From: Cesar M. <ces...@ig...> - 2007-10-09 17:00:50
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Nice suggestion.. Thanks, will do this now. And for the storage, I am using it. But the raw mode generates about 3 MB per second... too much... Thanks! Cesar Christopher Gilbert wrote: > Have you considered cross-posting these questions to the ffmpeg users > or dev mailing lists? If you explained your situation (400MHz > processor with no floating point and minimal storage) you may be able > to get a better informed suggestion on what codec to use. > > As a side though, have you considered tacking on additional storage? I > used a 512 MB thumbdrive for dropping image files and it worked > fantastically. > > 2007/10/9, Cesar Maciel < ces...@ig... > <mailto:ces...@ig...>>: > > Hi Dave, > Thanks for the answer. By copy, does anyone have experience with > recording video from a webcam? I figured that with ffmpeg and the 400 > MHz board I can get 288x216 at 24fps, but using 99% of the CPU (using > either the mpeg2video or the avi codecs). I tried with rawvideo and > could get 320x240 at 25fps using 40% CPU, but the file size is > enormous. > I am looking for a solution in between.. I don't need the smallest > file > size, and need some moderate CPU utilization. Does anyone have > experience with the ffmpeg codecs and could suggest some codec that > falls between high CPU usage and high disk usage? > > Thanks > Cesar > > Dave Hylands wrote: > > Hi Cesar, > > > > > >> I was able to compile ffmpeg for a verdex board, and was able > to record > >> video from a webcam. However, using ffmpeg to generate > compressed video > >> takes 100% of the CPU. Although this is a CPU intensive task, I was > >> wondering it someone has experience with tuning the compiler > options for > >> better performance, other than the -O3 flag. > >> > > > > The real problem is that ffmpeg is most likely using floating point > > operations, and the PXA255 or PXA270 used in the gumstix has no > > hardware floating point support. > > > > So no amount of optimization will help. You will most likely need to > > change to a codec which uses fixed-point arithmetic instead (and > sorry > > I'm not familiar with any). > > > > > > > > ------------------------------------------------------------------------- > This SF.net email is sponsored by: Splunk Inc. > Still grepping through log files to find problems? Stop. > Now Search log events and configuration files using AJAX and a > browser. > Download your FREE copy of Splunk now >> http://get.splunk.com/ > _______________________________________________ > gumstix-users mailing list > gum...@li... > <mailto:gum...@li...> > https://lists.sourceforge.net/lists/listinfo/gumstix-users > > > > > -- > Christopher Gilbert > B.S., Computer Science > University of Maine 2006 > http://motomastyle.com > ------------------------------------------------------------------------ > > ------------------------------------------------------------------------- > This SF.net email is sponsored by: Splunk Inc. > Still grepping through log files to find problems? Stop. > Now Search log events and configuration files using AJAX and a browser. > Download your FREE copy of Splunk now >> http://get.splunk.com/ > ------------------------------------------------------------------------ > > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users > |