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The filename is freed with the OptionsContext and therefore there will be a use-after-free when reporting the filename in print_stream_maps(). So create a copy of the string. This is a regression since 8aed3911fc454e79697e183660bf30d31334a64b. fate-lavf-mkv_attachment exhibits it (and reports a random nonsense filename here), but this does not make the test fail (not even with valgrind; only with ASAN, as it aborts on use-after-free). Reviewed-by: Anton Khirnov <anton@khirnov.net> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>