FILE *f;
int i;
- f = fopen(filename,"w");
+ f = fopen(filename,"wb");
fprintf(f, "P5\n%d %d\n%d\n", xsize, ysize, 255);
for (i = 0; i < ysize; i++)
fwrite(buf + i * wrap, 1, xsize, f);
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];