diff --git a/src/device.c b/src/device.c
index 849c5e4..ecc9cdc 100644
--- a/src/device.c
+++ b/src/device.c
@@ -120,6 +120,7 @@ struct device_t *device_init(void) {
 	dev->standard = V4L2_STD_UNKNOWN;
 	dev->n_buffers = cores_available + 1;
 	dev->n_workers = min_u(cores_available, dev->n_buffers);
+	dev->min_frame_size = 128;
 	dev->timeout = 1;
 	dev->error_delay = 1;
 	dev->io_method = V4L2_MEMORY_MMAP;
diff --git a/src/encoder.c b/src/encoder.c
index b7431dd..9f7b85b 100644
--- a/src/encoder.c
+++ b/src/encoder.c
@@ -201,16 +201,20 @@ int encoder_compress_buffer(struct encoder_t *encoder, struct device_t *dev, uns
 #pragma GCC diagnostic pop
 
 	assert(encoder->run->type != ENCODER_TYPE_UNKNOWN);
+	assert(dev->run->hw_buffers[buf_index].used > 0);
 
 	dev->run->pictures[buf_index]->encode_begin_ts = get_now_monotonic();
 
 	if (encoder->run->type == ENCODER_TYPE_CPU) {
+		LOG_VERBOSE("Compressing buffer %u using CPU", buf_index);
 		cpu_encoder_compress_buffer(dev, buf_index, encoder->run->quality);
 	} else if (encoder->run->type == ENCODER_TYPE_HW) {
+		LOG_VERBOSE("Compressing buffer %u using HW (just copying)", buf_index);
 		hw_encoder_compress_buffer(dev, buf_index);
 	}
 #	ifdef WITH_OMX
 	else if (encoder->run->type == ENCODER_TYPE_OMX) {
+		LOG_VERBOSE("Compressing buffer %u using OMX", buf_index);
 		if (omx_encoder_compress_buffer(encoder->run->omxs[worker_number], dev, buf_index) < 0) {
 			goto error;
 		}
diff --git a/src/encoders/omx/encoder.c b/src/encoders/omx/encoder.c
index db114d1..49a3710 100644
--- a/src/encoders/omx/encoder.c
+++ b/src/encoders/omx/encoder.c
@@ -102,11 +102,11 @@ struct omx_encoder_t *omx_encoder_init(void) {
 
 	LOG_INFO("Initializing OMX encoder ...");
 
-	if (vcos_semaphore_create(&omx->handler_lock, "handler_lock", 0) != VCOS_SUCCESS) {
+	if (vcos_semaphore_create(&omx->handler_sem, "handler_sem", 0) != VCOS_SUCCESS) {
 		LOG_ERROR("Can't create VCOS semaphore");
 		goto error;
 	}
-	omx->i_handler_lock = true;
+	omx->i_handler_sem = true;
 
 	if (_omx_init_component(omx) < 0) {
 		goto error;
@@ -132,8 +132,8 @@ void omx_encoder_destroy(struct omx_encoder_t *omx) {
 	_omx_encoder_clear_ports(omx);
 	component_set_state(&omx->encoder, OMX_StateLoaded);
 
-	if (omx->i_handler_lock) {
-		vcos_semaphore_delete(&omx->handler_lock);
+	if (omx->i_handler_sem) {
+		vcos_semaphore_delete(&omx->handler_sem);
 	}
 
 	if (omx->i_encoder) {
@@ -180,6 +180,7 @@ int omx_encoder_compress_buffer(struct omx_encoder_t *omx, struct device_t *dev,
 #	define OUT(_next)		omx->output_buffer->_next
 
 	OMX_ERRORTYPE error;
+	VCOS_STATUS_T sem_status;
 	size_t slice_size = (IN(nAllocLen) < HW_BUFFER(used) ? IN(nAllocLen) : HW_BUFFER(used));
 	size_t pos = 0;
 
@@ -236,7 +237,13 @@ int omx_encoder_compress_buffer(struct omx_encoder_t *omx, struct device_t *dev,
 			}
 		}
 
-		vcos_semaphore_wait(&omx->handler_lock);
+		// vcos_semaphore_wait(&omx->handler_sem);
+		switch (sem_status = vcos_semaphore_wait_timeout(&omx->handler_sem, 3000)) {
+			case VCOS_SUCCESS: break;
+			case VCOS_EAGAIN: LOG_ERROR("Can't wait VCOS semaphore: EAGAIN (timeout)"); return -1;
+			case VCOS_EINVAL: LOG_ERROR("Can't wait VCOS semaphore: EINTVAL"); return -1;
+			default: LOG_ERROR("Can't wait VCOS semaphore: %d", sem_status); return -1;
+		}
 	}
 
 #	undef OUT
@@ -466,7 +473,7 @@ static OMX_ERRORTYPE _omx_event_handler(
 	if (event == OMX_EventError) {
 		LOG_ERROR_OMX((OMX_ERRORTYPE)data1, "OMX error event received");
 		omx->failed = true;
-		vcos_semaphore_post(&omx->handler_lock);
+		assert(vcos_semaphore_post(&omx->handler_sem) == VCOS_SUCCESS);
 	}
 	return OMX_ErrorNone;
 }
@@ -481,7 +488,7 @@ static OMX_ERRORTYPE _omx_input_required_handler(
 	struct omx_encoder_t *omx = (struct omx_encoder_t *)v_omx;
 
 	omx->input_required = true;
-	vcos_semaphore_post(&omx->handler_lock);
+	assert(vcos_semaphore_post(&omx->handler_sem) == VCOS_SUCCESS);
 	return OMX_ErrorNone;
 }
 
@@ -495,6 +502,6 @@ static OMX_ERRORTYPE _omx_output_available_handler(
 	struct omx_encoder_t *omx = (struct omx_encoder_t *)v_omx;
 
 	omx->output_available = true;
-	vcos_semaphore_post(&omx->handler_lock);
+	assert(vcos_semaphore_post(&omx->handler_sem) == VCOS_SUCCESS);
 	return OMX_ErrorNone;
 }
diff --git a/src/encoders/omx/encoder.h b/src/encoders/omx/encoder.h
index 7d297aa..bc2ca99 100644
--- a/src/encoders/omx/encoder.h
+++ b/src/encoders/omx/encoder.h
@@ -42,9 +42,9 @@ struct omx_encoder_t {
 	bool					input_required;
 	bool					output_available;
 	bool					failed;
-	VCOS_SEMAPHORE_T		handler_lock;
+	VCOS_SEMAPHORE_T		handler_sem;
 
-	bool	i_handler_lock;
+	bool	i_handler_sem;
 	bool	i_encoder;
 	bool	i_input_port_enabled;
 	bool	i_output_port_enabled;
diff --git a/src/options.c b/src/options.c
index e5388ae..0a5cb5b 100644
--- a/src/options.c
+++ b/src/options.c
@@ -339,7 +339,7 @@ int options_parse(struct options_t *options, struct device_t *dev, struct encode
 			case _O_TV_STANDARD:	OPT_PARSE("TV standard", dev->standard, device_parse_standard, STANDARD_UNKNOWN, STANDARDS_STR);
 			case _O_IO_METHOD:		OPT_PARSE("IO method", dev->io_method, device_parse_io_method, IO_METHOD_UNKNOWN, IO_METHODS_STR);
 			case _O_DESIRED_FPS:	OPT_NUMBER("--desired-fps", dev->desired_fps, 0, VIDEO_MAX_FPS, 0);
-			case _O_MIN_FRAME_SIZE:	OPT_NUMBER("--min-frame-size", dev->min_frame_size, 0, 8192, 0);
+			case _O_MIN_FRAME_SIZE:	OPT_NUMBER("--min-frame-size", dev->min_frame_size, 1, 8192, 0);
 			case _O_PERSISTENT:		OPT_SET(dev->persistent, true);
 			case _O_DV_TIMINGS:		OPT_SET(dev->dv_timings, true);
 			case _O_BUFFERS:		OPT_NUMBER("--buffers", dev->n_buffers, 1, 32, 0);
@@ -571,7 +571,7 @@ static void _help(struct device_t *dev, struct encoder_t *encoder, struct http_s
 	printf("                                           Available: %s; default: MMAP\n\n", IO_METHODS_STR);
 	printf("    -f|--desired-fps <N>  ──────────────── Desired FPS. Default: maximum possible.\n\n");
 	printf("    -z|--min-frame-size <N>  ───────────── Drop frames smaller then this limit. Useful if the device\n");
-	printf("                                           produces small-sized garbage frames. Default: disabled.\n\n");
+	printf("                                           produces small-sized garbage frames. Default: %zu bytes.\n\n", dev->min_frame_size);
 	printf("    -n|--persistent  ───────────────────── Don't re-initialize device on timeout. Default: disabled.\n\n");
 	printf("    -t|--dv-timings  ───────────────────── Enable DV timings querying and events processing\n");
 	printf("                                           to automatic resolution change. Default: disabled.\n\n");
diff --git a/src/stream.c b/src/stream.c
index 3df2d31..b783397 100644
--- a/src/stream.c
+++ b/src/stream.c
@@ -449,23 +449,24 @@ static void *_worker_thread(void *v_worker) {
 			GPIO_SET_HIGH_AT(workers_busy_at, worker->number);
 #			endif
 
-			if (encoder_compress_buffer(worker->encoder, worker->dev, worker->number, worker->buf_index) < 0) {
-				worker->job_failed = false;
-			}
+			worker->job_failed = (bool)encoder_compress_buffer(worker->encoder, worker->dev, worker->number, worker->buf_index);
 
 			if (device_release_buffer(worker->dev, worker->buf_index) == 0) {
-				worker->job_start_ts = PICTURE(encode_begin_ts);
-				atomic_store(&worker->has_job, false);
+				if (!worker->job_failed) {
+					worker->job_start_ts = PICTURE(encode_begin_ts);
+					worker->last_comp_time = PICTURE(encode_end_ts) - worker->job_start_ts;
 
-				worker->last_comp_time = PICTURE(encode_end_ts) - worker->job_start_ts;
-
-				LOG_VERBOSE("Compressed new JPEG: size=%zu, time=%0.3Lf, worker=%u, buffer=%u",
-					PICTURE(used), worker->last_comp_time, worker->number, worker->buf_index);
+					LOG_VERBOSE("Compressed new JPEG: size=%zu, time=%0.3Lf, worker=%u, buffer=%u",
+						PICTURE(used), worker->last_comp_time, worker->number, worker->buf_index);
+				} else {
+					LOG_VERBOSE("Compression failed: worker=%u, buffer=%u", worker->number, worker->buf_index);
+				}
 			} else {
 				worker->job_failed = true;
-				atomic_store(&worker->has_job, false);
 			}
 
+			atomic_store(&worker->has_job, false);
+
 #			undef PICTURE
 		}