better error handling, part 28

v4l2/grabvidseq.c

@@ -49,6 +49,7 @@ do {
 
 if (r == -1) {
 	fprintf(stderr, "error %d, %s\n", errno, strerror(errno));
+	sleep(1);
 	exit(EXIT_FAILURE);
 	}
 }
@@ -103,7 +104,7 @@ if (verbosity) {
 
 fd = v4l2_open(dev_name, O_RDWR | O_NONBLOCK, 0);
 if (fd < 0) {
-	perror("Cannot open device");
+	perror(dev_name);
 	exit(EXIT_FAILURE);
 	}