Stuart Henderson <s...@spacehopper.org> writes:

[...]
> So this works around the recently-reported hangs seen on amd64 but we
> still have a segfault issue on i386 (I've only seen this so far when
> decoding H264, though given the function other things may use it too).

Probably same as https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=205958
Update to FFmpeg 3.2+ or try the following patch.

--- configure~
+++ configure
@@ -5685,6 +5685,10 @@ elif enabled llvm_gcc; then
     check_cflags -mllvm -stack-alignment=16
 elif enabled clang; then
     check_cflags -mllvm -stack-alignment=16
+    check_cflags -mstack-alignment=16
+    if enabled x86_32; then
+        check_cflags -mstackrealign
+    fi
     check_cflags -Qunused-arguments
     check_cflags -Werror=implicit-function-declaration
     check_cflags -Werror=missing-prototypes

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