为什么Read()不在CLI模式下读取帧范围?

这是我的剧本:

# confirming the project dimension resolution
projset = nuke.Root()
projset["format"].setValue("HD_1080")

# load video
foot = nuke.nodes.Read(file="C:/Users/Santosh/Desktop/MVI_8411.MOV", name="Nuke_Class1")

# select read node and attach write node to it
nuke.toNode("Nuke_Class1").setSelected(True)
wr = nuke.createNode("Write")

# specify the sequence path
wr["file"].setValue("C:/Users/Santosh/Desktop/nukke/nuke_API_###.jpg")

# connect to the first viewer, if many
nukescripts.connect_selected_to_viewer(0)

# perform the render, 50th to 140th frame
nuke.render(wr, 50, 140, 1)

问题是,该脚本渲染1帧91次,预期会渲染91个不同的帧。

当我试图调查时,我发现问题在于读取节点。我发现了 帧范围 1. 1.

如何避免手动设置帧范围?