- Material: DV does not require the same bandwidth as AVCHD or RED 4K.
- Number of tracks: a single track does not require as much bandwidth as 10 tracks.
- Nature and amount of effects/transitions, native or third-party.
- Amount of memory installed and pagefile size and location.
- Graphics card used.
- CPU used.
- Clock speed.
- Disk I/O setup.
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.
with CS6 and a single track of AVCHD, I saw transfer rates of around 50 MB/s,
That's a confirmed bug in CS6. Adobe is working on a fix. AVCHD is nominally around 5 Mb/s, not 50.
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.
Yeah, you're right. 6.01 did drop the rate down to mid 30's or so.
But in CS5, it plays at the expected 5 MB/s, so something is still not quite right about CS6.
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