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new a1801e06ae avcodec/nvenc: add AV1 hierarchical B-frame reference mode
support
a1801e06ae is described below
commit a1801e06ae9bc6b3dbbc7087c14d6caa60e8d55b
Author: Diego de Souza <[email protected]>
AuthorDate: Thu Mar 5 23:08:34 2026 +0100
Commit: Diego de Souza <[email protected]>
CommitDate: Mon Jun 15 18:14:39 2026 +0200
avcodec/nvenc: add AV1 hierarchical B-frame reference mode support
- Check B-frame ref mode capabilities via bitmask (EACH/MIDDLE/HIERARCHICAL)
- Expose b_ref_mode hierarchical option in AV1 encoder when supported
Signed-off-by: Eshed Ram <[email protected]>
Signed-off-by: Sergey Struzh <[email protected]>
Signed-off-by: Nathan Sala <[email protected]>
Signed-off-by: Diego de Souza <[email protected]>
---
libavcodec/nvenc.c | 12 ++++++++++--
libavcodec/nvenc.h | 1 +
libavcodec/nvenc_av1.c | 7 +++++++
3 files changed, 18 insertions(+), 2 deletions(-)
diff --git a/libavcodec/nvenc.c b/libavcodec/nvenc.c
index 6c948f2de8..257b6d3892 100644
--- a/libavcodec/nvenc.c
+++ b/libavcodec/nvenc.c
@@ -606,9 +606,17 @@ static int nvenc_check_capabilities(AVCodecContext *avctx)
return AVERROR(ENOSYS);
}
break;
+#ifdef NVENC_HAVE_AV1_HGOP_SUPPORT
+ case NV_ENC_BFRAME_REF_MODE_HIERARCHICAL:
+ if (!(ret & 4)) {
+ av_log(avctx, AV_LOG_WARNING, "Hierarchical B frame reference mode
is not supported\n");
+ return AVERROR(ENOSYS);
+ }
+ break;
+#endif
default:
- av_log(avctx, AV_LOG_ERROR, "Unknown B frame reference mode!\n");
- return AVERROR_BUG;
+ av_log(avctx, AV_LOG_ERROR, "Invalid b_ref_mode value %d\n", tmp);
+ return AVERROR(EINVAL);
}
#else
tmp = (ctx->b_ref_mode >= 0) ? ctx->b_ref_mode : 0;
diff --git a/libavcodec/nvenc.h b/libavcodec/nvenc.h
index 46f1d9f4c4..32d4648f75 100644
--- a/libavcodec/nvenc.h
+++ b/libavcodec/nvenc.h
@@ -114,6 +114,7 @@ typedef void ID3D11Device;
// SDK 13.1 compile time feature checks
#if NVENCAPI_CHECK_VERSION(13, 1)
#define NVENC_NEW_COUNTING_TYPE
+#define NVENC_HAVE_AV1_HGOP_SUPPORT
#endif
typedef struct NvencSurface
diff --git a/libavcodec/nvenc_av1.c b/libavcodec/nvenc_av1.c
index 98fcc76e39..9f77dc2d92 100644
--- a/libavcodec/nvenc_av1.c
+++ b/libavcodec/nvenc_av1.c
@@ -140,10 +140,17 @@ static const AVOption options[] = {
{ "aq-strength", "When Spatial AQ is enabled, this field is used to
specify AQ strength. AQ strength scale is from 1 (low) - 15 (aggressive)",
OFFSET(aq_strength), AV_OPT_TYPE_INT, { .i64 = 8 }, 1, 15, VE },
{ "weighted_pred","Enable weighted prediction",
OFFSET(weighted_pred),AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VE },
+#ifdef NVENC_HAVE_AV1_HGOP_SUPPORT
+ { "b_ref_mode", "Use B frames as references",
OFFSET(b_ref_mode), AV_OPT_TYPE_INT, { .i64 = -1 }, -1,
NV_ENC_BFRAME_REF_MODE_HIERARCHICAL, VE, .unit = "b_ref_mode" },
+#else
{ "b_ref_mode", "Use B frames as references",
OFFSET(b_ref_mode), AV_OPT_TYPE_INT, { .i64 = -1 }, -1,
NV_ENC_BFRAME_REF_MODE_MIDDLE, VE, .unit = "b_ref_mode" },
+#endif
{ "disabled", "B frames will not be used for reference", 0,
AV_OPT_TYPE_CONST, { .i64 = NV_ENC_BFRAME_REF_MODE_DISABLED }, 0, 0, VE,
.unit = "b_ref_mode" },
{ "each", "Each B frame will be used for reference", 0,
AV_OPT_TYPE_CONST, { .i64 = NV_ENC_BFRAME_REF_MODE_EACH }, 0, 0, VE, .unit =
"b_ref_mode" },
{ "middle", "Every other B-frame as Altref2 reference, except last
in Altref interval", 0, AV_OPT_TYPE_CONST, { .i64 =
NV_ENC_BFRAME_REF_MODE_MIDDLE }, 0, 0, VE, .unit = "b_ref_mode" },
+#ifdef NVENC_HAVE_AV1_HGOP_SUPPORT
+ { "hierarchical", "B frames are used as references in a hierarchical
manner", 0, AV_OPT_TYPE_CONST, { .i64 = NV_ENC_BFRAME_REF_MODE_HIERARCHICAL },
0, 0, VE, .unit = "b_ref_mode" },
+#endif
{ "dpb_size", "Specifies the DPB size used for encoding (0 means
automatic)",
OFFSET(dpb_size),
AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, VE },
{ "ldkfs", "Low delay key frame scale; Specifies the Scene Change
frame size increase allowed in case of single frame VBV and CBR",
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