I generated my first interior animation and I immediately had a problem with it. I searched a bit on Google but didn’t find a similar problem. Maybe I can’t properly name in English what I see in my film. I posted the video on YouTube and the problem is a bit blurred - it’s probably YouTube compression. I hope you can see that in this video. What I mean is that the forest and the carpet seem to be slightly moving, waving, or the pixels are constantly moving. He cries or trembles. I do not know how to call it. I also don’t know what could be the reason for this effect. The forest is generated by geoscatter and the carpet is generated by particles. Maybe there’s a problem here somewhere. I didn’t find any keyframes related to this. Maybe someone who has already encountered this can help me understand what’s going on? Regards
Your video is set to private.
Sorry, I’ve already fixed it.
It looks like a “low sample count denoise flicker” (Not an official term) to me. Have you tried rendering with a few more samples and seeing if it helps?
Thanks for your reply.
I used AVIjpg 24fps. Maybe changing FFmpeg will make a difference. There is not much to change in the AVI settings. The film was made of 100 frames.
Maybe? I don’t know much about that, but by samples I meant these over here
if they’re too low, and using denoise, I get flickers like yours in my own animations. Turning the samples up can help a lot with that flickering.
I reduced the samples to 50 to speed up the render time. I see, I have to wait a little longer for a good effect. I will make a new render and share the result. Thanks.
You should allways render animations to image sequences (for example png or openEXR) and then render these image sequences into the final movie with the VSE or some other video editing app.
But I agree that your flickering problem is due to low samples.
Thanks for your reply.
My previous videos made on other software were made from a sequence of jpg files and then assembled in Power Director.
Should we still make videos using separate frames? How to edit such a large number of frames?
My attempts so far result from the desire to find a way to save time preparing the animation.
Regards
Hi there,
I render animations at 25 samples with denoise and I have never had flickering issues like in your video. But at the same time, I’m rendering low poly stuff, not grass and trees. So you might need more samples.
You should always, always, always do this:
but never do this:
As I understand it, png is a lossless format, where as jpg images sacrifice image quality for the sake of reduced file size. openEXR is even better than png, but overkill for the simple animations I do.
The reason why you want to render to images, and not to video is simple. You said this was 100 frames. Let’s say each frame takes 1 minute to render. Total render time would be 100 minutes. Now let’s say on frame 99 something happens, like blender crashes, a slight flicker in the electricity, or your cat runs across the keyboard and hits the ESC key and cancels your render. The video file you were rendering to wouldn’t be complete and you’d have to start over. If you’re rendering to images, you’d only have to render the last 2.
Render to images, then from blender’s File menu, choose New → Video Editing. That will set you up in a workspace to use blenders VSE (video sequence editor). From here you can load in a sequence of images and set your output to be a video format, then render it giving you the video file.
In your case, rendering to images could help you figure out what the problem is. Render 20 images, load those images into the VSE and preview the playback. If the playback shows flickering, then probably not enough render samples…
just my thoughts,
Randy
Sequence Images are images listed as frames.
This is recognized by editing software in the same way as video clips.
However, you need to use the Sequence Player to easily view the rendered image as a video.
DJV is a free sequence player.
https://darbyjohnston.github.io/DJV/
Rendering with Sequence Images is because you can quickly recover from file corruption or mistakes.
(It is not easy to recover after rendering only problematic frames, when using video clips.)
Thanks for advice.
I agree. I once had a program error when recording a video to an mpeg file.
Now I use Power Director. It is good for image sequences.
Regards
Thanks for your valuable advice.
I re-rendered the entire sequence at 250 samples. It took about 3 hours.The flickering of the forest and carpet is still visible. In my opinion, it’s about things based on particles and materials associated with them. Maybe I’ll take a close-up of the carpet and poke fun at this thread.
Regards
It has probably nothing to do directly with particles. But it does have to do with lots of small stuff being in the same area. If you look at your second render then flickering is a lot less. That is because you used more samples
The flickering comes from each frame getting slightly different lighting and shadows in each frame which again results from too little samples. The artefacts are more visible in places where a lot off differences in shading are mashed into a small area. Objects that get indirect light only are particularly intensive to render.
If you up the samples the differences in shading will get reduced and the denoiser will take care of the rest. I’d try 1000 sample or something like that.
You also have quite some flicker in the black, round table and the floor in the area bellow the shelve (where it does not get direct lighting). But it is hard to tell if that might be just YT compression.
This problem is still caused by noise.
In particular, it can be easily identified in dark areas and areas where particles are gathered (leaf, carpet).
In general, you need to raise the rendering sample value.
Or review the method of the video.
Using a EEVEE is one way.
A good EEVEE setting can also produce results similar to Cycles.
Took a look at your latest, a really ‘up close’ look (full screen, 1080p) and yes, I think it’s still noisy and you need more samples. But I also just noticed your camera motion isn’t smooth. The camera ‘stutters’ repeatedly as it moves left to right. So now I have to ask, are you using motion blur for your renders?
If motion blur is turned on, that along with the uneven camera motion can cause ‘blurry’ problems in your renders.
Randy
My camera is not smooth because I used the wrong settings in Power Director. I fixed it using DaVinci. Now the video is smooth but still flickers slightly in the forest and carpet area.
The main problem is that there is a huge amount of geometry in the scene. By increasing the number of samples, the frame rendering time increases dramatically. I think this is going in the wrong direction. The attached video took my computer half a day to complete. I’m thinking about replacing the forest with a rendered image of trees to speed it up. I will also do a close-up test of the carpet and see where the flickering is coming from. I am very curious about this test…
Regards
PS: My camera is not set to motion blur.
I took a close-up of the carpet. 10 frames. Number of samples 1024. No motion blur (as usual). To me, this carpet sparkles. The problem is not the samples. Pay attention to the rest of the scene. Chairs, shadows, everything flickers. Maybe the world is not constant, maybe reflections from scene elements…
I have no idea.
Grzegorz
What level of denoise are you using?
