nsub_main: fix output ext detection

diff --git a/src/nsub/nsub_main.c b/src/nsub/nsub_main.c
index 27d4be5528f81bbefe96ebca45d637cc0215e3d2..c11e8b6b46f9605928abea9c8b43f01b629a2bd5 100644 (file)
--- a/src/nsub/nsub_main.c
+++ b/src/nsub/nsub_main.c
@@ -77,7 +77,7 @@ int main(int argc, char **argv) {
                        }
                        out_file = argv[++i];
                        if (to == NSUB_FMT_UNKNOWN) {
-                               char *ext = strrchr(arg, '.');
+                               char *ext = strrchr(argv[i], '.');
                                if (ext) {
                                        ext++;
                                        to = nsub_parse_fmt(ext, 0);