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Jingning Han authored
This speed feature allows the encoder to largely remove the spatial dependency between blocks inside a 64x64 superblock, thereby removing the need to repeatedly encode superblocks per partition type in the rate-distortion optimization loop. A major challenge lies in the intra modes tested in the rate-distortion optimization loop. The subsequent blocks do not have access to the reconstructed boundary pixels without the intermediate coding steps. This was resolved by using the original pixels for intra prediction in the rd loop, followed by an appropriately designed distortion modeling on the quantization parameters. Experiments also suggested that the performance impact is more discernible at lower bit-rate/psnr settings. Hence a quantizer dependent threshold is applied to deactivate skip of block coding. For bus_cif at 2000 kbps, speed 0: runtime 269854ms -> 237774ms (12% speed-up) at 0.05dB performance loss. speed 1: runtime 65312ms -> 61536ms, (7% speed-up) at 0.04dB performance loss. This operation is currently turned on in settings of speed 1. Change-Id: Ib689741dfff8dd38365d8c1b92860a3e176f56ecfaff6ed0
changes-5.1.0 949 B
Qt 5.1 introduces many new features and improvements as well as bugfixesover the 5.0.x series. For more details, refer to the online documentationincluded in this distribution. The documentation is also available online: http://qt-project.org/doc/qt-5.1The Qt version 5.1 series is binary compatible with the 5.0.x series.Applications compiled for 5.0 will continue to run with 5.1.Some of the changes listed in this file include issue tracking numberscorresponding to tasks in the Qt Bug Tracker: http://bugreports.qt-project.org/Each of these identifiers can be entered in the bug tracker to obtain moreinformation about a particular change.***************************************************************************** General ***************************************************************************** - This release contains only minor code improvements.