JVET-AL0130 AHG9: Source picture timing for interlaced video with SPTI SEI message [J. Lee, H. Tan, J. Nam, C. Kim, J. Lim, S. Kim (LGE)]
Chaired by J. Boyce at 1548 on 1 April 2025.
This contribution proposes modifications that are asserted to provide improvement in handling source picture timing of an interlaced video with SPTI SEI message. The proposed modifications are as follows:
- Apply SPTI SEI message only to non-duplicated pictures in an interlaced video.
- Apply SPTI SEI message to top field and bottom field separately when a picture corresponds to a field.
It was remarked that SPTI SEI will be included in AVC and HEVC.
It was suggested that the most relevant use case for interlace content where the proposal would have an impact is for telecine. It was further suggested that use of the SPTI SEI is unnecessary for that use case because the source picture timing would already be known.
Slow motion content broadcast in interlace was also suggested as a use case that would be addressed by the contribution.
It was suggested the UK and France are still broadcasting in interlace for HD content.
It was questioned if there is any impact of top field first vs bottom field first.
Decision: Adopt to VSEI v4 and coding spec interfaces.
JVET-AL0130 AHG9: Source picture timing for interlaced video with SPTI SEI message