Date: Thu, 11 Oct 2007 12:28:47 +0300 From: Achilleas Mantzios <achill@matrix.gatewaynet.com> To: Mark Tinguely <tinguely@casselton.net> Cc: freebsd-multimedia@freebsd.org Subject: Re: Zoneminder and multichannel cards Message-ID: <200710111228.47687.achill@matrix.gatewaynet.com> In-Reply-To: <200710051443.l95EhAOV066689@casselton.net> References: <200710051443.l95EhAOV066689@casselton.net>
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Just a question, in context with our previous discussions. I managed to capture video from more than 1 camera, in zoneminder. I'd like to ask, whats the theoritical max fps for each of 4 cameras using the bktr driver in its FreeBSD-6.2 state? In my code, with METEOR_CAP_CONTINOUS (single camera) it can do (as ZM reports) 25 fps (which AFAIK is good), whereas with all 4 cameras and by using METEOR_CAP_SINGLE, the fps drop down to 2.5 fps/camera. Is that the max the driver can do, or is my code in trouble? Where is what i do (pseudocode): void initialize() { if (single camera) { c = METEOR_CAP_CONTINOUS; ioctl(m_videohandle, METEORCAPTUR, &c); } } void PreCapture(int channel) { if (number_of_cameras > 1) { /* this runs only when number of cameras are 2 or more */ /*stop continous capture */ int tmpc = METEOR_CAP_STOP_CONT; /*1*/ ioctl(m_videohandle, METEORCAPTUR, &tmpc); /* set the input */ int tmpint=bktr_dev[channel]; /*2*/ ioctl(m_videohandle, METEORSINPUT, &tmpint); /* 3 set single capture mode */ tmpc = METEOR_CAP_SINGLE; /*3*/ ioctl(m_videohandle, METEORCAPTUR, &tmpc); } } The PreCapture method is never called when number_of_cameras > 1. In case (number_of_cameras > 1), the operations "1" and "3" are needed to be run only the first time that capture() is run. Subsequent runs dont need those. Has the above code any flaws? If i try to remove syscalls "1","3" from runs 2,3,4,... whould i have better performance? Any ideas are wellcome. -- Achilleas Mantzios
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