@Override
          protected Map<String, String> getExtraMapOnSuccess(
              final @Nullable CloseableReference<CloseableImage> result) {
            return ImmutableMap.of(CREATED_THUMBNAIL, String.valueOf(result != null));
          }
A producer that creates video thumbnails.

<p>At present, these thumbnails are created on the java heap rather than being pinned purgeables.
This is deemed okay as the thumbnails are only very small.
imagepipeline/src/main/java/com/facebook/imagepipeline/producers/LocalVideoThumbnailProducer.java