avcodec/amfenc: GOP size check

Fix for the error with an invalid GOP size parameter.

libavcodec/amfenc_av1.c

@@ -276,7 +276,9 @@ FF_ENABLE_DEPRECATION_WARNINGS
     }
 
     // Picture control properties
+    if (avctx->gop_size != -1) {
         AMF_ASSIGN_PROPERTY_INT64(res, ctx->encoder, AMF_VIDEO_ENCODER_AV1_GOP_SIZE, avctx->gop_size);
+    }
 
     // Setup header insertion mode only if this option was defined explicitly
     if (ctx->header_insertion_mode != -1) {

libavcodec/amfenc_h264.c

@@ -517,7 +517,9 @@ FF_ENABLE_DEPRECATION_WARNINGS
     AMF_ASSIGN_PROPERTY_BOOL(res, ctx->encoder, AMF_VIDEO_ENCODER_DE_BLOCKING_FILTER, !!deblocking_filter);
 
     // Keyframe Interval
+    if (avctx->gop_size != -1) {
         AMF_ASSIGN_PROPERTY_INT64(res, ctx->encoder, AMF_VIDEO_ENCODER_IDR_PERIOD, avctx->gop_size);
+    }
 
     // Header Insertion Spacing
     if (ctx->header_spacing >= 0)

libavcodec/amfenc_hevc.c

@@ -261,7 +261,9 @@ FF_ENABLE_DEPRECATION_WARNINGS
 
     // Picture control properties
     AMF_ASSIGN_PROPERTY_INT64(res, ctx->encoder, AMF_VIDEO_ENCODER_HEVC_NUM_GOPS_PER_IDR, ctx->gops_per_idr);
+    if (avctx->gop_size != -1) {
         AMF_ASSIGN_PROPERTY_INT64(res, ctx->encoder, AMF_VIDEO_ENCODER_HEVC_GOP_SIZE, avctx->gop_size);
+    }
     if (avctx->slices > 1) {
         AMF_ASSIGN_PROPERTY_INT64(res, ctx->encoder, AMF_VIDEO_ENCODER_HEVC_SLICES_PER_FRAME, avctx->slices);
     }