The invention relates to a decoder, system and method for decoding multimedia data in a terminal by managing the energy available for decoding, including a decoder (300, 500) of the multimedia data, characterised in that said decoder (300, 500) includes at least one low-power decoding chain comprising an activation module (305, 520) suitable for activating a first low-power decoding chain or loop filter (509, 510, 511) and a low-power interpolation chain (535, 536, 537) in accordance with at least one parameter representing energy constraints of the user and/or of the mobile terminal and one or more metadata Md associated with a decoding complexity and/or with a decoding energy. The invention can be used in a terminal using the H.264/AVC or H.265/HEVC standards.