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Date:      Thu, 16 Dec 2021 17:07:47 +0000
From:      bugzilla-noreply@freebsd.org
To:        multimedia@FreeBSD.org
Subject:   [Bug 260432] multimedia/ffmpeg mp4-> aac -> mp3 (libmp3lame) fails with Illegal instruction on i386
Message-ID:  <bug-260432-12827-YFT45Y8DtZ@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-260432-12827@https.bugs.freebsd.org/bugzilla/>
References:  <bug-260432-12827@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D260432

--- 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=3D-g STRIP=3D STRIP_CMD=3Dtrue
  $ make clean all deinstall install DEBUG_CONFIGURE_OFF=3D"--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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