v4l2-ctl单帧捕获产生绿色结尾的图像

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我有一个HDMI采集卡，并且正在使用raspbian。

I want to get one single frame with v4l2-ctl command, then convert it to something common:

获取框架：

# v4l2-ctl --device /dev/video0 --stream-mmap --stream-to=frame.raw --stream-count=1

转换它：

# convert -size 1280x720 -depth 16 uyvy:frame.raw frame.png

1280x720 is the resolution what v4l2-ctl --query-dv-timings reports as active.

问题是我无法获得清晰的捕获，它始终在底部有一个绿色结尾（有时更小，有时更大！）：

enter image description here

How can I get the whole picture captured with v4l2-ctl? Maybe the conversion is wrong (I get that from http://trac.gateworks.com/wiki/linux/v4l2).

谢谢！