The error message “Cinelerra: MWindow::init_shm: /proc/sys/kernel/shmmax is 0x1000000 It should be at least 0x7ffffff” is related to the shared memory setting on your Linux system. Cinelerra, a video editing software, uses shared memory for inter-process communication and the error message indicates that the shared memory limit on your system is not sufficient for the software to run properly.
To resolve this issue, you can increase the shared memory limit by modifying the `/proc/sys/kernel/