View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0000321 | JVT JM H.264/AVC reference software | encoder | public | 2013-01-21 15:59 | 2013-05-07 16:25 |
| Reporter | Pierre Andrivon | Assigned To | Karsten Suehring | ||
| Priority | normal | Severity | minor | Reproducibility | always |
| Status | resolved | Resolution | fixed | ||
| Platform | RedHat Entreprise | OS | Linux | OS Version | 5.6 |
| Product Version | JM 18.4 | ||||
| Fixed in Version | JM 18.5 | ||||
| Summary | 0000321: Bitrate increase with GCC4.1.2 in JM18.4 with HM-like config | ||||
| Description | When using a GCC4.1.2 compiler to compile JM18.4 and then using HM-like files, bitstream bitrate increases for non-intra bitstreams (in comparison with "true" results found when comparing with other firms bitstreams results and GCC debug as well as windows debug/release modes). However, encoder and decoder results match and PSNR are coherent. This behavior was not observed for JM18.3 and HM-like config files and as there is no decoder/encoder mismatch so that it is difficult to trace the issue. It might come from a bad initialized variable introduced in JM18.4 that would introduce low performances at the RDO stage or unlikely a bad compiler optimization (-02) however in the last case it is likely that we may observe mismatch between encoder/decoder... It is remarked that the newly added option "Wno-unused-but-set-variable" is not supported by GCC4.1.2. | ||||
| Steps To Reproduce | compile in release mode JM18.4 with GCC4.1.2 then run a non only intra encoding with HM-like config files. | ||||
| Tags | No tags attached. | ||||
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Unfortunately I don't have gcc 4.1.2 (gcc version I am using is 4.2.1) but I am wondering if this relates to a bug that we recently fixed that impacted level 5.2. in particular, in conformance.c one should extend LEVELVMVLIMIT to 18 elements instead of 17, since otherwise a memory leak would occur. static const int LEVELVMVLIMIT[18][6] = { { -63, 63, -128, 127, -256, 255}, { -63, 63, -128, 127, -256, 255}, { -127, 127, -256, 255, -512, 511}, { -127, 127, -256, 255, -512, 511}, { -127, 127, -256, 255, -512, 511}, { -127, 127, -256, 255, -512, 511}, { -255, 255, -512, 511, -1024, 1023}, { -255, 255, -512, 511, -1024, 1023}, { -255, 255, -512, 511, -1024, 1023}, { -511, 511, -1024, 1023, -2048, 2047}, { -511, 511, -1024, 1023, -2048, 2047}, { -511, 511, -1024, 1023, -2048, 2047}, { -511, 511, -1024, 1023, -2048, 2047}, { -511, 511, -1024, 1023, -2048, 2047}, { -511, 511, -1024, 1023, -2048, 2047}, { -511, 511, -1024, 1023, -2048, 2047}, { -511, 511, -1024, 1023, -2048, 2047}, { -511, 511, -1024, 1023, -2048, 2047} }; |
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Closing as resolved. Please reopen, if the problem was not related to level 5.2 |
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2013-01-21 15:59 | Pierre Andrivon | New Issue | |
| 2013-04-26 11:10 | Alexis Michael Tourapis | Note Added: 0000565 | |
| 2013-05-07 16:25 | Karsten Suehring | Note Added: 0000572 | |
| 2013-05-07 16:25 | Karsten Suehring | Status | new => resolved |
| 2013-05-07 16:25 | Karsten Suehring | Fixed in Version | => JM 18.5 |
| 2013-05-07 16:25 | Karsten Suehring | Resolution | open => fixed |
| 2013-05-07 16:25 | Karsten Suehring | Assigned To | => Karsten Suehring |
