diff --git a/src/libs/common/frame.h b/src/libs/common/frame.h
index a4f3020..9e201e0 100644
--- a/src/libs/common/frame.h
+++ b/src/libs/common/frame.h
@@ -74,3 +74,7 @@ bool frame_compare(const frame_s *a, const frame_s *b);
 unsigned frame_get_padding(const frame_s *frame);
 
 const char *fourcc_to_string(unsigned format, char *buf, size_t size);
+
+inline bool is_jpeg(unsigned format) {
+	return (format == V4L2_PIX_FMT_JPEG || format == V4L2_PIX_FMT_MJPEG);
+}
diff --git a/src/libs/common/unjpeg.c b/src/libs/common/unjpeg.c
index 716e1e2..7789ebf 100644
--- a/src/libs/common/unjpeg.c
+++ b/src/libs/common/unjpeg.c
@@ -34,6 +34,8 @@ static void _jpeg_error_handler(j_common_ptr jpeg);
 
 
 int unjpeg(const frame_s *src, frame_s *dest, bool decode) {
+	assert(is_jpeg(src->format));
+
 	volatile int retval = 0;
 
 	struct jpeg_decompress_struct jpeg;
diff --git a/src/ustreamer/device.c b/src/ustreamer/device.c
index 680b800..c3394aa 100644
--- a/src/ustreamer/device.c
+++ b/src/ustreamer/device.c
@@ -582,7 +582,7 @@ static void _device_open_hw_fps(device_s *dev) {
 static void _device_open_jpeg_quality(device_s *dev) {
 	unsigned quality = 0;
 
-	if (RUN(format) == V4L2_PIX_FMT_MJPEG || RUN(format) == V4L2_PIX_FMT_JPEG) {
+	if (is_jpeg(RUN(format))) {
 		struct v4l2_jpegcompression comp;
 		MEMSET_ZERO(comp);
 
diff --git a/src/ustreamer/encoder.c b/src/ustreamer/encoder.c
index c86553a..0d3ff96 100644
--- a/src/ustreamer/encoder.c
+++ b/src/ustreamer/encoder.c
@@ -96,13 +96,13 @@ void encoder_prepare(encoder_s *enc, device_s *dev) {
 
 	ER(n_workers) = min_u(enc->n_workers, DR(n_buffers));
 
-	if ((DR(format) == V4L2_PIX_FMT_MJPEG || DR(format) == V4L2_PIX_FMT_JPEG) && type != ENCODER_TYPE_HW) {
+	if (is_jpeg(DR(format)) && type != ENCODER_TYPE_HW) {
 		LOG_INFO("Switching to HW encoder: the input is (M)JPEG ...");
 		type = ENCODER_TYPE_HW;
 	}
 
 	if (type == ENCODER_TYPE_HW) {
-		if (DR(format) != V4L2_PIX_FMT_MJPEG && DR(format) != V4L2_PIX_FMT_JPEG) {
+		if (!is_jpeg(DR(format))) {
 			LOG_INFO("Switching to CPU encoder: the input format is not (M)JPEG ...");
 			goto use_cpu;
 		}
diff --git a/src/ustreamer/encoders/hw/encoder.c b/src/ustreamer/encoders/hw/encoder.c
index 73dd611..5c6f332 100644
--- a/src/ustreamer/encoders/hw/encoder.c
+++ b/src/ustreamer/encoders/hw/encoder.c
@@ -33,9 +33,7 @@ static bool _is_huffman(const uint8_t *data);
 
 
 void hw_encoder_compress(const frame_s *src, frame_s *dest) {
-	if (src->format != V4L2_PIX_FMT_MJPEG && src->format != V4L2_PIX_FMT_JPEG) {
-		assert(0 && "Unsupported input format for HW encoder");
-	}
+	assert(is_jpeg(src->format));
 	_copy_plus_huffman(src, dest);
 }
 
diff --git a/src/ustreamer/h264/encoder.c b/src/ustreamer/h264/encoder.c
index a2aa589..1736bee 100644
--- a/src/ustreamer/h264/encoder.c
+++ b/src/ustreamer/h264/encoder.c
@@ -263,7 +263,7 @@ int h264_encoder_compress(h264_encoder_s *enc, const frame_s *src, frame_s *dest
 	dest->format = V4L2_PIX_FMT_H264;
 	dest->stride = 0;
 
-	if (src->format == V4L2_PIX_FMT_MJPEG || src->format == V4L2_PIX_FMT_JPEG) {
+	if (is_jpeg(src->format)) {
 		LOG_DEBUG("H264: Input frame format is JPEG; decoding ...");
 		if (unjpeg(src, RUN(tmp), true) < 0) {
 			return -1;