Decode video without needing PID.

I work for a TV News station, and most of the receivers we use will decode video with just the SYM rate, FEC, etc. entered.
No need for the PIDs. This is helpful when different stations uplink on the same transponder, and have different PID settings in their encoders.
Are there any FTA receivers that can do this, or do they all need to 'scan' the transponder before they can decode??

Thanks

John B