https://wiki.elphel.com/api.php?action=feedcontributions&feedformat=atom&user=GlassAboutGlass 2026-08-18T15:28:56Z User contributions MediaWiki 1.43.9 https://wiki.elphel.com/index.php?title=Talk:GenReS&diff=1201 2006-12-24T22:12:00Z

<p>GlassAboutGlass: giant glass</p> <hr /> <div>To be really useful for the vidoesecurity applications plugin needs to implement pan (without decoding all the throuwn-away data), not just zoom as we discussed a year ago :-). At least with a step of one macroblock (16x16 pixels with no decimation), and even with JPED DC coefficients are not independent (difference in scan-line order is encoded).<br /> <br /> Of course that will require getting inside the Mplayer to add the additionbal processing, but that is really needed for the multiple cameras applications.<br /> <br /> ----<br /> lowres parameter is passed to mplayer as -lavdopts lowres=&lt;value&gt;.<br /> From man mplayer:<br /> lowres=&lt;number&gt;[,&lt;w&gt;]<br /> Decode at lower resolutions. Low resolution decoding is not supported by all codecs, and it will<br /> often result in ugly artifacts. This is not a bug, but a side effect of not decoding at full reso-<br /> lution.<br /> 0: disabled<br /> 1: 1/2 resolution<br /> 2: 1/4 resolution<br /> 3: 1/8 resolution<br /> I look that with mjpeg it works fine. Decoding with 1/8 resolution needs 1/2 of full decoding time. But 1/16 is not implemented in mplayer.<br /> --[[User:Khlut|Sergey Khlutchin]] 12:34, 20 November 2005 (CST)<br /> <br /> Yes, I understand that Mplayer does not have windowing feature that would allow faster decoding just a selected window from the full frame that is streamed. That will require to get into Mplayer itself - both pass the additional parameters for the window selection and actually implement windoiw processing. But I don't think it is too difficult and we definitely need it.<br /> <br /> Other parameter that we need to pass to plugin - drop specified number of frames (reduce on-screen frame rate) - show each N-th frame. This too will help us to have more active camera preview windows on the same computer. --[[User:Andrey.filippov|Andrey.filippov]] 20:47, 20 November 2005 (CST)<br /> <br /> == giant glass ==<br /> <br /> Glass sculpture by carelessness at heightening public glass house -- <br /> Glass window was a rod pink depression glass, :) <br /> Glass dictionarybe green hand blowng lass. <br /> &lt;a href=http://www.forumprofi2.de/forum5529&gt;hand blowng lass&lt;/a&gt;</div>

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