I am missing something since:<br><br>gst-launch-0.10 videotestsrc num_buffers=1 pattern=2 ! "video/x-raw-yuv, format=(fourcc)YUY2, width=4, height=4" ! filesink location=black.yuv has the same result<br><br><div class="gmail_quote">
2009/4/27 Julien Isorce <span dir="ltr"><<a href="mailto:julien.isorce@gmail.com">julien.isorce@gmail.com</a>></span><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Hi,<br><br>When I convert a pure black image to yuv using ffmpegcolorspace, then y is equal to 16, u and v are equal to 0.<br> If the input is pure white then y is equal to 251.<br><br>proof:<br>gst-launch-0.10 videotestsrc num_buffers=1 pattern=2 ! "video/x-raw-rgb, bpp=24, depth=24, width=4, height=4" ! ffmpegcolorspace ! "video/x-raw-yuv, format=(fourcc)YUY2" ! filesink location=black.yuv<br>
<br>then hexedit black.yuv -> <br>(y1 u y2 v)<br>10 80 10 80 -> 16 128 16 128<br>10 80 10 80<br>10 80 10 80<br>10 80 10 80<br><br>The 128 is ok but I do not understand why y is equal to 16. Why not 0 ?<br><br>Sincerely<br>
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<br>Julien<br><br><br>
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