View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0000149 | JVT JM H.264/AVC reference software | decoder | public | 2008-12-13 01:14 | 2008-12-15 14:33 |
| Reporter | reedcrowe | Assigned To | Karsten Suehring | ||
| Priority | normal | Severity | minor | Reproducibility | always |
| Status | resolved | Resolution | fixed | ||
| Product Version | JM 14.2 | ||||
| Fixed in Version | JM 15.0 | ||||
| Summary | 0000149: When decoding 1080 content on PPC the decoded yuv file produces very low PSNR numbers. | ||||
| Description | When using JM to decode 1080 (I or P) content on PPC the decoded yuv file produces very low PSNR numbers. If I decode the same file on an x86 machine using the same version of JM the PSNR numbers are correct. The JM compiled on the PPC seems to work fine on 720 and 480 content. Just not on 1080. This is a IBM blade server running RHEL 5.2. | ||||
| Additional Information | Using laptop to decode h264 file ma psnr numbers SRC = /home/reedc/qa_src/crowdrun500_1080p_420.yuv, TEST = crowdrun500_1080p_420_10mb_50_jmdec_laptop.yuv Resolution = 1920x1080 Verbose Mode ON. Results output to: <analysis type>_crowdrun500_1080p_420_10mb_50_jmdec_laptop.csv Running PSNR measurements. There are at least 500 frames available for comparison. Analyzing as many frames as possible. AvgYpsnr: 27.06 AvgUpsnr: 34.29 AvgVpsnr: 34.90 AvgYUVpsnr: 28.45 Average per-frame Ypsnr = 27.12 Average per-frame Upsnr = 34.30 Average per-frame Vpsnr = 34.92 Using blade to decode ma psnr numbers SRC = /home/reedc/qa_src/crowdrun500_1080p_420.yuv, TEST = crowdrun500_1080p_420_10mb_50_jmdec_blade.yuv Resolution = 1920x1080 Verbose Mode ON. Results output to: <analysis type>_crowdrun500_1080p_420_10mb_50_jmdec_blade.csv Running PSNR measurements. There are at least 500 frames available for comparison. Analyzing as many frames as possible. AvgYpsnr: 6.83 AvgUpsnr: 6.38 AvgVpsnr: 5.85 AvgYUVpsnr: 6.58 Average per-frame Ypsnr = 6.85 Average per-frame Upsnr = 6.38 Average per-frame Vpsnr = 5.85 | ||||
| Tags | No tags attached. | ||||
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My first guess would be the cropping function at the output. The video is padded to 1088 for encoding (a multiple of 16) and cropped back at the output. I can try to check tomorrow. |
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Can you please try the following: in ldecod/src/ouptut.c, replace in the funtion write_out_picture() all calls of img2buf_normal() with img2buf() |
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Closing a fixed in JM 14.2-dev (JM 15.0). Please reopen, if the suggested solution doesn't help. |
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2008-12-13 01:14 | reedcrowe | New Issue | |
| 2008-12-13 01:42 | Karsten Suehring | Note Added: 0000256 | |
| 2008-12-13 10:49 | Karsten Suehring | Note Added: 0000257 | |
| 2008-12-13 10:49 | Karsten Suehring | Status | new => feedback |
| 2008-12-15 14:33 | Karsten Suehring | Note Added: 0000258 | |
| 2008-12-15 14:33 | Karsten Suehring | Status | feedback => resolved |
| 2008-12-15 14:33 | Karsten Suehring | Fixed in Version | => JM 14.2-dev |
| 2008-12-15 14:33 | Karsten Suehring | Resolution | open => fixed |
| 2008-12-15 14:33 | Karsten Suehring | Assigned To | => Karsten Suehring |
