<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta content="text/html;charset=ISO-8859-1" http-equiv="Content-Type"> </head> <body bgcolor="#ffffff" text="#000000"> <a href="http://msdn.microsoft.com/en-us/library/ms893078.aspx">http://msdn.microsoft.com/en-us/library/ms893078.aspx</a> or <a href="http://en.wikipedia.org/wiki/YUV">http://en.wikipedia.org/wiki/YUV</a> - more complex Julien Isorce wrote: <blockquote cite="mid:180a127d0904270612l3c021151xd425b92cfaf57af0@mail.gmail.com" type="cite">Hi, When I convert a pure black image to yuv using ffmpegcolorspace, then y is equal to 16, u and v are equal to 0.  If the input is pure white then y is equal to 251. proof: 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 then hexedit black.yuv -> (y1 u y2 v) 10 80 10 80 ->  16 128 16 128 10 80 10 80 10 80 10 80 10 80 10 80 The 128 is ok but I do not understand why y is equal to 16. Why not 0 ? Sincerely Julien <pre wrap=""> <hr size="4" width="90%"> ------------------------------------------------------------------------------ Crystal Reports &#45; New Free Runtime and 30 Day Trial Check out the new simplified licensign option that enables unlimited royalty&#45;free distribution of the report engine for externally facing server and web deployment. <a class="moz-txt-link-freetext" href="http://p.sf.net/sfu/businessobjects">http://p.sf.net/sfu/businessobjects</a></pre> <pre wrap=""> <hr size="4" width="90%"> _______________________________________________ gstreamer-devel mailing list <a class="moz-txt-link-abbreviated" href="mailto:gstreamer-devel@lists.sourceforge.net">gstreamer-devel@lists.sourceforge.net</a> <a class="moz-txt-link-freetext" href="https://lists.sourceforge.net/lists/listinfo/gstreamer-devel">https://lists.sourceforge.net/lists/listinfo/gstreamer-devel</a> </pre> </blockquote> </body> </html>