[Bug 260432] multimedia/ffmpeg mp4-> aac -> mp3 (libmp3lame) fails with Illegal instruction on i386

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=260432

--- Comment #1 from Jan Beich <jbeich@FreeBSD.org> ---
Does standalone lame encoding work fine? If so rebuild ffmpeg with debug
symbols but leave optimization enabled then get a backtrace and disassemble the
crashing instruction. For example,

  $ export CFLAGS=-g STRIP= STRIP_CMD=true
  $ make clean all deinstall install DEBUG_CONFIGURE_OFF="--disable-debug
--disable-stripping"
  $ lldb -- `which ffmpeg` -i renamed.aac renamed.mp3
  (lldb) run
  (lldb) bt
  (lldb) dis

Also extract CPU description/features from dmesg output. It's going to be
necessary to compare the crashing instruction against what your CPU really
supports.

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