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new 197f854a2e avcodec/nvenc: warn when av1_nvenc qp_cr_offset differs
from qp_cb_offset
197f854a2e is described below
commit 197f854a2e75e476f09a9ec81e5d309eb8439283
Author: Diego de Souza <[email protected]>
AuthorDate: Tue May 19 09:50:10 2026 +0200
Commit: Timo Rothenpieler <[email protected]>
CommitDate: Tue May 19 14:22:13 2026 +0000
avcodec/nvenc: warn when av1_nvenc qp_cr_offset differs from qp_cb_offset
The NVENC driver currently forces deltaQ_v_ac equal to deltaQ_u_ac for
AV1, so crQPIndexOffset is silently ignored. The SDK header annotates
the field as "for future use only" (nvEncodeAPI.h, NV_ENC_RC_PARAMS).
Reported in #22737
Signed-off-by: Diego de Souza <[email protected]>
---
libavcodec/nvenc.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/libavcodec/nvenc.c b/libavcodec/nvenc.c
index 7b9f7260df..e9ca6e01fd 100644
--- a/libavcodec/nvenc.c
+++ b/libavcodec/nvenc.c
@@ -1162,6 +1162,13 @@ static av_cold int
nvenc_setup_rate_control(AVCodecContext *avctx)
#ifdef NVENC_HAVE_QP_CHROMA_OFFSETS
ctx->encode_config.rcParams.cbQPIndexOffset = ctx->qp_cb_offset;
ctx->encode_config.rcParams.crQPIndexOffset = ctx->qp_cr_offset;
+
+ if (avctx->codec->id == AV_CODEC_ID_AV1 &&
+ ctx->qp_cr_offset != ctx->qp_cb_offset)
+ av_log(avctx, AV_LOG_WARNING,
+ "av1_nvenc: qp_cr_offset is currently ignored by the NVENC
driver "
+ "(deltaQ_v_ac is forced equal to deltaQ_u_ac); only
qp_cb_offset "
+ "takes effect.\n");
#else
if (ctx->qp_cb_offset || ctx->qp_cr_offset)
av_log(avctx, AV_LOG_WARNING, "Failed setting QP CB/CR offsets, SDK
11.1 or greater required at compile time.\n");
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