I think is not a bug. FMF format was done with the idea of recording the spectrum output with spectrum time view (and not what you see). That allows to accelerate the emulation or record from a RZX without waiting the real time. Maybe there is a way to accomplish what you need with a video editing software.
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
attaching test program and video
video
fmfconv plot.fmf -C 0:00-1:00 | ffmpeg -y -i - -c:v h264 -pix_fmt yuv420p -r 30 -t 2:20 -vf "pad=ceil(iw/2)*2:ceil(ih/2)*2" -b:v 5M -acodec aac -ar 44100 -ac 2 plot.mp4my convert line
Last edit: Mariano DM 2023-05-27
I think is not a bug. FMF format was done with the idea of recording the spectrum output with spectrum time view (and not what you see). That allows to accelerate the emulation or record from a RZX without waiting the real time. Maybe there is a way to accomplish what you need with a video editing software.