Ffmpeg compilation fails due to undefined symbol _x264_encoder_open_112 for architecture x86_64

Question

I am compiling ffmpeg on Snow Leopard from source. Using Macport is not an option since I have some custom modification in ffmpeg. The make commands are:

$ ./configure --enable-gpl --enable-libmp3lame --enable-static \
            --disable-shared --enable-libx264 --enable-pthreads \
            --disable-doc --enable-avfilter
$ make

The error:

CC  ffplay.o
ffplay.c: In function ‘SDL_main’:
ffplay.c:3157: warning: assignment discards qualifiers from pointer target type
LD  ffplay_g
Undefined symbols for architecture x86_64:
  "_x264_encoder_open_112", referenced from:
      _X264_init in libavcodec.a(libx264.o)
ld: symbol(s) not found for architecture x86_64
collect2: ld returned 1 exit status
make: *** [ffplay_g] Error 1

I have compiled libx264 from source, which went fine.

$ cd x264-snapshot-20101228-2245; ./configure && make && sudo make install

... and it contains the symbol "_x264_encoder_open_112"

$ nm ./libx264.a | grep _x264_encoder_open_112
0000000000003ef0 T _x264_encoder_open_112
000000000000d7b0 S _x264_encoder_open_112.eh

What might be going wrong?

did you ever resolve this? I am having the exact same issue... — beardedd, Jul 08 '11 at 00:43
@beardedd I don't have a precise answer but I had to proceed by rebuilding the libraries. I guess that there was a conflict from macport. So, you might want to temporarily remove those libs to force gcc to pick x264.a from `/usr` and not `/opt`. Keep us posted! — S B, Jul 11 '11 at 09:58

score 3 · Accepted Answer · answered Aug 18 '11 at 16:10

3

There was a conflict between similarly named libs from /opt/local/lib and /usr/lib. The former is maintained by Macport and the latter was my own dev area. Since I wanted to use the latter location, I had to remove / temporarily rename the ones in /opt/local/lib to force gcc to pick them up from /usr/lib

In your case, the paths may vary, but you get the idea.

If you have a cleaner way to achieve this, I am all ears

answered Aug 18 '11 at 16:10

S B

8,134
10
54
108

2

I had the same problem and I just removed /opt/local/lib from my path while I did ./configure, solved the problem. After building I put it back in my path. – dcoffey3296 Jun 10 '12 at 03:14

score 0 · Answer 2 · answered Jun 27 '11 at 08:31

0

Try to configure x264 with --enable-static.

I had a similar problem, and that was a solution for me.

answered Jun 27 '11 at 08:31

weekens

8,064
6
45
62

Hi @weekens, I am afraid this does not work because x264's configure does not accept --enable-static. `$ ./configure --enable-static Unknown option --enable-static, ignored` – S B Jun 27 '11 at 09:02
@Saptarshi, that is strange, it was working for me before. Try taking my branch from Github, just to check if it works. `git clone git://github.com/weekens/x264-devel.git` – weekens Jun 27 '11 at 10:19
You are right - the latest source from `git://git.videolan.org/x264.git` indeed supports the --enable-static option. I had been using an old snapshot, which was the source of confusion. However, using --enable-static does not solve my problem. This is expected because I already had a static .a library. – S B Jun 29 '11 at 09:08

score 0 · Answer 3 · answered Feb 22 '12 at 23:23

I'm going to add for users of Homebrew on Mac OSX having this issue:

I had extra libx264 libs in /usr/lib as well that I had to remove.

This resulted in this error in building ffmpeg with brew install ffmpeg --use-clang or brew install ffmpeg --use-gcc:

LD  libavcodec/libavcodec.53.dylib
AR  libavcodec/libavcodec.a
Undefined symbols for architecture x86_64:
  "_x264_bit_depth", referenced from:
      _X264_init_static in libx264.o
      _X264_frame in libx264.o
  "_x264_picture_init", referenced from:
      _X264_frame in libx264.o
  "_x264_param_default_preset", referenced from:
      _X264_init in libx264.o
  "_x264_param_apply_fastfirstpass", referenced from:
      _X264_init in libx264.o
  "_x264_param_apply_profile", referenced from:
      _X264_init in libx264.o
  "_x264_encoder_open_120", referenced from:
      _X264_init in libx264.o
ld: symbol(s) not found for architecture x86_64
collect2: ld returned 1 exit status
make: *** [libavcodec/libavcodec.53.dylib] Error 1

The extra files were:

/usr/lib/libx264.79.dylib
/usr/lib/libx264.a
/usr/lib/libx264.dylib

However these versions may vary. After removal, the build succeeded.

Leaving this answer here because it was very confusing trying to find the connection to libavcodec failing.

Ffmpeg compilation fails due to undefined symbol _x264_encoder_open_112 for architecture x86_64

3 Answers3