With this commit if tsdecrypt detects that the stream is still
encrypted after passing it through decryption it doesn't output it.

You can enable the output of encrypted streams using --output-enc-pass
option.

This is in preparation for adding --ecm-only and -ecm-and-emm-only
options.

By using this option output can be disabled if there is no currently
received code word.

When the decryption fails due to missing decryption key it is better
to not output anything. Before this patch in case of missing decryption
key the PSI tables were still being written to the output and this
could confuse some monitoring systems to think that the stream is
working.

Use "make ffdecsa" to build tsdecrypt with ffdecsa support
or "make dvbcsa" to build with libdvbcsa (this is still the default).

Without this if the input is MPTS, tsdecrypt incorrectly tries to
decrypt (and brokes) services that do not belong to the chosen
input services. An additional extra is that with this decrypting
a service in MPTS is a lot quicker since lots of unneeded work is
avoided.

When the input is MPTS and output filtering is enabled, rewrite output
PAT to include only the single program that is decoded.