diff --git a/Makefile.am b/Makefile.am
index b1a12cd..b806e9f 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,6 +1,6 @@
 AUTOMAKE_OPTIONS = foreign subdir-objects -Wall
 bin_PROGRAMS = forge
-forge_SOURCES = src/main.c src/args.c src/forge.c src/file.c src/window.c src/shaders.c src/timer.c src/string.c src/config_file.c src/rand.c src/video.c $(top_srcdir)/include/glad/gl.h $(top_srcdir)/include/glad/egl.h $(top_srcdir)/hashmap.c/hashmap.c $(top_srcdir)/log.c/src/log.c
+forge_SOURCES = src/main.c src/args.c src/forge.c src/file.c src/window.c src/shaders.c src/timer.c src/string.c src/config_file.c src/rand.c src/video.c src/shared.c $(top_srcdir)/include/glad/gl.h $(top_srcdir)/include/glad/egl.h $(top_srcdir)/hashmap.c/hashmap.c $(top_srcdir)/log.c/src/log.c
 forge_CFLAGS = -Ofast -march=native -flto -funroll-loops -fprefetch-loop-arrays -fno-exceptions -fopenmp -I$(top_srcdir)/include -DGLFW_INCLUDE_NONE -DGLFW_EXPOSE_NATIVE_EGL -DGLFW_NATIVE_INCLUDE_NONE -DLOG_USE_COLOR
 forge_LDADD = -lm -lGL -lglfw
-include_HEADERS = src/main.h src/args.h src/config.h src/types.h src/forge.h src/file.h src/constants.h src/window.h src/shaders.h src/timer.h src/string.h src/config_file.h src/rand.h src/video.h $(top_srcdir)/include/glad/gl.h $(top_srcdir)/include/glad/egl.h $(top_srcdir)/include/linmath.h $(top_srcdir)/include/hashmap.h $(top_srcdir)/include/log.h
\ No newline at end of file
+include_HEADERS = src/main.h src/args.h src/config.h src/types.h src/forge.h src/file.h src/constants.h src/window.h src/shaders.h src/timer.h src/string.h src/config_file.h src/rand.h src/video.h src/shared.h $(top_srcdir)/include/glad/gl.h $(top_srcdir)/include/glad/egl.h $(top_srcdir)/include/linmath.h $(top_srcdir)/include/hashmap.h $(top_srcdir)/include/log.h
\ No newline at end of file
diff --git a/Makefile.dev b/Makefile.dev
index 67aa4ef..7093aad 100644
--- a/Makefile.dev
+++ b/Makefile.dev
@@ -25,7 +25,7 @@ build:
 
 .PHONY: run
 run: build
-	./build/$(TARGET) $(TEST_ARGS) --monitor-only --internal-size=240 --hot-reload
+	./build/$(TARGET) $(TEST_ARGS) --monitor-only --internal-size=480 --video-size=240 --hot-reload
 
 .PHONY: demo
 demo: build
diff --git a/README.md b/README.md
index 208c4f0..35531c0 100644
--- a/README.md
+++ b/README.md
@@ -139,7 +139,8 @@ make -f Makefile.dev release-arch
   - [x] Shader based format mapping
   - [x] Video mapping config file
   - [x] Get first video size matching internal size
-  - [x] other internal size for video
+  - [x] Other internal size for video
+  - [x] Pass input fps into shaders for debug
   - [ ] Clean code and fix things
 - [x] Monitor screen
   - [x] 2nd window
diff --git a/config/shaders.cfg b/config/shaders.cfg
index 61a9e77..15289e9 100644
--- a/config/shaders.cfg
+++ b/config/shaders.cfg
@@ -5,6 +5,8 @@ UNIFORM_DEMO=iDemo
 UNIFORM_RESOLUTION=iResolution
 UNIFORM_TEX_RESOLUTION=iTexResolution
 UNIFORM_IN_RESOLUTION_PREFIX=iInputResolution
+UNIFORM_IN_FORMAT_PREFIX=iInputFormat
+UNIFORM_IN_FPS_PREFIX=iInputFPS
 UNIFORM_SEED_PREFIX=seed
 UNIFORM_STATE_PREFIX=state
 UNIFORM_TEX_PREFIX=tex
diff --git a/shaders/frag0.glsl b/shaders/frag0.glsl
index 0217d9b..7202895 100644
--- a/shaders/frag0.glsl
+++ b/shaders/frag0.glsl
@@ -11,6 +11,10 @@ uniform float iTempo;
 uniform int iFPS;
 uniform vec2 iResolution;
 uniform vec2 iTexResolution;
+uniform vec2 iInputResolution1;
+uniform vec2 iInputResolution2;
+uniform int iInputFPS1;
+uniform int iInputFPS2;
 uniform int iDemo;
 
 uniform int seed1;
@@ -1310,12 +1314,26 @@ subroutine(src_stage_sub) vec4 src_16(vec2 vUV, int seed)
     f += selected_fx == 4 ? h_rect(uv2, vec2(-2, -3.2), vec2(1, 0), 0.1) : 0;
 
     // show inputs / feedback
-    f += selected_srca == 5 ? rect(uv2, vec2(-8, 2), vec2(2, 0.1)) : 0;
-    f += selected_srca == 10 ? rect(uv2, vec2(-7, 2), vec2(1, 0.1)) + rect(uv2, vec2(-8, 0.5), vec2(0.1, 1.6)) + rect(uv2, vec2(-9, -1), vec2(1, 0.1)) : 0;
-    f += (selected_srca == 0 || selected_srca % 5 != 0 && selected_srca >= 8) ? rect(uv2, vec2(-6.5, 2), vec2(0.5, 0.1)) + rect(uv2, vec2(0, 4), vec2(7, 0.1)) + rect(uv2, vec2(-7, 3), vec2(0.1, 1.1)) + rect(uv2, vec2(7, 2), vec2(0.1, 2.1)) : 0;
-    f += selected_srcb == 5 ? rect(uv2, vec2(-6.5, -2), vec2(0.5, 0.1)) + rect(uv2, vec2(-7, -0.5), vec2(0.1, 1.6)) + rect(uv2, vec2(-8.5, 1), vec2(1.5, 0.1)) : 0;
-    f += selected_srcb == 10 ? rect(uv2, vec2(-8, -2), vec2(2, 0.1)) : 0;
-    f += (selected_srcb == 0 || selected_srcb % 5 != 0 && selected_srcb >= 8) ? rect(uv2, vec2(-6.5, -2), vec2(0.5, 0.1)) + rect(uv2, vec2(0, -4), vec2(7, 0.1)) + rect(uv2, vec2(-7, -3), vec2(0.1, 1.1)) + rect(uv2, vec2(7, -2), vec2(0.1, 2.1)) : 0;
+    float line_a_a = rect(uv2, vec2(-8, 2), vec2(2, 0.1));
+    float line_a_b = rect(uv2, vec2(-7, 2), vec2(1, 0.1)) + rect(uv2, vec2(-8, 0.5), vec2(0.1, 1.6)) + rect(uv2, vec2(-9, -1), vec2(1, 0.1));
+    float line_a_f = rect(uv2, vec2(-6.5, 2), vec2(0.5, 0.1)) + rect(uv2, vec2(0, 4), vec2(7, 0.1)) + rect(uv2, vec2(-7, 3), vec2(0.1, 1.1)) + rect(uv2, vec2(7, 2), vec2(0.1, 2.1));
+    if (selected_srca == 5) {
+        f += iInputResolution1.x > 0 ? line_a_a : line_a_f;
+    } else if (selected_srca == 10) {
+        f += iInputResolution2.x > 0 ? line_a_b : line_a_f;
+    } else if (selected_srca == 0 || selected_srca >= 8) {
+        f += line_a_f;
+    }
+    float line_b_a = rect(uv2, vec2(-6.5, -2), vec2(0.5, 0.1)) + rect(uv2, vec2(-7, -0.5), vec2(0.1, 1.6)) + rect(uv2, vec2(-8.5, 1), vec2(1.5, 0.1));
+    float line_b_b = rect(uv2, vec2(-8, -2), vec2(2, 0.1));
+    float line_b_f = rect(uv2, vec2(-6.5, -2), vec2(0.5, 0.1)) + rect(uv2, vec2(0, -4), vec2(7, 0.1)) + rect(uv2, vec2(-7, -3), vec2(0.1, 1.1)) + rect(uv2, vec2(7, -2), vec2(0.1, 2.1));
+    if (selected_srcb == 5) {
+        f += iInputResolution1.x > 0 ? line_b_a : line_b_f;
+    } else if (selected_srcb == 10) {
+        f += iInputResolution2.x > 0 ? line_b_b : line_b_f;
+    } else if (selected_srcb == 0 || selected_srcb >= 8) {
+        f += line_b_f;
+    }
 
     // show page
     f += char_at(uv2, vec2(-9.2, -4.3), hex_chars[page]);
@@ -1338,24 +1356,34 @@ subroutine(src_stage_sub) vec4 src_16(vec2 vUV, int seed)
     f += write_int(uv3, vec2(x - 4,13), iFPS, 3);
     v = min(1, iFPS/60.0);
     f += h_rect(uv3, vec2(x, 12), vec2(4, 0.5), 0.2);
-    f += rect(uv3, vec2(x + 4 * v - 4, 12), vec2(4 * v, 0.4));
+    f += rect(uv3, vec2(x + 4 * v - 3.5, 12), vec2(4 * v, 0.4));
     
     x = 0;
     f += write_5(uv3, vec2(x,13), texts[1]);
     f += write_int(uv3, vec2(x - 4,13), int(iTempo), 3);
     v = modTime(1);
     f += h_rect(uv3, vec2(x, 12), vec2(4, 0.5), 0.2);
-    f += rect(uv3, vec2(x + 4 * v - 4, 12), vec2(4 * v, 0.4));
+    f += rect(uv3, vec2(x + 4 * v - 3.5, 12), vec2(4 * v, 0.4));
 
     x = 15;
     f += write_5(uv3, vec2(x,13), texts[2]);
     f += write_int(uv3, vec2(x - 6,13), int(iTime), 5);
     v = fract(iTime);
     f += h_rect(uv3, vec2(x, 12), vec2(4, 0.5), 0.2);
-    f += rect(uv3, vec2(x + 4 * v - 4, 12), vec2(4 * v, 0.4));
+    f += rect(uv3, vec2(x + 4 * v - 3.5, 12), vec2(4 * v, 0.4));
 
     f += write_5(uv3, vec2(-2,-15), iDemo > 0 ? texts[3] : texts[4]);
 
+    if (iInputResolution1.x > 0) {
+        f += write_5(uv3, vec2(-23.5,5.5), texts[0]);
+        f += write_int(uv3, vec2(-27,5.5), iInputFPS1, 3);
+    }
+
+    if (iInputResolution2.x > 0) {
+        f += write_5(uv3, vec2(-23.5,-9.5), texts[0]);
+        f += write_int(uv3, vec2(-27,-9.5), iInputFPS2, 3);
+    }
+
     return vec4(f);
 }
 
@@ -1924,7 +1952,7 @@ subroutine(mix_stage_sub) vec4 mix_16(vec2 vUV, sampler2D ta, sampler2D tb, int
 
 const mat3x3 yuv_to_rgb = {{1,1,1},{0,-0.39465,2.03211},{1.13983,-0.5806,0}};
 
-const float YUYV_FOURCC = 1448695129.0;
+const int YUYV_FOURCC = 1448695129;
 
 vec4 yuyvTex(sampler2D tex, vec2 vUV, int base_width) {
     float w = base_width - 1;
diff --git a/shaders/frag1.glsl b/shaders/frag1.glsl
index 8be51ea..9f62239 100644
--- a/shaders/frag1.glsl
+++ b/shaders/frag1.glsl
@@ -6,12 +6,12 @@
 in vec2 vUV;
 out vec4 fragColor;
 
-uniform vec3 iInputResolution1;
+uniform int iInputFormat1;
 
 void main() {
-    if (iInputResolution1.z == YUYV_FOURCC) {
+    if (iInputFormat1 == YUYV_FOURCC) {
         fragColor = yuyvTex(tex1, vUV, int(iInputResolution1.x));
     } else {
-        fragColor = vec4(0, 0, 0, 1);
+        fragColor = texture(tex0, vUV);
     }
 }
\ No newline at end of file
diff --git a/shaders/frag2.glsl b/shaders/frag2.glsl
index 7fb44ff..db7701e 100644
--- a/shaders/frag2.glsl
+++ b/shaders/frag2.glsl
@@ -6,12 +6,12 @@
 in vec2 vUV;
 out vec4 fragColor;
 
-uniform vec3 iInputResolution2;
+uniform int iInputFormat2;
 
 void main() {
-    if (iInputResolution2.z == YUYV_FOURCC) {
+    if (iInputFormat2 == YUYV_FOURCC) {
         fragColor = yuyvTex(tex2, vUV, int(iInputResolution2.x));
     } else {
-        fragColor = vec4(0, 0, 0, 1);
+        fragColor = texture(tex0, vUV);
     }
 }
\ No newline at end of file
diff --git a/src/forge.c b/src/forge.c
index 8267ec2..61d4a6d 100644
--- a/src/forge.c
+++ b/src/forge.c
@@ -10,6 +10,7 @@
 #include "forge.h"
 #include "rand.h"
 #include "shaders.h"
+#include "shared.h"
 #include "timer.h"
 #include "types.h"
 #include "video.h"
@@ -24,15 +25,19 @@ static File *fragment_shaders;
 static File common_shader_code;
 static Timer timer;
 static ConfigFile shader_config;
-static bool stop;
+static SharedBool *stop;
+
+static void compute_fps() {
+  unsigned int i;
 
-static unsigned int compute_fps() {
   double fps;
   char title[100];
 
   if (timer_inc(&timer)) {
     fps = timer_reset(&timer);
 
+    log_trace("(main) %.2ffps", fps);
+
     if (window_output != NULL) {
       sprintf(title, PACKAGE " " VERSION " - %.0ffps", fps);
       window_update_title(window_output, title);
@@ -42,9 +47,15 @@ static unsigned int compute_fps() {
       sprintf(title, PACKAGE " " VERSION " (monitor) - %.0ffps", fps);
       window_update_title(window_monitor, title);
     }
+
+    context.fps = (unsigned int)round(fps);
   }
 
-  return (unsigned int)round(fps);
+  for (i = 0; i < program.in_count; i++) {
+    if (!inputs[i].error) {
+      context.input_fps[i] = inputs[i].fps->value;
+    }
+  }
 }
 
 static void randomize_context_state() {
@@ -79,6 +90,8 @@ static void init_context(Parameters params) {
       (unsigned int *)calloc(program.in_count, sizeof(unsigned int));
   context.input_formats =
       (unsigned int *)calloc(program.in_count, sizeof(unsigned int));
+  context.input_fps =
+      (unsigned int *)calloc(program.in_count, sizeof(unsigned int));
 
   for (i = 0; i < program.in_count; i++) {
     if (!inputs[i].error) {
@@ -95,6 +108,7 @@ static void free_context() {
   free(context.input_widths);
   free(context.input_heights);
   free(context.input_formats);
+  free(context.input_fps);
 }
 
 static void hot_reload() {
@@ -175,7 +189,7 @@ static void start_video_captures(unsigned int video_count) {
 
   for (i = 0; i < video_count; i++) {
     if (!inputs[i].error) {
-      video_background_read(&inputs[i], &stop);
+      video_background_read(&inputs[i], stop);
     }
   }
 }
@@ -195,7 +209,7 @@ static void free_video_captures(unsigned int video_count) {
 static void error_callback(int error, const char *description) {
   log_error("[GLFW] %d: %s", error, description);
   window_terminate();
-  stop = true;
+  stop->value = true;
   exit(EXIT_FAILURE);
 }
 
@@ -219,7 +233,7 @@ static void loop(bool hr) {
     hot_reload();
   }
 
-  context.fps = compute_fps();
+  compute_fps();
 
   context.time = window_get_time();
 
@@ -245,7 +259,7 @@ static void loop(bool hr) {
 void forge_run(Parameters params) {
   unsigned int frag_count;
 
-  stop = false;
+  stop = shared_init_bool("/" PACKAGE "_stop", false);
 
   shader_config = config_file_read(params.frag_config_path, false);
 
@@ -253,12 +267,12 @@ void forge_run(Parameters params) {
 
   init_files(params.frag_path, frag_count);
 
+  init_inputs(params.video_in, params.video_in_count, params.video_size);
+
   window_startup(error_callback);
 
   context.internal_height = params.internal_size;
 
-  init_inputs(params.video_in, params.video_in_count, params.video_size);
-
   if (params.output) {
     window_output = window_init(PACKAGE " " VERSION, params.output_screen,
                                 params.windowed, NULL, key_callback);
@@ -303,7 +317,7 @@ void forge_run(Parameters params) {
     loop(params.hot_reload);
   }
 
-  stop = true;
+  stop->value = true;
 
   wait(NULL);
 
diff --git a/src/shaders.c b/src/shaders.c
index f01e253..cd2d7a4 100644
--- a/src/shaders.c
+++ b/src/shaders.c
@@ -272,13 +272,28 @@ static void init_single_program(ShaderProgram *program, unsigned int i,
 
   prefix = config_file_get_str(shader_config, "UNIFORM_IN_RESOLUTION_PREFIX",
                                "iInputResolution");
-
   for (j = 0; j < program->in_count; j++) {
     sprintf(name, "%s%d", prefix, j + 1);
     program->iinres_locations[i * program->in_count + j] =
         glGetUniformLocation(program->programs[i], name);
   }
 
+  prefix = config_file_get_str(shader_config, "UNIFORM_IN_FORMAT_PREFIX",
+                               "iInputFormat");
+  for (j = 0; j < program->in_count; j++) {
+    sprintf(name, "%s%d", prefix, j + 1);
+    program->iinfmt_locations[i * program->in_count + j] =
+        glGetUniformLocation(program->programs[i], name);
+  }
+
+  prefix =
+      config_file_get_str(shader_config, "UNIFORM_IN_FPS_PREFIX", "iInputFPS");
+  for (j = 0; j < program->in_count; j++) {
+    sprintf(name, "%s%d", prefix, j + 1);
+    program->iinfps_locations[i * program->in_count + j] =
+        glGetUniformLocation(program->programs[i], name);
+  }
+
   prefix = config_file_get_str(shader_config, "UNIFORM_SEED_PREFIX", "seed");
   for (j = 0; j < program->frag_count; j++) {
     sprintf(name, "%s%d", prefix, j + 1);
@@ -335,6 +350,10 @@ static void init_programs(ShaderProgram *program, ConfigFile shader_config) {
   program->itexres_locations = malloc(program->frag_count * sizeof(GLuint));
   program->iinres_locations =
       malloc(program->frag_count * program->in_count * sizeof(GLuint));
+  program->iinfmt_locations =
+      malloc(program->frag_count * program->in_count * sizeof(GLuint));
+  program->iinfps_locations =
+      malloc(program->frag_count * program->in_count * sizeof(GLuint));
   program->idemo_locations = malloc(program->frag_count * sizeof(GLuint));
   program->iseed_locations =
       malloc(program->frag_count * program->frag_count * sizeof(GLuint));
@@ -435,8 +454,7 @@ static void use_program(ShaderProgram program, int i, bool output,
                         Context context) {
   unsigned int j, k;
   GLuint *subroutines;
-  vec2 resolution, tex_resolution;
-  vec3 in_resolution;
+  vec2 resolution, tex_resolution, in_resolution;
 
   resolution[0] = (float)context.width;
   resolution[1] = (float)context.height;
@@ -474,10 +492,13 @@ static void use_program(ShaderProgram program, int i, bool output,
   for (j = 0; j < program.in_count; j++) {
     in_resolution[0] = context.input_widths[j];
     in_resolution[1] = context.input_heights[j];
-    in_resolution[2] = context.input_formats[j];
 
-    glUniform3fv(program.iinres_locations[i * program.in_count + j], 1,
+    glUniform2fv(program.iinres_locations[i * program.in_count + j], 1,
                  (const GLfloat *)&in_resolution);
+    glUniform1i(program.iinfmt_locations[i * program.in_count + j],
+                (const GLint)context.input_formats[j]);
+    glUniform1i(program.iinfps_locations[i * program.in_count + j],
+                (const GLint)context.input_fps[j]);
   }
 
   // set seeds uniforms
diff --git a/src/shared.c b/src/shared.c
new file mode 100644
index 0000000..c63519d
--- /dev/null
+++ b/src/shared.c
@@ -0,0 +1,51 @@
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include "shared.h"
+#include "types.h"
+
+static void *open_shared(const char *key, size_t size, int *fd) {
+  *fd = shm_open(key, O_CREAT | O_RDWR, S_IRUSR | S_IWUSR);
+  ftruncate(*fd, size);
+
+  return mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, *fd, 0);
+}
+
+static void close_shared(void *shared, size_t size, int fd) {
+  munmap(shared, size);
+  close(fd);
+}
+
+SharedUint *shared_init_uint(const char *key, unsigned int initial_value) {
+  int shared_fd;
+  SharedUint *shared;
+
+  shared = open_shared(key, sizeof(SharedUint), &shared_fd);
+
+  shared->fd = shared_fd;
+  shared->value = initial_value;
+
+  return shared;
+}
+
+void shared_close_uint(SharedUint *shared) {
+  close_shared(shared, sizeof(SharedUint), shared->fd);
+}
+
+SharedBool *shared_init_bool(const char *key, bool initial_value) {
+  int shared_fd;
+  SharedBool *shared;
+
+  shared = open_shared(key, sizeof(SharedBool), &shared_fd);
+
+  shared->fd = shared_fd;
+  shared->value = initial_value;
+
+  return shared;
+}
+
+void shared_close_bool(SharedBool *shared) {
+  close_shared(shared, sizeof(SharedBool), shared->fd);
+}
diff --git a/src/shared.h b/src/shared.h
new file mode 100644
index 0000000..7db1945
--- /dev/null
+++ b/src/shared.h
@@ -0,0 +1,12 @@
+#include "types.h"
+
+#ifndef SHARED_H
+#define SHARED_H
+
+SharedUint *shared_init_uint(const char *key, unsigned int initial_value);
+void shared_close_uint(SharedUint *shared);
+
+SharedBool *shared_init_bool(const char *key, bool initial_value);
+void shared_close_bool(SharedBool *shared);
+
+#endif /* SHARED_H */
\ No newline at end of file
diff --git a/src/types.h b/src/types.h
index ae60597..5e0516b 100644
--- a/src/types.h
+++ b/src/types.h
@@ -13,6 +13,16 @@
 #ifndef TYPES_H
 #define TYPES_H
 
+typedef struct SharedUint {
+  int fd;
+  unsigned int value;
+} SharedUint;
+
+typedef struct SharedBool {
+  int fd;
+  bool value;
+} SharedBool;
+
 typedef struct Parameters {
   bool hot_reload;
   bool output;
@@ -70,6 +80,8 @@ typedef struct ShaderProgram {
   GLuint *ires_locations;
   GLuint *itexres_locations;
   GLuint *iinres_locations;
+  GLuint *iinfmt_locations;
+  GLuint *iinfps_locations;
   GLuint *idemo_locations;
   GLuint *iseed_locations;
   GLuint *istate_locations;
@@ -95,6 +107,7 @@ typedef struct VideoCapture {
   unsigned int height;
   unsigned int pixelformat;
   unsigned int bytesperline;
+  SharedUint *fps;
   bool output;
   struct v4l2_buffer buf;
   EGLImageKHR dma_image;
@@ -117,6 +130,7 @@ typedef struct Context {
   unsigned int *input_widths;
   unsigned int *input_heights;
   unsigned int *input_formats;
+  unsigned int *input_fps;
 } Context;
 
 typedef struct Timer {
diff --git a/src/video.c b/src/video.c
index 9ff07d5..42845f1 100644
--- a/src/video.c
+++ b/src/video.c
@@ -3,10 +3,14 @@
 #include <linux/videodev2.h>
 #include <log.h>
 #include <stdbool.h>
+#include <stdio.h>
 #include <stdlib.h>
 #include <sys/ioctl.h>
 #include <unistd.h>
 
+#include "config.h"
+#include "rand.h"
+#include "shared.h"
 #include "timer.h"
 #include "types.h"
 #include "video.h"
@@ -266,6 +270,14 @@ static void create_image_buffer(VideoCapture *video_capture) {
   ioctl(video_capture->fd, VIDIOC_QBUF, &video_capture->buf);
 }
 
+static void create_shared_data(VideoCapture *video_capture) {
+  char name[256];
+
+  sprintf(name, "/" PACKAGE "_fps_%d", rand_uint(1000000));
+
+  video_capture->fps = shared_init_uint(name, 0);
+}
+
 static void close_stream(VideoCapture video_capture) {
   ioctl(video_capture.fd, VIDIOC_STREAMOFF, &buf_type);
 }
@@ -305,6 +317,8 @@ VideoCapture video_init(char *name, unsigned int preferred_height) {
 
   create_image_buffer(&video_capture);
 
+  create_shared_data(&video_capture);
+
   return video_capture;
 }
 
@@ -326,9 +340,11 @@ static bool read_video(VideoCapture *video_capture) {
   return true;
 }
 
-void video_background_read(VideoCapture *video_capture, bool *stop) {
+void video_background_read(VideoCapture *video_capture, SharedBool *stop) {
   pid_t pid;
   Timer timer;
+  double fps;
+
   pid = fork();
   if (pid < 0) {
     log_error("Could not create subprocess");
@@ -341,21 +357,30 @@ void video_background_read(VideoCapture *video_capture, bool *stop) {
            pid);
   timer = timer_init(30);
 
-  while (!*stop && read_video(video_capture)) {
+  while (!stop->value && read_video(video_capture)) {
     // repeat infinitely
     if (timer_inc(&timer)) {
-      log_trace("(%s) %.2ffps", video_capture->name, timer_reset(&timer));
+      fps = timer_reset(&timer);
+
+      video_capture->fps->value = (unsigned int)round(fps);
+      log_trace("(%s) %.2ffps", video_capture->name, fps);
     }
   }
-  log_info("%s background acquisition stopped (pid: %d)", video_capture->name,
-           pid);
+  if (stop->value) {
+    log_info("%s background acquisition stopped by main thread (pid: %d)",
+             video_capture->name, pid);
+  } else {
+    log_info("%s background acquisition stopped after error (pid: %d)",
+             video_capture->name, pid);
+  }
   window_terminate();
-  exit(EXIT_SUCCESS);
+  exit(stop->value ? EXIT_SUCCESS : EXIT_FAILURE);
 }
 
 void video_free(VideoCapture video_capture) {
   if (!video_capture.error) {
     close_stream(video_capture);
+    shared_close_uint(video_capture.fps);
   }
   if (video_capture.exp_fd != -1) {
     close(video_capture.exp_fd);
diff --git a/src/video.h b/src/video.h
index a9acde7..67296a5 100644
--- a/src/video.h
+++ b/src/video.h
@@ -5,7 +5,7 @@
 
 VideoCapture video_init(char *name, unsigned int preferred_height);
 
-void video_background_read(VideoCapture *video_capture, bool *stop);
+void video_background_read(VideoCapture *video_capture, SharedBool *stop);
 
 void video_free(VideoCapture video_capture);