AVPacket *pkt;
if (argc <= 2) {
- fprintf(stderr, "Usage: %s <input file> <output file>\n", argv[0]);
+ fprintf(stderr, "Usage: %s <input file> <output file>\n"
+ "And check your input file is encoded by mpeg1video please.\n", argv[0]);
exit(0);
}
filename = argv[1];