PR #21774 opened by Diego de Souza (ddesouza) URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21774 Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21774.patch
For AV1, NV_ENC_BFRAME_REF_MODE_MIDDLE does not use a single middle B-frame. Per the NVENC Programming Guide, it sets every other B-frame as an Altref2 reference except the last B-frame in the Altref interval. Signed-off-by: Diego de Souza <[email protected]> >From 2b8cffea34d04d1542360e84e1ed469be7970f54 Mon Sep 17 00:00:00 2001 From: Diego de Souza <[email protected]> Date: Tue, 17 Feb 2026 17:04:18 +0100 Subject: [PATCH] avcodec/nvenc_av1: fix b_ref_mode "middle" help string for AV1 For AV1, NV_ENC_BFRAME_REF_MODE_MIDDLE does not use a single middle B-frame. Per the NVENC Programming Guide, it sets every other B-frame as an Altref2 reference except the last B-frame in the Altref interval. Signed-off-by: Diego de Souza <[email protected]> --- libavcodec/nvenc_av1.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/libavcodec/nvenc_av1.c b/libavcodec/nvenc_av1.c index 446ba684e6..98fcc76e39 100644 --- a/libavcodec/nvenc_av1.c +++ b/libavcodec/nvenc_av1.c @@ -143,7 +143,7 @@ static const AVOption options[] = { { "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" }, { "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", "Only (number of B frames)/2 will be used for reference", 0,AV_OPT_TYPE_CONST, { .i64 = NV_ENC_BFRAME_REF_MODE_MIDDLE }, 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" }, { "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", -- 2.52.0 _______________________________________________ ffmpeg-devel mailing list -- [email protected] To unsubscribe send an email to [email protected]
