has the best recording features but it is not compatible with most DVD-ROM drives and DVD-Video players. Think more of it as a removable hard disk. DVD-RAM is usually used in some DVD Recorders.

    DVD SIZES
    The DVD sizes can be a bit confusing. There are basicly 4 different DVD Sizes,

    DVD-5, holds around 4 700 000 000 bytes and that is 4.37 computer GB where 1 kbyte is 1024 bytes* . DVD+R/DVD+RW and DVD-R/DVD-RW supports this format. Also called Single Sided Single Layered. This is the most common DVD Media, often called 4.7 GB Media.

    DVD-10, holds around 9 400 000 000 bytes and that is 8.75 computer GB. DVD+R/DVD+RW and DVD-R/DVD-RW supports this format. Also called Double Sided Single Layered.

    DVD-9, holds around 8 540 000 000 bytes and that is 7.95 computer GB. DVD+R supports this format. Also called Single Sided Dual Layered. This media is called DVD-R9, DVD-R DL, DVD+R9, DVD+R DL or 8.5 GB Media.

    DVD-18, holds around 17 080 000 000 bytes and that is 15.9 computer GB. DVD+R supports this format. Also called Double Sided Dual Layered.

    * In the computer world is 1 KB data = 1024 bytes so 4 700 000 000 bytes / 1024 = 4 589 843KB / 1024 = 4482MB / 1024 = 4.37GB.


    DVD+R/DVD+RW/DVD+R DL and DVD-R/DVD-RW exact sizes
    DVD-R/DVD-RW = 4 706 074 624 bytes ( 4488 MB )
    DVD+R/DVD+RW = 4 700 372 992 bytes ( 4482 MB )
    DVD+R DL = 8 547 993 600 bytes ( 8152 MB )


    DVD Write and read speeds Single Layer(4.7GB) write speeds
    1x (CLV) = about 58 minutes
    2x (CLV) = about 29 minutes
    2.4x (CLV) = about 24 minutes
    4x (CLV) = about 14.5 minutes
    6x (CLV/ZCLV) = about 10-12 minutes
    8x (PCAV/ZCLV) = about 8-10 minutes
    12x (PCAV/ZCLV) = about 6.5-7.5 minutes
    16x (CAV/ZCLV) = about 6-7 minutes

    Dual/Double Layer(8.5GB) write speeds
    1x CLV = about 105 minutes
    2.4x CLV = about 44 minutes
    4x CLV = about 27 minutes

    Single Layer (4.7GB) read speeds
    1x read speed is 1.321MB/s = ~56 minutes
    6x CAV (avg. ~4x) read speed is max 7.93MB/s = ~14 minutes
    8x CAV (avg. ~6x) read speed is max 10.57MB/s = ~10 minutes
    12x CAV (avg. ~8x) read speed is max 15.85MB/s = ~7 minutes
    16x CAV (avg. ~12x) read speed is max 21.13MB/s = ~5 minutes

    * write speed time and read speed time is not the same because writing requires some extra steps and also does the faster writing above 6x usually use lower write speeds for some parts of the dvd. 4x DVD speed = 36x CD speed.


    Other non-standard special DVD formats:
    DVD-VCD
    is basicly a VCD authored on a DVD. DVD supports the VCD resolution but the audio has to be resampled to 48 khz. If the audio is resampled to 48 khz it is standard DVD-Video.
    DVD-SVCD
    is basicly a SVCD authored on a DVD. DVD do not supports the SVCD resolution but it may anyway work and the audio has to be resampled to 48 khz like the DVD-VCD.
    DVD-MP3
    is MP3s burned on a DVD but very few MP3 capable standalone DVD Players supports it because most Players verify DVD as DVD-Video only.

    DVD-ISO
    is MPEG ,MPG, VOB files burned on a DVD without any DVD Authoring(making the vob,ifo files) but very few standalone DVD Players supports it because most Players verify DVD as DVD-Video only.


    Technical Info for DVD-Video
    PAL

    Video:
    Up to 9.8 Mbps* (9800 kbps*) MPEG2 video
    Up to 1.856 Mbps (1856 kbps) MPEG1 video
    720 x 576 pixels MPEG2 (Called Full-D1)
    704 x 576 pixels MPEG2
    352 x 576 pixels MPEG2 (Called Half-D1, same as the CVD Standard)
    352 x 288 pixels MPEG2
    352 x 288 pixels MPEG1 (Same as the VCD Standard)
    25 fps*
    16:9 Anamorphic (only supported by 720x576)

    Audio:
    48000 Hz
    32 - 1536 kbps
    Up to 8 audio tracks containing Dolby Digital, DTS, PCM(uncompressed audio), MPEG-1 Layer2. One audio track must have MPEG-1, DD or PCM Audio.

    Extras:
    Motion menus, still pictures, up to 32 selectable subtitles, seamless branching for multiple storylines, 9 camera angles. And also additional DVD-ROM / data files that only can be read by computer DVD drives.

    Total:
    Total bitrate including video, audio and subs can be max 10.08 Mbps (10080 kbps)


    * Mbps = million bits per second
    * kbps = thousand bits per second
    * fps = frames per second



    NTSC (NTSC Film)

    Video:
    Up to 9.8 Mbps* (9800 kbps*) MPEG2 video
    Up to 1.856 Mbps (1856 kbps) MPEG1 video
    720 x 480 pixels MPEG2 (Called Full-D1)
    704 x 480 pixels MPEG2
    352 x 480 pixels MPEG2 (Called Half-D1, same as the CVD Standard)
    352 x 240 pixels MPEG2
    352 x 240 pixels MPEG1 (Same as the VCD Standard)
    29,97 fps*
    23,976 fps with 3:2 pulldown = 29,97 playback fps (NTSC Film, this is only supported by MPEG2 video)
    16:9 Anamorphic (only supported by 720x480)


    Audio:
    48000 Hz
    32 - 1536 kbps
    Up to 8 audio tracks containing DD (Dolby Digital/AC3), DTS, PCM(uncompressed audio), MPEG-1 Layer2. One audio track must have DD or PCM Audio.

    Extras:
    Motion menus, still pictures, up to 32 selectable subtitles, seamless branching for multiple storylines, 9 camera angles. And also additional DVD-ROM / data files that only can be read by computer DVD drives.

    Total:
    Total bitrate including video, audio and subs can be max 10.08 Mbps (10080 kbps)


    * Mbps = million bits per second
    * kbps = thousand bits per second
    * fps = frames per second

  2. #2
    Kal Ho Na Ho www.desirulez.net
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    Thank you so much for this post .


 

 

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