doc/examples/decode_filter_video: switch to new buffersink options

doc/examples/decode_filter_video.c

@@ -99,7 +99,6 @@ static int init_filters(const char *filters_descr)
     AVFilterInOut *outputs = avfilter_inout_alloc();
     AVFilterInOut *inputs  = avfilter_inout_alloc();
     AVRational time_base = fmt_ctx->streams[video_stream_index]->time_base;
-    enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE };
 
     filter_graph = avfilter_graph_alloc();
     if (!outputs || !inputs || !filter_graph) {
@@ -129,8 +128,8 @@ static int init_filters(const char *filters_descr)
         goto end;
     }
 
-    ret = av_opt_set_int_list(buffersink_ctx, "pix_fmts", pix_fmts,
-                              AV_PIX_FMT_NONE, AV_OPT_SEARCH_CHILDREN);
+    ret = av_opt_set(buffersink_ctx, "pixel_formats", "gray8",
+                     AV_OPT_SEARCH_CHILDREN);
     if (ret < 0) {
         av_log(NULL, AV_LOG_ERROR, "Cannot set output pixel format\n");
         goto end;