Offline spectrogram rendering to a video file

[unfa]

I guess it could be useful as some point to be able to render a spectrograph to a video file based on an audio file input. The original audio file could be muxed with the video.

Being able to select an arbitrary image resolution for potentially very high detail would be great.

Also a custom FPS (usually 30 or 60 FPS).

I could use this in videos to generate nice spectrographs in post-production to show users what a sound looks like in a video.

This is obviously a very low priority function, as it can (somewhow) be just worked around by recording a video from the spectrogram window (though the screen resolution is limiting the detail then).