Hi,
before update x264 to last stable commit
We can analyze ABI changes with pkgdiff , abi-compliance-checker and
abi-dumper
pkgdiff x264-debuginfo-0.130-3.20130502git1db4621.fc20.i686.rpm
x264-debuginfo-0.133-1.20130709git585324f.fc20.i686.rpm -details
http://www.serjux.com/pkgdiff_reports/x264-debuginfo/0.130-3.20130502git1db4621.fc20_to_0.133-1.20130709git585324f.fc20/changes_report.html
http://www.serjux.com/pkgdiff_reports/x264/0.130-3.20130502git1db4621.fc20_to_0.133-1.20130709git585324f.fc20/changes_report.html
avidemux-2.6.4-5.fc20.src.rpm
mythtv-0.26.0-9.fc20.src.rpm