Hi,
[email protected] schrieb:
On Sun, 22 Feb 2009, John Detwiler wrote:
3. Standard DVD+R have 4.7 GB capacity, and hold about half an hour of
mpg's. My finished project (including 'feature' and 'extras') will be
at least 60-90 minutes altogether.
DVD+R discs don't hold "half an hour" of MPEG video. They hold 4.7G, and
how much time that is depends entirely on the bit rate. There isn't one
standard bit rate that everybody uses. In order to fill a DVD in half an
hour you must be using a bit rate of about 20Mbps, which is almost
certainly *much* too high. Many decoders won't even operate properly when
fed such a high-rate stream; I think the spec sets a maximum of about
10Mbps.
From http://en.wikipedia.org/wiki/DVD-Video:
--
DVD-Video discs have a raw bitrate of 11.08 Mbit/s, with a 1.0 Mbit/s overhead,
leaving a payload bitrate of 10.08 Mbit/s. Of this, up to 3.36 megabits can be
used for subtitles and a maximum of 9.80 megabits can be split amongst audio and
video. In the case of multiple angles the data is stored interleaved, and so
there's a bitrate penalty leading to a max bitrate of 8Mbit/s per angle to
compensate for additional seek time. This limit is not cumulative, so each
additional angle can still have up to 8Mbit/s of bitrate available.
--
In addition to the decoder, the drive itself will impose an upper limit for
the bitrate. If your DVD player handles 20 Mbit/s, you are lucky. If not, you
have no reason to complain.
Burkhard
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