View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0000256 | JVT JM H.264/AVC reference software | encoder and decoder | public | 2011-04-25 09:23 | 2011-05-02 12:55 |
| Reporter | Ajay Basarur | Assigned To | Yuwen He | ||
| Priority | urgent | Severity | tweak | Reproducibility | always |
| Status | resolved | Resolution | fixed | ||
| Product Version | JM 17.2 | ||||
| Fixed in Version | JM 18.0 | ||||
| Summary | 0000256: DPB Size Usage for Encoder & Decoder | ||||
| Description | According to Annex H , the DPB size is calculated as below The DPB size depends upon the number of views. In section H.10.2 point (f), standard mentioned an equation for DPB size [page 651] Max_DPBSize = Min( mvcScaleFactor * MaxDpbMbs / ( PicWidthInMbs * FrameHeightInMbs ), Max( 1, Ceil( log2( NumViews ) ) ) * 16 ); [where Ceil( x ) the smallest integer greater than or equal to x] So, the whole equation should not exceed the second operand value i.e. [Max(1, Ceil(log2(NumViews))) * 16]. The dpbsize based on equation is… NumViews Max DPB Size 1 Or 2 16 3 Or 4 32 5,6,7 Or 8 48 -------------------------------------------------------------------------------- Problem: The Encoder & Decoder uses DPB size of 32 for 2 Views. According to standard it should be restricted to 16 only. | ||||
| Steps To Reproduce | Files - mbuffer.c [Decoder] function: GetMaxDecFrameBuffering () Files - mbuffer.c [Encoder] line no: 232 | ||||
| Tags | No tags attached. | ||||
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2011-04-25 09:23 | Ajay Basarur | New Issue | |
| 2011-05-02 12:55 | Karsten Suehring | Note Added: 0000452 | |
| 2011-05-02 12:55 | Karsten Suehring | Status | new => resolved |
| 2011-05-02 12:55 | Karsten Suehring | Fixed in Version | => JM 18.0 |
| 2011-05-02 12:55 | Karsten Suehring | Resolution | open => fixed |
| 2011-05-02 12:55 | Karsten Suehring | Assigned To | => Yuwen He |
