diff --git a/.gitignore b/.gitignore
index fb11540..e0ae145 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,4 +6,7 @@ build/
 .DS_Store
 
 
-.vscode
\ No newline at end of file
+.vscode
+
+audio
+challenges
\ No newline at end of file
diff --git a/src/main.cpp b/src/main.cpp
index 05ddb03..f1d2846 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,31 +1,57 @@
 #include "stx-execpipe.h"
-#include <iostream>
 
+#include <iostream>
 #include <vector>
 #include <string>
+#include <random>
 
 static const std::vector<std::string> links = {
-    "2gQ--SCEfmI"};
+    "2gQ--SCEfmI",
+    "9xBeLSXOvSY",
+    "gv7QwZqMFYc",
+    "tFRStkEkhbY",
+    "OecoHvuxkxY",
+    "7SVKgjhpTHY",
+    "KF63Z27NPTE",
+    "7fKPxTbFt88",
+    "ZccDikDUHmA",
+    "PjnHPuEUbjU"
+};
 
-static const std::string YTDLP_BINARY = "/usr/bin/yt-dlp";
+static const std::string YTDLP_BINARY = "/home/simon/.local/bin/yt-dlp";
 
-void DownloadFile()
+std::string GetAudioPath(const std::string& id) {
+    return "audio/" + id + ".ogg";
+}
+
+void DownloadFile(const std::string &id)
 {
     stx::ExecPipe ep;
 
-    std::string link = "https://music.youtube.com/watch?v=" + links.front();
+    std::string link = "https://music.youtube.com/watch?v=" + id;
 
-    std::vector<std::string> args = {YTDLP_BINARY, link.c_str(), "--extract-audio", "--audio-format", "vorbis", "-o", "%(id)s.%(ext)s"};
+    std::vector<std::string> args = {YTDLP_BINARY, link.c_str(), "--extract-audio", "--audio-format", "vorbis", "--audio-quality", "10", "-o", "audio/%(id)s.%(ext)s"};
 
     ep.add_exec(&args);
     ep.run();
 }
 
-float GetDuration()
+void DownloadFiles() {
+    for (const std::string& id : links) {
+        DownloadFile(id);
+    }
+}
+
+/**
+ * std::vector<std::string> args = {"/usr/bin/ffmpeg", "-hide_banner", "-loglevel", "panic", "-i", "pipe:0", "-b:a", "32k", "-map",
+        "a", "-c:a", "libopus", "-f", "ogg", "-y", "pipe:1"};
+ */
+
+float GetDuration(const std::string &id)
 {
     stx::ExecPipe ep;
 
-    std::string fileName = links.front() + ".ogg";
+    std::string fileName = GetAudioPath(id);
 
     std::vector<std::string> args = {"/usr/bin/ffprobe", "-v", "error", "-show_entries", "format=duration", "-of", "default=noprint_wrappers=1:nokey=1", fileName};
 
@@ -37,12 +63,54 @@ float GetDuration()
     return std::stof(output);
 }
 
+/**
+ * \brief Returns a random real number between min and max.
+ * \param min The minimum value.
+ * \param max The maximum value.
+ * \return A random real number between min and max.
+ */
+float GetRandomReal(float min, float max)
+{
+    static std::random_device randomDevice;
+    static std::mt19937 generator(randomDevice());
+    std::uniform_real_distribution<float> distrib(min, max);
+    return distrib(generator);
+}
+
+void ExtractAudio(const std::string &id, float begin, float end, const std::string& outputName)
+{
+    stx::ExecPipe ep;
+
+    std::vector<std::string> args = {"/usr/bin/ffmpeg", "-y", "-loglevel", "panic", "-i", GetAudioPath(id), "-ss", std::to_string(begin), "-to", std::to_string(end), outputName};
+
+    ep.add_exec(&args);
+    ep.run();
+}
+
+std::string GetRandomLink() {
+    return links.at(rand() % links.size());
+}
+
+void GenRandomChallenge() {
+    std::string randomLink = GetRandomLink();
+    float duration = GetDuration(randomLink);
+
+    float randomSeek = GetRandomReal(duration / 4.0f, duration * 3.0f / 4.0f);
+
+    ExtractAudio(randomLink, randomSeek, randomSeek + 0.5f, "challenges/1.ogg");
+    ExtractAudio(randomLink, randomSeek, randomSeek + 1.0f, "challenges/2.ogg");
+    ExtractAudio(randomLink, randomSeek, randomSeek + 1.5f, "challenges/3.ogg");
+    ExtractAudio(randomLink, randomSeek, randomSeek + 2.0f, "challenges/4.ogg");
+
+    std::cout << "Done !\n";
+}
+
+
 int main(int argc, char **argv)
 {
-
-    float duration = GetDuration();
-
-    std::cout << "Durée : " << duration << std::endl;
+    srand(time(0));
+    
+    GenRandomChallenge();
 
     return 0;
 }