mjpeg codec just about works too.Originally Posted by samsc
mjpeg codec just about works too.Originally Posted by samsc
Can get full speed with 4 drive raptor array using a variety of codecs, Pixlet at 86, DVCPRO50 comps in AE at 1280x720 best quality, even photo Jpeg.
4 drives make a huge difference.
CC
yes. 4 drives makes a difference - what it does it push the data rate bottleneck down - until it reaches the processor bottleneck.Originally Posted by litemover
The point these converge is dependant on the codec /data rate relationship.
But it isnt going to give you more layers.
Because the drive latency stays the same - if it doesnt actually get worse.
A single drive can give better multiple file playback than multiple drives, if the data rate is below a certain threshold
The thing now preventing more layers is processor. - i think.
I got some more drives yesterday.
what data rate did you see on your pixlet 86 movie?Originally Posted by litemover
And your photo jpeg files?
R
Variable, I have many of them now, they range from 2.6 to 6meg/sec. Most of the ones that I have xtracted with the Heuris extractor from my JVC jyhd10u and encoded with quicktime using pixlet 86 range from 5.5 to 6, some of the HD artbeats clips that I have that were encoded with cleaner are much less 2meg to 3meg. For some strange reason, I cannot use cleaner to convert the MPG movies that Heuris extracts from the M2 files in the camera, all for HD but the results are like watching an I-max Movie when spread across 3 large screens and xy'ed to look as one seemless image.Originally Posted by samsc
Some play full speed all the time some fluctuate between full speed down to 28 to 21 to 18 to 31. The Data rates are variable, should I clean them to be non variable?
Here is an image of 1 movie from my JVC HD cam spread across 3 screens to give the illusion of 1 screen
Christian
nice image christian
Thanks You.Originally Posted by samsc
CC
try encoding with photojpeg.Originally Posted by litemover
its at least twice as fast as pixlet to decode.
and i cant spot the difference.
you will need to try encoding settings between 50% and 75%.
you will get more stable playback speeds- i think.
the stability of the playback speed with these codecs is well away from something i can control. its buried deep in quicktime.
I would have though DANNY has told me not to and that photojpeg is not optimized for dual proccessors. He tols me that it would be slower. I'm going to start using photo Jpeg now, it looks alot nicer and I can work with it in RT while editing.Originally Posted by samsc
How bout the blackmagic codec Richard? I'd love to start using that codec as it is extremely fast to encode and great looking?
Best,
Christian Choi
Photojpeg is slower than dv codecs at the same resolution and compression rate - by about twice-Originally Posted by litemover
DV doesnt work at any other resolution than 720x576 or 720x480. So you cannot use dv at 720p or 1080p.
You need to compare codecs that will do this....
this doesnt matter nearly so much when you are only playing one or 2 layers.
( you cannot playback 4 layers of photojpeg content. - it simply takes too long to decompress the frames.
If you need 4 layers to playback at 25/30fps you have NO choice but to use DV-NTSC (30fps) - there are no other options. Nothing else works. )
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but at 1080p resolution photojpeg is 2 1/2 times faster than pixlet.
It takes 20milliseconds to decode one photojpeg 50% frame at 1080p res - 50ms for Pixlet 50%.
And at 720p resolution is takes 10ms for a photojpeg frame at 50%, and 20ms for a pixlet frame.
This chart shows single layer decompress times;
http://chaldee1.gotadsl.co.uk/~richa...ttachmentid=22
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Blackmagic is just an uncompressed codec (YUV encoded ), nothing special- means huge files. And doing any kind of uncompressed work is really not noticeable in this environment- and its 60GB/hr - so you dont get much .
So this is the file to use if you have an 8 disc scsi array and need to do 1080p uncompressed. Data rate ~100-150MB/s!
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Whether or not photojpeg is optimised for multiprocessors- is speculation from me based on reading between the lines of quicktime developer's documentation.
In this documentation - they talk about specific changes to the DV codec to optimise it for dual processors- they dont talk about other codecs like this.
DV -is the core codec for final cut and editing.
So it would make sense to use development resources to make this work as well as possible.
This document is "Whats new in QT 6.5". I dont think this information is in here - i think its in an earlier revision:
http://developer.apple.com/documenta...6_5/index.html
This is the form of the smoke signals one receives from apple.