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avcodec/nvenc_av1: fix b_ref_mode "middle" help string for AV1

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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 <ddesouza@nvidia.com>
This commit is contained in:
Diego de Souza
2026-02-17 17:04:18 +01:00
committed by Timo Rothenpieler
parent b98ec6d312
commit cb0f4de1f5
1 changed files with 1 additions and 1 deletions
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2
libavcodec/nvenc_av1.c
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@@ -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",