Method for assessing the quality of a transmitted video signal sequence at the receiver side, the method comprising the steps of: a) capturing the received input video bit stream prior to decoding and supplying it to a video bit stream analyzer; b) extracting, during a measurement time window, one or more features from the captured packet headers by the bit stream analyzer, without analyzing or decoding the packet payload; c) computing from the one or more features, a single parameter, xwpSEQ, representing an estimate of the spatio-temporal extent of the signal degradation due to packet-loss, wherein the single parameter, xwpSEQ, is based on the number, N, of Group of Pictures, GOPs, in the measurement window and the spatio-temporal extent, xl_k, of the losses occurring in the affected Group of Pictures, k, using the relation xwpSEQ = ∑xl_k / N, wherein the spatio-temporal extent, xl_k, of the losses occurring in a Group of Picture, k, is calculated based on the proportion of impaired pixels in the hit frame due to a loss event, xl_i, the loss location relative to the start of the GOP, t_i and the length of the GOP, T_k, using the relation xl_k = ∑xl_i - ∑xl_i*t_i / T_k, wherein the computing additionally takes into account a correcting factor, α 1,k, representing the spatio-temporal complexity of the video sequence, by which the contribution xl_k of the losses in GOP k to the overall parameter xwpSEQ is corrected, using the relation xwpSEQ = ∑α 1,k ∗ xl_k / N or xwpSEQ = ∑α 1,k ∗ xl_k*T_k / ∑T_k,where N is the number of GOPs in the measurement window and T_k is the length of GOP k; d) supplying the determined parameter to a quality estimation module; and e) calculating, by the quality estimation module, a quality measure due to packet loss, Q trans, based only on the single parameter representing the estimate of the spatio-temporal extent of the signal degradation, xwpSEQ, due to packet-loss and based on video resolution information and employed video codec. a) capturing the received input video bit stream prior to decoding and supplying it to a video bit stream analyzer; b) extracting, during a measurement time window, one or more features from the captured packet headers by the bit stream analyzer, without analyzing or decoding the packet payload; c) computing from the one or more features, a single parameter, xwpSEQ, representing an estimate of the spatio-temporal extent of the signal degradation due to packet-loss, wherein the single parameter, xwpSEQ, is based on the number, N, of Group of Pictures, GOPs, in the measurement window and the spatio-temporal extent, xl_k, of the losses occurring in the affected Group of Pictures, k, using the relation xwpSEQ = ∑xl_k / N, wherein the spatio-temporal extent, xl_k, of the losses occurring in a Group of Picture, k, is calculated based on the proportion of impaired pixels in the hit frame due to a loss event, xl_i, the loss location relative to the start of the GOP, t_i and the length of the GOP, T_k, using the relation xl_k = ∑xl_i - ∑xl_i*t_i / T_k, wherein the computing additionally takes into account a correcting factor, α 1,k, representing the spatio-temporal complexity of the video sequence, by which the contribution xl_k of the losses in GOP k to the overall parameter xwpSEQ is corrected, using the relation xwpSEQ = ∑α 1,k ∗ xl_k / N or xwpSEQ = ∑α 1,k ∗ xl_k*T_k / ∑T_k,where N is the number of GOPs in the measurement window and T_k is the length of GOP k; d) supplying the determined parameter to a quality estimation module; and e) calculating, by the quality estimation module, a quality measure due to packet loss, Q trans, based only on the single parameter representing the estimate of the spatio-temporal extent of the signal degradation, xwpSEQ, due to packet-loss and based on video resolution information and employed video codec.