ffmpeg +mmx fails

[steven@…]

Trying to install ffmpeg with mmx fails:

Fails: install ffmpeg +a52 +avfilter +darwin_i386 +extvorbis +faac +faad +gpl +lame +postproc +theora +x264 +xvid +mmx

OK: install ffmpeg +a52 +avfilter +darwin_i386 +extvorbis +faac +faad +gpl +lame +postproc +theora +x264 +xvid

The first fails in some mmx module.

Greetings, Steven

[jmroot (Joshua Root)]

You'll notice that port variants ffmpeg says (in part):

mmx: enable mmx support, experimental; does not build in gcc-4.2 or xcode 3.0 gcc-4.0

[dbevans (David B. Evans)]

The mmx variant description is quite old and there have been a lot of changes in ffmpeg/ffmpeg-devel recently.

This requires some one with an Intel box to check and see if the current ffmpeg/ffmpeg-devel ports continue to have this problem or not and why. If there is a problem as described and it can be corrected, the results should be forwarded to the upstream developers as they are now bug fixing for a new release scheduled for about two weeks from now.

[ddennedy (Dan Dennedy)]

Heh, for me it does not even build on 10.5 Intel even when using variant specification -mmx !

I synced today.

$ sudo port -c -d install ffmpeg-devel -mmx

...
DEBUG: Environment: CFLAGS='-O2 -DHAVE_LRINTF -I/opt/local/include' CPPFLAGS='-I/opt/local/include' CXXFLAGS='-O2' MACOSX_DEPLOYMENT_TARGET='10.5' CPP='/usr/bin/cpp-4.0' CXX='/usr/bin/g++-4.0' F90FLAGS='-O2' LDFLAGS='-L/opt/local/lib' FCFLAGS='-O2' OBJC='/usr/bin/gcc-4.0'
INSTALL='/usr/bin/install -c' OBJCFLAGS='-O2' FFLAGS='-O2' CC='/usr/bin/gcc-4.0'
DEBUG: Assembled command: 'cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_multimedia_ffmpeg-devel/work/trunk" && ./configure --prefix=/opt/local --disable-vhook --enable-gpl --enable-postproc --enable-swscale --enable-avfilter --enable-avfilter-lavf --enable-libmp3lame --enable-libvorbis --enable-libtheora --enable-libdirac --enable-libschroedinger --enable-libfaac --enable-libfaad --enable-libxvid --enable-libx264 --mandir=/opt/local/share/man --enable-shared --enable-pthreads --disable-mmx --cc=gcc-4.0'

...NOTE MMX is requested disabled...
gcc-4.0 -dynamiclib -Wl,-single_module -Wl,-install_name,/opt/local/lib/libswscale.dylib,-current_version,1.6.1,-compatibility_version,1 -Wl,-read_only_relocs,suppress -L"/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_multimedia_ffmpeg-devel/work/trunk"/libavutil -Wl,-dynamic,-search_paths_first -L/opt/local/lib -o libswscale/libswscale.1.dylib libswscale/rgb2rgb.o libswscale/swscale.o libswscale/swscale_avoption.o libswscale/yuv2rgb.o -lavutil -L"/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_multimedia_ffmpeg-devel/work/trunk"/libavutil -lavutil -lz -lbz2 -lm -ldirac_decoder -ldirac_encoder -lfaac -lfaad -lmp3lame -lm -L/opt/local/lib -lschroedinger-1.0 -lpthread -loil-0.3 -ltheora -logg -lvorbisenc -lvorbis -logg -lx264 -lm -lxvidcore
ld: absolute addressing (perhaps -mdynamic-no-pic) used in _rgb24tobgr24_MMX from libswscale/rgb2rgb.o not allowed in slidable image

---

This symbol appears in libswscale/rgb2rgb.c.

I have to use the no_gpl variant to install this today.

[ddennedy (Dan Dennedy)]

Cc Me!

[dbevans (David B. Evans)]

Looks like two issues here:

It appears that recent changes to libswscale/rgb2rgb.c upstream have reorganized the ifdef semantics in such a way that the various intel optimizations are compiled any time that a x86 platform is detected in configure without regard to the setting of the --disable-mmx switch. As you say, the code is disabled however if you select the +no_gpl variant since this code is licensed under gpl. This needs to be reported upstream.

Besides this, the error type noted above is one that is often seen as a result of a bug in the XCode 3.0 linker that was fixed in XCode 3.1. See the XCode release notes (see ​http://developer.apple.com/releasenotes/DeveloperTools/RN-Id/index.html) under Bugs fixed in XCode 3.1

No support for text relocs

Assembly code that uses instructions that require dyld to update the instructions at runtime are currently unsupported. The previous linker allow them with the option -read_only_relocs suppress

This should work on Tiger (XCode 2.5) and Leopard with XCode 3.1.

So are you using XCode 3.0 by any chance?

[dbevans (David B. Evans)]

Cc Me!

[steven@…]

I was using XCode 3.0 yes, but upgraded now to 3.1.2.

[dbevans (David B. Evans)]

So did that solve the problem for you (except for the --disable-mmx not working)? If not, is the error any different now?

[ddennedy (Dan Dennedy)]

Upgrading XCode to 3.2.1 fixed the build for me without having to specify a variant!

[(none)]

Milestone Port Bugs deleted