if (argc != 2) {
printf("usage: %s output_file\n"
"API example program to output a media file with libavformat.\n"
+ "This program generates a synthetic audio and video stream, encodes and\n"
+ "muxes them into a file named output_file.\n"
"The output format is automatically guessed according to the file extension.\n"
- "Raw images can also be output by using '%%d' in the filename\n"
+ "Raw images can also be output by using '%%d' in the filename.\n"
"\n", argv[0]);
return 1;
}