I tried compiling the multibit version with Phyllis' instructions (which are also found in the manual: https://cinelerra-gg.org/download/CinelerraGG_Manual/Multibit_build_x265_8_1...). With Andrew's new patch "x265-17122023" I have a crash. I attach the cin5_patch.log. Without the new patch the build works. I have a Ryzen 5900XT 12c/24t. I generally compile in just over 3 min. Multibit took a little over 4 min. NOTE: By applying the "compile_multibit_X265.txt" there is no need to manually edit ../thirdparty/Makefile, it is done automatically. I compared the appimage (without new patch) multibit with the build (without new patch) multibit: I get the same rendering results. The only difference, as Phyllis had explained, is that in my build the hevc.mp4 preset also works while in the appimage it does not.