I've been playing around with the animation feature lately and have been attempting some fairly simple Mandelbrot zooms at low magnification. I created an AVI file for a 15 second video (both 60fps and 30fps) at 3840x2160 resolution, but when I tried to load it up I get an error that the video file is unplayable due to possible corruption. I attempted to play the file under 4 different media player programs in Windows 10 including with the native media player.

Here's the log file for the render:

9/21/2023 5:15:06 PM: Starting job Fractal1.
9/21/2023 5:15:06 PM: Anti-aliasing off.
9/21/2023 5:15:06 PM: Motion blur off.
9/21/2023 5:15:06 PM: Rendering in AVI format. Quality: 100%.
9/21/2023 5:15:06 PM: Calculating Fractal1.
9/21/2023 5:15:06 PM: Calculating frame 1.
9/21/2023 5:15:08 PM: Calculating frame 2.
9/21/2023 5:15:10 PM: Calculating frame 3.
...
9/21/2023 6:32:05 PM: Calculating frame 898.
9/21/2023 6:32:17 PM: Calculating frame 899.
9/21/2023 6:32:29 PM: Calculating frame 900.
9/21/2023 6:32:42 PM: Finished calculation. Time: 1:17:35.76.
9/21/2023 6:32:42 PM: Saving to E:\Fractals\Video\Fractal1.avi.
9/21/2023 6:35:28 PM: Job finished.
I've been playing around with the animation feature lately and have been attempting some fairly simple Mandelbrot zooms at low magnification. I created an AVI file for a 15 second video (both 60fps and 30fps) at 3840x2160 resolution, but when I tried to load it up I get an error that the video file is unplayable due to possible corruption. I attempted to play the file under 4 different media player programs in Windows 10 including with the native media player. Here's the log file for the render: ```` 9/21/2023 5:15:06 PM: Starting job Fractal1. 9/21/2023 5:15:06 PM: Anti-aliasing off. 9/21/2023 5:15:06 PM: Motion blur off. 9/21/2023 5:15:06 PM: Rendering in AVI format. Quality: 100%. 9/21/2023 5:15:06 PM: Calculating Fractal1. 9/21/2023 5:15:06 PM: Calculating frame 1. 9/21/2023 5:15:08 PM: Calculating frame 2. 9/21/2023 5:15:10 PM: Calculating frame 3. ... 9/21/2023 6:32:05 PM: Calculating frame 898. 9/21/2023 6:32:17 PM: Calculating frame 899. 9/21/2023 6:32:29 PM: Calculating frame 900. 9/21/2023 6:32:42 PM: Finished calculation. Time: 1:17:35.76. 9/21/2023 6:32:42 PM: Saving to E:\Fractals\Video\Fractal1.avi. 9/21/2023 6:35:28 PM: Job finished. ````
 
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I just figured out what the problem was. It seems there's a 4 GB cap on the size of the files Ultra Fractal will generate. My guess is that the files are getting truncated which is the reason for the corruption. It looks like I'll need to figure out some alternatives to generating high-resolution video files

I just figured out what the problem was. It seems there's a 4 GB cap on the size of the files Ultra Fractal will generate. My guess is that the files are getting truncated which is the reason for the corruption. It looks like I'll need to figure out some alternatives to generating high-resolution video files
 
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Ultra Fractal uses the built-in AVI interface on Windows which unfortunately is not faultless. For serious renders, I always recommend to render to a series of images (e.g. in PNG format) and then convert them to a movie file with a separate program like VirtualDub (https://www.virtualdub.org/). This also has the advantage that you can experiment with video encoding settings without having to redo the fractal calculations.

Ultra Fractal uses the built-in AVI interface on Windows which unfortunately is not faultless. For serious renders, I always recommend to render to a series of images (e.g. in PNG format) and then convert them to a movie file with a separate program like VirtualDub (https://www.virtualdub.org/). This also has the advantage that you can experiment with video encoding settings without having to redo the fractal calculations.

Ultra Fractal author

 
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I'm learning this as I go as I don't have a whole lot of experience with video editing or creation beyond what OBS does for me. I've been playing around with the ffmpeg utility and that generates decent videos pretty quickly but I'm running into artifacts in the render (especially in the gradients) that are tricky to resolve. I'll take a look at that virtualdub tool to see if it's a bit more newbie-friendly.

I'm learning this as I go as I don't have a whole lot of experience with video editing or creation beyond what OBS does for me. I've been playing around with the ffmpeg utility and that generates decent videos pretty quickly but I'm running into artifacts in the render (especially in the gradients) that are tricky to resolve. I'll take a look at that virtualdub tool to see if it's a bit more newbie-friendly.
 
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