View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0000086 | JVT JM H.264/AVC reference software | encoder | public | 2007-12-12 19:46 | 2007-12-17 12:31 |
| Reporter | Luca | Assigned To | Karsten Suehring | ||
| Priority | normal | Severity | minor | Reproducibility | always |
| Status | resolved | Resolution | fixed | ||
| Product Version | JM 13.1 | ||||
| Fixed in Version | JM 13.2 | ||||
| Summary | 0000086: Outputted average QP with slice dimension fixed in bytes | ||||
| Description | Dear Experts, I faced a problem with the output on-screen when encoding sequences with slicing mode "2" (slice dimension fixed in bytes). The quantization parameter indicated, usually was bigger than the one I selected (without RDO of course). I found out that it is calculated after completing the encoding as img->AverageFrameQP = (img->SumFrameQP + (img->FrameSizeInMbs >> 1))/img->FrameSizeInMbs; Actually I found out that the variable img->SumFrameQP is updated in write_one_macroblock as img->SumFrameQP += currMB->qp; each time a MB is encoded. Keeping a fixed slice dimension, a MB can be encoded twice: a first time in case it, as last MB of a slice, let the current slice exceed the threshold, and a second time as first MB of the following slice. Therefore, to my understanding, the img->SumFrameQP should not be updated in case the "recode_macroblock" flag is set to "TRUE", and possibly, also the trace file should not be updated. Since this is my first report, please tell me if the reported information were sufficient, and please tell me also if I can help you solving this. | ||||
| Tags | No tags attached. | ||||
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2007-12-12 19:46 | Luca | New Issue | |
| 2007-12-12 21:07 | Karsten Suehring | Category | decoder => encoder |
| 2007-12-17 12:31 | Karsten Suehring | Status | new => resolved |
| 2007-12-17 12:31 | Karsten Suehring | Fixed in Version | => JM 13.1-dev |
| 2007-12-17 12:31 | Karsten Suehring | Resolution | open => fixed |
| 2007-12-17 12:31 | Karsten Suehring | Assigned To | => Karsten Suehring |
| 2007-12-17 12:31 | Karsten Suehring | Note Added: 0000135 |
