Method for checking that an ID is valid for the given #GESExtractable
type. If the given ID is considered valid, it can be adjusted into some
standard and returned to prevent the creation of separate #GESAsset-s,
with different #GESAsset:id, that would otherwise act the same.
Returns (transfer full) (nullable): The actual #GESAsset:id to set on
any corresponding assets, based on id, or %NULL if id is not valid.
Method for checking that an ID is valid for the given #GESExtractable type. If the given ID is considered valid, it can be adjusted into some standard and returned to prevent the creation of separate #GESAsset-s, with different #GESAsset:id, that would otherwise act the same.
Returns (transfer full) (nullable): The actual #GESAsset:id to set on any corresponding assets, based on
id,or %NULL ifidis not valid.