I see several different things there, but the most common are some smooth seeds, looks almost like pine seeds, but I know these are not pine seeds.
The small green, irregularly shaped things are "stone", most likely composed from bile cholesteroles.
There are some fibers and some other seeds there.
If you cut the "seeds" with knife, it would help know what it is.
If you make a list of everything you ate in the last 14 days ... you may find what those seeds are.