Opened 4 years ago
Closed 4 years ago
#928 closed defect (fixed)
VTM 8.0 issue for running RPR with ScalingRatioHor/Ver < 1
| Reported by: | taoranlu | Owned by: | |
|---|---|---|---|
| Priority: | minor | Milestone: | |
| Component: | VTM | Version: | VTM-8.0 |
| Keywords: | RPR | Cc: | ksuehring, XiangLi, fbossen, jvet@… |
Description
VVC spec allows the RPR ratio from down-scaling by 8 to up-scaling by 2. However in VTM 8.0, there is issue to run up-scaling case.
For example, when up-scaling ratio is 2, the encoder parameter ScalingRatioHor = ScalingRatioVer = 0.5. In this case, the sps max picture size need to be changed. When an input size is 176x144, the sps max picture size should be set to 352x288.
In current VTM implementation, sps max picture size is only fixed to be the input original picture size without considering RPR. Therefore the encoding fails at the memory bandwitdh check introduced by JVET_Q0179_SCALING_WINDOW_SIZE_CONSTRAINT. When sps max picture size is correctly set, it will not fail the check anymore.
Change history (2)
comment:1 Changed 4 years ago by taoranlu
comment:2 Changed 4 years ago by ksuehring
- Resolution set to fixed
- Status changed from new to closed
The MR was merged
A fix is provided in MR
https://vcgit.hhi.fraunhofer.de/jvet/VVCSoftware_VTM/-/merge_requests/1436