use av_opt_set_array to avoid av_get_pix_fmt_name

Author: Daniel Flores

src/torchcodec/_core/FFMPEGCommon.cpp

@@ -397,13 +397,14 @@ AVFilterContext* createBuffersinkFilter(
   if (!sinkContext) {
     return nullptr;
   }
-  // av_opt_set uses the string representation of a pixel format
-  const char* fmt_name = av_get_pix_fmt_name(outputFormat);
-  if (!fmt_name) {
-    return nullptr;
-  }
-  status = av_opt_set(
-      sinkContext, "pixel_formats", fmt_name, AV_OPT_SEARCH_CHILDREN);
+  status = av_opt_set_array(
+      sinkContext,
+      "pixel_formats",
+      AV_OPT_SEARCH_CHILDREN,
+      0, // start_elem
+      1, // nb_elems
+      AV_OPT_TYPE_PIXEL_FMT,
+      &outputFormat);
   if (status < 0) {
     return nullptr;
   }

src/torchcodec/_core/FFMPEGCommon.h

@@ -23,7 +23,6 @@ extern "C" {
 #include <libavutil/display.h>
 #include <libavutil/file.h>
 #include <libavutil/opt.h>
-#include <libavutil/pixdesc.h>
 #include <libavutil/pixfmt.h>
 #include <libavutil/version.h>
 #include <libswresample/swresample.h>