Is there a way to get a + sign for positive values, when using Ffmpeg to adjust gain it doesn't work without them.

[simcc]

For example, using "ffmpeg -i input.mp4 -c:v copy -af volume=replaygain=track output.mp4" if the track gain is 31.43, as it comes out of loudgain, nothing happens, whereas, if I open up the file in Mp3tag etc. and add in a + sign in front of the 31.43 (+31.43), it then works.