I found a simple fix to the OpenJPEG v2 library that corrects the previous crashes that occurred with the test harness.
The fix is attached to https://jira.secondlife.com/browse/SNOW-361 I also updated Robin's spreadsheet to reflect the improved performance. OpenJPEG v2 is now marginally quicker than the OpenJPEG v1.3.0 that ships with Viewer 2. Previously the OpenJPEG v2 library was crashing when it skipped over packets for higher discard levels. The library was skipping over too few bytes. Earlier test results for OpenJPEG v2 were performing a full decode. The "Reduce" feature (that performs partial decodes when the image was incomplete) had to be disabled because of the crashes. Now that the crashes are fixed, the updated test results for v2 reflect the same partial decodes that OpenJPEG v1.3.0 was performing. The fix will likely be submitted to the OpenJPEG project tomorrow night, when I have more time. Sheet Spotter -----Original Message----- From: Robin Cornelius [mailto:robin.cornel...@gmail.com] Sent: September 23, 2010 5:37 AM To: Sheet Spotter Cc: opensource-dev Subject: Re: [opensource-dev] Openjpeg/KDU the cold hard metrics On Thu, Sep 23, 2010 at 3:40 AM, Sheet Spotter <sheet.spot...@gmail.com> wrote: > There may be another option for obtaining a common set of J2C files for > comparison. > > Viewer 2 installs 784 JPEG-2000 files (*.j2c) in the "local_assets" folder > under the main install folder (e.g., "C:\Program Files\SecondLifeViewer2"). > > The "j2k_metric" test harness decoded all 784 files from the "local_assets" > folder without errors. The OpenJPEG 1.3.0 library was 3.7 times slower than > the KDU library that comes with Viewer 2.1.1.208043 (the current release > version). Hi (again) Sheet and everyone else, I've started another sheet with a fresh set of results on another system of mine, please feel free to add your own tests rows https://spreadsheets.google.com/ccc?key=0AiSrUP47_VxIdEZ4NmlSY281UXFac0ZZTkV jWGJtV1E&hl=en&authkey=CIGY9M4O If you want to compare to KDU you need to compare to KDU on your system don't compare to by KDU results or anyone elses, thats not a fair comparision. OJP 2.0 is not playing nice with the local_asset texture set needs some work. Robin _______________________________________________ Policies and (un)subscribe information available here: http://wiki.secondlife.com/wiki/OpenSource-Dev Please read the policies before posting to keep unmoderated posting privileges
