ports/109379: ffmpeg-devel can't dynamically link to faad2

Bill Fenner fenner at research.att.com
Mon Apr 2 17:50:12 UTC 2007

The following reply was made to PR ports/109379; it has been noted by GNATS.

From: Bill Fenner <fenner at research.att.com>
To: ahze at FreeBSD.org
Cc: freebsd-gnats-submit at FreeBSD.org, freebsd-multimedia at FreeBSD.org
Subject: Re: ports/109379: ffmpeg-devel can't dynamically link to faad2
Date: Mon, 2 Apr 2007 10:14:51 -0700

 While faad 2.5,1 includes API compatability,
 as I stated in the description of the problem,
 the linkage that ffmpeg uses is not able to
 use that API compatability.  This is because
 the faad API compatability is performed with
 #defines, and the ffmpeg linkage happens with
 fancy macros that put together the function
 names in a way that doesn't allow the #defines
 to work.
 (The dfaac() macro in libavcodec/faad.c
 uses "faacDec" ## a to put symbols together
 to get, e.g. faacDecGetErrorMessage, into
 strings, which it then looks up in the shared
 library with dlsym(), which never gives the
 "compatability API" a chance to get in the
 Were you able to get the steps in "how-to-repeat:"
 to work, or did you just close the PR because
 you think it is supposed to work?  I think it is
 supposed to work too, but that doesn't mean it does.
 I spent an hour rebuilding faad (of which I already
 had 2.5,1 installed) and ffmpeg-devel (which I upgraded
 from ffmpeg-devel-0.4.9.c.2006032300_4 to
 ffmpeg-devel-0.4.9.c.2006032300_5) to make sure that
 the bug was still there.
 frogbits% pkg_info -I ffmpeg\* faad\*
 faad2-2.5,1         MPEG-2 and MPEG-4 AAC audio decoder
 ffmpeg-devel-0.4.9.c.2006032300_5 Hyper fast realtime audio/video encoder/converter, streamin
 frogbits% ffmpeg -i Diego-2.mp4 /tmp/foo.mpeg
 FFmpeg version CVS, Copyright (c) 2000-2004 Fabrice Bellard
   configuration:  --cc=cc --prefix=/usr/local --make=gmake --disable-debug --enable-memalign-hack --enable-shared --source-path=/usr/ports/multimedia/ffmpeg-devel/work/FFMpeg-2006032300 --enable-a52 --enable-dts --enable-faac --enable-faad --enable-faadbin --enable-gpl --enable-libgsm --enable-mp3lame --enable-libogg --enable-pp --enable-pthreads --enable-vorbis --enable-x264 --enable-xvid 
   libavutil version: 49.0.0
   libavcodec version: 51.8.0
   libavformat version: 50.4.0
   built on Apr  2 2007 10:02:29, gcc: 3.4.4 [FreeBSD] 20050518
 Seems that stream 0 comes from film source: 24000.00 (24000/1) -> 23.98 (24000/1001)
 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Diego-2.mp4':
   Duration: 00:42:45.1, start: 0.000000, bitrate: 1129 kb/s
   Stream #0.0(eng), 23.98 fps(r): Video: mpeg4, yuv420p, 640x480
   Stream #0.1(eng): Audio: aac, 44100 Hz, stereo
 Output #0, mpeg, to '/tmp/foo.mpeg':
   Stream #0.0, 23.98 fps(c): Video: mpeg1video, yuv420p, 640x480, q=2-31, 200 kb/s
   Stream #0.1: Audio: mp2, 44100 Hz, stereo, 64 kb/s
 Stream mapping:
   Stream #0.0 -> #0.0
   Stream #0.1 -> #0.1
 [aac @ 0x28356028]FAAD library: cannot resolve faacDecGetErrorMessage in libfaad.so.0!
 Error while opening codec for input stream #0.1

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