Deliver High Quality High Performance HEVC via Intel® Media Server Studio

Quality Evaluation Results for 4:2:2 8-bit Content
Before discussing detailed BD rate differences of each Media Server Studio TU mode wrt HM14, we first
establish the quality/bitrate tradeoff of HM 14 that will be used as reference.
HD1080p Test
Sequence
First, each video sequence of each test set (such as HD1080p, 720p) is encoded using MPEG HEVC HM14
Reference Encoder with each of 4 quantizers as specified in Tables 11A-11B. The overall PSNR (averaged
over frames) for each test sequence for each Qp for each of luma (Y), and associated chroma
components (U and V) is collected along with the generated coding bitrate. For instance, Tables 12A-12B
show the luma PSNR (chroma PSNR is also collected but is not shown to keep tables manageable in size)
and total bitrate for each test sequence for each of 4 Qps is collected and is used in curve fitting to
generate a continuous RD curve for HM14 encoding of that test sequence.
Next, Media Server Studio HEVC Software Encoder in each of its 4 main modes: TU1, TU4, TU7, and
TU7gacc is utilized to perform encoding of each test sequence with each of 4 quantizers (of Table 11A-11B)
used in HM 14 encoding, and PSNRs of Y, U, and V, and total bitrates are collected for each test.
Table 12A PSNR Y, and Total Bitrate for each of 4 QPs by HM 14 Codec on 4:2:2 8-bit HD1080p Test set
Qp1 PSNR, Bitrate, Qp2 PSNR, Bitrate, Qp3 PSNR, Bitrate, Qp4 PSNR, Bitrate,
dB Y kbps dB Y kbps dB Y kbps dB Y kbps
1 RushFieldCuts 40.02 19450.9 37.25 7191.2 34.70 3209.9 32.16 1589.2
2 Red_Kayak 41.89 16506.7 38.76 7987.6 35.62 3685.4 32.88 1653.7
3 TouchDownPass 40.42 5995.0 39.34 2984.7 37.80 1464.8 36.13 791.4
720p Test
Sequence
Table 12B PSNR Y, and Total Bitrate for each of 4 QPs by HM 14 Codec on 4:2:2 8-bit 720p Test set
Qp1 PSNR, Bitrate, Qp2 PSNR, Bitrate, Qp3 PSNR, Bitrate, Qp4 PSNR, Bitrate,
dB Y kbps dB Y kbps dB, Y kbps dB, Y kbps
1 CrowdRun 34.50 16213.2 31.63 8760.9 29.05 4684.5 26.84 2492.8
2 Ducks_take_off 32.29 15641.9 30.42 8978.0 28.21 4205.4 27.24 2867.8
3 Park_joy 33.90 19524.1 31.64 11946.9 28.87 5927.4 26.52 2861.1
For Media Server Studio HEVC codec in each encoding mode, the 4 collected bitrates and corresponding 4
PSNRs (each corresponding to one Qp) are used in curve fitting to generate a continuous RD curve for
each encoding mode. Further, for each test sequence and for each Media Server Studio TU mode, the
corresponding Media Server Studio RD curve is compared to HM14 RD curve and a BD rate percentage is
computed that reflects the difference in quality between specific Media Server Studio TU mode with
respect to HM14 reference. The BD rate provides a measure of departure of Media Server Studio TU
mode’s quality in percentage bits with respect to the HM14 reference.
Deliver High Quality, High Performance HEVC via Intel® Media Server Studio
Table 13A-13B show the measured BD rate percentage bitrate for each of luma and chroma components
for each test sequence of each test set of Table 11A-11B for each of 4 TU modes being evaluated. Fig. 17A1-
17B2 compares the RD characteristics of two codecs for each test set for TU1 and TU4 modes where the
difference in quality is the highest and the lowest wrt HM14 reference.
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