avcodec/nvenc: set slice number to 1 to improve encoding quality

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

libavcodec/nvenc.c

@@ -876,6 +876,9 @@ static av_cold int nvenc_encode_init(AVCodecContext *avctx)
 
         ctx->encode_config.encodeCodecConfig.h264Config.h264VUIParameters.videoFullRangeFlag = avctx->color_range == AVCOL_RANGE_JPEG;
 
+        ctx->encode_config.encodeCodecConfig.h264Config.sliceMode = 3;
+        ctx->encode_config.encodeCodecConfig.h264Config.sliceModeData = 1;
+
         ctx->encode_config.encodeCodecConfig.h264Config.disableSPSPPS = (avctx->flags & AV_CODEC_FLAG_GLOBAL_HEADER) ? 1 : 0;
         ctx->encode_config.encodeCodecConfig.h264Config.repeatSPSPPS = (avctx->flags & AV_CODEC_FLAG_GLOBAL_HEADER) ? 0 : 1;
 
@@ -940,6 +943,9 @@ static av_cold int nvenc_encode_init(AVCodecContext *avctx)
 
         break;
     case AV_CODEC_ID_H265:
+        ctx->encode_config.encodeCodecConfig.hevcConfig.sliceMode = 3;
+        ctx->encode_config.encodeCodecConfig.hevcConfig.sliceModeData = 1;
+
         ctx->encode_config.encodeCodecConfig.hevcConfig.disableSPSPPS = (avctx->flags & AV_CODEC_FLAG_GLOBAL_HEADER) ? 1 : 0;
         ctx->encode_config.encodeCodecConfig.hevcConfig.repeatSPSPPS = (avctx->flags & AV_CODEC_FLAG_GLOBAL_HEADER) ? 0 : 1;