Capture video and stream

[ronts]

How can I capture a video from a video card (for example, a Blackmagic card), and then stream it to some kind of server for distribution? I prefer it to encode to MPEG-4 H264.

Thanks.

[edDV]

What is the video source?

Stream SD like Ustream?

[ronts]

The video source is a Blackmagic card or any other DVB-S card (I don't care to buy one).

I want it to capture the video feed from the card and then encode it to MPEG-4 H264. Right now, I need it in normal SD.

[edDV]

Consider the Black Magic ATEM Television Studio which takes HDMI or SDI in and hardware encodes to h.264.
http://www.blackmagic-design.com/products/atemtelevisionstudio/
http://www.blackmagic-design.com/media/1528565/ATEM_Operation_Manual.pdf

This could then feed a Viewcast Niagara or Telestream Wirecast software for stream upload to a service like Justin TV.
http://www.viewcast.com/products/niagara-systems
http://www.telestream.net/wire-cast/overview.htm

Or you could just feed DV over IEEE-1394 (Firewire) direct to the Wirecast software.
http://www.telestream.net/wire-cast/features.htm

[ronts]

Can't I do it with FFmpeg or similar software? I prefer it because the source will probably be satellite feed (using DVB-S card).