Why do I get this jerky playback?
Long time reader, first time poster, I'll do it is short and sweet. Here are my specs:
27 "IMac
Intel Core i7 3.4 GHz
24 GB 1600 MHz DDR3
NVIDIA GeForce GTX 680MX 2048 MB
SSD 1 TB internal drive of Fusion
I work in a fairly large (images of 1 TB) 4 k mixed with 2 k project. It is a 3 simultaneous shoot camera, so I need multi-cam. I have two that WD Caviar Black 7200 RPM external drives. I also have a Lacie 1 TB disk Thunderbolt.
Because the end result will be 1080 but maybe 2 k in the future, I decided to import all the RED images in native mode (as opposed to the transcoding to prores 1080 format). All my clips are 1920 x 1080, with multi-cam nesting in 1080 as well. RAM is assigned to first, other 4 GB 20 GB.
No matter what I tried, I still get jerky in the project... reading especially with multi-cam enabled, even in the setting of my resolution of 1/4. What I tried:
All media on the drive WD 01... Project, Cache, Preview, Scatch disk WD 02... Internal SSD for the OS and applications: Terrible performance
All media divided into WD 01 and 02 WD... Cache, the OS and applications on the internal SSD flash drive... project, preview, scratch on WD 01. I also tried the same thing but with the draft, preview and scratches on my Lacie 1 TB Thunderbolt and internal SSD: a little better than all media 01-disk.
At this point, I feel like I tried every variation from will the MEDIA, Cache, project files and Scratch/preview but nothing seems to give me a fluid reading constantly. I'm going to brief periods where it is very smooth, but choppy and then shortly after. I would understand if I try to edit in 2 k or 4 k, but all my calendars and the nests are 1080. Even if I have pre-made sequence, it barely helps. Is it possible that I need more RAM, a better card GFX, better external hard drives? Help?
First EDIT: Updated to the latest version of 2014. No major applications running outside the first. All my drives have at least or near 50% space available.
Recommend that take a look for implementing disk layout & such on the Page of the Tweaker...
Page of Tweaker...
http://ppbm7.com/index.php/tweakers-page
Basically, they recommend only the file on the system/OS disk... and then put things on other readers by the needs of the 'good'... some must quickly connects, an only couple of fast connections for most.
Images is essentially a one-way operation unalterable and export out is essentially a read operation, so those can be necessary on somewhat slower connections as long as they are not on the SAME drive on a slow connection. Such as tell the PNY 128 GB high speed USB3 flash-drives to an external port USG3.0 on your computer. I adapted it from the other users, and this works well enough for my 1080 p images. I export to one of the several disks, that i've got in external boxes connected by USB. It is sufficient, but not flamboyant.
Everything else... files, database, previews, cache... There is a TON of work in reading/writing courses constantly while playing with these project. Drives up to 7200 rpm or faster 'standards' or SSD, connected internally through SATA-II or better, or external via eSATA II and Thunderbolt connections are necessary. Close read/write speeds supported appropriate for work in the massive tests they did what above, none of the available Firewire or USB2/3 connections mentioned site. The speeds of "burst" claimed by the manufacturers are performed on absolute most ideal landscaping with UMM... size right? ... of data packets to get the best numbers. They are not the usable numbers for requests to read/write strong and constant as the Adobe DVA through the machine.
Don't forget... during playback... PrPro "reads" the source footage including when to jump in & on each clip, throw in all your instructions for Assembly, color changes, transistions, effects, EVERYTHING... and on-the-fly built the image you see on the playback screen. It does not have something so he can just 'read' the disc, does it on the fly. Even when you glimpses of a section of a timeline, any change you do... these glimpses are exceeded.
That's why we all need machines that both have a material quite solid on the mobo, AND a lot of high speed drive connections. Best is tell a table of 4/5 disc drives of 2 TB in RAID 0 or 5 for the cache of d-base, files, projects, & previews... and who may even have media (original film) on it.
Neil
Tags: Premiere
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