build error: missing _av* symbols

[bennykhoo]

My build terminated with some missing symbols (see below log). Later I noticed that the FFMPEG libraries have been taken out from linking. The build complete to last after comment out the line (see patch). Still new to CMake. Do I miss something? Thx!

diff --git a/libobs/CMakeLists.txt b/libobs/CMakeLists.txt

index 2f5120f..dcdda94 100644

--- a/libobs/CMakeLists.txt

+++ b/libobs/CMakeLists.txt

@@ -7,7 +7,7 @@ find_package(FFMpeg REQUIRED

OPTIONAL_COMPONENTS avcodec)

include_directories(${FFMPEG_INCLUDE_DIRS})

----

-list(REMOVE_ITEM FFMPEG_LIBRARIES ${FFMPEG_AVCODEC_LIBRARIES})

+# list(REMOVE_ITEM FFMPEG_LIBRARIES ${FFMPEG_AVCODEC_LIBRARIES})



find_package(ImageMagick QUIET COMPONENTS MagickCore)


------------------------------

% cmake .. && make

-- Jansson >=2.5 not found, building bundled version

-- Found FFMpeg: /opt/local/lib/../lib/libavformat.dylib (found version "56.4.101") found components: avformat avutil swscale swresample avcodec

-- Using ImageMagick for image loading in libobs

-- Libfdk not found - obs-libfdk plugin disabled

-- Found FFMpeg: /opt/local/lib/../lib/libavcodec.dylib (found version "56.1.100") found components: avcodec avutil swscale avformat swresample

-- Configuring done

-- Generating done

-- Build files have been written to: /Users/bennykhoo/Sources/obs-studio/build

[ 0%] Built target glad

[ 6%] Built target jansson

Linking C shared library libobs.dylib

Undefined symbols for architecture x86_64:

"_av_free_packet", referenced from:

_media_remux_job_process in media-remux.c.o

"_avcodec_copy_context", referenced from:

_media_remux_job_create in media-remux.c.o

ld: symbol(s) not found for architecture x86_64

clang: error: linker command failed with exit code 1 (use -v to see invocation)

make[2]: *** [libobs/libobs.0.dylib] Error 1

make[1]: *** [libobs/CMakeFiles/libobs.dir/all] Error 2

make: *** [all] Error 2

 

[Lain]

Not sure. Where are you getting your FFmpeg from? Personally, I manually compile it. Most people however tend to use macports/brew. Which method are you using?

 

[bennykhoo]

Hi Jim,

I am using macports to source out my FFmpeg installation e.g. sudo port install ffmpeg. Any idea what might be wrong with my ffmpeg installation? Thx

 

[Lain]

Unfortunately, I'm not quite sure. I would say to just compile it manually, just my opinion.

 

[Michael Forrest]

Hi bennykhoo, did you have any luck compiling this? I'm getting the same compile error:

Undefined symbols for architecture x86_64:
"_av_free_packet", referenced from:
_media_remux_job_process in media-remux.c.o

Git blame on the ffmpeg source shows av_free_packet appearing in 2013 though.

6e1b1a27 (Michael Niedermayer 2013-08-30 20:57:55 +0200 219) av_free_packet(pkt);
6e1b1a27 (Michael Niedermayer 2013-08-30 20:57:55 +0200 244) av_free_packet(pkt);
ce1d9c85 (Ramiro Polla 2009-04-30 12:06:34 +0000 280) void av_free_packet(AVPacket *pkt)
94eadee7 (Michael Niedermayer 2011-04-20 03:25:48 +0200 373) av_free_packet(&old);

I've been having trouble compiling ffmpeg but I'm gonna persevere.

 

[Lain]

Yea, some of the functions we use were added semi-recently to FFmpeg. I was unaware of it at the time when I implemented it though.