2008-06-16 04:22:25 what's the difference between ITU-R BT.656 and UYVY422

Matthew Wang (CHINA)

Message: 57333

what's the difference between ITU-R BT.656 and UYVY422?

I have read the ITU-R BT.656 standard, and in ITU-R BT.656 fomat , there are some control words and UYVY422,

So, If I could understand that ITU-R BT.656 format is equal to UYVY422 format?

The data from CMOS camera sensor will be transformed to ITU-R BT.656 with TVP5150AM1, then they will be dealed with Video for Linux driver as a result of v4l.yuv. So, if there is some difference between ITU-R BT.656 and UYVY422, then we have to transform ITU-R BT.656 to UYVY422 in v4l driver, don't we ?

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2008-06-16 10:39:16 Re: what's the difference between ITU-R BT.656 and UYVY422

Robin Getz (UNITED STATES)

Message: 57346

Matthew:

My understanding of the v4l framework is that the applicaiton asks the driver for a specific format (<code class="CONSTANT">VIDIOC_TRY_FMT</code> ioctl) If the driver can support it, it provides it.

http://www.linuxtv.org/downloads/video4linux/API/V4L2_API/spec/c830.htm

It doesn't matter what the camera supports - it matters what the application wants.

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2008-06-17 02:49:01 回复： Re: what's the difference between ITU-R BT.656 and UYVY422

Matthew Wang (CHINA)

Message: 57358

thank you, Robin