[FFmpeg-devel] FFmpeg for Mac
Wed May 20 19:49:50 CEST 2009
On May 20, 2009, at 1:27 PM, Neal Krawetz wrote:
> Hi folks,
> I managed to port FFMpeg to Macs as a Universal Binary (runs on both
> and x86 architectures). There were a couple of changes that I needed
> to make in order for this work.
> I've tested this on the x86 architecture. It compiles for a PPC,
> but I
> have not tested it yet. I suspect that it will fail because the
> is hard-coded in config.h.
CFLAGS='-arch ppc -arch i386' ../configure --arch=x86
ARCH unknown (generic)
$ file ffmpeg
ffmpeg: Mach-O executable i386
which is completely broken.
IIRC ld only supports one architecture at a time so you'd have to use
lipo in the last step anyway. Plus it's impossible to build MMX/SSE/
Altivec optimizations this way.
> Anyway, here is my notes of things I needed to change for porting to
> the Mac:
> * Install ffmpeg.
> Unforutnately, ffmpeg does not support universal binaries and
> does not set all of the configuration variables correctly. So we
> force it.
> Edit libavformat/framehook.c and comment out the header check:
> // #if HAVE_DLFCN_H
> #include <dlfcn.h>
> // #endif
> This header DOES exist when Xcode for MacOSX 10.5 is installed.
gcc-4.0: -E, -S, -save-temps and -M options are not allowed with
multiple -arch flags
is the reason these aren't set.
More information about the ffmpeg-devel