Enhanced block-request streaming system using signaling or block creation

A method, in a client device that is capable of presenting a media presentation over a presentation time period, of determining requests to make of a media server, the method comprising:

• obtaining, at the client device, a list of segments of the media presentation, wherein the client device is configured to transmit a request for a segment, wherein the segment includes a plurality of blocks, and wherein each block includes a plurality of frames;
• determining, at the client device, a desired time period of the media presentation, wherein the desired time period is less than all of the presentation time period;
• obtaining, at the client device, stored correspondence data that includes a correspondence between at least one time indicator and at least one data range of a block within a segment of the media presentation;
• determining, at the client device, and from the stored correspondence data, a position of at least one block within the segment to include in a request for the at least one block from the media server;
• transmitting the request for the at least one block;
• and
• presenting the media presentation.