Trying to build a raid array to edit with and want to know how much speed i need for caching read/write drive for premiere and After Effects. I'm of the impression that the cache doesn't need more than a single 7200rpm drive (~120MB/s) but really i have no clue what the data rate that adobe caches to is or what the data rate to read is
so it's 2 questions
how fast does premiere write the cache? (i know this is system dependent but a ballpark figure would be good for say a sandy bridge i5 2500k system with a 2 raid 7200rpm drive)
what's the data rate to read the cache in a 1080 24p file?
also, when doing the final export does premiere/after effects read from the Cache or the original files or both?
So the question is a bit broader than you may have surmised.
a sandy bridge i5 2500k system with a 2 raid 7200rpm drive
That is pretty minimal for a setup.
ok i've figured out the physics of this question.
The Cache Read data rate is always larger than the Cache Write data rate, because the computer would have to be rendering to Cache faster than realtime for the Write rate to be higher, which would make it unnecessary to render to cache in the 1st place. So I'm really only worried about the Cache read data rate. Does adobe have a paper that tells us what the data rate is for different sequences.
my 3 common workflows are
canon h.264 1080 24p
AVChd 1080 24p from my GH2 with a 44mb
r3d 5k epic footage 24p - (this is painful to edit )
anyone know where this info is?
I don't know if there exists such a paper, but with CS6 and a single track of AVCHD, I saw transfer rates of around 50 MB/s, with six video tracks and an adjustment layer with a combination of AVCHD, XDCAM EX, HDV, DV, Canon MXF and RED 4K is had transfer rates in excess of 300 MB/s.
You better have a look at Adobe Forums: System requirements for CS5 and realize that your workflow falls solidly in the Difficult category. An i5-2500 and a 2 disk raid0 will be borderline and you should expect choppy and jerky behavior.
CS6.01 is a little better, but far from your nominal 5 MB/s. If this is a confirmed bug, then it not only applies to AVCHD, but to other formats as well.
Playback of a single video track, no effects, no transitions, just clips butted together in CS6.01 gives average transfer rates of:
AVCHD around 32 MB/s
Canon MXF around 62 MB/s
Notice that the nominal rate of MXF is 50 Mbps or 6.25 MB/s and for AVCHD it is 24 Mbps or 3 MB/s. But those nominal rates only apply to the recording rates, not the unpacked material used for display.
not the unpacked material used for display.
Decoding happens at the CPU, after it's read from the disk. The disk read rate for DV, HDV and AVCHD, including audio and overhead, will be around 5 MB/s.
Harm and Jim, here is a picture of my disk utilization with a single AVCHD track before the 6.0.1 upgrade. The top track is if I just play the track (notice the scale, it is about 3 MB per second as you said). The bottom track is after just a little scrubbing and you can see it is more like 150 MB/second and is not continuous. I did the 6.0.1 upgrade and it is now somewhat better, I have not checked the disk utilization yet.
Message was edited by: Bill Gehrke
Europe, Middle East and Africa