On Sat, 20 Sep 2003, Bernhard Praschinger wrote:
> That might be not really true. The datarate you have to expcet is
> described in exactly in the mjpeg howto section:Unsorted list of useful
It sure looks like the data rate for MJPEG is much higher than
DV (DV is fixed at ~25megabits/sec or about 3.5MB/s). It is
much easier/simpler to predict the amount of space needed for
DV since the rate is fixed at ~12GB/hour
> Hints
>
> Audio: ( Samplerate * Channels * Bitsize ) / (8 * 1024)
> Video: (width * height * framerate * quality ) / (200 * 1024)
>
> You have to add both values together. To get the datarate in kb/sec.
The Video formula is not giving me answers that look right.
For 640x480 and 29.97 frames/sec I get:
(640 * 480 * 29.97 * 1.0 ) / (200 * 1024) = 50.57
50 kb/sec? Wow -that's amazing compression ;)
For audio it works out better. The DC10 produces PCM audio? Is
it at 44100 or 48000 for the sample rate? Or is it selectable?
48000 * 2 * 2 / (8*1024) = 187.50 (~1536000 bits/sec) which
is the correct number.
If the video formula is from the howto section then there's a
typo or something that is producing very low numbers.
Cheers,
Steven Schultz
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