Could not work for ffmpeg 5.1

[kpld]

Version 1.11.4 could not work for ffmpeg 5.1, has following compile error:

../ffmpeg-5.1/libavutil/tx.c(350): error C2001: newline in constant
../ffmpeg-5.1/libavutil/tx.c(351): error C2143: syntax error: missing ')' before 'else'

[kpld]

ffmpeg 5.1 source code problem, not for this project

[Matthew Oliver]

Added a commit that should hopefully work around this error