Cauldron's devede is currently at 3.21, which tries to call ffmpeg with the deprecated switch "-loop_input". ffmpeg no longer accepts this switch, and throws an error that aborts ISO creation. According to the devede forums, version 3.22 is available and corrects this.
CC: (none) => fundawangAssignee: bugsquad => doktor5000
3.22.0 has been pushed nealy 4 weeks ago, so marking as resolved. Please reopen if the issue still persists.
Status: NEW => RESOLVEDCC: (none) => doktor5000Resolution: (none) => FIXED