Method and server for audio and/or video content delivery

A cache server configured for delivering an audio and/or video content using adaptive streaming to a client device, the audio and/or video content being segmented into data segments available in various representations with respective audio and/or video qualities, the representations being time-aligned per segment, the segments being further divided into chunks,

• wherein the cache server comprises electronic circuitry configured for:
• obtaining a round-trip time value applicable between the cache server and the client device;
• computing a minimum bulk transfer size mTBS from the maximum average bitrate of the various representations of the audio and/or video content and from the obtained round-trip time value;
• computing a minimum bulk duration mTBDi, with respect to the audio and/or video content, for the representation i of the audio and/or video content which has to be delivered to the client device;
• and
• delivering the audio and/or video content by burst transfers in the form of L bulks of at least one chunk or aggregated successive chunks for each segment, the L bulks containing jointly audio and/or video content data corresponding to said segment,
• and wherein, for each segment, at least L−1 bulk or bulks are respectively formed by M chunk or chunks such that
• ∑
• j
• =
• 1
• M
• C
• ⁢
• H
• j
• >
• mTBDi
• and
• ∑
• j
• =
• 1
• M
• -
• 1
• C
• ⁢
• H
• j
• ≤
• m
• ⁢
• TBDi
• wherein CH1 (j=1, . . . ,M) represents the time duration of the chunk j with respect to the audio and/or video content.