Replay Mod Forums
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Although I can't comment on the crash log since I don't develop the mod itself, I will paste something directly from the documentation:3.5.6.2 Crash while rendering
If Minecraft crashes after a few frames of rendering, it most likely means that FFmpeg didn't like the Command Line Arguments you passed. If you customized the Command Line Arguments manually, re-check them - it's probably your own fault.
Hint: In your .minecraft folder, you'll find a file called export.log which contains information about FFmpeg's rendering process.
If you did not customize the Command Line Arguments, you might have entered some insanely high (or low) values e.g. for Bitrate or Video Resolution. Try again with other, more reasonable values.
Did you use custom command line arguments or did you use a default preset?
Also, what other mods have you got installed, if any?
Shaders and Optifine are currently not compatible with the render feature.
Follow this guide and supply the devs with as much information as possible:
How to make an effective bug report
You can paste the information right here in your own thread :)