diff --git a/ddbridge/ddbridge-core.c b/ddbridge/ddbridge-core.c
index 40f7cbc..aeb6c08 100644
--- a/ddbridge/ddbridge-core.c
+++ b/ddbridge/ddbridge-core.c
@@ -281,9 +281,9 @@ static int dma_alloc(struct pci_dev *pdev, struct ddb_dma *dma, int dir)
 	for (i = 0; i < dma->num; i++) {
 		if (alt_dma) {
 #if (KERNEL_VERSION(4, 13, 0) > LINUX_VERSION_CODE)
-			dma->vbuf[i] = kmalloc(dma->size, __GFP_REPEAT);
+			dma->vbuf[i] = kzalloc(dma->size, __GFP_REPEAT);
 #else
-			dma->vbuf[i] = kmalloc(dma->size, __GFP_RETRY_MAYFAIL);
+			dma->vbuf[i] = kzalloc(dma->size, __GFP_RETRY_MAYFAIL);
 #endif
 			if (!dma->vbuf[i])
 				return -ENOMEM;
@@ -301,10 +301,12 @@ static int dma_alloc(struct pci_dev *pdev, struct ddb_dma *dma, int dir)
 			dma->vbuf[i] = dma_alloc_coherent(&pdev->dev,
 							  dma->size,
 							  &dma->pbuf[i],
-							  GFP_KERNEL);
+							  GFP_KERNEL | __GFP_ZERO);
 			if (!dma->vbuf[i])
 				return -ENOMEM;
 		}
+		if (((u64)dma->vbuf[i] & 0xfff))
+			dev_err(&pdev->dev, "DMA memory at %px not aligned!\n", dma->vbuf[i]);
 	}
 	return 0;
 }
@@ -2305,7 +2307,7 @@ static void input_write_dvb(struct ddb_input *input,
 					     dma2->vbuf[dma->cbuf],
 					     dma2->size);
 		} else {
-			if (dma2->vbuf[dma->cbuf][0] != 0x47) {
+			if (dma2->unaligned || (dma2->vbuf[dma->cbuf][0] != 0x47)) {
 				if (!dma2->unaligned) {
 					dma2->unaligned++;
 					dev_warn(dev->dev, "Input %u dma buffer unaligned, "
@@ -2313,7 +2315,7 @@ static void input_write_dvb(struct ddb_input *input,
 						 input->nr);
 					print_hex_dump(KERN_INFO, "TS: ", DUMP_PREFIX_OFFSET, 32, 1,
 						       dma2->vbuf[dma->cbuf],
-						       256, false);
+						       512, false);
 				}
 				dvb_dmx_swfilter(&dvb->demux,
 						 dma2->vbuf[dma->cbuf],