fix typos

Author: lieff

minimp4.h

@@ -1226,7 +1226,7 @@ static int mp4e_flush_index(MP4E_mux_t *mux)
     {
         // update size of mdat box.
         // One of 2 points, which requires random file access.
-        // Second is optonal duration update at beginning of file in fragmenatation mode.
+        // Second is optional duration update at beginning of file in fragmentation mode.
         // This can be avoided using "till eof" size code, but in this case indexes must be
         // written before the mdat....
         int64_t size = mux->write_pos - sizeof(box_ftyp);

minimp4_test.c

@@ -229,7 +229,7 @@ int main(int argc, char **argv)
     if (do_demux)
         return demux(alloc_buf, h264_size, fout, track);
 
-    int is_hevc = (0 != strstr(argv[1], "265")) || (0 != strstr(argv[i], "hevc"));
+    int is_hevc = (0 != strstr(argv[i], "265")) || (0 != strstr(argv[i], "hevc"));
 
     MP4E_mux_t *mux;
     mp4_h26x_writer_t mp4wr;