Some function is undefined?

[mikeyan123]

./transcoder.go:114: codecCtx.CopyTo undefined (type *avcodec.Context has no field or method CopyTo)
./transcoder.go:224: ctx.encCodec.CopyTo undefined (type *avcodec.Context has no field or method CopyTo)
./transcoder.go:257: ctx.decCodec.DecodeVideo undefined (type *avcodec.Context has no field or method DecodeVideo)
./transcoder.go:315: ctx.encCodec.EncodeVideo undefined (type *avcodec.Context has no field or method EncodeVideo)

[quiznilo1]

I'm getting the same 4 errors when trying to build the example.

Go version: 1.9.1 64-bit
Go-libav branch: master
Build tags: 3.3

ffmpeg version 3.3.4 Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 5.4.0 (Funtoo 5.4.0)
  configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --docdir=/usr/share/doc/ffmpeg-3.3.4/html --mandir=/usr/share/man --enable-shared --cc=x86_64-pc-linux-gnu-gcc --cxx=x86_64-pc-linux-gnu-g++ --ar=x86_64-pc-linux-gnu-ar --optflags='-march=broadwell -O2 -pipe' --disable-static --enable-avfilter --enable-avresample --disable-stripping --disable-indev=oss --disable-indev=jack --disable-outdev=oss --enable-version3 --enable-bzlib --disable-runtime-cpudetect --disable-debug --disable-gcrypt --disable-gnutls --disable-gmp --enable-gpl --enable-hardcoded-tables --enable-iconv --disable-lzma --enable-network --disable-openssl --enable-postproc --disable-libsmbclient --enable-ffplay --enable-sdl2 --enable-vaapi --enable-vdpau --enable-xlib --enable-libxcb --enable-libxcb-shm --enable-libxcb-xfixes --enable-zlib --enable-libcdio --disable-libiec61883 --enable-libdc1394 --disable-libcaca --disable-openal --enable-opengl --disable-libv4l2 --enable-libpulse --enable-libopencore-amrwb --enable-libopencore-amrnb --disable-libfdk-aac --enable-libopenjpeg --enable-libbluray --enable-libcelt --disable-libgme --disable-libgsm --disable-mmal --disable-libmodplug --enable-libopus --disable-libilbc --disable-librtmp --disable-libssh --disable-libschroedinger --disable-libspeex --enable-libvorbis --enable-libvpx --disable-libzvbi --disable-libbs2b --disable-chromaprint --disable-libflite --enable-frei0r --disable-libfribidi --enable-fontconfig --disable-ladspa --enable-libass --enable-libfreetype --disable-librubberband --disable-netcdf --disable-libzmq --disable-libzimg --disable-libsoxr --enable-pthreads --disable-libvo-amrwbenc --enable-libmp3lame --disable-libkvazaar --enable-nvenc --disable-libopenh264 --disable-libsnappy --enable-libtheora --enable-libtwolame --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --disable-amd3dnow --disable-amd3dnowext --disable-fma4 --disable-xop --cpu=broadwell --disable-doc --disable-htmlpages --enable-manpages
  libavutil      55. 58.100 / 55. 58.100
  libavcodec     57. 89.100 / 57. 89.100
  libavformat    57. 71.100 / 57. 71.100
  libavdevice    57.  6.100 / 57.  6.100
  libavfilter     6. 82.100 /  6. 82.100
  libavresample   3.  5.  0 /  3.  5.  0
  libswscale      4.  6.100 /  4.  6.100
  libswresample   2.  7.100 /  2.  7.100
  libpostproc    54.  5.100 / 54.  5.100

[ddnn55]

Same errors.

[songheng45]

use build tags @gimlids @quiznilo1