Joint Collaborative Team on Video Coding (jct-vc)
Project development, status, and guidance (34)
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- Bu səhifədəki naviqasiya:
- 3.3Version 1 bug reports and cleanup (1)
- 3.4RExt text improvements (3)
- 3.5HEVC coding performance, implementation demonstrations and design analysis (13)
- 3.5.2RExt coding performance (5)
- 3.5.3SHVC coding performance (2 - done)
- 3.5.4SHVC design aspects (2 - done)
- 3.5.5Implementation demonstrations (1)
3Project development, status, and guidance (34)3.1Communication to and by parent bodies (0)3.2Conformance test set development (2)JCTVC-O0084 Editor's proposed draft text of HEVC conformance testing [T. Suzuki, G. Sullivan, W. Wan] JCTVC-O0104 Corner case conformance streams [C. Fogg (Harmonic)] 3.3Version 1 bug reports and cleanup (1)JCTVC-O0054 Editors' proposed corrections to HEVC version 1 [Y.-K. Wang, G. J. Sullivan, B. Bross] Reviewed Tues. 29th (GJS). Detailed review was not deemed necessary. Decision (Ed.): Approved as our current state of errata reporting, to be integrated into RExt when it is final. One addition correction was noted and agreed was changing "nominal" to "extended" in the semantics of reference_screen_luminance_white. See also notes for O0002 (esp. regarding quantization groups, which should be further studied to determine whether action is needed). 3.4RExt text improvements (3)JCTVC-O0042 Proposed Editorial Improvements to High efficiency video coding (HEVC) Range Extensions Text Specification Draft 4 [D. Flynn (BlackBerry)] [miss] JCTVC-O0133 Text fixes for inter RDPCM in HEVC-Rext [M. Naccari, M. Mrak (BBC)] JCTVC-O0192 AHG5/AHG6/AHG9: Text changes for HEVC Range Extensions [P. Lai, S. Liu, S. Lei (MediaTek)] 3.5HEVC coding performance, implementation demonstrations and design analysis (13)3.5.1Version 1 verification test (1)JCTVC-O0267 Proposed updates to HEVC verification test plan draft 1 [T.K. Tan (NTT DOCOMO)] Reviewed Tues. 29th (GJS). This document contains the draft plan for the video verification test to be conducted to verify the coding performance of the HEVC Main and Main 10 profiles. A formal subjective evaluation will be conducted comparing the HEVC Main and Main 10 profiles to the AVC High and High 10 profiles, respectively. A range of video resolutions from 480p to 4K will be tested. This document contains proposed updates to the JCTVC-N1011 document. Test sequences and encoding bitrates for use in the verification test plan are proposed for discussions and consideration at the JCTVC meeting in Geneva. See also notes on AHG report O0019.
Reviewed Tues 29th (GJS). This contribution proposes to restore previous SHVC common test conditions to simplify the software implementation and be consistent with HM configurations. It was asserted that the proposed change can be simply achieved by disabling the macro in the SHM software. At the last meeting, there was a (non-normative, encoder-only) change to reference picture list construction (associated with a macro FINAL_RPL_CHANGE_N0082). It was reported that this introduced difficulties in working with the software, and had no significant effect on compression. Decision (S/W): Disable the encoder-only change macro (FINAL_RPL_CHANGE_N0082). It was remarked that default reference picture list construction has been proposed to be modified in some way, and the proper impact of this on CTC has not been determined. JCTVC-O0243 Cross-check report of AHG10/AHG12: On SHM Common Test Conditions (JCTVC-O0097) [O. Nakagami (Sony)] Reviewed Tues 29th (GJS). Confirmed that there is no significant impact for the proposed change.
Reviewed Tues 29th (GJS). This contribution describes an implementation of the SHVC decoder in a "GPAC" player context. The SHVC decoder is based on the open source software "OpenHEVC", which reportedly implements a conforming HEVC decoder (2x-5x faster than HM decoder). The proposed pipeline and parallel SHVC decoder enables two levels of parallelism. The first level decodes the base layer and the enhancement layer frames in parallel. The second level of parallelism performs the decoding of both the base layer and the enhancement layer in parallel by taking advantage of the HEVC wavefronts and tiles high-level parallel processing features. Experimental results carried out on a computer fitted with an Intel Xeon processor running at 3.4 GHz reportedly showed that the pipeline SHVC decoder achieves the decoding of 1920x1080 base layer and 2560x1600 enhancement layer at 45 frames per second when using six concurrent threads. This type of work was suggested to be complementary to that described in O0165, since this one focus on tiles & wavefronts and the other focused on the slice level and CTB level.
Reviewed Tues 29th (GJS). This contribution describes a parallel decoding framework for SHVC. Various optimization technologies were reportedly implemented on the basis of SHM-2.0 software to achieve real time decoding speed. Multi-threading and SIMD optimizations were reportedly applied to accelerate the decoding process. Experiments on a desktop with Intel i7 processor 2600 running at 3.4 GHz reportedly show that the parallel SHVC software decoder is able to decode 1080p spatial 2x scalability up to 60 fps (frames per second) and 1080p spatial 1.5x scalability up to 50 fps. The bitstreams were reportedly generated with SHVC common test conditions. One thread was used for entropy decoding and multiple threads were used for decompression based on "CTB groups" and an "application thread manager" was used for control. SIMD was used for MC, IQ, IT, and reconstruction. The contributor suggested that this confirms that the reference index approach provides a suitable design for real-time decoding.
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