Method of filling a mould with a glass gob through an opening of the mould, for forming a glass product in the mould, by using a delivery system for delivering the glass gob to the opening of the mould, the delivery system having an inlet, an outlet, and guiding means for guiding the glass gob through the delivery system, the method including the steps: a) depositing the glass gob in the inlet of the delivery system; b) guiding the glass gob by using the guiding means towards the outlet of the delivery system; c) depositing the glass gob from the outlet of the delivery system in the opening of the mould; d) observing the glass gob, at at least one moment and/or during at least one period after the glass gob has passed the inlet of the delivery system, by using an optical imaging device; and e) determining, based on the observing in step d), a glass gob observation result that includes a glass gob velocity, for predicting, based on at least the glass gob velocity of the glass gob observation result, a glass distribution of the glass product formed in the mould, and/or for controlling, based on at least the glass gob velocity of the glass gob observation result, depositing as in step a), guiding as in step b), and/or depositing as in step c), of a next glass gob that is formed later than the glass gob,, wherein predicting the glass distribution in step e) includes predicting an internal structure and/or an external shape of the glass product formed in the mould,, wherein predicting the internal structure in step e) includes predicting a degree of inclusion of gas in the glass product and/or predicting the external shape in step e) includes predicting a deviation of the external shape of the glass product from a predetermined external shape,, wherein predicting the deviation of the external shape of the glass product from the predetermined external shape is based on a magnitude of the glass gob velocity and wherein predicting the degree of inclusion of gas in the glass product is based on a direction of the glass gob velocity wherein controlling in step e), of guiding as in step b) of the next glass gob includes adjusting lubrication of the guiding means; and wherein controlling in step e), of depositing as in step a) of the next glass gob includes adjusting a mutual position difference of the inlet and a formation position at which the glass gob is formed and/or adjusting air supply to an accelerator for the next glass gob, which accelerator is positioned before the inlet; and wherein controlling in step e), of depositing as in step c) of the next glass gob includes adjusting a mutual position difference of the outlet and the opening of the mould. a) depositing the glass gob in the inlet of the delivery system; b) guiding the glass gob by using the guiding means towards the outlet of the delivery system; c) depositing the glass gob from the outlet of the delivery system in the opening of the mould; d) observing the glass gob, at at least one moment and/or during at least one period after the glass gob has passed the inlet of the delivery system, by using an optical imaging device; and e) determining, based on the observing in step d), a glass gob observation result that includes a glass gob velocity, for predicting, based on at least the glass gob velocity of the glass gob observation result, a glass distribution of the glass product formed in the mould, and/or for controlling, based on at least the glass gob velocity of the glass gob observation result, depositing as in step a), guiding as in step b), and/or depositing as in step c), of a next glass gob that is formed later than the glass gob,, wherein predicting the glass distribution in step e) includes predicting an internal structure and/or an external shape of the glass product formed in the mould,, wherein predicting the internal structure in step e) includes predicting a degree of inclusion of gas in the glass product and/or predicting the external shape in step e) includes predicting a deviation of the external shape of the glass product from a predetermined external shape,, wherein predicting the deviation of the external shape of the glass product from the predetermined external shape is based on a magnitude of the glass gob velocity and wherein predicting the degree of inclusion of gas in the glass product is based on a direction of the glass gob velocity wherein controlling in step e), of guiding as in step b) of the next glass gob includes adjusting lubrication of the guiding means; and wherein controlling in step e), of depositing as in step a) of the next glass gob includes adjusting a mutual position difference of the inlet and a formation position at which the glass gob is formed and/or adjusting air supply to an accelerator for the next glass gob, which accelerator is positioned before the inlet; and wherein controlling in step e), of depositing as in step c) of the next glass gob includes adjusting a mutual position difference of the outlet and the opening of the mould.