diff --git a/demo/Demo.cpp b/demo/Demo.cpp
index ecae7f1..f334354 100644
--- a/demo/Demo.cpp
+++ b/demo/Demo.cpp
@@ -1,8 +1,9 @@
 /***
 
   reset, pause, auto reset, analog d-pad, gamepad config, any key, confirm exit
-  game, screen wipes
+  game, screen wipes, screen offset, screen scale
   :) SWEATY HANDS :) OILY SNACKS :) AND BAD HYGIENE :)
+  *surf's up broccoli* <it's surfing time but it's treacherous>
 
 ***/
 
@@ -65,56 +66,6 @@ int link_shader(GLuint program)
     return 0;
 }
 
-SDL_Surface* get_screen_surface(SDL_Window *window)
-{
-    int w, h;
-    SDL_GetWindowSize(window, &w, &h);
-    unsigned char* pixels = new unsigned char[24 * w * h];
-    GLenum format;
-#if SDL_BYTEORDER == SDL_BIG_ENDIAN
-    format = GL_RGB;
-#else
-    format = GL_BGR;
-#endif
-    glReadPixels(0, 0, w, h, format, GL_UNSIGNED_BYTE, pixels);
-    SDL_Surface *surface = zoomSurface(
-        SDL_CreateRGBSurfaceFrom(pixels, w, h, 24, 3 * w,
-                                 0, 0, 0, 0), 1, -1, SMOOTHING_OFF);
-    delete[] pixels;
-    return surface;
-}
-
-void capture_screen(SDL_Window *window)
-{
-    SDL_Surface *surface = get_screen_surface(window);
-    IMG_SavePNG(surface, "screen.png");
-    printf("saved png to screen.png\n");
-    SDL_FreeSurface(surface);
-}
-
-void start_recording(bool *is_recording)
-{
-    *is_recording = true;
-    printf("start recording\n");
-}
-
-void end_recording(std::list<SDL_Surface*> frames, bool *is_recording)
-{
-    *is_recording = false;
-    printf("end recording\n");
-    SDL_Surface *frame;
-    int ii = 0;
-    while (not frames.empty())
-    {
-        frame = frames.front();
-        char path[22];
-        sprintf(path, "frames/%03i.png", ii++);
-        IMG_SavePNG(frame, path);
-        frames.pop_front();
-        SDL_FreeSurface(frame);
-    }
-}
-
 GLuint get_gl_texture_from_surface(SDL_Surface *surface, GLint mipmap_filter)
 {
     GLuint id;
@@ -162,12 +113,9 @@ struct Demo : Game
 {
 
     SDL_Texture *grass_texture;
-    int recording_capture_framerate = 100, frame_time_overflow = 0,
-        capture_time_overflow = 0, frame_count = 0, frame_count_timestamp,
-        last_capture_timestamp;
-    std::list<SDL_Surface*> frames;
-    bool is_recording = false, right_active = false, down_active = false,
-        left_active = false, up_active = false;
+    int frame_count = 0, frame_count_timestamp;
+    bool right_active = false, down_active = false, left_active = false,
+        up_active = false;
     SDL_Event event;
     GLuint vbo, space_texture_id, mvp_id, framerate_texture_id, flat_program,
         world_program, fake_texture_id;
@@ -341,7 +289,7 @@ struct Demo : Game
         glBindTexture(GL_TEXTURE_2D, space_texture_id);
         glUniform1i(sampler_uniform_id, 0);
         glDepthFunc(GL_LESS);
-        frame_count_timestamp = last_capture_timestamp = SDL_GetTicks();
+        frame_count_timestamp = SDL_GetTicks();
         framerate_texture_id = get_gl_texture_from_surface(
             get_framerate_indicator_surface(frame_count), GL_LINEAR);
     }
@@ -367,18 +315,7 @@ struct Demo : Game
         // {
         //     if (event.type == SDL_KEYDOWN)
         //     {
-        //         if (event.key.keysym.sym == SDLK_F10)
-        //         {
-        //             if (not is_recording)
-        //             {
-        //                 start_recording(&is_recording);
-        //             }
-        //             else
-        //             {
-        //                 end_recording(frames, &is_recording);
-        //             }
-        //         }
-        //         else if (event.key.keysym.sym == SDLK_F11)
+        //         if (event.key.keysym.sym == SDLK_F11)
         //         {
         //             if (SDL_GetWindowFlags(window) & SDL_WINDOW_FULLSCREEN)
         //             {
@@ -441,20 +378,6 @@ struct Demo : Game
         //         }
         //     }
         // }
-        if (is_recording and ticks - last_capture_timestamp + capture_time_overflow >
-            recording_capture_framerate)
-        {
-            frames.push_back(get_screen_surface(window));
-            printf("added frame at %i\n", ticks);
-            capture_time_overflow = ticks - last_capture_timestamp + capture_time_overflow -
-                recording_capture_framerate;
-            last_capture_timestamp = ticks;
-            for (int ii = 1; capture_time_overflow > recording_capture_framerate;
-                 ii++, capture_time_overflow -= recording_capture_framerate)
-            {
-                fprintf(stderr, "lost %i frame(s) during capture\n", ii);
-            }
-        }
         if (is_gl_context)
         {
             // glBindBuffer(GL_ARRAY_BUFFER, vbo[0]);
diff --git a/demo/Makefile b/demo/Makefile
index f2f8b05..770ec23 100644
--- a/demo/Makefile
+++ b/demo/Makefile
@@ -36,18 +36,21 @@ $(SDLGFX2_DIR)%.o: $(SDLGFX2_DIR)%.c $(SDLGFX2_DIR)%.h
 $(GLEW_DIR)%.o: $(GLEW_DIR)%.c $(GLEW_DIR)%.h
 	$(CC_LINUX) $(CFLAGS) $< -o $@
 
-$(SFW_SRC_DIR)Sprite.o: $(addprefix $(SFW_SRC_DIR),Game.*pp Location.*pp)
-$(SFW_SRC_DIR)Game.o: $(addprefix $(SFW_SRC_DIR),Sprite.*pp Configuration.*pp Delegate.*pp Display.*pp Recorder.*pp)
-$(SFW_SRC_DIR)Node.o: $(addprefix $(SFW_SRC_DIR),Game.*pp Configuration.*pp)
-$(SFW_SRC_DIR)Recorder.o: $(addprefix $(SFW_SRC_DIR),extension.*pp)
-$(SFW_SRC_DIR)%.o: $(addprefix $(SFW_SRC_DIR),%.cpp %.hpp Node.*pp)
+$(SFW_SRC_DIR)Sprite.o: $(addprefix $(SFW_SRC_DIR),Game.*pp Location.*pp Node.*pp)
+$(SFW_SRC_DIR)Game.o: $(addprefix $(SFW_SRC_DIR),Sprite.*pp Configuration.*pp Delegate.*pp Display.*pp \
+	Recorder.*pp Node.*pp)
+$(SFW_SRC_DIR)Node.o: $(addprefix $(SFW_SRC_DIR),Game.*pp Configuration.*pp Node.*pp)
+$(SFW_SRC_DIR)Animation.o: $(addprefix $(SFW_SRC_DIR),Timer.*pp)
+$(SFW_SRC_DIR)Recorder.o: $(addprefix $(SFW_SRC_DIR),extension.*pp Node.*pp)
+$(SFW_SRC_DIR)%.o: $(addprefix $(SFW_SRC_DIR),%.cpp %.hpp)
 	$(CPPC_LINUX) $(CPP_FLAGS) $(SDL_FLAGS) $< -o $@
 
-Demo.o: Demo.cpp Demo.hpp $(addprefix $(SFW_SRC_DIR),Sprite.*pp Node.*pp Game.*pp Location.*pp Input.*pp Recorder.*pp)
+Demo.o: Demo.cpp Demo.hpp $(addprefix $(SFW_SRC_DIR),Sprite.*pp Node.*pp Game.*pp Location.*pp Input.*pp \
+	Recorder.*pp Timer.*pp Animation.*pp extension.*pp)
 	$(CPPC_LINUX) $(CPP_FLAGS) $(SDL_FLAGS) $< -o $@
 
 linux: Demo.o $(addprefix $(SFW_SRC_DIR),Sprite.o Node.o Game.o Location.o Configuration.o Input.o Delegate.o \
-	Display.o Recorder.o extension.o) \
+	Display.o Recorder.o Timer.o Animation.o extension.o) \
 	$(GLEW_DIR)glew.o $(addprefix $(SDLGFX2_DIR),SDL2_rotozoom.o SDL2_gfxPrimitives.o)
 	$(CPPC_LINUX) $(LFLAGS) -D__LINUX__ $^ -lGL -lSDL2_image -lSDL2_ttf -lSDL2_mixer -lstdc++fs -o demo
 
diff --git a/demo/config.json b/demo/config.json
index a0cc862..88fff3f 100644
--- a/demo/config.json
+++ b/demo/config.json
@@ -5,7 +5,8 @@
     },
     "path":
     {
-        "screenshots": "local/screenshots"
+        "screenshots": "local/screenshots",
+        "video": "local/video"
     },
     "gamepad":
     {
diff --git a/src/Animation.cpp b/src/Animation.cpp
new file mode 100644
index 0000000..2701edf
--- /dev/null
+++ b/src/Animation.cpp
@@ -0,0 +1,70 @@
+#include "Animation.hpp"
+
+void Animation::play(int delay, bool play_once)
+{
+    this->delay = delay;
+    playing = true;
+    paused = false;
+    previous_step_time = timer.elapsed;
+    overflow = 0;
+    count = 0;
+    ending = play_once;
+    if (delay <= 0)
+    {
+        timer.toggle(true);
+    }
+}
+
+void Animation::play_once(int delay)
+{
+    play(delay, true);
+}
+
+void Animation::pause()
+{
+    timer.toggle(false);
+    paused = true;
+}
+
+void Animation::unpause()
+{
+    timer.toggle(true);
+    paused = false;
+}
+
+void Animation::reset()
+{
+    timer.toggle(false);
+    playing = false;
+    timer.reset();
+}
+
+void Animation::update()
+{
+    timer.update();
+    if (playing and not paused)
+    {
+        if (delay > 0)
+        {
+            delay -= timer.frame_duration;
+            if (delay <= 0)
+            {
+                timer.toggle(true);
+            }
+        }
+        if (delay <= 0)
+        {
+            if (timer.elapsed - previous_step_time + overflow > framerate)
+            {
+                overflow = timer.elapsed - previous_step_time + overflow - framerate;
+                previous_step_time = timer.elapsed;
+                step();
+                count++;
+                if (ending)
+                {
+                    reset();
+                }
+            }
+        }
+    }
+}
diff --git a/src/Animation.hpp b/src/Animation.hpp
new file mode 100644
index 0000000..5764b5d
--- /dev/null
+++ b/src/Animation.hpp
@@ -0,0 +1,36 @@
+#ifndef Animation_h_
+#define Animation_h_
+
+#include <vector>
+#include <functional>
+#include <algorithm>
+
+#include "Timer.hpp"
+
+typedef std::function<void()> callback;
+
+struct Animation
+{
+
+    bool playing = false, ending = false, paused = false;
+    int previous_step_time = 0, delay = 0, overflow = 0, count = 0, framerate;
+    callback step;
+    Timer timer = Timer();
+
+    template<typename T>
+    Animation(void(T::*f)(), T* o, int framerate = 0) : framerate(framerate)
+    {
+        step = std::bind(f, o);
+        timer.toggle(false);
+    }
+
+    void play(int = 0, bool = false);
+    void play_once(int = 0);
+    void pause();
+    void unpause();
+    void reset();
+    void update();
+
+};
+
+#endif
diff --git a/src/Configuration.cpp b/src/Configuration.cpp
index bd4f909..94f3bbe 100644
--- a/src/Configuration.cpp
+++ b/src/Configuration.cpp
@@ -15,20 +15,24 @@ void Configuration::set_defaults()
     sys_config["keys"] = {
         {"record", {"CTRL", "SHIFT", "f10"}},
         {"screenshot", "f9"},
-        {"action", " "},
+        {"action", "space"},
         {"up", "up"},
         {"right", "right"},
         {"down", "down"},
-        {"left", "left"}
+        {"left", "left"},
+        {"pause", "enter"},
+        {"fullscreen", {"ALT", "enter"}}
     };
     sys_config["path"] = {
-        {"screenshots", "."}
+        {"screenshots", "."},
+        {"video", "."}
     };
     sys_config["display"] = {
         {"dimensions", {640, 480}},
         {"screenshot-prefix", "screenshot-"},
         {"screenshot-extension", ".png"},
-        {"screenshot-zfill", 5}
+        {"screenshot-zfill", 5},
+        {"recording-framerate", 100}
     };
 }
 
diff --git a/src/Display.cpp b/src/Display.cpp
index 6296324..518a541 100644
--- a/src/Display.cpp
+++ b/src/Display.cpp
@@ -9,3 +9,27 @@ glm::ivec2 Display::get_window_size()
     SDL_GetWindowSize(get_root()->window, &size.x, &size.y);
     return size;
 }
+
+void Display::get_screen_pixels(unsigned char* pixels, int w, int h, int x, int y)
+{
+    GLenum format;
+#if SDL_BYTEORDER == SDL_BIG_ENDIAN
+    format = GL_RGB;
+#else
+    format = GL_BGR;
+#endif
+    glReadPixels(x, y, w, h, format, GL_UNSIGNED_BYTE, pixels);
+}
+
+SDL_Surface* Display::get_screen_surface()
+{
+    glm::ivec2 size = get_window_size();
+    unsigned char* pixels = new unsigned char[bpp / 8 * size.x * size.y];
+    get_screen_pixels(pixels, size.x, size.y);
+    SDL_Surface* surface = SDL_CreateRGBSurfaceFrom(
+        pixels, size.x, size.y, bpp, bpp / 8 * size.x, 0, 0, 0, 0);
+    SDL_Surface* zoomed_surface = zoomSurface(surface, 1, -1, SMOOTHING_OFF);
+    SDL_FreeSurface(surface);
+    delete[] pixels;
+    return zoomed_surface;
+}
diff --git a/src/Display.hpp b/src/Display.hpp
index 42b1012..a20478f 100644
--- a/src/Display.hpp
+++ b/src/Display.hpp
@@ -4,6 +4,14 @@
 #define GLM_ENABLE_EXPERIMENTAL
 #include "glm/vec2.hpp"
 
+#define GL_GLEXT_PROTOTYPES
+#define GLEW_STATIC
+#include "glew/glew.h"
+
+#include <SDL_image.h>
+#include "sdl2-gfx/SDL2_gfxPrimitives.h"
+#include "sdl2-gfx/SDL2_rotozoom.h"
+
 #include "SDL.h"
 
 #include "Node.hpp"
@@ -11,8 +19,12 @@
 struct Display : Node
 {
 
+    const static int bpp = 24;
+
     Display(Node*);
     glm::ivec2 get_window_size();
+    SDL_Surface* get_screen_surface();
+    void get_screen_pixels(unsigned char*, int, int, int = 0, int = 0);
 
 };
 
diff --git a/src/Game.cpp b/src/Game.cpp
index e576e9c..e33a8ce 100644
--- a/src/Game.cpp
+++ b/src/Game.cpp
@@ -130,6 +130,7 @@ void Game::run()
             last_frame_length = ticks - last_frame_timestamp;
             frame_time_overflow = last_frame_length + frame_time_overflow - frame_length;
             last_frame_timestamp = ticks;
+            recorder->update();
             delegate->dispatch();
             update();
         }
diff --git a/src/Input.hpp b/src/Input.hpp
index 7fa417a..f385e06 100644
--- a/src/Input.hpp
+++ b/src/Input.hpp
@@ -40,7 +40,9 @@ struct Input : Node
         {"f9", SDLK_F9},
         {"f10", SDLK_F10},
         {"f11", SDLK_F11},
-        {"f12", SDLK_F11}
+        {"f12", SDLK_F11},
+        {"enter", SDLK_RETURN},
+        {"space", SDLK_SPACE}
     };
     std::vector<KeyCombination> key_map;
 
diff --git a/src/Node.cpp b/src/Node.cpp
index e39c197..16fe87d 100644
--- a/src/Node.cpp
+++ b/src/Node.cpp
@@ -15,16 +15,6 @@ nlohmann::json& Node::get_configuration()
     return get_root()->configuration->config;
 }
 
-Delegate* Node::get_delegate()
-{
-    return get_root()->delegate;
-}
-
-Display* Node::get_display()
-{
-    return get_root()->display;
-}
-
 Game* Node::get_root()
 {
     Node *current = this;
@@ -35,6 +25,16 @@ Game* Node::get_root()
     return static_cast<Game*>(current);
 }
 
+Delegate* Node::get_delegate()
+{
+    return get_root()->delegate;
+}
+
+Display* Node::get_display()
+{
+    return get_root()->display;
+}
+
 void Node::print_branch()
 {
     Node *current = this;
diff --git a/src/Node.hpp b/src/Node.hpp
index 7b4fade..477d697 100644
--- a/src/Node.hpp
+++ b/src/Node.hpp
@@ -11,6 +11,7 @@
 struct Game;
 struct Delegate;
 struct Display;
+struct TimeFilter;
 
 struct Node
 {
diff --git a/src/Recorder.cpp b/src/Recorder.cpp
index fb6af7a..9df5125 100644
--- a/src/Recorder.cpp
+++ b/src/Recorder.cpp
@@ -11,65 +11,71 @@ void Recorder::respond(SDL_Event& event)
     {
         capture_screen();
     }
+    else if (get_delegate()->compare(event, "record"))
+    {
+        if (animation.playing)
+        {
+            end_recording();
+        }
+        else
+        {
+            start_recording();
+        }
+    }
 }
 
 void Recorder::capture_screen()
 {
     nlohmann::json config = get_configuration();
-    SDL_Surface* surface = get_screen_surface();
+    SDL_Surface* surface = get_display()->get_screen_surface();
     fs::path directory = config["path"]["screenshots"];
     fs::create_directories(directory);
     std::string prefix = config["display"]["screenshot-prefix"].
         get<std::string>();
     std::string extension = config["display"]["screenshot-extension"].
         get<std::string>();
-    std::stringstream file_pattern;
-    file_pattern << prefix << "(.*)" << extension;
-    fs::path query = directory / file_pattern.str();
-    std::vector<fs::path> files = sfw::glob(query);
     int zfill = config["display"]["screenshot-zfill"].get<int>();
-    int index = 1;
-    if (files.size())
-    {
-        const std::string last = files.back().string();
-        std::smatch matches;
-        std::regex_match(last, matches, std::regex(query.string()));
-        index = std::stoi(matches[1]) + 1;
-    }
-    std::stringstream filename;
-    fs::path path;
-    do
-    {
-        filename << prefix << sfw::pad(index++, zfill) << extension;
-        path = directory / filename.str();
-        filename.str("");
-        filename.clear();
-    }
-    while (fs::exists(path));
+    fs::path path = sfw::get_next_file_name(directory, zfill, prefix, extension);
     IMG_SavePNG(surface, path.c_str());
-    std::cout << "screenshot saved to " << path.string() << std::endl;
+    SDL_FreeSurface(surface);
+    std::cout << "Saved screenshot to " << path.string() << std::endl;
 }
 
-SDL_Surface* Recorder::get_screen_surface()
+void Recorder::start_recording()
 {
-    glm::ivec2 size = get_display()->get_window_size();
-    unsigned char* pixels = new unsigned char[24 * size.x * size.y];
-    get_screen_pixels(pixels, size.x, size.y);
-    SDL_Surface* surface = zoomSurface(
-        SDL_CreateRGBSurfaceFrom(
-            pixels, size.x, size.y, 24, 3 * size.x, 0, 0, 0, 0),
-        1, -1, SMOOTHING_OFF);
-    delete[] pixels;
-    return surface;
+    std::cout << "Starting recording..." << std::endl;
+    animation.play();
 }
 
-void Recorder::get_screen_pixels(unsigned char* pixels, int w, int h, int x, int y)
+void Recorder::add_frame_to_video()
 {
-    GLenum format;
-#if SDL_BYTEORDER == SDL_BIG_ENDIAN
-    format = GL_RGB;
-#else
-    format = GL_BGR;
-#endif
-    glReadPixels(x, y, w, h, format, GL_UNSIGNED_BYTE, pixels);
+    frames.push_back(get_display()->get_screen_surface());
+}
+
+void Recorder::end_recording()
+{
+    std::cout << "Ending recording..." << std::endl;
+    animation.reset();
+    SDL_Surface* frame;
+    nlohmann::json config = get_configuration();
+    fs::path root = config["path"]["video"];
+    fs::create_directories(root);
+    fs::path directory = sfw::get_next_file_name(root, 5, "video-");
+    fs::create_directories(directory);
+    std::cout << "Writing recording to " << directory << "..." << std::endl;
+    for (int ii = 0; not frames.empty(); ii++)
+    {
+        frame = frames.front();
+        std::stringstream name;
+        name << sfw::pad(ii, 5) << ".png";
+        fs::path path = directory / name.str();
+        IMG_SavePNG(frame, path.string().c_str());
+        frames.erase(frames.begin());
+        SDL_FreeSurface(frame);
+    }
+}
+
+void Recorder::update()
+{
+    animation.update();
 }
diff --git a/src/Recorder.hpp b/src/Recorder.hpp
index 6a27616..8031ff4 100644
--- a/src/Recorder.hpp
+++ b/src/Recorder.hpp
@@ -9,18 +9,10 @@
 #define GLM_ENABLE_EXPERIMENTAL
 #include "glm/ext.hpp"
 
-#define GL_GLEXT_PROTOTYPES
-#define GLEW_STATIC
-#include "glew/glew.h"
-
-#include <SDL_image.h>
-#include "sdl2-gfx/SDL2_gfxPrimitives.h"
-#include "sdl2-gfx/SDL2_rotozoom.h"
-
 #include "json/json.hpp"
 
 #include "filesystem.hpp"
-#include "Node.hpp"
+#include "Animation.hpp"
 #include "Delegate.hpp"
 #include "Display.hpp"
 #include "extension.hpp"
@@ -28,11 +20,17 @@
 struct Recorder : Node
 {
 
+    std::vector<SDL_Surface*> frames;
+    Animation animation = Animation(&Recorder::add_frame_to_video, this, 100);
+
     Recorder(Node*);
     void respond(SDL_Event&);
     void capture_screen();
-    SDL_Surface* get_screen_surface();
-    void get_screen_pixels(unsigned char*, int, int, int = 0, int = 0);
+    void start_recording();
+    void add_frame_to_video();
+    void end_recording();
+    void update();
+    std::string get_class_name() { return "Recorder"; }
 
 };
 
diff --git a/src/Timer.cpp b/src/Timer.cpp
new file mode 100644
index 0000000..9511a97
--- /dev/null
+++ b/src/Timer.cpp
@@ -0,0 +1,33 @@
+#include "Timer.hpp"
+
+Timer::Timer()
+{
+    ticks = SDL_GetTicks();
+    ticks_previous = ticks;
+}
+
+void Timer::toggle()
+{
+    is_timing = not is_timing;
+}
+
+void Timer::toggle(bool state)
+{
+    is_timing = state;
+}
+
+void Timer::reset()
+{
+    elapsed = 0;
+}
+
+void Timer::update()
+{
+    ticks = SDL_GetTicks();
+    frame_duration = ticks - ticks_previous;
+    if (is_timing)
+    {
+        elapsed += frame_duration;
+    }
+    ticks_previous = ticks;
+}
diff --git a/src/Timer.hpp b/src/Timer.hpp
new file mode 100644
index 0000000..6f741f1
--- /dev/null
+++ b/src/Timer.hpp
@@ -0,0 +1,21 @@
+#ifndef Timer_h_
+#define Timer_h_
+
+#include "SDL.h"
+
+struct Timer
+{
+
+    int ticks, ticks_previous, frame_duration = 0, elapsed = 0;
+    bool is_timing = true;
+
+    Timer();
+
+    void toggle();
+    void toggle(bool);
+    void reset();
+    void update();
+
+};
+
+#endif
diff --git a/src/extension.cpp b/src/extension.cpp
index 8a27f7f..9a58d79 100644
--- a/src/extension.cpp
+++ b/src/extension.cpp
@@ -9,7 +9,6 @@ std::vector<fs::path> sfw::glob(fs::path query)
     }
     std::regex expression(query.string());
     std::vector<fs::path> files;
-    std::cout << basename << " " << query << std::endl;
     for (auto& entry: fs::directory_iterator(basename))
     {
         if (std::regex_match(entry.path().string(), expression))
@@ -20,3 +19,31 @@ std::vector<fs::path> sfw::glob(fs::path query)
     std::sort(files.begin(), files.end());
     return files;
 }
+
+fs::path sfw::get_next_file_name(
+    fs::path directory, int zfill, std::string prefix, std::string extension)
+{
+    std::stringstream file_pattern;
+    file_pattern << prefix << "([0-9]+)" << extension;
+    fs::path query = directory / file_pattern.str();
+    std::vector<fs::path> files = sfw::glob(query);
+    int index = 1;
+    if (files.size())
+    {
+        const std::string last = files.back().string();
+        std::smatch matches;
+        std::regex_match(last, matches, std::regex(query.string()));
+        index = std::stoi(matches[1]) + 1;
+    }
+    std::stringstream filename;
+    fs::path path;
+    do
+    {
+        filename << prefix << sfw::pad(index++, zfill) << extension;
+        path = directory / filename.str();
+        filename.str("");
+        filename.clear();
+    }
+    while (fs::exists(path));
+    return path;
+}
diff --git a/src/extension.hpp b/src/extension.hpp
index 781e29a..88c55b1 100644
--- a/src/extension.hpp
+++ b/src/extension.hpp
@@ -13,6 +13,8 @@
 namespace sfw
 {
     std::vector<fs::path> glob(fs::path);
+    fs::path get_next_file_name(
+        fs::path, int = 0, std::string = "", std::string = "");
 
     template<typename T>
     std::string pad(T end, int width, char fill = '0')