Brian 2009-07-28 15:20:09
I recently copied some TV art teaching programs onto a DVD disc.
The total time of the 5 programs (each approx 26 minutes) was 133
I didn’t think they would fit on a single 120 minute disk as they were
recorded at SP quality. At this quality a maximum of 120 minutes per
DVD can be stored.
Much to my surprise the 5 programs were able to be copied to DVD
without any errors such as lack of space etc.
After thinking about it I found the reason was that the recording had
been made using a “variable video bit rate” and as there was very
little movement in the art programs the recording was made at a lower
bit rate. The movement would mainly be the artist hand and arm as most
of the time the canvas the artist was drawing on was shown on the
So if you have recorded programs with little movement such as a
public speaker, a lot of still subjects such as buildings and
landscapes, etc then it’s possible to fit more video on a single DVD
Biz 2009-07-28 15:20:23
4.7GB of data, is 4.7 GB of data. It doesnt give any indication of an exact
time that can be stored due to the variable bitrate nature of dvd video. It
also depends on what audio you use.
Brian 2009-07-28 15:20:36
In this case it was Mpeg sound using a DVD Recorder.
I always thought I was limited to 120 minutes when recording in SP
mode and maybe a minute or two over 120 was possible but was pleased
to find that I could record 13 minutes over the 120 minute on a DVD.
I wonder if the video had continous action causing the recorder to
record continously at a high video bit rate for 120 minutes than maybe
the recording would be too large at SP mode to fit on a DVD disc.
Stuart miller 2009-07-28 15:21:13
You wonder correctly. I have instances where I could only get 100 to 110
minutes on a dvd.