Bizarro Resolve AAF & ALE > Avid issue w green bars & static
I'm an editing instructor here at AFI Conservatory. Avid 8.8.4, Resolve 12.5.6. Nexus client 188.8.131.52 going to an ISIS. Blackmagic Decklink Extreme 24 BOBs. Trashcan Macs running El Capitan 10.11.6 with the AMD Firepro D500 graphic card with 3072 mb memory. RAM to spare on the Macs.
Our students are linking to AMA media and transcoding to DNX 115 in Resolve, creating an AAF and ALE and moving the MXF files into the appropriate place, and bringing in the AAF and ALE to begin their cutting. We have NOT been using the "Round trip" preset although the next time this occurs that will be our first attempt. We want to make sure we solve the issue so we're not jumping the gun on switching our workflow to that right away -- unless you sages of COW have some useful thought on the matter.
6 out of 8 projects, this had gone just fine and as expected.
However, in two cases, everything appears to have gone fine; the clips are apparently online and all seems well. But load up a clip and what we get is a source window full of green bars alternating with colored static (color noise?). It's every single clip.
Restarting from a full power off of EVERYTHING (except the ISIS of course) doesn't fix the problem. Deleting the clips in Avid and re-importing doesn't fix the problem. Deleting the media files and the master clips and re-transcoding and re-AAF and ALE-ing doesn't fix the problem.
Re-doing this process on another workstation fixed the problem, but we then discovered some of the clips that HAD shown up perfectly well from the previous day's shoot were exhibiting the "green lines and noise." They had to be re-transcoded and then work fine.
The process had worked perfectly well on this workstation, and the other one exhibiting this problem, for the previous day's work.
We ended up re-transcoding the clips that had "gone bad" but I've been digging and digging and haven't seen any reference to this issue.
Avid bug? -- seems possible.
Resolve bug? -- seems less likely because it's spotty and hasn't happened before, but you never know.
Something patched in one of the above? Haven't been able to find references for this at all.
Nexus client bug? Having a hard time finding the current Nexis version, but it's possible, who knows.
Driver/RAM fail on the video cards? Maybe?
Bad RAM on the workstation? It exhibits no other issues under pressure.
I am beside myself to hear from anyone who has had this weird green/color noise thing happen. Our students here are on blistering schedules so when something like this happens they lose editing time and we don't want that to be the case; we have 21 more films coming down this pipeline in the weeks to come so we need to make sure this gets -- no pun -- resolved.
Can anyone help?