[Ffmpeg-devel] Illegal instruction error for ffmpeg and x264 on Intel iMac

[Laine Lee]

I'm trying to use ffmpeg and x264 in combination to convert mpeg2 to h.264
mp4 on an Intel iMac. The iMac has Mac OS X 10.4.5 and the latest version of
the Xcode developer tools installed. Both ffmpeg and x264 have been
successfully compiled on both the Intel and a PPC with the following
configuration.

The configuration of ffmpeg compiled from today's CVS is
"--enable-faac --enable-faad --disable-vhook --disable-ffplay
--disable-ffserver --enable-a52 --enable-x264 --enable-pthreads --enable-gpl
--enable-memalign-hack --disable-mmx". The "--enable-memalign-hack" and
"--disable-mmx" were omitted when building on a PPC.

The configuration of x264, the source of which is the latest source download
from videolan.org, is "--enable-pthread --enable-mp4-output".

The command issued is "ffmpeg -i /video.mpg -f rawvideo -s 320x240 - | x264
-o /output.mp4 - 320x240"

The above command can be executed successfully on the Intel and on a PPC
when ffmpeg and x264 are built with the above configuration on a PPC. It can
be executed successfully on the Intel when ffmpeg is built with the above
configuration on either the Intel or the PPC and x264 is built with the
above configuration on a PPC. If x264 is built with the above configuration
on the Intel, the command fails on the Intel with the following output in
the Terminal window.

...
 libavutil version: 49.0.0
  libavcodec version: 51.8.0
  libavformat version: 50.4.0
  built on Mar 31 2006 12:29:38, gcc: 4.0.1 (Apple Computer, Inc. build
5250)
x264 [info]: using cpu capabilities MMX MMXEXT SSE SSE2
mp4 [info]: initial delay 0 (scale 25)
Input #0, mpeg, from '/video.mpg':
  Duration: 00:00:26.4, start: 5810.226022, bitrate: 4341 kb/s
  Stream #0.0[0x1e0], 29.97 fps(r): Video: mpeg2video, yuv420p, 720x480,
7000 kb/s
  Stream #0.1[0x80]: Audio: ac3, 48000 Hz, 5:1, 448 kb/s
Output #0, rawvideo, to 'pipe:':
  Stream #0.0, 29.97 fps(c): Video: rawvideo, yuv420p, 320x240, q=2-31, 200
kb/s
Stream mapping:
  Stream #0.0 -> #0.0
Press [q] to stop encoding
Illegal instruction

Why can the command be completed successfully on the Intel using the PPC
built version of x264 but not the Intel built version? Thanks.

-- 
Laine Lee