Concept for picture/video data streams allowing efficient reducibility or efficient random access

Video data stream stored in a storing medium representing a video comprising

• a parameter set portion indicating coding parameter settings;
• a payload portion into which pictures of the video are coded in a manner parameterized using a first set of the coding parameter settings, the first set being indexed by indices comprised by the payload portion,
• wherein the video data stream comprises an information comprising
• an indication of a predetermined subarea of the pictures, and
• replacement indices for redirecting the indices comprised by the payload portion so as to refer to, and/or replacement parameters for adjusting the first set of coding parameter settings so as to result in, a second set of coding parameter settings,
• wherein the second set of coding parameters are selected so that a reduced video data stream modified compared to the video data stream by
• removing portions of the payload portion referring to an area of the pictures outside the predetermined subarea, and
• changing location indications in the payload portion so to indicate a location in a manner measured from a circumference of the predetermined subarea instead of the pictures,
• comprises a reduced payload portion having encoded thereinto subarea-specific pictures showing the predetermined subarea of the pictures in a manner parameterized using the second set of coding parameter settings,
• wherein the video data stream and the reduced video data stream are conforming to HEVC, and
• wherein the information is comprised in a SEI message, a VUI or a parameter set extension.

Encoder for encoding a video into a video data stream, comprising

• a parameter setter configured to determine coding parameter settings and generate a parameter set portion of the video data stream indicating the coding parameter settings;
• a coding core configured to encode pictures of the video into a payload portion of the video data stream in a manner parameterized using a first set of the coding parameter settings, the first set being indexed by indices comprised by the payload portion,
• wherein the encoder is configured to provide the video data stream with an information comprising
• an indication of a predetermined subarea of the pictures, and
• replacement indices for redirecting the indices comprised by the payload portion so as to refer to, and/or replacement parameters for adjusting the first set of coding parameter settings so as to result in, a second set of coding parameter settings,
• wherein the second set of coding parameters are selected so that a reduced video data stream modified compared to the video data stream by
• removing portions of the payload portion referring to an area of the pictures outside the predetermined subarea, and
• changing location indications in the payload portion so to indicate a location in a manner measured from a circumference of the predetermined subarea instead of the pictures,
• comprises a reduced payload portion having encoded thereinto subarea-specific pictures showing the subarea of the pictures in a manner parameterized using the second set of coding parameter settings,
• wherein the video data stream and the reduced video data stream are conforming to HEVC, and
• wherein the encoder is configured to insert the information into a SEI message, a VUI or an parameter set extension.

Device for processing a video data stream so as to be forwarded to a video decoder, the video data stream comprising

• a parameter set portion indicating coding parameter settings;
• a payload portion into which pictures of the video are coded in a manner parameterized using a first set of the coding parameter settings, the first set being indexed by indices comprised by the payload portion,
• wherein the device is configured to
• read from the video data stream an information comprising
• an indication of a predetermined subarea of the pictures, and
• replacement indices for redirecting the indices comprised by the payload portion so as to refer to, and/or replacement parameters for adjusting the first set of coding parameter settings so as to result in, a second set of coding parameter settings,
• reduce the video data stream to a reduced video data stream modified by
• performing the redirection and/or adjustment so that the second set of coding parameter settings is indexed by the payload portion's indices;
• removing portions of the payload portion referring to an area of the pictures outside the predetermined subarea, and
• changing location indications in the payload portion so to indicate a location measured from a circumference of the predetermined subarea instead of the pictures,
• so that the reduced video data stream comprises a reduced payload portion which has encoded thereinto subarea-specific pictures showing the predetermined subarea of the pictures in a manner parameterized using the second set of coding parameter settings,
• wherein the video data stream and the reduced video data stream are conforming to HEVC, and
• wherein the device is configured to read the information from a SEI message, a VUI or an parameter set extension of the video data stream.

Method for encoding a video into a video data stream, comprising

• determining coding parameter settings and generate a parameter set portion of the video data stream indicating the coding parameter settings;
• encoding pictures of the video into a payload portion of the video data stream in a manner parameterized using a first set of the coding parameter settings, the first set being indexed by indices comprised by the payload portion,
• providing the video data stream with an information comprising
• an indication of a predetermined subarea of the pictures, and
• replacement indices for redirecting the indices comprised by the payload portion so as to refer to, and/or replacement parameters for adjusting the first set of coding parameter settings so as to result in, a second set of coding parameter settings,
• wherein the second set of coding parameters are selected so that a reduced video data stream modified compared to the video data stream by
• removing portions of the payload portion referring to an area of the pictures outside the predetermined subarea, and
• changing location indications in the payload portion so to indicate a location in a manner measured from a circumference of the predetermined subarea instead of the pictures,
• comprises a reduced payload portion having encoded thereinto subarea-specific pictures showing the subarea of the pictures in a manner parameterized using the second set of coding parameter settings.
• wherein the video data stream and the reduced video data stream are conforming to HEVC, and
• wherein the information is inserted into a SEI message, a VUI or an parameter set extension.

Method for processing a video data stream, the video data stream comprising

• a parameter set portion indicating coding parameter settings;
• a payload portion into which pictures of the video are coded in a manner parameterized using a first set of the coding parameter settings, the first set being indexed by indices comprised by the payload portion,
• wherein the method comprising
• reading from the video data stream an information comprising
• an indication of a predetermined subarea of the pictures, and
• replacement indices for redirecting the indices comprised by the payload portion so as to refer to, and/or replacement parameters for adjusting the first set of coding parameter settings so as to result in, a second set of coding parameter settings,
• reducing the video data stream to a reduced video data stream modified by
• performing the redirection and/or adjustment so that the second set of coding parameter settings is indexed by the payload portion's indices;
• removing portions of the payload portion referring to an area of the pictures outside the predetermined subarea, and
• changing location indications in the payload portion so to indicate a location measured from a circumference of the predetermined subarea instead of the pictures,
• so that the reduced video data stream comprises a reduced payload portion which has encoded thereinto subarea-specific pictures showing the predetermined subarea of the pictures in a manner parameterized using the second set of coding parameter settings,
• wherein the video data stream and the reduced video data stream are conforming to HEVC, and
• wherein the information is read from a SEI message, a VUI or an parameter set extension of the video data stream.

A method for processing a video, the method comprising

• receiving a data stream into which a picture of a video is coded, and
• reading, as part of displacing information in the data stream, read, as part the displacing information, from the data stream
• a count of predetermined subregions within the picture,
• size parameters defining a size of a target picture area, the target picture area representing a cubic projection of the panoramic scene,
• for each predetermined subregion of the predetermined subregions of the picture,
• a width, a height, a top sample row and a left-most sample column of the respective predetermined subregion in the target region and
• a further width, a further height, a further top sample row and a further left-most sample column of the respective predetermined region within the picture, and
• wherein the displacing information allows for
• deriving the target picture area from the picture by
• displacing each of the predetermined subregions of the picture according to the width, the height, the top sample row and the left-most sample column of the respective predetermined subregion of the picture within the target picture and the further width, the further height, the further top sample row and the further left-most sample column of the respective predetermined subregion of the picture within the picture, as read for the respective predetermined subregion, and
• filling, according to default filling information comprised in the data stream, a portion of the target picture area where none of the predetermined subregions of the picture is displaced to according to the displacing information.