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For broadcasting with a digital HD source, we generally recommend products from Blackmagic Design
When connecting your equipment to your encoder, select the best available port coming our of your camera and/or video switch. The list below shows video input options in order according to quality (best to worst).
If the best output your equipment has is S-Video or Composite, a high end capture card is not necessary. Typically a very low cost ($15-50) card will give you roughly the same quality as a $1000 card.