Because it doesn't make sense to replace the date placeholder at
process creation, it has to be replaced at every start of the process.
On process creation only the static placeholders (such as process ID)
are replaced. Dynamic placeholders (so far only "date") are not
replaced. On process start, a callback has been introduced that gives
the chance to change the command line. This is the point where
the restreamer replaces the date placeholders.
The progress and probe parser had both their own prelude parsing implementation
in case the json variant is not available. Now there's a new package for this
implementation that both use.
If a program has an ID (in case of srt+mpegts) then this was no recognized by the
parser and these inputs/outputs were not detected.
