How are PATs and PMTs handled at a splice?
The proposed standard does not address these issues, but splicing devices should be careful to avoid creating non-compliant streams. If a splice causes the contents of a transport stream, including the PID values within the transport stream, to change, then the changes must be reflected in valid PSI packets. Splicing devices are responsible for sending any alterations to the PMT required to accommodate changes in the number of PIDs after a splice. However, in order to prevent “commercial killing” devices from taking advantage of changes in PSI, systems with splicing are encouraged to avoid changes to the PMT by reusing existing video and audio PIDs after a splice.
