avprobe: Add -show_stream_entry to get a single stream property
This is needed for improved fate testing and it is modeled after
-show_format_entry. The main behavioral difference is that when a print
function is called with an empty key, rather than discarding it, the
closes key in the hierarchy is used instead.
Signed-off-by: NVittorio Giovara <vittorio.giovara@gmail.com>
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