we can select the output directory

v4l2/grabvidseq.c

@@ -58,6 +58,7 @@ void help(int v)
 puts("options :");
 puts("\t-d /dev/?\tselect video device");
 puts("\t-n NNN\t\thow many frames ?");
+puts("\t-O ./\t\tset Output dir");
 puts("\t-p NNN\t\tperiod in seconds");
 puts("\t-v\t\tincrease verbosity");
 exit(0);
@@ -83,12 +84,14 @@ int		period = 10;		/* delai entre les captures */
 int		nbre_capt = 1;		/* nombre de captures */
 int		opt;
 double		t_debut, t_final;
+char		dest_dir = "";		/* must have the trailing slash */
 
-while ((opt = getopt(argc, argv, "d:hn:p:v")) != -1) {
+while ((opt = getopt(argc, argv, "d:hn:O:p:v")) != -1) {
 	switch(opt) {
 		case 'd':	dev_name = optarg;		break;
 		case 'h':	help(0);			break;
 		case 'n':	nbre_capt = atoi(optarg);	break;
+		case 'O':	dest_dir = optarg;		break;
 		case 'p':	period = atoi(optarg);		break;
 		case 'v':	verbosity++;			break;
 		}
@@ -179,7 +182,7 @@ for (i = 0; i < nbre_capt; i++) {
 	buf.memory = V4L2_MEMORY_MMAP;
 	xioctl(fd, VIDIOC_DQBUF, &buf);
 
-	sprintf(out_name, "out%03d.ppm", i);
+	sprintf(out_name, "%s/%05d.ppm", dest_dir, i);
 	if (verbosity) fprintf(stderr, "--> %s\n", out_name);
 
 	fout = fopen(out_name, "w");
@@ -199,7 +202,7 @@ for (i = 0; i < nbre_capt; i++) {
 }
 
 t_final = fimg_timer_get(0);
-fprintf(stderr, "elapsed time %g s.\n", t_final);
+fprintf(stderr, "elapsed time %g s\n", t_final);
 
 type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 xioctl(fd, VIDIOC_STREAMOFF, &type);