View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0000068 | JVT JM H.264/AVC reference software | encoder | public | 2007-08-05 03:03 | 2007-11-29 14:43 |
| Reporter | tetzlaff | Assigned To | |||
| Priority | normal | Severity | major | Reproducibility | always |
| Status | closed | Resolution | fixed | ||
| Product Version | JM 12.4 | ||||
| Fixed in Version | JM 13.1 | ||||
| Summary | 0000068: Encoder doesn't handle the 4:4:4 QPPrimeYZeroTransformBypassFlag correctly | ||||
| Description | Very much related to issue 0000066. The encoder doesn't produce the Chroma AC coefficients in this lossless mode. So, the resulting .264 file is shorter than expected and the decoder, which appears to decode this file correctly, will not yield a lossless result. In block.c in the encoder source, the lossless portion of the dct_chroma AC routine does not set a value on cr_cbp. Taking a stab, I added a line "cr_cbp = 2" at line 1791. (This is almost at the end of the dct_chroma function, within the last section of code executed only when the lossless flag is true.) With that, the encoder produced a .264 file that included Chroma AC coefficients, and the decoder produced a yuv file that matched original input file. I can't claim to really know if this is a complete fix or not. | ||||
| Additional Information | Related to issue 0000066. I believe issue 0000066 is an encoder issue only. | ||||
| Tags | No tags attached. | ||||
| related to | 0000066 | closed | Problems with lossless coding mode for RGB (4:4:4) I frame coding |
|
|
Similar to id 66 this should be solved after implementing the new 4:4:4 lossless mode. |
|
|
should be fixed by implementation of new 4:4:4 common mode |
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2007-08-05 03:03 | tetzlaff | New Issue | |
| 2007-08-08 13:49 | Karsten Suehring | Relationship added | related to 0000066 |
| 2007-08-08 13:50 | Karsten Suehring | Note Added: 0000088 | |
| 2007-08-08 13:50 | Karsten Suehring | Status | new => acknowledged |
| 2007-11-29 14:43 | Karsten Suehring | Status | acknowledged => closed |
| 2007-11-29 14:43 | Karsten Suehring | Note Added: 0000134 | |
| 2007-11-29 14:43 | Karsten Suehring | Resolution | open => fixed |
| 2007-11-29 14:43 | Karsten Suehring | Fixed in Version | => JM-13.0-dev |
