Vrec.py: don't print Ids if no frames are captured.

Vrecb.py: use the new interfaces to imageop (fix -M, -m, -g options).

Demo/sgi/video/Vrec.py

@@ -326,6 +326,7 @@ def record(v, info, filename, audiofilename, mono, grey, greybits, \
 		print count*200.0/lastid, '%,',
 		print count*rate*200.0/lastid, '% of wanted rate',
 	print
+	if ids:
 		print 'Ids:',
 		t0 = ids[0]
 		del ids[0]

Demo/sgi/video/Vrecb.py

@@ -245,7 +245,11 @@ def record(v, info, filename, mono, grey, greybits, monotreshold, fields):
 		#
 		# Construct header and write it
 		#
+		try:
 			vout = VFile.VoutFile().init(filename)
+		except IOError, msg:
+			print filename, ':', msg
+			sys.exit(1)
 		if mono:
 			vout.format = 'mono'
 		elif grey and greybits == 8:
@@ -291,13 +295,15 @@ def record(v, info, filename, mono, grey, greybits, monotreshold, fields):
 			start = frameno*fieldsize
 			field = data[start:start+fieldsize]
 			if convertor:
-				field = convertor(field, x, y)
+				field = convertor(field, len(field), 1)
 			elif mono and monotreshold >= 0:
-				field = imageop.grey2mono(field, x, y, \
-					  1, monotreshold)
+				field = imageop.grey2mono( \
+					  field, len(field), 1, monotreshold)
 			elif mono:
-				field = imageop.dither2mono(field, x, y)
+				field = imageop.dither2mono( \
+					  field, len(field), 1)
 			vout.writeframe(int(realframeno*tpf), field, None)
+			realframeno = realframeno + 1
 		print 'Skipped',nskipped,'duplicate frames'
 		vout.close()