A method of retrieving media data, the method comprising: receiving, from a server device, a manifest file comprising information indicating which type of a plurality of types media segments included in a representation (68A-N) of a media content conform to, wherein the plurality of types of media segments includes: a delivery unit media segment format, wherein a media segment conforming to the delivery unit media segment format contains one or more whole self-contained movie fragments; a random access media segment format, wherein a media segment conforming to the random access media segment format conforms to the delivery unit media segment format, and wherein the first access unit in each of the movie fragments in the segment is an I SAU of an ISO base media file format stream access point, SAP, of type 1, 2, or 3; a no overlap media segment format, wherein a media segment conforming to the no overlap media segment format conforms to the delivery unit media segment format and does not overlap starting and ending times of other segments in the representation (68A-N) and other segments in other representations (68A-N) in an adaptation set including the representation (68A-N); and a switching media segment format, wherein a media segment conforming to the switching media segment format conforms to the random access media segment format, and wherein the first sample of the first movie fragment is an I SAU of an ISO based media file format stream access point, SAP, of type 1 or 2; determining, from said information, which type of the plurality of types media segments included in the representation (68A-B) of the media content conform to; and using said determined type to retrieve (334, 340) media segments of said media content stream from the server device. receiving, from a server device, a manifest file comprising information indicating which type of a plurality of types media segments included in a representation (68A-N) of a media content conform to, wherein the plurality of types of media segments includes: a delivery unit media segment format, wherein a media segment conforming to the delivery unit media segment format contains one or more whole self-contained movie fragments; a random access media segment format, wherein a media segment conforming to the random access media segment format conforms to the delivery unit media segment format, and wherein the first access unit in each of the movie fragments in the segment is an I SAU of an ISO base media file format stream access point, SAP, of type 1, 2, or 3; a no overlap media segment format, wherein a media segment conforming to the no overlap media segment format conforms to the delivery unit media segment format and does not overlap starting and ending times of other segments in the representation (68A-N) and other segments in other representations (68A-N) in an adaptation set including the representation (68A-N); and a switching media segment format, wherein a media segment conforming to the switching media segment format conforms to the random access media segment format, and wherein the first sample of the first movie fragment is an I SAU of an ISO based media file format stream access point, SAP, of type 1 or 2; a delivery unit media segment format, wherein a media segment conforming to the delivery unit media segment format contains one or more whole self-contained movie fragments; a random access media segment format, wherein a media segment conforming to the random access media segment format conforms to the delivery unit media segment format, and wherein the first access unit in each of the movie fragments in the segment is an I SAU of an ISO base media file format stream access point, SAP, of type 1, 2, or 3; a no overlap media segment format, wherein a media segment conforming to the no overlap media segment format conforms to the delivery unit media segment format and does not overlap starting and ending times of other segments in the representation (68A-N) and other segments in other representations (68A-N) in an adaptation set including the representation (68A-N); and a switching media segment format, wherein a media segment conforming to the switching media segment format conforms to the random access media segment format, and wherein the first sample of the first movie fragment is an I SAU of an ISO based media file format stream access point, SAP, of type 1 or 2; determining, from said information, which type of the plurality of types media segments included in the representation (68A-B) of the media content conform to; and using said determined type to retrieve (334, 340) media segments of said media content stream from the server device.