A method for encoding an enhancement layer picture in a multi-layer bitstream, comprising: encoding at least one enhancement layer of the multi-layer bitstream based on a first coding scheme, the multi-layer bitstream comprising the at least one enhancement layer and a base layer; determining whether the base layer was coded using a coding scheme that is associated with the first coding scheme, wherein a coding scheme is associated with the first coding scheme only if i) the coding scheme is identical to the first coding scheme or ii) the first coding scheme is a scalable extension of the coding scheme; in response to determining that the base layer was not coded using a coding scheme that is associated with the first coding scheme, (i) encoding a conformance window flag of the base layer in a Video Parameter Set (VPS), the conformance window flag indicating whether the VPS comprises at least one base layer position offset, the at least one base layer position offset indicative of positioning information for the picture, (ii) setting the conformance window flag to a predetermined value, the predetermined value indicating the VPS comprises the at least one base layer position offset, and (iii) encoding the at least one base layer position offset in the VPS; or in response to determining that the base layer was coded using a coding scheme that is associated with the first coding scheme, (i) encoding a conformance window flag for the base layer in a Sequence Parameter Set (SPS), the conformance window flag indicating whether the SPS comprises at least one position offset, the at least one position offset indicative of positioning information for the picture, (ii) setting the conformance window flag to a predetermined value, the predetermined value indicating the SPS comprises the at least one position offset, and (iii) encoding the at least one position offset in the SPS. encoding at least one enhancement layer of the multi-layer bitstream based on a first coding scheme, the multi-layer bitstream comprising the at least one enhancement layer and a base layer; determining whether the base layer was coded using a coding scheme that is associated with the first coding scheme, wherein a coding scheme is associated with the first coding scheme only if i) the coding scheme is identical to the first coding scheme or ii) the first coding scheme is a scalable extension of the coding scheme; in response to determining that the base layer was not coded using a coding scheme that is associated with the first coding scheme, (i) encoding a conformance window flag of the base layer in a Video Parameter Set (VPS), the conformance window flag indicating whether the VPS comprises at least one base layer position offset, the at least one base layer position offset indicative of positioning information for the picture, (ii) setting the conformance window flag to a predetermined value, the predetermined value indicating the VPS comprises the at least one base layer position offset, and (iii) encoding the at least one base layer position offset in the VPS; or in response to determining that the base layer was coded using a coding scheme that is associated with the first coding scheme, (i) encoding a conformance window flag for the base layer in a Sequence Parameter Set (SPS), the conformance window flag indicating whether the SPS comprises at least one position offset, the at least one position offset indicative of positioning information for the picture, (ii) setting the conformance window flag to a predetermined value, the predetermined value indicating the SPS comprises the at least one position offset, and (iii) encoding the at least one position offset in the SPS. <EOS>