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2019-07-22 02:21:22 -0600	received badge	● Popular Question (source)
2013-01-06 20:20:42 -0600	commented answer	Error building OpenCV 2.4.x "Undefined reference to av_opt_set@LIBAVUTIL_51" root@omap4-mult:~i# ffmpeg ffmpeg version 0.11.2 Copyright (c) 2000-2012 the FFmpeg developer built on Jan 3 2013 22:25:03 with gcc 4.7.2 configuration: --enable-gpl --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --enable-nonfree --enable-postproc --enable-version3 --enable-x11grab --enable-shared --enable-static --enable-pic libavutil 51. 54.100 / 51. 54.100 libavcodec 54. 23.100 / 54. 23.100 libavformat 54. 6.100 / 54. 6.100 libavdevice 54. 0.100 / 54. 0.100 libavfilter 2. 77.100 / 2. 77.100 libswscale 2. 1.100 / 2. 1.100 libswresample 0. 15.100 / 0. 15.100 libpostproc 52. 0.100 / 52. 0.100
2013-01-06 20:14:30 -0600	commented answer	Error building OpenCV 2.4.x "Undefined reference to av_opt_set@LIBAVUTIL_51" I have it installed, but I'm not sure how to go about testing it. Can you provide me with some advice on how to test it, specifically? Thanks
2013-01-04 20:55:24 -0600	received badge	● Editor (source)
2013-01-04 20:54:22 -0600	asked a question	Error building OpenCV 2.4.x "Undefined reference to av_opt_set@LIBAVUTIL_51" I have tried building all versions of 2.4, and they all fail when "Linking CXX executable ../../bin/opencv_test_core" with: /home/root/opencv/2.4.3/build/lib/libavcodec.so.54: undefined reference to 'av_opt_set@LIBAVUTIL_51' /home/root/opencv/2.4.3/build/lib/libavformat.so.54: undefined reference to 'av_strcasecmp@LIBAVUTIL_51' /home/root/opencv/2.4.3/build/lib/libavcodec.so.54: undefined reference to 'av_bprint_finalize@LIBAVUTIL_51' /home/root/opencv/2.4.3/build/lib/libavformat.so.54: undefined reference to 'av_timecode_make_smpte_tc_string@LIBAVUTIL_51' /home/root/opencv/2.4.3/build/lib/libavformat.so.54: undefined reference to 'av_timecode_make_string@LIBAVUTIL_51' /home/root/opencv/2.4.3/build/lib/libavcodec.so.54: undefined reference to 'av_realloc_f@LIBAVUTIL_51' /home/root/opencv/2.4.3/build/lib/libavformat.so.54: undefined reference to 'av_timecode_get_smpte_from_framenum@LIBAVUTIL_51' /home/root/opencv/2.4.3/build/lib/libavformat.so.54: undefined reference to 'av_timecode_init@LIBAVUTIL_51' /home/root/opencv/2.4.3/build/lib/libavcodec.so.54: undefined reference to 'av_samples_set_silence@LIBAVUTIL_51' /home/root/opencv/2.4.3/build/lib/libavcodec.so.54: undefined reference to 'av_calloc@LIBAVUTIL_51' /home/root/opencv/2.4.3/build/lib/libavformat.so.54: undefined reference to 'av_opt_get@LIBAVUTIL_51' /home/root/opencv/2.4.3/build/lib/libavformat.so.54: undefined reference to 'av_strncasecmp@LIBAVUTIL_51' /home/root/opencv/2.4.3/build/lib/libavcodec.so.54: undefined reference to 'av_samples_fill_arrays@LIBAVUTIL_51' /home/root/opencv/2.4.3/build/lib/libavcodec.so.54: undefined reference to 'av_get_media_type_string@LIBAVUTIL_51' /home/root/opencv/2.4.3/build/lib/libavformat.so.54: undefined reference to 'av_dynarray_add@LIBAVUTIL_51' /home/root/opencv/2.4.3/build/lib/libavcodec.so.54: undefined reference to 'av_bprint_init@LIBAVUTIL_51' /home/root/opencv/2.4.3/build/lib/libavcodec.so.54: undefined reference to 'av_asprintf@LIBAVUTIL_51' /home/root/opencv/2.4.3/build/lib/libavcodec.so.54: undefined reference to 'av_sample_fmt_is_planar@LIBAVUTIL_51' /home/root/opencv/2.4.3/build/lib/libavcodec.so.54: undefined reference to 'av_samples_get_buffer_size@LIBAVUTIL_51' /home/root/opencv/2.4.3/build/lib/libavformat.so.54: undefined reference to 'av_opt_get_int@LIBAVUTIL_51' /home/root/opencv/2.4.3/build/lib/libavcodec.so.54: undefined reference to 'av_timecode_make_mpeg_tc_string@LIBAVUTIL_51' /home/root/opencv/2.4.3/build/lib/libavformat.so.54: undefined reference to 'av_rescale_q_rnd@LIBAVUTIL_51' /home/root/opencv/2.4.3/build/lib/libavcodec.so.54: undefined reference to 'av_bprintf@LIBAVUTIL_51' /home/root/opencv/2.4.3/build/lib/libavcodec.so.54: undefined reference to 'av_samples_copy@LIBAVUTIL_51' /home/root/opencv/2.4.3/build/lib/libavcodec.so.54: undefined reference to 'av_get_default_channel_layout@LIBAVUTIL_51' /home/root/opencv/2.4.3/build/lib/libavcodec.so.54: undefined reference to 'av_timecode_init_from_string@LIBAVUTIL_51' /home/root/opencv/2.4.3/build/lib/libavcodec.so.54: undefined reference to 'av_bprint_chars@LIBAVUTIL_51' /home/root/opencv/2.4.3/build/lib/libavformat.so.54: undefined reference to 'av_des_mac@LIBAVUTIL_51' /home/root/opencv/2.4.3/build/lib/libavcodec.so.54: undefined reference to 'av_timecode_adjust_ntsc_framenum@LIBAVUTIL_51' /home/root/opencv/2.4.3/build/lib/libavformat.so.54: undefined reference to 'av_timegm@LIBAVUTIL_51 ... (more)