PID in PMT but not present in data stream
We frequently see streams where an audio PID is present in the PMT (say an Audio Described channel) but this PID never appears in the actual data stream. It would be useful to be able to detect that this PID is 'empty' in order to not present it to the user as an option for selecting.
A sample file is attached. Further captures show that the PID can sometimes be present in the data stream, so it would appear that the broadcaster does transmit data in this PID at times.