Nuke thumbnails generated from middle of the sequence

openpype/hosts/nuke/plugins/publish/extract_thumbnail.py

@@ -112,24 +112,26 @@ def render_thumbnail(self, instance):
 
  # create write node
  write_node = nuke.createNode("Write")
- file = fhead + "jpeg"
+ file = fhead + "jpg"
  name = "thumbnail"
  path = os.path.join(staging_dir, file).replace("\\", "/")
  instance.data["thumbnail"] = path
  write_node["file"].setValue(path)
- write_node["file_type"].setValue("jpeg")
+ write_node["file_type"].setValue("jpg")
  write_node["raw"].setValue(1)
  write_node.setInput(0, previous_node)
  temporary_nodes.append(write_node)
  tags = ["thumbnail", "publish_on_farm"]
 
  # retime for
+ mid_frame = int((int(last_frame) - int(first_frame)) / 2) \
+ + int(first_frame)
  first_frame = int(last_frame) / 2
  last_frame = int(last_frame) / 2
 
  repre = {
  'name': name,
- 'ext': "jpeg",
+ 'ext': "jpg",
  "outputName": "thumb",
  'files': file,
  "stagingDir": staging_dir,
@@ -140,7 +142,7 @@ def render_thumbnail(self, instance):
  instance.data["representations"].append(repre)
 
  # Render frames
- nuke.execute(write_node.name(), int(first_frame), int(last_frame))
+ nuke.execute(write_node.name(), int(mid_frame), int(mid_frame))
 
  self.log.debug(
  "representations: {}".format(instance.data["representations"]))