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* Fix macOS Big Sur crash with CVBufferCopyAttachments Add FFmpeg patch to use weak_import for CVBufferCopyAttachments API to prevent dyld crash on macOS Big Sur (11.x). The CVBufferCopyAttachments function is only available on macOS 12+. Even though FFmpeg has a runtime check with __builtin_available, the symbol is still resolved at load time, causing immediate crash on older macOS versions. With weak_import attribute, the function pointer will be NULL on macOS < 12, allowing the code to safely fall back to the deprecated CVBufferGetAttachments API. Fixes: #13377 * update common