Check supermicro.com. I don't keep up with CPUs that much but I know the quad socket in clonebox2 didn't cost us too much. For sockets with four cores each gives us 16 cpu cores. That machine, with 16 drive trays, probably cost us around $3000. Another of our boxes has a supermicro board with two quad cores.
There are also a number of hardware h.264 encoder and transcoder chips available. Some software such as ffmpeg and Final Cut can use the Maxim MG1264 board, for example, so the hard work of encoding and transcoding is done by a dedicated chip made for that purpose rather than by the CPU.
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