Coding concept allowing parallel processing, transport demultiplexer and video bitstream

An encoder configured to encode a picture of a video, the encoder comprising:

• a residual determiner configured to determine a residual signal associated with the picture based on a prediction signal;
• and
• an entropy encoder configured to encode the residual signal associated with the picture into a data stream using CABAC entropy encoding, wherein a row of the picture as encoded is represented in a wavefront parallel processing (WPP) substream having at least two tranches, each of the at least two tranches having a header indicating a boundary of the respective tranche and including a flag that affects CABAC probability adaptation in CABAC entropy encoding of the respective tranche within the WPP substream,
• the entropy encoder being configured to entropy encode a current tranche of the at least two using CABAC entropy encoding including (a) responsive to the current tranche starting at a beginning of the WPP substream and the flag within the header of the current tranche having a first binary value, resetting the CABAC probability adaptation for the current tranche, and (b) responsive to the current tranche not starting at the beginning of the WPP substream and the flag within the header of the current tranche having a second binary value, using a CABAC probability of a previous tranche in the at least two tranches, obtained during entropy encoding of the previous tranche across the boundary between the at least two tranches for entropy encoding of the current tranche.

A non-transitory computer-readable medium for storing information related to an encoded picture of a video, comprising instructions, which when executed by a processor, causes generation of:

• a data stream stored in the non-transitory computer-readable medium, the data stream comprising encoded information related to a residual signal associated with a picture of a video, wherein the residual signal is determined based on a prediction signal, and is entropy-decoded using context adaptive binary arithmetic coding (CABAC) entropy decoding, wherein a row of the encoded picture is represented in a wavefront parallel processing (WPP) substream having at least two tranches, each of the at least two tranches having a header indicating a boundary of the respective tranche and including a flag that affects CABAC probability adaptation in CABAC entropy decoding of the respective tranche within the WPP substream,
• wherein, a current tranche of the at least two tranches are entropy- decoded using the CABAC entropy decoding including (a) responsive to the current tranche starting at a beginning of the WPP substream and the flag within the header of the current tranche having a first binary value, resetting the CABAC probability adaptation for the current tranche, and (b) responsive to the current tranche not starting at the beginning of the WPP substream and the flag within the header of the current tranche having a second binary value, using a CABAC probability of a previous tranche in the at least two tranches, obtained during entropy decoding of the previous tranche across the boundary between the at least two tranches for entropy decoding of the current tranche.

A method for decoding data representing an encoded picture of a video, the method comprising:

• entropy decoding data representing the encoded picture using context adaptive binary arithmetic coding (CABAC) entropy decoding to obtain a residual signal associated with the picture, wherein a row of the encoded picture is represented in a wavefront parallel processing (WPP) substream having at least two tranches, each of the at least two tranches having a header indicating a boundary of the respective tranche and second tranches and including a flag that affects CABAC probability adaptation in CABAC entropy decoding of the respective tranche within the WPP substream,
• wherein the entropy decoding the a current tranche of the at least two tranches using CABAC entropy decoding includes (a) responsive to the current tranche starting at a beginning of the WPP substream and the flag within the header of the current tranche having a first binary value, resetting the CABAC probability adaptation for the current tranche, and (b) responsive to the current tranche not starting at the beginning of the WPP substream and the flag within the header of the current tranche having a second binary value, using a CABAC probability of a previous tranche in the at least two tranches, obtained during entropy decoding of the previous tranche across the boundary between the at least two tranches for entropy decoding of the current tranche;
• and
• combining the residual signal and a prediction signal to reconstruct the picture.