ffmpeg-devel

with use_localtime parameter hlsenc may produce identical filenames for
different but still existing segments. It happens when
hls_segment_filename contains
syntacticaly correct but inadequate format parameters. Currently there
is no any log message when such a situaton occurs but these cases should
be avoided in most times. This patch generate warning log messages in
these cases.

ticketID: #6043
Signed-off-by: Bela Bodecs <bodecsb@vivanet.hu>
Signed-off-by: Steven Liu <lingjiujianke@gmail.com>