So i have recently tried installing the Replay Mod, and had to trouble with that. I used forge and all of the recommended builds. My problem is with installing the optional FFMPEG, which I think is installed correctly. After getting frustrated by lack of instruction, I discovered that it was necessary to use 7-zip. I have extracted the files, and run the .bat file. It looks as though everything should work, but when I try to render the video, it displays the error for when it is not installed. I have also tried doing the thing where you define where the encoder is in the command line settings, but that yielded the same result.
Any help would be appreciated. Thanks
By the way, I run java 7-79, 64 bit, windows 7, and all of the versions of said programs are the recommended ones. Thanks.