Method for delivering an audio and/or video content and transcoding proxy implementing said method

A method for delivering an audio and/or video A/V content to a client device using adaptive streaming by an A/V content delivery system, the A/V content comprising a primary A/V content and a secondary A/V content to be inserted in the primary A/V content, the primary A/V content and the secondary A/V content being in a form of segments, the method being implemented by a transcoding proxy of the A/V content delivery system, wherein the method comprises:

• receiving a first request for preparing to transcode segments of the secondary A/V content, when the segments of the secondary A/V content have different duration than a typical duration of the segments of the primary A/V content, the first request including locator information about an original secondary A/V content manifest along with configuration parameters, said configuration parameters comprising the typical duration of the segments of the primary A/V content;
• obtaining said original secondary A/V content manifest using the locator information about the original secondary A/V content manifest, which describes an original secondary A/V content segments timeline and at least one available representation of original secondary A/V content associated with said original secondary A/V content segments timeline;
• rewriting said original secondary A/V content manifest, so as to obtain a rewritten secondary A/V content manifest, by indicating, in a part thereof intended to be reused by the client device to request segments of the secondary A/V content, that transcoding is requested as well as the typical duration of the segments of the primary A/V content, and by modifying the description of said at least one representation so as to match a rewritten timeline obtained by rewriting the original secondary A/V content segments timeline responsive to the received configuration parameters so that the rewritten segment timeline is aligned on the typical duration of the segments of the primary A/V content;
• transmitting the rewritten secondary A/V content manifest in response to the first request;
• and when receiving a second request for at least one segment of the secondary A/V content according to the rewritten secondary A/V content manifest, instructing a transcoder to perform transcoding operations so as to obtain, and further transmit in response to the second request, segments of the secondary A/V content according to the rewritten timeline.