Methods, encoders (110) and decoders (120) for encoding frames of a video sequence into an encoded representation of the video sequence are disclosed. The encoder (110) encodes (203) frames into a first set of encoded units, while specifying at least one residual parameter in one or more of the first set of encoded units. The encoder (110) encodes (204) frames into a second set of encoded units, while refraining from specifying the at least one residual parameter. The encoder (110) encodes (203) frames into a first set of encoded units, wherein each frame has a first level of fidelity. The encoder (110) encodes (204) frames into a second set of encoded units, wherein each frame has a second level of fidelity, wherein the second level is less than the first level. The decoder (120) decodes (212, 213), while obtaining a first or a second level of fidelity for each frame. When the second level is less than the first level, the decoder (120) enhances (216) a second set of frames towards obtaining the first level of fidelity for each frame of the second set. Corresponding computer programs and carriers therefor are also disclosed.
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