av1parser: Fix data type of film grain param
Fix cb_offset and cr_offset data type from guint8 to guint16. According to spec, cr_offser and cb_offset are 9 bits long, while guint8 can cause an integer overflow, thus changing it to guint16.
Fix cb_offset and cr_offset data type from guint8 to guint16. According to spec, cr_offser and cb_offset are 9 bits long, while guint8 can cause an integer overflow, thus changing it to guint16.