diff --git a/v4l2/grabvidseq.c b/v4l2/grabvidseq.c
index 6efeb0a..f82b858 100644
--- a/v4l2/grabvidseq.c
+++ b/v4l2/grabvidseq.c
@@ -35,6 +35,8 @@
 #define SAVE_AS_CUMUL	1
 #define SAVE_AS_FIMG	0
 
+#define NBR_BUFFERS	4
+
 /* --------------------------------------------------------------------- */
 
 #define CLEAR(x) memset(&(x), 0, sizeof(x))
@@ -192,7 +194,7 @@ if ((fmt.fmt.pix.width != width) || (fmt.fmt.pix.height != height)) {
 fprintf(stderr,"--- Ok 1\n");
 
 CLEAR(req);
-req.count = 2;
+req.count = NBR_BUFFERS;
 req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 req.memory = V4L2_MEMORY_MMAP;
 xioctl(fd, VIDIOC_REQBUFS, &req);
@@ -220,7 +222,7 @@ for (n_buffers = 0; n_buffers < req.count; ++n_buffers) {
 
 (void)fimg_timer_set(0);
 
-for (i = 0; i < n_buffers; ++i) {
+for (i = 0; i < NBR_BUFFERS; ++i) {
 	CLEAR(buf);
 	buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 	buf.memory = V4L2_MEMORY_MMAP;
@@ -286,7 +288,10 @@ for (i = 0; i < nbre_capt; i++) {
 	buf.memory = V4L2_MEMORY_MMAP;
 	xioctl(fd, VIDIOC_DQBUF, &buf);
 
-	fprintf(stderr, "xioctl VIDIOC_DQBUF done\n"); fflush(stderr);
+	if(verbosity > 2) {
+		fprintf(stderr, "xioctl VIDIOC_DQBUF done\n");
+		fflush(stderr);
+		}
 
 #if SAVE_AS_CUMUL
 	if (upscaling) {
@@ -403,7 +408,7 @@ fimg_destroy(&cumul);
 
 type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 xioctl(fd, VIDIOC_STREAMOFF, &type);
-for (i = 0; i < n_buffers; ++i) {
+for (i = 0; i < NBR_BUFFERS; ++i) {
 	v4l2_munmap(buffers[i].start, buffers[i].length);
 	}
 
diff --git a/v4l2/notes.txt b/v4l2/notes.txt
index 2cee059..ad23949 100644
--- a/v4l2/notes.txt
+++ b/v4l2/notes.txt
@@ -15,7 +15,7 @@ de capture des images, précisément dans cet appel système :
 	buf.memory = V4L2_MEMORY_MMAP;
 	xioctl(fd, VIDIOC_DQBUF, &buf);
 
-Quand le programme semble figé, un strace -p <pi> sort le même
+Quand le programme semble figé, un strace -p <pid> sort le même
 message en rafale _très_ féroce :
 
 ioctl(3, VIDIOC_DQBUF, {type=V4L2_BUF_TYPE_VIDEO_CAPTURE}) = -1 EAGAIN (Resource temporarily unavailable)