No longer builds on new versions of ffmpeg: 'AVStream' has no member 'codec'

[enn-nafnlaus]

running install_lib
running build_py
running build_ext
building 'butterflow.avinfo' extension
gcc -fno-strict-aliasing -O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -D_GNU_SOURCE -fPIC -fwrapv -DNDEBUG -O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -D_GNU_SOURCE -fPIC -fwrapv -fPIC -I/usr/include/python2.7 -c /home/stablediffusion/butterflow/butterflow/avinfo.c -o build/temp.linux-x86_64-2.7/home/stablediffusion/butterflow/butterflow/avinfo.o -std=c11 -Wno-unused-variable -Wno-unused-function -Wno-cpp
/home/stablediffusion/butterflow/butterflow/avinfo.c: In function ‘get_av_info’:
/home/stablediffusion/butterflow/butterflow/avinfo.c:32:5: warning: implicit declaration of function ‘av_register_all’ [-Wimplicit-function-declaration]
32 | av_register_all();
| ^~~~~~~~~~~~~~~
/home/stablediffusion/butterflow/butterflow/avinfo.c:103:72: error: ‘AVStream’ has no member named ‘codec’
103 | AVCodecContext *v_codec_ctx = format_ctx->streams[v_stream_idx]->codec;
| ^~
error: command 'gcc' failed with exit status 1

This is ffmpeg 5.0.2.

(Another minor issue came up in that it was looking for its include directories in <dirname/filename.h> but on my system they're in <ffmpeg/dirname/filename.h>... easily fixed by symlinks)