#Frame Rate
6 messages in this thread
Hi Brad!
I think you are approaching the problem correctly, ie. reducing the
quality of the video to get it to play at a decent speed off the double
speed CD-ROM. I think a double speed CD-ROM can sustain about 300kb/sec
transfer rates. Most .avi players I have seen have some sort of option
that describes the .avi file and the kb/sec that it needs to play at.
The MPEG boards would help, and as the standard advances will probably
become more and more common. However, for mass distribution right now,
you are probably better off in the .avi format.
The FAST Video Machine is more of a video editor, than a multi-media
creator. They do have a product the Movie Machine that can create and
playback .avi files using M-JPEG compression.
-John
John,
I would be wary of saying 2X CD-ROM drives can sustain 300kbs, which is
generally considerd peak performance. One rule of thumb says 60kbs off peak is
sustained, which seems to hold true for movies played on high-end Macs. When
setting data rates for movies which you don't want to drop frames under
Windows, between 150 and 200 kbs seems common for AVI, somewhere around 120 for
QuickTime for Windows clips.
Nels Johnson
Nels,
OK. I bow to practical experience, my 300KB/s came from product
literature. 🙂
-John
yes, they seem to vary all over the place. I brought the CD home to one of our
PCs and the result is very jery. It might be a single speed drive but I could
swear it was a doubel. Have to tear that baby apart and see. There is a product
mentioned here on the board that scrubs frames on the Indeo AVIs and there
example says it reduced the avi by 70K but not what percentage that was.
>Most .avi players I have seen have some sort of option
>that describes the .avi file and the kb/sec that it needs to play at.
Yup, we stumbled across this and improved our results tremendously.
>They do have a product the Movie Machine that can create and
>playback .avi files using M-JPEG compression.
Yes, what does the end user I am sending it to need. Can they get by without an
MPEG board? Can they run 320by240 clips off a 300kb CDROM? Right now we are
using 160 by 120 and that is REEEEL small.
Anybody who has done this with the FAST Movie Machine I would love to hear
from. Anybody who has done it with INDEO I would also like to hear from. Also
does anyone have experience with the new Creative Labs video board? Or the new
Intel Board? Particularly with going to CD-ROM, either CD-R or mass production.
Brad,
End users without a hardware based decoder are going to have to rely on
software based decoding schemes, read slow. I think that in the future
more and more video/multimedia cards are going to start to include MPEG
decoder circuitry, however.
-John