构建 OpenCV 2.4.x "Undefined reference to av_opt_set@LIBAVUTIL_51"时出错

Question

我试过构建2.4的所有版本，当"链接CXX可执行文件../.."时，它们都失败了。/bin/opencv_test_core":

/usr/local/lib/libavcodec.so.54: undefined reference to `av_opt_set@LIBAVUTIL_51'
/usr/local/lib/libavformat.so.54: undefined reference to `av_strcasecmp@LIBAVUTIL_51'
/usr/local/lib/libavcodec.so.54: undefined reference to `av_bprint_finalize@LIBAVUTIL_51'
/usr/local/lib/libavformat.so.54: undefined reference to `av_timecode_make_smpte_tc_string@LIBAVUTIL_51'
/usr/local/lib/libavformat.so.54: undefined reference to `av_timecode_make_string@LIBAVUTIL_51'
/usr/local/lib/libavcodec.so.54: undefined reference to `av_realloc_f@LIBAVUTIL_51'
/usr/local/lib/libavformat.so.54: undefined reference to `av_timecode_get_smpte_from_framenum@LIBAVUTIL_51'
/usr/local/lib/libavformat.so.54: undefined reference to `av_timecode_init@LIBAVUTIL_51'
/usr/local/lib/libavcodec.so.54: undefined reference to `av_samples_set_silence@LIBAVUTIL_51'
/usr/local/lib/libavcodec.so.54: undefined reference to `av_calloc@LIBAVUTIL_51'
/usr/local/lib/libavformat.so.54: undefined reference to `av_opt_get@LIBAVUTIL_51'
/usr/local/lib/libavformat.so.54: undefined reference to `av_strncasecmp@LIBAVUTIL_51'
/usr/local/lib/libavcodec.so.54: undefined reference to `av_samples_fill_arrays@LIBAVUTIL_51'
/usr/local/lib/libavcodec.so.54: undefined reference to `av_get_media_type_string@LIBAVUTIL_51'
/usr/local/lib/libavformat.so.54: undefined reference to `av_dynarray_add@LIBAVUTIL_51'
/usr/local/lib/libavcodec.so.54: undefined reference to `av_bprint_init@LIBAVUTIL_51'
/usr/local/lib/libavcodec.so.54: undefined reference to `av_asprintf@LIBAVUTIL_51'
/usr/local/lib/libavcodec.so.54: undefined reference to `av_sample_fmt_is_planar@LIBAVUTIL_51'
/usr/local/lib/libavcodec.so.54: undefined reference to `av_samples_get_buffer_size@LIBAVUTIL_51'
/usr/local/lib/libavformat.so.54: undefined reference to `av_opt_get_int@LIBAVUTIL_51'
/usr/local/lib/libavcodec.so.54: undefined reference to `av_timecode_make_mpeg_tc_string@LIBAVUTIL_51'
/usr/local/lib/libavformat.so.54: undefined reference to `av_rescale_q_rnd@LIBAVUTIL_51'
/usr/local/lib/libavcodec.so.54: undefined reference to `av_bprintf@LIBAVUTIL_51'
/usr/local/lib/libavcodec.so.54: undefined reference to `av_samples_copy@LIBAVUTIL_51'
/usr/local/lib/libavcodec.so.54: undefined reference to `av_get_default_channel_layout@LIBAVUTIL_51'
/usr/local/lib/libavcodec.so.54: undefined reference to `av_timecode_init_from_string@LIBAVUTIL_51'
/usr/local/lib/libavcodec.so.54: undefined reference to `av_bprint_chars@LIBAVUTIL_51'
/usr/local/lib/libavformat.so.54: undefined reference to `av_des_mac@LIBAVUTIL_51'
/usr/local/lib/libavcodec.so.54: undefined reference to `av_timecode_adjust_ntsc_framenum@LIBAVUTIL_51'
/usr/local/lib/libavformat.so.54: undefined reference to `av_timegm@LIBAVUTIL_51'
/usr/local/lib/libavcodec.so.54: undefined reference to `av_tempfile@LIBAVUTIL_51'

我的CMakeLists.txt文件是默认的，除了我把它改为使用TBB，禁用文档，并打开详细模式。

执行ldd/usr/local/lib/libavcodec.so.54我:

root@omap4-multi:~/opencv/2.4.3/build# ldd /usr/local/lib/libavcodec.so.54
    libavutil.so.51 => /usr/local/lib/libavutil.so.51 (0xb6132000)
    libx264.so.123 => /usr/local/lib/libx264.so.123 (0xb5fc4000)
    libvorbisenc.so.2 => /usr/local/lib/libvorbisenc.so.2 (0xb5e4a000)
    libvorbis.so.0 => /usr/local/lib/libvorbis.so.0 (0xb5e14000)
    libtheoraenc.so.1 => /usr/local/lib/libtheoraenc.so.1 (0xb5dcc000)
    libtheoradec.so.1 => /usr/local/lib/libtheoradec.so.1 (0xb5dac000)
    libopencore-amrwb.so.0 => /usr/local/lib/libopencore-amrwb.so.0 (0xb5d93000)
    libopencore-amrnb.so.0 => /usr/local/lib/libopencore-amrnb.so.0 (0xb5d67000)
    libmp3lame.so.0 => /usr/local/lib/libmp3lame.so.0 (0xb5cdd000)
    libfaac.so.0 => /usr/local/lib/libfaac.so.0 (0xb5cc1000)
    libm.so.6 => /lib/libm.so.6 (0xb5c44000)
    libz.so.1 => /usr/lib/libz.so.1 (0xb5c29000)
    libgcc_s.so.1 => /usr/local/lib/libgcc_s.so.1 (0xb5c02000)
    libpthread.so.0 => /lib/libpthread.so.0 (0xb5be3000)
    libc.so.6 => /lib/libc.so.6 (0xb5ab8000)
    libogg.so.0 => /usr/local/lib/libogg.so.0 (0xb5aac000)
    /lib/ld-linux.so.3 (0x42228000)

有谁知道是什么原因造成的，或者我能做些什么来修复它?我做这个已经有一段时间了，我很茫然。

Answer 1

我有一个类似的问题，但这是ffmpeg的问题，如果您升级了ffmpeg的一个或多个依赖项。Ffmpeg需要重新编译或更新其所有依赖

Answer 2

我也有这个问题。即使在重新编译ffmpeg之后，问题仍然存在。最后，我意识到从源代码安装的ffmpeg与apt-get安装的库之间的冲突，我的意思是libavutil-dev, libavutil-extra-51。简单地使用apt-get remove ffmpeg删除ffmpeg并不能解决这个问题。我的解决方案是删除从apt安装的冲突库，如下所示:

sudo apt-get remove libavutil-dev libavutil-extra-51 

希望对你有用