[FFmpeg-cvslog] avcodec/nvenc: clamp initial qp value to [1, 51]

[Agatha Hu]

ffmpeg | branch: master | Agatha Hu <ahu at nvidia.com> | Mon Dec 14 10:34:59 2015 +0100| [758be457564983b879122f6e08701aa236a7f3bf] | committer: Timo Rothenpieler

avcodec/nvenc: clamp initial qp value to [1, 51]

Signed-off-by: Timo Rothenpieler <timo at rothenpieler.org>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=758be457564983b879122f6e08701aa236a7f3bf
---

 libavcodec/nvenc.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/libavcodec/nvenc.c b/libavcodec/nvenc.c
index 4ab56fe..31f2dfd 100644
--- a/libavcodec/nvenc.c
+++ b/libavcodec/nvenc.c
@@ -843,10 +843,10 @@ static av_cold int nvenc_encode_init(AVCodecContext *avctx)
         ctx->encode_config.rcParams.initialRCQP.qpInterP  = qp_inter_p;
 
         if(avctx->i_quant_factor != 0.0 && avctx->b_quant_factor != 0.0) {
-            ctx->encode_config.rcParams.initialRCQP.qpIntra = qp_inter_p * fabs(avctx->i_quant_factor);
-            ctx->encode_config.rcParams.initialRCQP.qpIntra += avctx->i_quant_offset;
-            ctx->encode_config.rcParams.initialRCQP.qpInterB = qp_inter_p * fabs(avctx->b_quant_factor);
-            ctx->encode_config.rcParams.initialRCQP.qpInterB += avctx->b_quant_offset;
+            ctx->encode_config.rcParams.initialRCQP.qpIntra = av_clip(
+                qp_inter_p * fabs(avctx->i_quant_factor) + avctx->i_quant_offset, 0, 51);
+            ctx->encode_config.rcParams.initialRCQP.qpInterB = av_clip(
+                qp_inter_p * fabs(avctx->b_quant_factor) + avctx->b_quant_offset, 0, 51);
         } else {
             ctx->encode_config.rcParams.initialRCQP.qpIntra = qp_inter_p;
             ctx->encode_config.rcParams.initialRCQP.qpInterB = qp_inter_p;