I am using your software regularly at it works great. Most of it is for astronomy showing time-lapse of the stars and satellites over many hours.
I take the original images as jpg so the frame info works well as a time stamp.
Many astronomers use the FITS format. However when converting these to PNG or JPG the file creation date is lost at the frame inform time stamp is incorrect.
If you could consider adding support for FITS files that would be great.