IOhannes m zmoelnig wrote:
Mirko Petrovich wrote:
probably your [color]/[colorRGB] is set to black ? (or the alpha-channel is 0 ??) thinking of this, it might be, that the video4linux-driver is able to produce RGBA-images but unfortunately sets the alpha-channel of each pixel to 0. in this case, you will have to raise it manually.
I checked this, and it's not the problem , the strange thing is that alpha works in pix_gray and even in pix_yuv (I get a distorted image, I guess this is right).
this isn't strange as [pix_grey] and [pix_yuv] use colour-spaces that do not have an alpha-channels (so it is automatically set to 1) i still believe that the problem is, that [pix_video] returns RGBA-images with alpha=0 (you could watch this with [pix_histo] furthermore, you can send a [colorspace YUV( or [colorspace GREY( message to [pix_video], which might be faster (depending on the video-capture-device)
Yeah !! now it's working, sending |colorspace 2( to [pix_video] did the trick. Just for the record, I'm using a saa7134 capture card.
Thank you very much, I was really puzzled.