Joint Collaborative Team on Video Coding (jct-vc) Contribution

3Project development, status, and guidance

3.1Communication to and by parent bodies

3.2Conformance test set development

JCTVC-M0327 Editor's proposed draft text of HEVC conformance testing [T. Suzuki, G. Sullivan, W. Wan] [late]

Detailed presentation not necessary. See notes for M0004.

3.3Version 1 bug reports

Also see notes on pic_type in section discussing M0168 – proposed text drafted as "The value of pic_type shall be equal to 0, 1 or 2 in bitstreams conforming to this version of this Specification. Other values of pic_type are reserved for future specification by ITU-T | ISO/IEC. Decoders conforming to this version of this Specification shall ignore reserved values of pic_type."

JCTVC-M0352 Report of issue in specifications of video and image transfer characteristics (gamma) functions [D. Singer, J. Zipnick (Apple), G. J. Sullivan (Microsoft)]

Reviewed – LS suggested to be sent.

JCTVC-M0432 Editors' proposed corrections to HEVC version 1 [B. Bross, G. J. Sullivan, Y.-K. Wang] [late]

Reviewed – revisit for conformation approx Tuesday.

3.4HEVC coding performance, implementation demonstrations and design analysis

3.4.1Coding performance

JCTVC-M0041 Updated results on HEVC still picture coding performance [K. Ugur, J. Lainema (Nokia)]

(Initially reviewed in BoG M0460 chaired by A. Duenas.)

This contribution was presented and discussed in a Joint meeting of MPEG and JPEG.

JCTVC-M0166 Comparison of Compression Performance of HEVC Draft 10 with AVC for UHD-1 material [P. Andrivon, P. Bordes, M. Arena, P. Sunna (??)]

(Initially reviewed in BoG M0460 chaired by A. Duenas.)

This contribution relates performances comparison between H.264/AVC (JM18.4) and HEVC Draft 10 (HM10.0) considering 8-bit and 10-bit bit-depth UHD 3840x2160 resolution (a.k.a. 2160p or UHD-1 or Quad Full HD) material. Test material coding with different nature is assessed and both the Main Profile and the consumer-oriented Main 10 Profile. Concerning UHD-1 8 and 10 bits test material, this contribution states that HEVC Main and Main 10 Profiles (HM10.0) outperforms AVC High and equivalent High 10 Profiles (JM18.4 with HM-like configuration files) in objective measure (BD-rate) of around 25% for All Intra, 45 % for Random Access, 45 % for Low Delay B on average and it shows result of comparing HEVC and HEVC Main 10.

The results were presented based on objective (PSNR) measurement.

The results for HEVC Main Profile vs AVC High Profile (8-bit DPB) for 2160p (8-bit) sequences were reported as follows:

	Y	U	V
AI	-26.6%	-22.8%	-30.6%
RA	-47.3%	-34.7%	-41.1%
LB	-48.7%	-33.0%	-41.3%

AI gains of HEVC Main HM10.0 over JM18.4 are around 25 % for AI, 45% for both RA and LB configurations.

The results for HEVC Main 10 Profile vs AVC High Profile (10-bit DPB) for 2160p (10-bit) sequences are as follows:

	Y	U	V
AI	-25.5%	-20.8%	-26.9%
RA	-46.8%	-23.6%	-31.1%
LB	-50.8%	-28.5%	-37.3%

Results presented here for Main 10 are consistent with those presented for HEVC Main.

In JCT-VC review, it was noted that the gains shown for Main and Main 10 are significantly more substantial than what is typically observed in PSNR terms on lower-resolution material. It was also commented that a wider variety of content was used than in typical Ultra HD testing. See, for example, the results reported in JCTVC-M0329.

The results for comparing the HEVC Main and Main 10 Profiles comparison considerations for 2160p 8-bit and 10-bit sequences respectively are as follows:

	Y	U	V
AI	-5.3%	-17.0%	-24.0%
RA	-6.9%	-24.1%	-32.7%
LB	-7.3%	-25.7%	-33.9%

The numbers are to be interpreted very carefully as the table stands for a summary of different nature PSNR-based metric computation. It is remarked that 10-bit content here contains non-null two LSB. Results were computed by the JM in the 8 bit domain relative to the input to the decoder. At the input of the encoding, simple right shifting was applied. In JCT-VC review, it was suggested that the measurement method did not seem the best, and was suggested that measuring PSNR in the 10 bit domain relative to the true input would be preferable.

Considering HEVC, here above presented results as well as attached detailed results tend to show that for the considered versatile test material and test conditions, 10-bit coding does objectively not add supplementary cost than 8-bit coding in terms of objective fidelity to the source content.

The BoG acknowledged the very positive results of the current Main and Main 10 HEVC compared with AVC High and High 10 Profiles for UHD-1 content and the additional gains provided by using Main 10 HEVC profile (10 bit content) compared with Main profile on UHD 8 bit material and thanked Technicolor and Rai for their work on this contribution.

JCTVC-M0234 Combined Scalable + Multiview HEVC coding results [D.-K. Kwon, M. Budagavi (TI)]

Presented Thu a.m. in main session (no presenter had been available for BoG review Wed 15:30).

This contribution presents results for combined Scalable + Multiview HEVC (SHVC + MV-HEVC) coding. The combination of two layers for SHVC (D0 and D1) and two views for MV-HEVC (V0 and V1) is tested with SNR scalability. When compared to simulcast (independent D0, D1, V1, and V2), ‘TextureRL SHVC + MV-HEVC’ (dependent D0D1V0V1) reportedly achieved a coding gain of: AI: 40.5%, RA: 30.7%, LDP: 18.1%. When compared to two independent layers of ‘MV-HEVC simulcast’ (dependent V0V1 at D0, dependent V0V1 at D1), ‘TextureRL SHVC + MV-HEVC’ reportedly achieved a coding gain of AI: 24.7%, RA: 18.0%, LDP: 10.7%. Finally, when compared with ‘RefIdx SHVC + MV-HEVC’, ‘TextureRL SHVC + MV-HEVC’ reportedly achieved a coding gain of AI: 0.4%, RA: 2.0%, LDP: 2.0%, LDB: 1.7%.

The basic reported conclusion is that the combination is effective and it is not too difficult to create combined software.

This information was appreciated by the JCT-VC.

JCTVC-M0346 Cross-check for Combined Scalable + Multiview HEVC coding results [E. Alshina, Y. Cho] [late]
JCTVC-M0329 Comparison of Compression Performance of HEVC Draft 10 with AVC High Profile [B. Li (USTC), G. J. Sullivan, J. Xu (Microsoft)]

(Initially reviewed in BoG M0460 chaired by A. Duenas.)

This contribution is a further study of the relative objective (i.e. PSNR-based) compression performance of HEVC Main Profile and AVC High Profile. It builds upon the prior work reported in JCTVC-G399 JCTVC-H0360, JCTVC-I0409, JCTVC-J0236, JCTVC-K0279, JCTVC-L0322, updating the results by using the latest available reference software (JM-18.4 and HM-10.0). Experimental results (without class F) reportedly show that 1) for the Main Profile all-intra configuration, HM-10.0 can save about 21.9% in bit rate; 2) for the Main Profile random-access configuration, HM-10.0 can save about 34.3% in bit rate; and 3) for the Main Profile low-delay configuration, HM-10.0 can save about 36.8% in bit rate when compared with JM-18.4.

The group acknowledge the very positive results of the current Main HEVC compared with AVC High Profiles for a variety of video material and thanks USTC and Microsoft for their work on this contribution.

3.4.2Implementation demonstrations

3.4.3Design analysis