Hi, Thx for your explanation. <div class="gmail_quote"><div>So a video source at 1080i uses as much bandwith as a video source at 1080p. I believed there was black lines in one interlaced frame and so 1080i was used for lower bandwith. So I do not understand why 1080i still exist because interlacing was iniatilly used for CRT tv to avoid flickering. So what are the reasons to use interlace mode in a full numeric chain ? (source, transport, visual) Then "the NTSC system delivers the rate of 30 frames/s or 60 fields/s", so using deinterlace2, I will get a 60 FPS if fields property is "all", and 30 FPS if "bottom or top". So usually a FULL HD Televisons do deinterlacing using only top/bottom ? What's the most usual deinterlacing method used in FULL HD screens ? Sincerely Julien  </div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> <div><div class="Wj3C7c"> </div></div>It doesn't depend on the deinterlacing method (but some produce a jumping picture if outputting the doubled framerate). The fields property can be used for this, if it's set to all you will get the doubled framerate, top/bottom will only output the interpolated top or bottom field. Let's assume you have a interlaced video (with both fields weaved into one frame) with 30fps. Taking every even line corresponds to one field, every odd line corresponds to the other field then. Now these two fields don't have the exact same timestamp but the second field is 1/2 frame after the first one, i.e. 1/60 second in our example. The fields=all deinterlacing will now output a frame every 1/60 seconds, where every frame is created from the corresponding field and the missing lines are interpolated by some method (which you can choose with the method property). This method could of course be to simply take the missing lines from the previous or following field but there are also some more complex methods ;) ------------------------------------------------------------------------------ SF.Net email is Sponsored by MIX09, March 18-20, 2009 in Las Vegas, Nevada. The future of the web can't happen without you.  Join us at MIX09 to help pave the way to the Next Web now. Learn more and register at <a href="http://ad.doubleclick.net/clk;208669438;13503038;i?http://2009.visitmix.com/" target="_blank">http://ad.doubleclick.net/clk;208669438;13503038;i?http://2009.visitmix.com/</a> _______________________________________________ gstreamer-devel mailing list <a href="mailto:gstreamer-devel@lists.sourceforge.net">gstreamer-devel@lists.sourceforge.net</a> <a href="https://lists.sourceforge.net/lists/listinfo/gstreamer-devel" target="_blank">https://lists.sourceforge.net/lists/listinfo/gstreamer-devel</a> </blockquote></div>