Comment 30 for bug 1076928

The relevant part of the build log is:

audacity-FFmpeg.o: In function `import_ffmpeg_decode_frame(_streamContext*,
bool)':
/home/gale/audacity/src/FFmpeg.cpp:364: undefined reference to `av_frame_alloc'
/home/gale/audacity/src/FFmpeg.cpp:414: undefined reference to `av_frame_free'
export/audacity-ExportFFmpeg.o: In function `encode_audio':
/home/gale/audacity/src/export/ExportFFmpeg.cpp:520: undefined reference to
`av_frame_alloc'
/home/gale/audacity/src/export/ExportFFmpeg.cpp:592: undefined reference to
`av_frame_free'
export/audacity-ExportFFmpegDialogs.o: In function
`ExportFFmpegOptions::FetchCodecList()':
/home/gale/audacity/src/export/ExportFFmpegDialogs.cpp:1281: undefined
reference to `av_codec_is_encoder'

I failed to reproduce the build failure. My guess is that the header files used
mismatch with the avcodec library that should be linked against. What FFmpeg
libraries do you have installed and where? Can you run these commands to shed
some light on it?

find /usr/ -name avcodec.h
find /usr/ /lib -name 'libavcodec*.so*'
grep -H av_codec_is_encoder $(find /usr/ -name avcodec.h)