diff --git a/device/buffer_lock.c b/device/buffer_lock.c
index 3a92acc..73138e5 100644
--- a/device/buffer_lock.c
+++ b/device/buffer_lock.c
@@ -34,6 +34,9 @@ bool buffer_lock_needs_buffer(buffer_lock_t *buf_lock)
   if (buf_lock->refs > 0) {
     needs_buffer = true;
   }
+  for (int i = 0; !needs_buffer && buf_lock->notify_buffer[i] && i < BUFFER_LOCK_MAX_CALLBACKS; i++) {
+    needs_buffer = buf_lock->check_streaming[i](buf_lock);
+  }
   pthread_mutex_unlock(&buf_lock->lock);
 
   return needs_buffer;
@@ -67,6 +70,10 @@ void buffer_lock_capture(buffer_lock_t *buf_lock, buffer_t *buf)
       (now - buf_lock->buf_time_us) / 1000.0f);
     buf_lock->buf_time_us = now;
     pthread_cond_broadcast(&buf_lock->cond_wait);
+
+    for (int i = 0; buf_lock->notify_buffer[i] && i < BUFFER_LOCK_MAX_CALLBACKS; i++) {
+      buf_lock->notify_buffer[i](buf_lock, buf);
+    }
   }
 
   pthread_mutex_unlock(&buf_lock->lock);
@@ -135,3 +142,37 @@ error:
   buffer_lock_use(buf_lock, -1);
   return -frames;
 }
+
+bool buffer_lock_register_check_streaming(buffer_lock_t *buf_lock, buffer_lock_check_streaming check_streaming)
+{
+  bool ret = false;
+
+  pthread_mutex_lock(&buf_lock->lock);
+  for (int i = 0; i < BUFFER_LOCK_MAX_CALLBACKS; i++) {
+    if (!buf_lock->check_streaming[i]) {
+      buf_lock->check_streaming[i] = check_streaming;
+      ret = true;
+      break;
+    }
+  }
+  pthread_mutex_unlock(&buf_lock->lock);
+
+  return ret;
+}
+
+bool buffer_lock_register_notify_buffer(buffer_lock_t *buf_lock, buffer_lock_notify_buffer notify_buffer)
+{
+  bool ret = false;
+
+  pthread_mutex_lock(&buf_lock->lock);
+  for (int i = 0; i < BUFFER_LOCK_MAX_CALLBACKS; i++) {
+    if (!buf_lock->notify_buffer[i]) {
+      buf_lock->notify_buffer[i] = notify_buffer;
+      ret = true;
+      break;
+    }
+  }
+  pthread_mutex_unlock(&buf_lock->lock);
+
+  return ret;
+}
diff --git a/device/buffer_lock.h b/device/buffer_lock.h
index de49819..33b44a4 100644
--- a/device/buffer_lock.h
+++ b/device/buffer_lock.h
@@ -5,9 +5,22 @@
 #include <pthread.h>
 
 typedef struct buffer_s buffer_t;
+typedef struct buffer_list_s buffer_list_t;
+typedef struct buffer_lock_s buffer_lock_t;
+
+typedef bool (*buffer_lock_check_streaming)(buffer_lock_t *buf_lock);
+typedef void (*buffer_lock_notify_buffer)(buffer_lock_t *buf_lock, buffer_t *buf);
+
+#define BUFFER_LOCK_MAX_CALLBACKS 10
 
 typedef struct buffer_lock_s {
   const char *name;
+  buffer_list_t *buf_list;
+
+  buffer_lock_check_streaming check_streaming[BUFFER_LOCK_MAX_CALLBACKS];
+  buffer_lock_notify_buffer notify_buffer[BUFFER_LOCK_MAX_CALLBACKS];
+
+  // private
   pthread_mutex_t lock;
   pthread_cond_t cond_wait;
   buffer_t *buf;
@@ -40,3 +53,5 @@ bool buffer_lock_needs_buffer(buffer_lock_t *buf_lock);
 void buffer_lock_use(buffer_lock_t *buf_lock, int ref);
 bool buffer_lock_is_used(buffer_lock_t *buf_lock);
 int buffer_lock_write_loop(buffer_lock_t *buf_lock, int nframes, buffer_write_fn fn, void *data);
+bool buffer_lock_register_check_streaming(buffer_lock_t *buf_lock, buffer_lock_check_streaming check_streaming);
+bool buffer_lock_register_notify_buffer(buffer_lock_t *buf_lock, buffer_lock_notify_buffer notify_buffer);
diff --git a/device/camera/camera.c b/device/camera/camera.c
index 323244a..ea6af1a 100644
--- a/device/camera/camera.c
+++ b/device/camera/camera.c
@@ -3,6 +3,7 @@
 #include "device/device.h"
 #include "device/device_list.h"
 #include "device/buffer_list.h"
+#include "device/buffer_lock.h"
 #include "device/links.h"
 #include "util/opts/log.h"
 #include "util/opts/fourcc.h"
@@ -82,6 +83,10 @@ void camera_capture_set_callbacks(camera_t *camera, buffer_list_t *capture, link
 {
   link_t *link = camera_ensure_capture(camera, capture);
   link->callbacks = callbacks;
+
+  if (callbacks.buf_lock) {
+    callbacks.buf_lock->buf_list = capture;
+  }
 }
 
 int camera_set_params(camera_t *camera)
diff --git a/device/camera/camera_output.c b/device/camera/camera_output.c
index 68dbd3d..aa6d6ee 100644
--- a/device/camera/camera_output.c
+++ b/device/camera/camera_output.c
@@ -18,8 +18,8 @@ static const char *jpeg_names[2] = {
 };
 
 static link_callbacks_t jpeg_callbacks[2] = {
-  { "JPEG-CAPTURE", http_jpeg_capture, http_jpeg_needs_buffer },
-  { "JPEG-LOW-CAPTURE", http_jpeg_lowres_capture, http_jpeg_needs_buffer }
+  { .name = "JPEG-CAPTURE", .buf_lock = &http_jpeg },
+  { .name = "JPEG-LOW-CAPTURE", .buf_lock = &http_jpeg_lowres }
 };
 
 static const char *h264_names[2] = {
@@ -27,26 +27,9 @@ static const char *h264_names[2] = {
   "H264-LOW"
 };
 
-static void h264_capture(buffer_t *buf)
-{
-  http_h264_capture(buf);
-  rtsp_h264_capture(buf);
-}
-
-static void h264_lowres_capture(buffer_t *buf)
-{
-  http_h264_lowres_capture(buf);
-  rtsp_h264_low_res_capture(buf);
-}
-
-static bool h264_needs_buffer()
-{
-  return http_h264_needs_buffer() | rtsp_h264_needs_buffer();
-}
-
 static link_callbacks_t h264_callbacks[2] = {
-  { "H264-CAPTURE", h264_capture, h264_needs_buffer },
-  { "H264-LOW-CAPTURE", h264_lowres_capture, h264_needs_buffer }
+  { .name = "H264-CAPTURE", .buf_lock = &http_h264 },
+  { .name = "H264-LOW-CAPTURE", .buf_lock = &http_h264_lowres }
 };
 
 static int camera_configure_h264_output(camera_t *camera, buffer_list_t *src_capture, int res)
diff --git a/device/links.c b/device/links.c
index 5779dd4..96d010e 100644
--- a/device/links.c
+++ b/device/links.c
@@ -2,6 +2,7 @@
 #include "device/device.h"
 #include "device/buffer.h"
 #include "device/buffer_list.h"
+#include "device/buffer_lock.h"
 #include "util/opts/log.h"
 #include "util/opts/fourcc.h"
 
@@ -34,6 +35,10 @@ int _build_fds(link_t *all_links, struct pollfd *fds, link_t **links, buffer_lis
       paused = false;
     }
 
+    if (link->callbacks.buf_lock && buffer_lock_needs_buffer(link->callbacks.buf_lock)) {
+      paused = false;
+    }
+
     for (int j = 0; link->sinks[j]; j++) {
       buffer_list_t *sink = link->sinks[j];
 
@@ -107,6 +112,10 @@ int links_enqueue_from_source(buffer_list_t *buf_list, link_t *link)
     link->callbacks.on_buffer(buf);
   }
 
+  if (link->callbacks.buf_lock) {
+    buffer_lock_capture(link->callbacks.buf_lock, buf);
+  }
+
   return 0;
 
 error:
@@ -296,10 +305,10 @@ void links_dump(link_t *all_links)
       links_dump_buf_list(line, link->sinks[j]);
     }
 
-    if (link->callbacks.callback_name) {
+    if (link->callbacks.name) {
       if (link->sinks[0])
         strcat(line, ", ");
-      strcat(line, link->callbacks.callback_name);
+      strcat(line, link->callbacks.name);
     }
     strcat(line, "]");
 
diff --git a/device/links.h b/device/links.h
index f750544..732daa4 100644
--- a/device/links.h
+++ b/device/links.h
@@ -7,6 +7,7 @@
 
 typedef struct buffer_s buffer_t;
 typedef struct buffer_list_s buffer_list_t;
+typedef struct buffer_lock_s buffer_lock_t;
 typedef struct link_s link_t;
 
 typedef void (*link_on_buffer)(buffer_t *buf);
@@ -14,10 +15,11 @@ typedef bool (*link_check_streaming)();
 typedef bool (*link_validate_buffer)(struct link_s *link, buffer_t *buf);
 
 typedef struct link_callbacks_s {
-  const char *callback_name;
+  const char *name;
   link_on_buffer on_buffer;
   link_check_streaming check_streaming;
   link_validate_buffer validate_buffer;
+  buffer_lock_t *buf_lock;
 } link_callbacks_t;
 
 typedef struct link_s {
diff --git a/output/http_h264.c b/output/http_h264.c
index 2d04157..529e47d 100644
--- a/output/http_h264.c
+++ b/output/http_h264.c
@@ -9,9 +9,6 @@
 #include "device/buffer_list.h"
 #include "device/device.h"
 
-DEFINE_BUFFER_LOCK(http_h264, 0);
-DEFINE_BUFFER_LOCK(http_h264_lowres, 0);
-
 static const char *const VIDEO_HEADER =
   "HTTP/1.0 200 OK\r\n"
   "Access-Control-Allow-Origin: *\r\n"
@@ -19,24 +16,9 @@ static const char *const VIDEO_HEADER =
   "Content-Type: application/octet-stream\r\n"
   "\r\n";
 
-void http_h264_capture(buffer_t *buf)
-{
-  buffer_lock_capture(&http_h264, buf);
-}
-
-void http_h264_lowres_capture(buffer_t *buf)
-{
-  buffer_lock_capture(&http_h264_lowres, buf);
-}
-
-bool http_h264_needs_buffer()
-{
-  return buffer_lock_needs_buffer(&http_h264) | buffer_lock_needs_buffer(&http_h264_lowres);
-}
-
 buffer_lock_t *http_h264_buffer_for_res(http_worker_t *worker)
 {
-  if (strstr(worker->client_method, HTTP_LOW_RES_PARAM))
+  if (strstr(worker->client_method, HTTP_LOW_RES_PARAM) && http_jpeg_lowres.buf_list)
     return &http_h264_lowres;
   else
     return &http_h264;
diff --git a/output/http_jpeg.c b/output/http_jpeg.c
index 918ce14..e20fbdd 100644
--- a/output/http_jpeg.c
+++ b/output/http_jpeg.c
@@ -6,9 +6,6 @@
 #include "device/buffer.h"
 #include "device/buffer_lock.h"
 
-DEFINE_BUFFER_LOCK(http_jpeg, 1000);
-DEFINE_BUFFER_LOCK(http_jpeg_lowres, 1000);
-
 #define PART_BOUNDARY "123456789000000000000987654321"
 #define CONTENT_TYPE "image/jpeg"
 #define CONTENT_LENGTH "Content-Length"
@@ -23,24 +20,9 @@ static const char *const STREAM_PART = "Content-Type: " CONTENT_TYPE "\r\n" CONT
 static const char *const STREAM_BOUNDARY = "\r\n"
                                            "--" PART_BOUNDARY "\r\n";
 
-bool http_jpeg_needs_buffer()
-{
-  return buffer_lock_needs_buffer(&http_jpeg) | buffer_lock_needs_buffer(&http_jpeg_lowres);
-}
-
-void http_jpeg_capture(buffer_t *buf)
-{
-  buffer_lock_capture(&http_jpeg, buf);
-}
-
-void http_jpeg_lowres_capture(buffer_t *buf)
-{
-  buffer_lock_capture(&http_jpeg_lowres, buf);
-}
-
 buffer_lock_t *http_jpeg_buffer_for_res(http_worker_t *worker)
 {
-  if (strstr(worker->client_method, HTTP_LOW_RES_PARAM))
+  if (strstr(worker->client_method, HTTP_LOW_RES_PARAM) && http_jpeg_lowres.buf_list)
     return &http_jpeg_lowres;
   else
     return &http_jpeg;
diff --git a/output/output.c b/output/output.c
new file mode 100644
index 0000000..5f84c35
--- /dev/null
+++ b/output/output.c
@@ -0,0 +1,7 @@
+#include "device/buffer_lock.h"
+
+DEFINE_BUFFER_LOCK(http_h264, 0);
+DEFINE_BUFFER_LOCK(http_h264_lowres, 0);
+
+DEFINE_BUFFER_LOCK(http_jpeg, 1000);
+DEFINE_BUFFER_LOCK(http_jpeg_lowres, 1000);
diff --git a/output/output.h b/output/output.h
index ef6c68c..f336ee6 100644
--- a/output/output.h
+++ b/output/output.h
@@ -5,20 +5,20 @@
 struct http_worker_s;
 struct buffer_s;
 
+extern struct buffer_lock_s http_h264;
+extern struct buffer_lock_s http_h264_lowres;
+
+extern struct buffer_lock_s http_jpeg;
+extern struct buffer_lock_s http_jpeg_lowres;
+
 // M-JPEG
 void http_snapshot(struct http_worker_s *worker, FILE *stream);
 void http_stream(struct http_worker_s *worker, FILE *stream);
-void http_jpeg_capture(struct buffer_s *buf);
-void http_jpeg_lowres_capture(struct buffer_s *buf);
-bool http_jpeg_needs_buffer();
 void http_option(struct http_worker_s *worker, FILE *stream);
 
 // H264
-bool http_h264_needs_buffer();
-void http_h264_capture(struct buffer_s *buf);
-void http_h264_lowres_capture(struct buffer_s *buf);
-void http_h264_video(struct http_worker_s *worker, FILE *stream);
 bool h264_is_key_frame(struct buffer_s *buf);
+void http_h264_video(struct http_worker_s *worker, FILE *stream);
 void http_mkv_video(struct http_worker_s *worker, FILE *stream);
 void http_mp4_video(struct http_worker_s *worker, FILE *stream);
 void http_mov_video(struct http_worker_s *worker, FILE *stream);
diff --git a/output/rtsp/rtsp.cc b/output/rtsp/rtsp.cc
index de28a1d..a9d4ea0 100644
--- a/output/rtsp/rtsp.cc
+++ b/output/rtsp/rtsp.cc
@@ -3,6 +3,7 @@ extern "C" {
 #include "util/http/http.h"
 #include "device/buffer.h"
 #include "device/buffer_list.h"
+#include "device/buffer_lock.h"
 #include "device/device.h"
 #include "util/opts/log.h"
 #include "util/opts/fourcc.h"
@@ -204,6 +205,33 @@ static void *rtsp_server_thread(void *opaque)
   return NULL;
 }
 
+static bool rtsp_h264_needs_buffer(buffer_lock_t *buf_lock)
+{
+  return rtsp_streams != NULL;
+}
+
+static void rtsp_h264_capture(buffer_lock_t *buf_lock, buffer_t *buf)
+{
+  pthread_mutex_lock(&rtsp_lock);
+  for (DynamicH264Stream *stream = rtsp_streams; stream; stream = stream->pNextStream) {
+    stream->receiveData(buf, false);
+
+    if (!http_h264_lowres.buf_list) {
+      stream->receiveData(buf, true);
+    }
+  }
+  pthread_mutex_unlock(&rtsp_lock);
+}
+
+static void rtsp_h264_low_res_capture(buffer_lock_t *buf_lock, buffer_t *buf)
+{
+  pthread_mutex_lock(&rtsp_lock);
+  for (DynamicH264Stream *stream = rtsp_streams; stream; stream = stream->pNextStream) {
+    stream->receiveData(buf, true);
+  }
+  pthread_mutex_unlock(&rtsp_lock);
+}
+
 extern "C" int rtsp_server(rtsp_options_t *options)
 {
   // Begin by setting up our usage environment:
@@ -234,6 +262,11 @@ extern "C" int rtsp_server(rtsp_options_t *options)
   //   LOG_INFO(NULL, "The RTSP-over-HTTP is not available.");
   // }
 
+  buffer_lock_register_check_streaming(&http_h264, rtsp_h264_needs_buffer);
+  buffer_lock_register_notify_buffer(&http_h264, rtsp_h264_capture);
+  buffer_lock_register_check_streaming(&http_h264_lowres, rtsp_h264_needs_buffer);
+  buffer_lock_register_notify_buffer(&http_h264_lowres, rtsp_h264_low_res_capture);
+
   pthread_create(&rtsp_thread, NULL, rtsp_server_thread, env);
   return 0;
 
@@ -241,29 +274,6 @@ error:
   return -1;
 }
 
-extern "C" bool rtsp_h264_needs_buffer()
-{
-  return rtsp_streams != NULL;
-}
-
-extern "C" void rtsp_h264_capture(buffer_t *buf)
-{
-  pthread_mutex_lock(&rtsp_lock);
-  for (DynamicH264Stream *stream = rtsp_streams; stream; stream = stream->pNextStream) {
-    stream->receiveData(buf, false);
-  }
-  pthread_mutex_unlock(&rtsp_lock);
-}
-
-extern "C" void rtsp_h264_low_res_capture(struct buffer_s *buf)
-{
-  pthread_mutex_lock(&rtsp_lock);
-  for (DynamicH264Stream *stream = rtsp_streams; stream; stream = stream->pNextStream) {
-    stream->receiveData(buf, true);
-  }
-  pthread_mutex_unlock(&rtsp_lock);
-}
-
 #else // USE_RTSP
 
 extern "C" int rtsp_server()
@@ -271,17 +281,4 @@ extern "C" int rtsp_server()
   return 0;
 }
 
-extern "C" bool rtsp_h264_needs_buffer()
-{
-  return false;
-}
-
-extern "C" void rtsp_h264_capture(buffer_t *buf)
-{
-}
-
-extern "C" void rtsp_h264_low_res_capture(struct buffer_s *buf)
-{
-}
-
 #endif // USE_RTSP
\ No newline at end of file
diff --git a/output/rtsp/rtsp.h b/output/rtsp/rtsp.h
index 93d1fee..9d7bf57 100644
--- a/output/rtsp/rtsp.h
+++ b/output/rtsp/rtsp.h
@@ -5,6 +5,3 @@ typedef struct rtsp_options_s {
 } rtsp_options_t;
 
 int rtsp_server(rtsp_options_t *options);
-bool rtsp_h264_needs_buffer();
-void rtsp_h264_capture(struct buffer_s *buf);
-void rtsp_h264_low_res_capture(struct buffer_s *buf);