avcodec/cuviddec: set ulMaxDisplayDelay to zero if low_delay flag is set

Zero is the recommended value in Nvidia coding samples for low latency use-cases.

Signed-off-by: Michal Novotny <michal.novotny@comprimato.com>
Signed-off-by: Timo Rothenpieler <timo@rothenpieler.org>

libavcodec/cuviddec.c

@@ -999,7 +999,7 @@ static av_cold int cuvid_decode_init(AVCodecContext *avctx)
     }
 
     ctx->cuparseinfo.ulMaxNumDecodeSurfaces = ctx->nb_surfaces;
-    ctx->cuparseinfo.ulMaxDisplayDelay = 4;
+    ctx->cuparseinfo.ulMaxDisplayDelay = (avctx->flags & AV_CODEC_FLAG_LOW_DELAY) ? 0 : 4;
     ctx->cuparseinfo.pUserData = avctx;
     ctx->cuparseinfo.pfnSequenceCallback = cuvid_handle_video_sequence;
     ctx->cuparseinfo.pfnDecodePicture = cuvid_handle_picture_decode;