I am working in a UHD project, I have imported quick time movies with DNxHR 4:4:4 ... this is an online edit computer. Playback in timeline is stuttering and choppy at random times. There are NO blue, red or yellow lines on the timeline, nothing to indicate slow hard drives (I get over 1000MB/s on my fast RAID 5, and yes NO drive indexing on the RAID) and surely my system could not be wanting, I have dual 10 core zeons and 128GB RAM. With all this speed under the hood, stuttery playback is definitely not expected. Wondering if anyone out there can share any insight. Specifically, if there are no red or yellow lines in my timeline, then why is the playback sub-par?
And back to a windowless room full of Avids he goes.
Do you have a video I/O device? If yes, try disabling it.
Check the Avid Console during playback. It might provide more info.
Storage is connected via Thunderbolt?
DQS
www.mpenyc.com
Hi Dom. NO video IO device yet. Storage connected via Thunderbolt 2 yes. Am getting 1000MB/s read/write. Sadly, I do not have my proper monitoring in place yet, I am mid-build on this edit suite. I am only viewing via the full screen playback feature. I am starting to think that the stuttery playback is the computer monitor(s) not being able to process the signal properly (???). Either that or there is some sort of mismatch between my online graphics bit rate and the monitor's bit rate (does that even make sense?) or the Avid's bit rate which I set on import. (In other words, the online graphics were rendered at DNxHR HQX 4:4:4 ... but I am not able to import at that resolution, only have 12 bit 4:2:2 resolutions available on the import. Could that possibly cause the full screen playback and/or the composer monitor playback to be choppy???). I am installing my DNxIO soon and I will report back as to how performance increases/changes.
I am wondering if anyone knows if the ABSENCE of any lines (blue,red,or yellow) means simply that there is no playback issue at all. In other words, will the lines always be there as a warning any time there is even the slightest hiccup in the playback or the timeline?
Dreid, if your monitors are not 4K monitors, then MC has to downres the video in real time in order to play it. That could easily cause choppy playback.
Dave S.
Dreid, try to increase the video memory size in the Media cache settings.
peace luca
I just wanted to follow up on this: my Media Cache setting is at 64GB (on my 128 GB system) that wasn't the problem. Media drives getting 1000 MB/s read/write, that's not the problem. The stuttering playback was indeed caused by simply looking at 4K video on non-4K Dell computer monitors. Full screen playback is a nice feature, but of course I can have no confidence in the signal, either for resolution or color. I now have my 4K client monitor connected via HDMI 2.0 and SDI (fed by the DNxIO) and the playback is smooth in 4K. Thanks all for your good suggestions.
Thank You for telling!
You can get a smooth workflow of 4K video on Avid by using a Proxy file, for the detailed steps, please visit:
http://resources.avid.com/SupportFiles/attach/HighRes_WorkflowsGuide.pdf
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