I was wondering whetehr a video card has any role to play in capturing and encoding from a video scource. If so what knid of role apart from monitoring the output in preview
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If the card is a VIVO card and you are using it to capture, then yes, it has a big part to play. If it is just a standard video card and you are using it purely for display, then it has no bearing on the quality of the capture. That said, if it is not properly calibrated (along with your monitor) then you may screw up a good capture by applying poor colour correction or image enhancement because what you saw was wrong.
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The job of the "video" card is to display your desktop and assist with video playback (plus 2D/3D game display). Some cards do more than others. Future cards will be doing considerably more with video. Most cards today offer some support for MPeg playback. Some have full hardware decoders while most will at least assist software decoders with function calls through DirectX.
Next generation display cards will be offering more including full hardware support for MPeg4 playback. http://www.ati.com/technology/H264.html
Capture devices will increasingly include hardware encoding support for MPeg4 as some do today for MPeg2 and DV.Recommends: Kiva.org - Loans that change lives.
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I'm not a genius on this stuff, but the last comment suggests that the video card has something to do with DV capture. DV is already digital and is merely transferred to the computer. There are some cards canopus and hauggpage (sp?) that capture and encode mpeg2 from analog video.
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the last comment suggested nothing of the sort. edDV said that some capture devices, not video cards, have hardware encoding to either mpeg2 or dv. This has nothing to do with "capturing" a DV source, just encoding the source to DV using the capture cards hardware.
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Originally Posted by DokSoulOriginally Posted by greymalkin
Examples for DV: All of these have hardware analog to DV hardware.
Internal: Canopus ADVC 1394, ADVC-50
External: Canopus ADVC-50 to 500, Datavideo DAC-100, ADS Pyro 1394, Pinnacle DV Moviebox, etc. Also, many DV camcorders will function as a hardware analog to DV encoder.
Examples for MPeg2: All of these have hardware analog to MPeg2 hardware.
Internal: Hauppauge PVR-150 up, ATI 550 Pro, or other cards that use the ATI Theater 550, LSI Logic's DVXplore or Conexant’s CX23416 MPeg2 encoding hardware.
External: Hauppauge PVR-USB2, etc.
Then there are the HDTV tuner cards. Although HDTV comes in as a MPeg2_TS stream, many of these cards include MPeg2 hardware DEcoders so that HDTV can be played through a standard display card to the computer monitor. Others use the decoding hardware on the display card or decode in software.Recommends: Kiva.org - Loans that change lives.
http://www.kiva.org/about -
I am not sure, but a cheap video card that shares memory with the main memory might affect capture if you are watching what you capture. THis is because the card would use resources that would be lost to the capture process. But I suspect it is only a problem with low end systems.
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The line between hardware encoders and decoders is being blurred in the latest graphics chipsets because these are also being designed to function in set top boxes and DTV sets. Such devices require both encoding and decoding video (e.g. analog input to DVR storage or analog input to DTV deinterlacers). Many DirectShow DXVA functions can be used to support either decoding or encoding.
Examples:
http://www.ati.com/products/dtv.html
http://forums.divx.com/groupee/forums/a/tpc/f/776104432/m/255101732/r/440106262Recommends: Kiva.org - Loans that change lives.
http://www.kiva.org/about -
Originally Posted by winifreid
High end graphics cards will carry the full display load. Cheap display cards require CPU load. Most capture programs will limit preview display quality to favor CPU encoding.Recommends: Kiva.org - Loans that change lives.
http://www.kiva.org/about
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