[gst-devel] videoscale fails with v4l2src

[Gabriel Johnson]

Thanks for the reply Zheng,


> Your driver doesn't implement ENUM_FRAMESIZES ioctl, so V4l2Src uses
> v4l2_ioctl (fd, VIDIOC_TRY_FMT, &fmt);
> v4l2_ioctl (fd, VIDIOC_S_FMT, &fmt);
> to probe formats that maybe applied to driver. That may not be accurate if your driver's implementation is not complete or not good.
I was thinking that the v4l2 driver might still be missing something

> V4l2src works well on many other places, so I doubt it's your driver's issue. And perhaps related to your resolution.
>
> Perhaps you could try
> `gst-launch v4l2src ! video/x-raw-rgb,bpp=16,depth=16,width=640,height=480 ! ffmpegcolorspace ! videoscale ! fakesink`
This doesn't work either.

I don't under stand why if I skip using videoscale and
ffmpegcolorspace it works fine.  It appears that if I use any other
plugins between the source and sink it fails.  What could
ffmpegcolorspace or videoscale be requiring from the v4l2src that it
doesn't provide?

I am going to try and implement ENUM_FRAMESIZES ioctl and see if that helps.