- FFmpeg for Windows no longer enables libopenh264 (redundant with the native h264 decoder + x264 encoder; its MinGW packaging does not satisfy the static link — Wels* undefined references) - suites_test's question-type call passed a 3-placeholder format with one variadic arg — UB that vsnprintf turns into a SIGSEGV on glibc (masked on macOS); use a placeholder-free format