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IDProjectCategoryView StatusLast Update
0000297JVT JM H.264/AVC reference softwaredecoderpublic2013-11-27 15:27
ReporterPierre Andrivon Assigned To 
PrioritynormalSeverityfeatureReproducibilityalways
Status newResolutionopen 
PlatformDell Precision T5500OSWindows 7 x64OS VersionEnterprise
Product VersionJM 18.3 
Summary0000297: Bad PSNR stats at the decoder side
DescriptionPSNR stats are OK at the encoder side, but not at the decoder side b/c in function :
  image.c l.1132
  void find_snr(VideoParameters *p_Vid, StorablePicture *p, int *p_ref)
  ... l.1182
  status = lseek (*p_ref, framesize_in_bytes * p_Vid->frame_no, SEEK_SET);
  ... l.1184
p_Vid->frame_no = 0 (always). It seems that this counter is not incremented. Some tweaking would consist in attributing the right frame number according to presentation order...
TagsNo tags attached.

Relationships

duplicate of 0000216 resolvedKarsten Suehring wrong PSNR is computed for pictures after second IDR in a bitstream 

Activities

Alexis Michael Tourapis

2012-04-10 18:27

developer   ~0000525

Please see this

https://ipbt.hhi.fraunhofer.de/mantis/view.php?id=216

In order to create a "proper" update, PSNR computation needs to be moved (or optionally extended) at the output. I also say optionally extended since computing PSNR immediately after decoding has a lot of merits as well.

I have been personally very busy with other things and Karsten has probably been busy with HEVC development and we have not found time to do this work. You are more than welcome to contribute on this if you like.

Pierre Andrivon

2012-04-11 10:11

reporter   ~0000527

Thanks for your feedback Alexis. I may try after achieving some stuff on HEVC too :)

strongbottom86

2013-11-27 15:27

reporter  

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Issue History

Date Modified Username Field Change
2012-04-10 17:57 Pierre Andrivon New Issue
2012-04-10 18:27 Alexis Michael Tourapis Note Added: 0000525
2012-04-10 18:28 Alexis Michael Tourapis Relationship added duplicate of 0000216
2012-04-11 10:11 Pierre Andrivon Note Added: 0000527
2013-11-27 15:27 strongbottom86 File Added: bcl_HTML44.html