今天cross complier 出現下列錯誤，
1.
/libavcodec.a(iirfilter.o): undefined reference to symbol 'tan@@GLIBC_2.4'
2.
lib/libx264.a(opencl.o): undefined reference to symbol 'dlsym@@GLIBC_2.4'
lib/arm-linux-gnueabihf/libdl.so.2: error adding symbols: DSO missing from command line
解決方案：
在Makefile 加上-ldl
3.
/home/frank/ffmpeg/libavfilter/vf_pp.c:132: undefined reference to `pp_postprocess'
/home/frank/hpbProject/ffmpeg_RPi/rpi_app/opt/ffmpeg_RPi/stuff/lib/libavfilter.a(vf_pp.o): In function `pp_config_props':
/home/frank/ffmpeg/libavfilter/vf_pp.c:105: undefined reference to `pp_get_context'
/home/frank/hpbProject/ffmpeg_RPi/rpi_app/opt/ffmpeg_RPi/stuff/lib/libavfilter.a(vf_pp.o): In function `pp_uninit':
/home/frank/ffmpeg/libavfilter/vf_pp.c:151: undefined reference to `pp_free_mode'
/home/frank/ffmpeg/libavfilter/vf_pp.c:153: undefined reference to `pp_free_context'
/home/frank/hpbProject/ffmpeg_RPi/rpi_app/opt/ffmpeg_RPi/stuff/lib/libavfilter.a(vf_pp.o): In function `pp_init':
/home/frank/ffmpeg/libavfilter/vf_pp.c:56: undefined reference to `pp_get_mode_by_name_and_quality'
collect2: error: ld returned 1 exit status
解決方案：
在Makefile 加上-ldl
載入載入libb有順序要求
-L$(FFMPEG_DIR)/lib -lpostproc -lavcodec -lavdevice -lavfilter -lavformat -lavuti l -lswresample -lswscale -lx264
from:
http://lists.ffmpeg.org/pipermail/ffmpeg-devel/2012-July/127433.html
1.
/libavcodec.a(iirfilter.o): undefined reference to symbol 'tan@@GLIBC_2.4'
解決方案：
在Makefile 加上-lm
2.
lib/libx264.a(opencl.o): undefined reference to symbol 'dlsym@@GLIBC_2.4'
lib/arm-linux-gnueabihf/libdl.so.2: error adding symbols: DSO missing from command line
解決方案：
在Makefile 加上-ldl
3.
/home/frank/ffmpeg/libavfilter/vf_pp.c:132: undefined reference to `pp_postprocess'
/home/frank/hpbProject/ffmpeg_RPi/rpi_app/opt/ffmpeg_RPi/stuff/lib/libavfilter.a(vf_pp.o): In function `pp_config_props':
/home/frank/ffmpeg/libavfilter/vf_pp.c:105: undefined reference to `pp_get_context'
/home/frank/hpbProject/ffmpeg_RPi/rpi_app/opt/ffmpeg_RPi/stuff/lib/libavfilter.a(vf_pp.o): In function `pp_uninit':
/home/frank/ffmpeg/libavfilter/vf_pp.c:151: undefined reference to `pp_free_mode'
/home/frank/ffmpeg/libavfilter/vf_pp.c:153: undefined reference to `pp_free_context'
/home/frank/hpbProject/ffmpeg_RPi/rpi_app/opt/ffmpeg_RPi/stuff/lib/libavfilter.a(vf_pp.o): In function `pp_init':
/home/frank/ffmpeg/libavfilter/vf_pp.c:56: undefined reference to `pp_get_mode_by_name_and_quality'
collect2: error: ld returned 1 exit status
解決方案：
在Makefile 加上-ldl
載入載入libb有順序要求
-L$(FFMPEG_DIR)/lib -lpostproc -lavcodec -lavdevice -lavfilter -lavformat -lavuti l -lswresample -lswscale -lx264
from:
http://lists.ffmpeg.org/pipermail/ffmpeg-devel/2012-July/127433.html
Le quartidi 24 messidor, an CCXX, Chau Pham a écrit : > LIBS = -lpostproc -lswresample -lswscale -lavfilter -lavdevice -lavformat -lavcodec -lavutil -lm -ldl -Wl Since you are about tu use static libraries (you did not put --enable-shared and the error messages show .a files), the -l options must be in dependency order. For example, libavfilter uses libswresample and libswscale and is used by libavdevice, so -lavfilter must come after -lavdevice but before -lswscale and -lswresample. You need also to explicitly add the few system libraries ffmpeg depends on in its default build; you already added -lm and -ldl, but you probably need also libz, and possibly the ALSA, SDL, JACK, etc., libraries, depending on what configure has found. Regards, -- Nicolas George -------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: application/pgp-signature Size: 198 bytes Desc: Digital signature URL: <http://ffmpeg.org/pipermail/ffmpeg-devel/attachments/20120711/0344cab9/attachment.asc>
