pcmrecord --catmode writes error message into stream

[argilo]

If multicast is not enabled on the loopback interface, then pcmrecord --catmode writes an error message to stdout, which gets mixed in with the data stream. (It has an odd number of characters, so it corrupts the samples.) The error messages come from loopback.c, lines 526 and 529:

ka9q-radio/multicast.c

Lines 525 to 529 in 14ac7cf

	if (ioctl(fd, SIOCSIFFLAGS, &ifr) < 0) {
	printf("Can't enable multicast option on loopback interface %s\n",ifr.ifr_name);
	perror("ioctl (set flags)");
	} else {
	printf("Multicast enabled on loopback interface %s\n",ifr.ifr_name);

These messages also corrupt the display of the monitor utility.

[ka9q]

oops, I'll send it to standard error. I thought I'd done that.

ncurses display corruption is hard to fix, it's a longstanding problem. You can always refresh the screen with control-L.