Error in building opencv with ffmpeg
My solution is to grep the missing defines (2 in total) from FFmpeg by using grep -r which leads to the following code found in libavcodec/avcodec.h:
#define AV_CODEC_FLAG_GLOBAL_HEADER (1 << 22)
#define CODEC_FLAG_GLOBAL_HEADER AV_CODEC_FLAG_GLOBAL_HEADER
#define AVFMT_RAWPICTURE 0x0020
Copy and paste it to the top of:
opencv-3.3.0/modules/videoio/src/cap_ffmpeg_impl.hpp
Compile and everything works even with the latest sources
Easiest change for the CODEC_FLAG_GLOBAL_HEADER is to change it to AV_CODEC_FLAG_GLOBAL_HEADER, it was redefined in a newer version.
Note the "AV_" in front