mp4 color/brightness shift and file size optimization

[yellowborb]

Hi ,
Mp4 output are darker than the original pngs by default. But the quality in color gradient is better than gifs and the file is lighter.
This color/brightness shift can be corrected manually with the "-vf eq" command at line 199 after the "-v codec libx264" .
So,for example,if I want +0.2 brightness, the full line 199 will lokk like this :

• f" -bitexact -shortest -vcodec libx264 -vf eq=brightness=1.2 "
  you can also add on the same line "-preset veryslow" ,which sets the encoding speed to the slowest and produce even lighter files. example :
• f" -bitexact -shortest -vcodec libx264 -vf eq=gamma=1.2 -preset veryslow "