SER image sequences
SER file format is a simple image sequence format, similar to uncompressed films. Documentation can be found on the official page.
Now SER handles colour images, which makes it perfect as replacement for the usual AVI or other film format produced by older capture programs in all astronomy situations. Compressed images should not be used for astronomy.
The main issue with AVI and other film containers is that it is designed to work with many codecs and pixel formats, which it good for general purpose films, but requires astronomy software to handle a large array of actually different file formats. General purpose film software are often not well equipped to handle 16-bit per pixel values or some uncompressed data formats. With SER, only one file format handles it all, that's why Siril for example is now developing processing only for SER.