ffmpeg视频裁剪“无法将选项值“”解析为布尔值”

Question

我正在尝试使用以下代码将.mp4视频裁剪为特定大小：

ffmpeg -i INPUT.mp4 -filter:v "crop=900:1000:800:300” OUTPUT.mp4

但是，即使我更改了裁切值，每次也会出现此错误：

[crop @ 0x7f974e8441c0] Unable to parse option value "1000" as boolean
[crop @ 0x7f974e8441c0] Unable to parse option value "800" as boolean
[Parsed_crop_0 @ 0x7f974e8440c0] No option name near '300”'
[AVFilterGraph @ 0x7f974e843dc0] Error initializing filter 'crop' with 
args '900:1000:800:300” out2.mp4
ffmpeg -i INPUT.mp4 -vf crop=900:1000:800:300”'
Error reinitializing filters!
Failed to inject frame into filter network: Invalid argument
Error while processing the decoded data for stream #0:0