Windows Explorer ~ 20 % but Dopus uses 100 %
100% of what, measured where, while doing what?
Lowering Preferences / File Display Modes / Thumbnails: Thumbnail threads may reduce the disk usage while generating thumbnails, if that's what you mean, and you'd prefer the operation was CPU-bound rather than disk-bound. Full resource utilisation isn't always a bad thing, though (if something is only using 20% of the resource, it may be under-utilising it and running slower than it could).
Opus has to read files to generate thumbnails for them. That means using the disk.
High disk usage isn't automatically a bad thing if there is a reason for it.
If both disk and CPU were not close to 100% while generating thumbnails then it would mean thumbnail generation was taking much longer than it has to by not using all the available resources to get as much done at once.
You can reduce the number of thumbnail threads (see my reply above) if you'd like Opus to generate fewer thumbnails in parallel. Sometimes that can be faster, for example if so many things are being read at once that the filesystem is "thrashing" as it tries to service the requests. But it may also make things slower.
I usually set the number of threads to be the number of logical CPU cores, minus one or two (leaving some CPU free to handle other work and keep everything else responsive, but not much since Windows can usually share things out as needed).
Thank you for your detailed explanation.
But others file manages and windows explorer don't have so much disk usage.
I turned it off.
Do they generate as many thumbnails as quickly? Disk usage is only part of the picture. High disk usage may be good or bad.
ok ,look vid.me/wUKk
windows explorer vid.me/8u6t
Explorer looks like it is using cached versions of the video thumbnails, while Opus seems to be generating them.
Is thumbnail caching turned on within Opus? (Preferences / File Display Modes / Thumbnails)
You may also want to try going to Preferences / Viewer / Viewer Plugins, then configuring the Movie plugin and turning off its Generate Thumbnails option. Opus will then fall back on the Windows shell for video thumbnails, which can be better (or worse) depending on the codecs/splitters involved.
[quote="leo"]
You may also want to try going to Preferences / Viewer / Viewer Plugins, then configuring the Movie plugin and turning off its Generate Thumbnails option. [/quote]
thank you , now it's fine