Difference between revisions of "Hardware vs software encoders"

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==Can you get raw video from hardware encoder cards?==
 
==Can you get raw video from hardware encoder cards?==
  
* For card combos where the decoder is on the PCI bus (Conexant Blackbird, Philips Empress, ATI Theatre, etc.), you can grab either the raw video or the compressed (MPEG2) video. These cards register two devices, one for raw video (/dev/video0) and one for compressed (/dev/video1). For this to work you will need the [[http://www.ivtv.tv/ |IVTV]]firmware.
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* For card combos where the decoder is on the PCI bus (Conexant Blackbird, Philips Empress, ATI Theatre, etc.), you can grab either the raw video or the compressed (MPEG2) video. These cards register two devices, one for raw video (/dev/video0) and one for compressed (/dev/video1). For this to work you will need the [http://ivtvdriver.org/ IVTV] firmware.
  
* Cards with the encoder on the PCI bus ([[ivtv_devices |PVR-350/250]], DVB, etc.) only provide compressed streams. This is because the decoder is not accessable on the PCI bus, so you can't grab the raw stream from it.
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* Cards with the encoder on the PCI bus ([[ivtv devices (cx23415, cx23416)|PVR-350/250]], DVB, etc.) only provide compressed streams. This is because the decoder is not accessable on the PCI bus, so you can't grab the raw stream from it.
  
 
* Some cards have MPEG2 in their name, but have no hardware encoder. The card vendor bundles a software decoder (Windows only) with these.
 
* Some cards have MPEG2 in their name, but have no hardware encoder. The card vendor bundles a software decoder (Windows only) with these.
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[[Category:Technology]]

Latest revision as of 02:14, 7 May 2009

Can you get raw video from hardware encoder cards?

  • For card combos where the decoder is on the PCI bus (Conexant Blackbird, Philips Empress, ATI Theatre, etc.), you can grab either the raw video or the compressed (MPEG2) video. These cards register two devices, one for raw video (/dev/video0) and one for compressed (/dev/video1). For this to work you will need the IVTV firmware.
  • Cards with the encoder on the PCI bus (PVR-350/250, DVB, etc.) only provide compressed streams. This is because the decoder is not accessable on the PCI bus, so you can't grab the raw stream from it.
  • Some cards have MPEG2 in their name, but have no hardware encoder. The card vendor bundles a software decoder (Windows only) with these.