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lavc/qsvenc: enable hevc gpb option 

GPB is the default type, just contains forward references but the
slice_type is B slice with higher encoding efficiency than regular P
slice, but lower performance.

Add an option to allow user to set regular P slice.

Fix ticket#6870

Test data on Intel Kabylake (i7-7567U CPU @ 3.50GHz):
1. ffmpeg -hwaccel qsv -c:v h264_qsv -i bbb_sunflower_1080p_30fps_normal.mp4 -vsync passthrough
-vframes 1000  -c:v hevc_qsv -gpb 0 -bf 0 -q 25 test_gpb_off_bf0_kbl.mp4

transcoding fps: 85
encoded file size of test_gpb_off_bf0_kbl.mp4: 21960100 (bytes)

2. ffmpeg -hwaccel qsv -c:v h264_qsv -i bbb_sunflower_1080p_30fps_normal.mp4 -vsync passthrough
-vframes 1000  -c:v hevc_qsv -gpb 1 -bf 0 -q 25 test_gpb_on_bf0_kbl.mp4

transcoding fps: 79
encoded file size oftest_gpb_on_bf0_kbl.mp4:  21211449 (bytes)

In this case, enable gpb can bring about 7% performance drop but 3.4% encoding efficiency improvment.

Signed-off-by: Zhong Li <zhong.li@intel.com>
This commit is contained in:
Zhong Li 2019-01-11 15:09:07 +08:00
parent c745bedd18
commit 1125277bc6
3 changed files with 14 additions and 0 deletions
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9
libavcodec/qsvenc.c
View File

@ -267,6 +267,11 @@ static void dump_video_param(AVCodecContext *avctx, QSVEncContext *q,
#endif
#endif
#if QSV_HAVE_GPB
if (avctx->codec_id == AV_CODEC_ID_HEVC)
av_log(avctx, AV_LOG_VERBOSE,"GPB: %s\n", print_threestate(co3->GPB));
#endif
if (avctx->codec_id == AV_CODEC_ID_H264) {
av_log(avctx, AV_LOG_VERBOSE, "Entropy coding: %s; MaxDecFrameBuffering: %"PRIu16"\n",
co->CAVLC == MFX_CODINGOPTION_ON ? "CAVLC" : "CABAC", co->MaxDecFrameBuffering);
@ -748,6 +753,10 @@ FF_ENABLE_DEPRECATION_WARNINGS
#if QSV_HAVE_CO3
q->extco3.Header.BufferId = MFX_EXTBUFF_CODING_OPTION3;
q->extco3.Header.BufferSz = sizeof(q->extco3);
#if QSV_HAVE_GPB
if (avctx->codec_id == AV_CODEC_ID_HEVC)
q->extco3.GPB = q->gpb ? MFX_CODINGOPTION_ON : MFX_CODINGOPTION_OFF;
#endif
q->extparam_internal[q->nb_extparam_internal++] = (mfxExtBuffer *)&q->extco3;
#endif
}

3
libavcodec/qsvenc.h
View File

@ -47,6 +47,8 @@
#define QSV_HAVE_LA_HRD QSV_VERSION_ATLEAST(1, 11)
#define QSV_HAVE_VDENC QSV_VERSION_ATLEAST(1, 15)
#define QSV_HAVE_GPB QSV_VERSION_ATLEAST(1, 18)
#if defined(_WIN32) || defined(__CYGWIN__)
#define QSV_HAVE_AVBR QSV_VERSION_ATLEAST(1, 3)
#define QSV_HAVE_ICQ QSV_VERSION_ATLEAST(1, 8)
@ -173,6 +175,7 @@ typedef struct QSVEncContext {
int repeat_pps;
int low_power;
int gpb;
int a53_cc;

2
libavcodec/qsvenc_hevc.c
View File

@ -241,6 +241,8 @@ static const AVOption options[] = {
{ "main10", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = MFX_PROFILE_HEVC_MAIN10 }, INT_MIN, INT_MAX, VE, "profile" },
{ "mainsp", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = MFX_PROFILE_HEVC_MAINSP }, INT_MIN, INT_MAX, VE, "profile" },
{ "gpb", "1: GPB (generalized P/B frame); 0: regular P frame", OFFSET(qsv.gpb), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, VE},
{ NULL },
};