retry on failure to connect to rc-unix socket. Patch by Greg Farrell (greg  a  lincor.com), submitted by Dermot McGahon (dermot  a  dspsrv.com)

(could be improved, but basically works)

   and DTS for field pictures.

   and low delay streams.

   --sout-ts-crypt-video options.

Use str_format_time and str_format_meta here too. Make sure that we only call these functions when needed.

Use str_format_time and str_format_meta in file output. (these are the %char and $char variables defined in marq help)

Allow using format meta stuff in --snapshot-path when defining a filename (see marq help for available variables).