diff --git a/ChangeLog b/ChangeLog
index a25389d..94a677a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -2,3 +2,8 @@
 2021-09-08:
 - grab video from old type of cameras is working
 
+2021-09-15:
+- grab video from cammeras only supporting mjpeg stream
+
+
+
diff --git a/video.cc b/video.cc
index 0ece61b..6dc6312 100644
--- a/video.cc
+++ b/video.cc
@@ -11,7 +11,7 @@
 
 VideoDev videodev;
 GtkWidget *video_da = NULL;
-GdkPixbuf *video_pixbuf;
+GdkPixbuf *video_pixbuf = NULL;
 
 
 
@@ -32,7 +32,6 @@ void videoframe_to_pixbuf(GdkPixbuf* dest, VideoFrame *src) {
 }
 
 
-
 void cb_videoda_draw(GtkWidget *area, cairo_t *cr, int w, int h, gpointer data) {
     if (video_da == NULL) return;
 
@@ -98,7 +97,7 @@ void video_draw_image (VideoFrame *vf) {
 		if (video_pixbuf == NULL || pix_h != vf->h || pix_w != vf->w) {
 			if (video_pixbuf != NULL) g_object_unref (video_pixbuf);
 
-			printf ("%s:%d new pixbuf\n", __FILE__, __LINE__);
+			printf ("%s:%d %s New Pixbuf: %d x %d\n", __FILE__, __LINE__, __FUNCTION__, vf->w, vf->h);
 			video_pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, false, 8, vf->w, vf->h);
 			pix_w = vf->w;
 			pix_h = vf->h;
@@ -172,18 +171,13 @@ void cb_video_btnstop (GtkWidget *widget, gpointer data) {
 
 
 gboolean cb_thread_video (gpointer data) {
-	struct timeval tv;
-	float f;
 	GtkWidget *btnstart;
 	GtkWidget *btnstop;
 	VideoFrame *vf = (VideoFrame *) data;
 
-//	get_cycletime(&tv);
-
 	btnstop = GTK_WIDGET(gtk_builder_get_object (GTK_BUILDER(_builder_), "btn-video-stop"));
 	btnstart = GTK_WIDGET(gtk_builder_get_object (GTK_BUILDER(_builder_), "btn-video-rec"));
 
-
 	if (vf == NULL) {
 		printf ("%s:%d %s something went wrong\n", __FILE__, __LINE__, __FUNCTION__);
 		videodev.Stop();
@@ -191,9 +185,9 @@ gboolean cb_thread_video (gpointer data) {
 		gtk_widget_set_sensitive(btnstart, true);
 		gtk_widget_set_sensitive(btnstop, false);
 	}
+	videodev.LockMutex();
 	video_draw_image(vf);
-
-//	printf ("%s:%d Time for %s ... %f ms\n", __FILE__, __LINE__, __FUNCTION__, get_cycletime(&tv));
+	videodev.UnLockMutex();
 
 	return false;
 };
diff --git a/video.h b/video.h
index 1bc9493..c25ff24 100644
--- a/video.h
+++ b/video.h
@@ -63,7 +63,7 @@ struct {
 	unsigned char *data;
 } typedef VideoFrame;
 
-
+#define VDEV_INBUFFERS 2
 class VideoDev {
 private:
 	std::string conf_device;
@@ -73,10 +73,12 @@ private:
 	GMutex mutex;
 	GThread *thread;
 
-	VideoInBuffer inbuffer;
+	int inbuffer_idx;
+	VideoInBuffer inbuffer[VDEV_INBUFFERS];
 	struct v4l2_cropcap cropcap;
 	struct v4l2_crop crop;
 	struct v4l2_format fmt;
+	VideoFrame vf;
 
 	struct jpg_error_mgr jerr;
 	struct jpeg_decompress_struct cinfo;
@@ -112,6 +114,9 @@ public:
 
 	void PrintCaps (uint32_t caps);
 	void PrintFmt(struct v4l2_format *f);
+
+	void LockMutex();
+	void UnLockMutex();
 };
 
 
diff --git a/videodev.cc b/videodev.cc
index ecc6f56..6534013 100644
--- a/videodev.cc
+++ b/videodev.cc
@@ -76,13 +76,22 @@ gpointer _VideoDevThread (gpointer data) {
 
 
 VideoDev::VideoDev() {
-	inbuffer.size = 0;
-	inbuffer.data = NULL;
+	int i;
+
+	for (i = 0; i < VDEV_INBUFFERS; i++) {
+		inbuffer[i].size = 0;
+		inbuffer[i].data = NULL;
+	}
+	vf.data = NULL;
+	vf.h = 0;
+	vf.w = 0;
+	vf.size = 0;
 	running = 0;
 	callback = NULL;
 	thread = NULL;
 	fd = -1;
 	io = IOMODE_MMAP;
+	inbuffer_idx = 0;
 	CLEAR(cropcap);
 	CLEAR(crop);
 	CLEAR(fmt);
@@ -150,7 +159,7 @@ int VideoDev::Start(std::string dev, gboolean (*callback_func)(gpointer data)) {
 
 int VideoDev::Stop() {
 	if (running == 1) {
-		running = 0;
+		running = 0;		// we can jump directly to 0
 	}
 
 	if (thread) {
@@ -164,26 +173,24 @@ int VideoDev::Stop() {
 
 //
 // try to read a video every 0.05ms (25hz)
+// running = 2 ... thread is running normaly
+// running = 1 ... thread need to close wait for GTK to set running to 0
+// running = 0 ... thread stopped and all handlers can be freed
 //
 #define CYCLETIME 0.050
 void VideoDev::Thread() {
 	struct timeval cycle_timestamp;
 	int lastsec = 0;
-	float cycle_time, cycle_wait;
+	float cycle_time = 0.0;
+	float cycle_wait = 0.0;
 	int i;
-	fd_set fds;
-	struct timeval tv;
-	VideoFrame vf;
 
 	printf ("%s:%d %s Enter\n", __FILE__, __LINE__, __FUNCTION__);
 	cycle_time = get_cycletime(&cycle_timestamp);	// just start counting
 
 	//
 	// open and init device buffers device
-	if (OpenInit() != VDEV_STATUS_OK) {
-		printf ("%s:%d %s something went wrong on Open()\n", __FILE__, __LINE__, __FUNCTION__);
-		running = 0;
-	}
+	if (OpenInit() != VDEV_STATUS_OK) running = 0;
 
 	//
 	// start capturing
@@ -191,7 +198,7 @@ void VideoDev::Thread() {
 
 	//
 	// read untill something bad happens..
-	while (running > 0) {
+	while (running) {
 		i = Grab(&vf);
 
 		switch (i) {
@@ -215,12 +222,13 @@ void VideoDev::Thread() {
 		}
 		if (cycle_wait > 0.0 && cycle_wait < 1.0 ) usleep ((int)(cycle_wait * 1000000.0));
 	}
+
 	//
 	// stop capturing
+	if (callback) gdk_threads_add_idle(callback, NULL);
+
 	CaptureStop();
 	UnInit();
-
-	if (callback) gdk_threads_add_idle(callback, NULL);
 	Close();
 
 	printf ("%s:%d %s Exit\n", __FILE__, __LINE__, __FUNCTION__);
@@ -266,7 +274,7 @@ int VideoDev::Grab(VideoFrame *vf) {
 
 	switch (io) {
 	case IOMODE_READ:
-		if ((len = read (fd, inbuffer.data, fmt.fmt.pix.sizeimage)) == -1) {
+		if ((len = read (fd, inbuffer[0].data, fmt.fmt.pix.sizeimage)) == -1) {
 			switch (errno) {
 				case EAGAIN:
 					return VDEV_STATUS_AGAIN;
@@ -276,8 +284,11 @@ int VideoDev::Grab(VideoFrame *vf) {
 					return VDEV_STATUS_ERROR;
 			}
 		}
-		else
-			Convert(vf, inbuffer.data, len, fmt.fmt.pix.pixelformat, fmt.fmt.pix.width, fmt.fmt.pix.height);
+		else {
+			LockMutex();
+			Convert(vf, inbuffer[0].data, len, fmt.fmt.pix.pixelformat, fmt.fmt.pix.width, fmt.fmt.pix.height);
+			UnLockMutex();
+		}
 		break;
 
 	case IOMODE_MMAP:
@@ -285,7 +296,6 @@ int VideoDev::Grab(VideoFrame *vf) {
 
 		buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 		buf.memory = V4L2_MEMORY_MMAP;
-		buf.index = 0;
 
 		if (-1 == xioctl(fd, VIDIOC_DQBUF, &buf)) {
 			switch (errno) {
@@ -294,19 +304,16 @@ int VideoDev::Grab(VideoFrame *vf) {
 
 				case EIO:
 					printf ( "%s:%d error on VIDIOC_DQBUF EIO %s\n", __FILE__, __LINE__, strerror(errno));
-				/* Could ignore EIO, see spec. */
-				/* fall through */
 				default:
 		            printf ( "%s:%d error on VIDIOC_DQBUF %s\n", __FILE__, __LINE__, strerror(errno));
 		            return VDEV_STATUS_ERROR;
 			}
 		}
 
-//		printf ("%s:%d DQBUF used:%d field:%d flags:%d index:%d len:%d seq:%d mem:%d\n", __FILE__, __LINE__, buf.bytesused, buf.field,
-//				buf.flags, buf.index, buf.length, buf.sequence, buf.memory);
-
-		if (buf.index == 0) {
-			Convert(vf, inbuffer.data, buf.bytesused, fmt.fmt.pix.pixelformat, fmt.fmt.pix.width, fmt.fmt.pix.height);
+		if (buf.index >= 0 && buf.index < VDEV_INBUFFERS) {
+			LockMutex();
+			Convert(vf, inbuffer[buf.index].data, buf.bytesused, fmt.fmt.pix.pixelformat, fmt.fmt.pix.width, fmt.fmt.pix.height);
+			UnLockMutex();
 		}
 
 		if (-1 == xioctl(fd, VIDIOC_QBUF, &buf)) {
@@ -314,8 +321,7 @@ int VideoDev::Grab(VideoFrame *vf) {
            exit (1);
 		}
 
-//		printf ("%s:%d QBUF used:%d field:%d flags:%d index:%d len:%d seq:%d mem:%d\n", __FILE__, __LINE__, buf.bytesused, buf.field,
-//				buf.flags, buf.index, buf.length, buf.sequence, buf.memory);
+		if (++inbuffer_idx >= VDEV_INBUFFERS) inbuffer_idx = 0;
 		break;
 
 	default:
@@ -404,12 +410,10 @@ int VideoDev::OpenInit() {
 
 	CLEAR (fmt);
 	fmt.type                = V4L2_BUF_TYPE_VIDEO_CAPTURE;
-	//	fmt.fmt.pix.width       = cropcap.defrect.width;
-	//	fmt.fmt.pix.height      = cropcap.defrect.height;
 	fmt.fmt.pix.width       = 1920;
 	fmt.fmt.pix.height      = 1080;
-	//	fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_RGB32;
-	fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_MJPEG;
+	fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_RGB32;
+//	fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_MJPEG;
 	fmt.fmt.pix.field       = V4L2_FIELD_NONE;
 
 	if (-1 == xioctl (fd, VIDIOC_S_FMT, &fmt)) {
@@ -449,10 +453,12 @@ int VideoDev::InitMMap() {
     struct v4l2_buffer bufinfo;
 	printf ("%s:%d %s\n", __FILE__, __LINE__, __FUNCTION__);
 
+	int i;
+
     CLEAR(bufreq);
     CLEAR(bufinfo);
 
-    bufreq.count = 1;
+    bufreq.count = VDEV_INBUFFERS;
     bufreq.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
     bufreq.memory = V4L2_MEMORY_MMAP;
 
@@ -472,24 +478,25 @@ int VideoDev::InitMMap() {
             return VDEV_STATUS_ERROR;
     }
 
-	CLEAR(bufinfo);
-
-	bufinfo.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
-	bufinfo.memory = V4L2_MEMORY_MMAP;
-	bufinfo.index = 0;
-
-	if(ioctl(fd, VIDIOC_QUERYBUF, &bufinfo) < 0){
-	    perror("VIDIOC_QUERYBUF");
-	    exit(1);
-	}
+    for (i = 0; i < VDEV_INBUFFERS; i++) {
+		CLEAR(bufinfo);
+		bufinfo.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+		bufinfo.memory = V4L2_MEMORY_MMAP;
+		bufinfo.index = i;
 
-	inbuffer.size = bufinfo.length;
-    inbuffer.data = (unsigned char*)mmap(NULL, bufinfo.length, PROT_READ | PROT_WRITE, MAP_SHARED, fd, bufinfo.m.offset);
-	if (inbuffer.data == MAP_FAILED) {
-        printf ( "%s:%d error on mmap %s\n", __FILE__, __LINE__, strerror(errno));
-        exit (1);
-	}
+		if(ioctl(fd, VIDIOC_QUERYBUF, &bufinfo) < 0){
+			perror("VIDIOC_QUERYBUF");
+			exit(1);
+		}
 
+		inbuffer[i].size = bufinfo.length;
+		inbuffer[i].data = (unsigned char*)mmap(NULL, bufinfo.length, PROT_READ | PROT_WRITE,
+				MAP_SHARED, fd, bufinfo.m.offset);
+		if (inbuffer[i].data == MAP_FAILED) {
+			printf ( "%s:%d error on mmap %s\n", __FILE__, __LINE__, strerror(errno));
+			exit (1);
+		}
+    }
     return VDEV_STATUS_OK;
 }
 
@@ -508,17 +515,20 @@ int VideoDev::CaptureStart() {
 
 	case IOMODE_MMAP:
 		struct v4l2_buffer buf;
-		CLEAR(buf);
 
-		buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
-		buf.memory = V4L2_MEMORY_MMAP;
-		buf.index = 0;
+		for (inbuffer_idx = 0; inbuffer_idx < VDEV_INBUFFERS; inbuffer_idx++) {
+			CLEAR(buf);
+			buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+			buf.memory = V4L2_MEMORY_MMAP;
+			buf.index = inbuffer_idx;
 
-		if (-1 == xioctl(fd, VIDIOC_QBUF, &buf)) {
-           printf ( "%s:%d error on VIDIOC_QBUF %s\n", __FILE__, __LINE__, strerror(errno));
-           exit (1);
+			if (-1 == xioctl(fd, VIDIOC_QBUF, &buf)) {
+			   printf ( "%s:%d error on VIDIOC_QBUF %s\n", __FILE__, __LINE__, strerror(errno));
+			   return VDEV_STATUS_ERROR;
+			}
 		}
 
+		inbuffer_idx = 0;
 		type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 		if (-1 == xioctl(fd, VIDIOC_STREAMON, &type)) {
 			printf ( "%s:%d VIDIOC_STREAMON %s\n", __FILE__, __LINE__, strerror(errno));
@@ -532,16 +542,6 @@ int VideoDev::CaptureStart() {
 	}
 
 	if (fmt.fmt.pix.pixelformat == V4L2_PIX_FMT_MJPEG) {
-		cinfo.err = jpeg_std_error(&jerr.pub);
-		jerr.pub.error_exit = jpg_error_exit;
-		if (setjmp(jerr.setjmp_buffer)) {
-		    /* If we get here, the JPEG code has signaled an error.
-		     * We need to clean up the JPEG object, close the input file, and return.
-		     */
-			printf ("%s:%d %s JPEG Error\n", __FILE__, __LINE__, __FUNCTION__);
-		    jpeg_destroy_decompress(&cinfo);
-		    return VDEV_STATUS_ERROR;
-		}
 		jpeg_create_decompress(&cinfo);
 	}
 
@@ -584,10 +584,15 @@ int VideoDev::UnInit() {
     	break;
 
     case IOMODE_MMAP:
-   		if (-1 == munmap(inbuffer.data, inbuffer.size)){
-   	    	fprintf(stderr, "Fatal Error @ %s:%d munmap Error:%s\n", __FILE__, __LINE__, strerror(errno));
-   	    	exit(1);
-   		}
+    	for (inbuffer_idx = 0; inbuffer_idx < VDEV_INBUFFERS; inbuffer_idx++)
+    		if (inbuffer[inbuffer_idx].data) {
+				if (-1 == munmap(inbuffer[inbuffer_idx].data, inbuffer[inbuffer_idx].size)){
+					fprintf(stderr, "Fatal Error @ %s:%d munmap Error:%s\n", __FILE__, __LINE__, strerror(errno));
+					exit(1);
+				}
+				inbuffer[inbuffer_idx].data = NULL;
+				inbuffer[inbuffer_idx].size = 0;
+    		}
     	break;
 
 	default:
@@ -661,7 +666,7 @@ int VideoDev::Convert (VideoFrame *dest, unsigned char *ptrsrc, int srcsize, uin
 
 	if (dest->data != NULL && dest->w != srcw && dest->h != srch) {
 		free (dest->data);
-		dest->data == NULL;
+		dest->data = NULL;
 	}
 
 	if (dest->data == NULL) {
@@ -799,6 +804,14 @@ int VideoDev::Convert (VideoFrame *dest, unsigned char *ptrsrc, int srcsize, uin
 		break;
 
 	case (V4L2_PIX_FMT_MJPEG):
+		cinfo.err = jpeg_std_error(&jerr.pub);
+		jerr.pub.error_exit = jpg_error_exit;
+		if (setjmp(jerr.setjmp_buffer)) {
+			// jpeg data and allocations will be destroyed via StopCapture.
+			printf ("%s:%d %s JPEG Error\n", __FILE__, __LINE__, __FUNCTION__);
+			return VDEV_STATUS_ERROR;
+		}
+
 	    jpeg_mem_src(&cinfo, ptrsrc, srcsize);
 	    jpeg_read_header(&cinfo, TRUE);
 	    jpeg_start_decompress(&cinfo);
@@ -818,3 +831,15 @@ int VideoDev::Convert (VideoFrame *dest, unsigned char *ptrsrc, int srcsize, uin
 	return VDEV_STATUS_OK;
 };
 
+
+void VideoDev::LockMutex() {
+	g_mutex_lock(&mutex);
+};
+
+
+void VideoDev::UnLockMutex() {
+	g_mutex_unlock(&mutex);
+};
+
+
+