Patent ID: 8638848

Claim:
A method of transmitting a video stream over a network between a transmission device and at least one reception device, comprising: a step of encoding primary video data of the video stream according to a first type of encoding; a step of obtaining secondary video data of said video stream, dependent on the encoded primary data, comprising obtaining at least one degraded version of reconstructed encoded primary video data by the simulation of packet losses potentially suffered by packets transporting the encoded primary video data and at least one method of masking losses due to packet losses able to be implemented by a reception device able to decode the primary video data encoded according to the first type of encoding, wherein the simulation of packet losses and loss masking comprises applying a loss masking process during the reconstruction of encoded primary video data contained in lost packets to generate the at least one degraded version of the reconstructed encoded primary video data; a step of encoding a difference calculated during the step of obtaining secondary video data according to a second type of encoding different from the first type of encoding to obtain encoded secondary video data; and a step of transmitting, by means of the network, primary video data encoded according to the first type of encoding and at least some of the secondary video data encoded with the second type of encoding, wherein, during the step of obtaining secondary video data, the difference is calculated between the images corresponding to said at least one degraded version of the reconstructed encoded primary video data and the temporally corresponding images resulting from decoding of lossless encoded primary video data.