Want 100 Thumbnails...?

jmc

Active member
Ok, I imagine this will only come in MUCH more expensive software...

There was 20 or so inserted 3-10 seconds segments of some person's idea of artistic effort.
They spent a good bit of time putting it in and I spent a good bit of time ripping it out.

Finding all the segments was a lot of work so I set the Thumbnails to 2 seconds and then could see several of them at a time.
Which was great but when I went to select the start and end frames...

Change 1 frame and the Thumbnails would take 6 seconds to adjust to that "1 frame" change.
So that was unusable.

I finally used the 2 second setting to "mark" the problem areas ("A") and then jumped to each mark and switched to single frame for editing.

That did work. But was really surprised at the 6 seconds it took for the 35? (2sec.)Thumbnails to adjust to any change. That's why I want 100 single frame Thumbnails.

Thanks,
jmc
 
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Fentropic

Member
The thumbnail view and navigation of seems to be an issue. It has been getting progressively worse with each release. Switching between time frames as you say takes a lot of time to repaint them.
Lately when opening a file and positioning to an I/IDR frame and advancing a single frame it jumps to the next I/IDR frame, so I have to instead go back a frame, then forward a frame.
I almost always set thumbnail view to single frame for accurate cuts, unless there's an issue with audio dropouts (mainly with cable recordings) and I'll switch to display up to two seconds/thumbnail to get an overview and see where the audio drops out after consulting the log to get a time estimate.
Guess it must be resource intensive and they're tring to make it less so?
 

Dan203

Senior Developer
Staff member
When thumbnails are set to any duration other than frame they are tricky. What we have to do is seek to that point, jump back to the nearest I/IDR frame, decode every frame up to the proper one, capture, display and then repeat 34 more times to fill out the other frames. As you can imagine that process isn’t quick. Especially with high resolution video that is compressed to have few I/IDR frames. With single frame we decode, capture and display in order so the seeking and finding the I/IDR only happens once. We even keep a buffer of frames that were decoded before and after the current frames just to make it a little faster To move around a little bit. Unfortunately that's just not possible with the longer increments because there are too many frames being decoded and it would require massive amounts of memory.

I know some other editors just decode the entire file in the background to an uncompressed video file on disc. This allows faster seeking, easy to display thumbnails, and real time previews of transitions and other effects. However that technique takes up a LOT of extra disk space and we've always resisted doing it for that reason.
 

jmc

Active member
When thumbnails are set to any duration other than frame they are tricky. What we have to do is seek to that point, jump back to the nearest I/IDR frame, decode every frame up to the proper one, capture, display and then repeat 34 more times to fill out the other frames. As you can imagine that process isn’t quick. Especially with high resolution video that is compressed to have few I/IDR frames. With single frame we decode, capture and display in order so the seeking and finding the I/IDR only happens once. We even keep a buffer of frames that were decoded before and after the current frames just to make it a little faster To move around a little bit. Unfortunately that's just not possible with the longer increments because there are too many frames being decoded and it would require massive amounts of memory.

I know some other editors just decode the entire file in the background to an uncompressed video file on disc. This allows faster seeking, easy to display thumbnails, and real time previews of transitions and other effects. However that technique takes up a LOT of extra disk space and we've always resisted doing it for that reason.
Good to know!

Your last bit sounds like a "proxy" file...as a user selectable option that might be interesting if it is easy for you to setup in VRD.
I would probably use it but it would be a rare thing.

I've never created a proxy file myself. I've read of such over on "Linus Tech Tips" where they are working with 8k-16k resolution and it's a matter of starting the creation of a proxy file then go take lunch and come back to see if it is finished.

A couple of minutes would be fine for me to work with but I have no idea of the time we would be talking about with the VRD level of 1080p-4k.

And this one, of having to clean up the creators inserted rubbish is uncommon. These people insert several seconds of multiple images moving on screen in some kind of artistic filter option(?) YECH.

I can get motion sick, my eyes can't stand much of that at all. And I will rip it out anywhere I find it.

Thanks.
 
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