DVD Capacity based on bitrate

[jfebus]

Hi all,

It is save to use the following table as the capacity os a DVD?

30 minutes @ 18,000 kbits/sec
60 minutes @ 9,000 kbits/sec
90 minutes @ 6,000 kbits/sec
120 minutes @ 4,000 kbits/sec

Please correct me if I am wrong..

Jose

[musher70]

DONT FORGET THE AUDIO..

[miketree]

18,00kb/s ? Is that posible?

[jfebus]

18,00kb/s ? Is that posible?

I don't think it's posible...just enter it in the table as a comparation...

Regards,

Jose

[q1aqza]

I think those are definitely safe. I don't have my DVD calc with me at work but I'll check when I get home, but I'm sure you can get about 2 hours at around 5000 including audio (with 384 audio that is still around 4600 for video) and that calculation is based on a safe zone that my own self-written DVD calc which gives a margin of approx 150MB for DVD menus and any slight over-average encode.

I'll check tonight and let you know.

[Baldrick]

www.vcdhelp.com/calc

90 min with 224 kbits mpeg/ac3 audio = around 6500 kbit/s
120 min with 224 kbits mpeg/ac3 audio = around 4800 kbit/s

90 min with 1536 kbits pcm/wav audio = around 5200 kbit/s
120 min with 1536 kbits pcm/wav audio = around 3500 kbit/s

it calculates with around 25 MB extra space by default(very basic menu and no motion menus, you can increase it if you are thinking of having a very complex menu with motion menus).

[Xesdeeni]

Here's a chart for reference.



Xesdeeni

(The image seems to come and go, even in 4 different browsers. If it doesn't show up, try http://www.geocities.com/xesdeeni2001)

[musicman]

Just for the record:

18,000kbs or 18(Mb)mega-bit is possible. The MPEG spec I believe can do 50 mb/s or better where HDTV is concerned.

The CBS network broadcasts all their signals now to their affiliates at 25,000 kbits or 25Mb, and most commercial advertising distrubution services such as VivX now run all their MPG2s at 25Mb/s.



Musicman

[kitty]

I seem to recall the DVD spec calls for DVD video to max out between 9000 & 10000 kbs (I don't have the number handy). My Philips 711 does not like video around the 9000 mark as it will start to skip. 8000ish is fine.

Yes commercial sat broadcasts can be almost anything as those birds have the capacity but that doesn't have anything to do with DVDs other than it is video & DVDs have video on them for the most part.

[paintmodel]

As a tip for copying DVD's. Have a look at the bitrates that are being output by your stand alone unit. You can use that as a guide to how your copy's bitrate to quality ratio should work out. My Sony standalone has a bitrate readout that I check before copying any disk. It will give you an idea what the max rates you will want to use for a 2 pass VBR conversion. I find that the two pass method with an average bitrate of about 4800 kbs will give two hours of time with near commercial quality on a 4.7 g disk.

Using TMPGenc Plus I set my 2pass VBR rate at 8000 max, 0 min, with and average of about 4800 +or- to fit into about 4.3 g of space.

[Xesdeeni]

According to the DVD FAQ (http://www.dvddemystified.com/dvdfaq.html#3.4): "Maximum video bit rate is 9.8 Mbps...," which is why the chart above stops at 9.8Mbps. I opted to stop at the low end at the VCD bit rate of 1.2Mbps.

Xesdeeni

[yg1968]

18,000kbs or 18(Mb)mega-bit is possible. The MPEG spec I believe can do 50 mb/s or better where HDTV is concerned.

It is probably possible to surpass the 9.8 mps threshold but almost all DVD players will choke above this threshold. However, your computer should be able to play it without problems. By comparaision DV is 25 mps and computers are able to play DV files.