13:38:59 **** Build of configuration Debug for project ffmpeg-examples ****
make all
Building file: ../encode_video.c
Invoking: Cross GCC Compiler
gcc -I"C:\portable\ffmpeg-4.2.1-win64-dev\include" -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"encode_video.d" -MT"encode_video.o" -o "encode_video.o" "../encode_video.c"
Finished building: ../encode_video.c

Building target: ffmpeg-examples
Invoking: Cross GCC Linker
gcc -L"C:\portable\ffmpeg-4.2.1-win64-dev\lib" -o "ffmpeg-examples"  ./encode_video.o   -lavformat -lavutil -lavcodec -lavfilter
c:/portable/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../../mingw32/bin/ld.exe: ./encode_video.o: in function `av_make_error_string':
C:/portable/ffmpeg-4.2.1-win64-dev/include/libavutil/error.h:111: undefined reference to `av_strerror'
c:/portable/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../../mingw32/bin/ld.exe: ./encode_video.o: in function `encode':
C:\projects\3rd-party\ffmpeg-examples\Debug/../encode_video.c:40: undefined reference to `avcodec_send_frame'
c:/portable/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../../mingw32/bin/ld.exe: C:\projects\3rd-party\ffmpeg-examples\Debug/../encode_video.c:46: undefined reference to `avcodec_receive_packet'
c:/portable/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../../mingw32/bin/ld.exe: C:\projects\3rd-party\ffmpeg-examples\Debug/../encode_video.c:55: undefined reference to `av_packet_unref'
c:/portable/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../../mingw32/bin/ld.exe: ./encode_video.o: in function `main':
C:\projects\3rd-party\ffmpeg-examples\Debug/../encode_video.c:75: undefined reference to `avcodec_find_encoder_by_name'
c:/portable/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../../mingw32/bin/ld.exe: C:\projects\3rd-party\ffmpeg-examples\Debug/../encode_video.c:80: undefined reference to `avcodec_alloc_context3'
c:/portable/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../../mingw32/bin/ld.exe: C:\projects\3rd-party\ffmpeg-examples\Debug/../encode_video.c:85: undefined reference to `av_packet_alloc'
c:/portable/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../../mingw32/bin/ld.exe: C:\projects\3rd-party\ffmpeg-examples\Debug/../encode_video.c:106: undefined reference to `av_opt_set'
c:/portable/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../../mingw32/bin/ld.exe: C:\projects\3rd-party\ffmpeg-examples\Debug/../encode_video.c:108: undefined reference to `avcodec_open2'
c:/portable/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../../mingw32/bin/ld.exe: C:\projects\3rd-party\ffmpeg-examples\Debug/../encode_video.c:118: undefined reference to `av_frame_alloc'
c:/portable/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../../mingw32/bin/ld.exe: C:\projects\3rd-party\ffmpeg-examples\Debug/../encode_video.c:126: undefined reference to `av_frame_get_buffer'
c:/portable/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../../mingw32/bin/ld.exe: C:\projects\3rd-party\ffmpeg-examples\Debug/../encode_video.c:135: undefined reference to `av_frame_make_writable'
c:/portable/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../../mingw32/bin/ld.exe: C:\projects\3rd-party\ffmpeg-examples\Debug/../encode_video.c:162: undefined reference to `avcodec_free_context'
c:/portable/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../../mingw32/bin/ld.exe: C:\projects\3rd-party\ffmpeg-examples\Debug/../encode_video.c:163: undefined reference to `av_frame_free'
c:/portable/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../../mingw32/bin/ld.exe: C:\projects\3rd-party\ffmpeg-examples\Debug/../encode_video.c:164: undefined reference to `av_packet_free'
collect2.exe: error: ld returned 1 exit status
make: *** [ffmpeg-examples] Error 1
"make all" terminated with exit code 2. Build might be incomplete.

13:39:00 Build Failed. 19 errors, 0 warnings. (took 899ms)