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Hi-def playback is possible at 25fps - just - if you render your footage using certain codecs.
Works on a single layer only. With a single raptor or single scsi drive
see
http://chaldee1.gotadsl.co.uk/~richa...read.php?t=183
you need to use the photojpeg codec at 50% quality...
pixlet doesnt work - its too slow.
mjpeg codec just about works too.Quote:
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.Quote:
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?Quote:
Originally Posted by litemover
And your photo jpeg files?
R
Christian- i downloaded your dvc pro movie.Quote:
Originally Posted by litemover
And its as i thought,
Someone is doing some behind the scenes fiddling.
Although you can create the movie at 1280x720 with the dvc-pro codec in After Effect ( i did mine in Compressor )
This isnt whats happening behind the scenes.
I think the decompressor is taking the movie at 720x480 and then scaling it up to 1280x720 but at playback time.
The information in the movie is only stored at 720x480.
Using Get Movie Properties in Quicktime player shows that your movie is stored at 720x480.
I have a pdf capture of the screen that shows this.
How many firmtek cards did you use?Quote:
Originally Posted by litemover
I thought they were going to do a 4 port card, but its not on their website.
You used an external self-made case?
Did you use apple's sata interface as well as the firmtek card?
www.firmtek.com
That's wierd,
I guess that explains why it was playing back so fast.
Strange, I'll have to do some more tests with this.
Christian Choi
I'm using the APPLE and 1 Firmtek but I think I would get better results with 2 firmteks and bypass the apple.Quote:
Originally Posted by samsc
2 Drives are in the internal bay, 2 are in external enclosures that I modified to be Sata to Sata (this was before they made the sata to sata cases). When I travel with it, I take all the drives out and put them in my carry on bag. I use a PCI slot with a notch just big enough to allow the cables to go through so I don't disturb the airflow within the G5. ITS VERY IMPORTANT TO KEEP YOUR G5 AIRTIGHT. Do not remove the pci slots and allow the cables to dangle or your machine will overheat, especially pushing highdef for long periods of time.
Now that the maxisata internal option is out from Promaxx, I'm going to up to 6 drives, 2 in the apple area, 3 in the maxisata, and 1 in the superdrive area. Take the superdrive out and make it external firewire 800. I think I'm going to try out RAID 5 this time (if it will work) and see what it gives me.
I will put one Firmtek in slot 4 and one in slot 2 then my decklink in slot 3.
Hopefully I will get the time soon.
The firmtek 4 port PCIX 133 version is awaiting fcc emmision tests, they have one, they just haven't released it.
Christian Choi
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.Quote:
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
try encoding with photojpeg.Quote:
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.
there is nothing you can do except try photojpeg.Quote:
Originally Posted by litemover
also syncing up with variable data rates is next to impossible.
you were brave to try.
i wish i could help - but the only thing that will help me is faster macs.
DVC Pro 50 is good though.Quote:
Originally Posted by litemover
Twice the data rate - for those who complain about dv, and only just slower.
You can get 3 layers on a PAL system at 25fps, and 2 on at NTSC system at 30HZ.
In my testing it took around 11milliseconds to decode the DVCPRO 50 frames.
Thanks You.Quote:
Originally Posted by samsc
CC
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.Quote:
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
Streatching it out to 720 doesn't look too bad either.Quote:
Originally Posted by samsc
Christian
Photojpeg is slower than dv codecs at the same resolution and compression rate - by about twice-Quote:
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. )
-
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
-
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!
-
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.
Looks like I need to rerender and/or recapture and re-edit all my 720p content. Pixlet looks grainy to me so it will probably remain grainy even if I run it though cleaner. damn!Quote:
Originally Posted by samsc
That bytes.
CC
Im going to try and do some testing in 5% increments from photo-jpeg 50% to 100% to see how the decode time changes.Quote:
Originally Posted by litemover
You will have to do your own testing to determine the subjective factors.
Whether something looks more or less 'grainy' - is a subjective problem.
You will have to determine the point at which something is or is not acceptable for the usage you intend.
My testing of conversion tools seems to indicate that Compressor is a more reliable to way convert between codecs than Cleaner.
Cleaner seems to fuck with things more.
I saw no colour differences between any of the images when i rendered with 68 codec types using Compressor.
The thing is christian --- you might not see any visible difference if you stretch 720x480 up to 720p.Quote:
Originally Posted by litemover
You should test this too.
There are quite a few mirages hidden away in all this stuff.
And the closer you look the more problematic it looks.
Same with all types of film-making.
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I've found that converting HDV to Photojpeg 68 with compressor works best. Runs at full speed 2 layers, 3 layers drops down to 18-24, 4 layers drops down to 24-16, 24-16, 24-16 then 7 weird that the last layer runs really slow compared to the others.
Anyways, has worked for years like this. My Hi Def HDV Cam was a good invstment, got a lot of great footage from it.
Christian