Depends on Load. Realistically, one of the used "Mini PC's" from Lenovo or HP with an i5 and integrated graphics should be decent for a couple of concurrent streams. They are pretty cheap on ebay. You could even get 3 or 4 and cluster them in some form. But most SBCs won't work too well since transcoding needs a decent GPU of some sort.
Depends on Load. Realistically, one of the used "Mini PC's" from Lenovo or HP with an i5 and integrated graphics should be decent for a couple of concurrent streams. They are pretty cheap on ebay. You could even get 3 or 4 and cluster them in some form. But most SBCs won't work too well since transcoding needs a decent GPU of some sort.