thanks for your answer, but there a new error message:
/home/martin/rpmbuild/BUILDROOT/mlt-freeworld-6.12.0-1.fc29.x86_64/usr/bin/melt
+ grep -vP 'mlt/avformat|libmltavformat.so'
+ find /home/martin/rpmbuild/BUILDROOT/mlt-freeworld-6.12.0-1.fc29.x86_64 -type f -print0
+ xargs -0 rm
rm: cannot remove 'Binary file (standard input) matches'$'\n': No such
file or directory
error: Bad exit status from /var/tmp/rpm-tmp.xUeMnu (%install)
RPM build errors:
Bad exit status from /var/tmp/rpm-tmp.xUeMnu (%install)