libav: detect versions that are to old for libav muxing

diff --git a/configure b/configure
index 4bdd99ce395a735824181d2293c7d651682e49ae..e9bc7e4e7c3c1b11d4093ed31527bc3a8fee5537 100755 (executable)
--- a/configure
+++ b/configure
@@ -127,7 +127,7 @@ if enabled_or_auto libav; then
     has_libav=false
   fi
 
-  if $has_libav && ! check_pkg libavformat ">=50.43.0"; then
+  if $has_libav && ! check_pkg libavformat ">=53.10.0"; then
     has_libav=false
   fi