diff --git a/.gitignore b/.gitignore
index bceb365..b40a346 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,6 +3,7 @@
 
 ### Audio ###
 *.aif
+*.amr
 *.flac
 *.iff
 *.m3u
diff --git a/compression/ctest/main.py b/compression/ctest/main.py
new file mode 100644
index 0000000..a660274
--- /dev/null
+++ b/compression/ctest/main.py
@@ -0,0 +1,15 @@
+import ctypes
+
+
+def avcodec_version():
+    f = ctypes.CDLL("libavcodec.so")
+
+    print(f.avcodec_version())
+
+
+def main():
+    avcodec_version()
+
+
+if __name__ == "__main__":
+    main()
diff --git a/compression/main.py b/compression/main.py
index 67e1401..e5b28ec 100755
--- a/compression/main.py
+++ b/compression/main.py
@@ -1,16 +1,60 @@
 #!/usr/bin/env python3
 
-import sys
+import subprocess
 
-from ffmpy import FFmpeg
+
+class FFmpeg:
+    input: str
+    output: str
+    format: str
+    bitrate: int | None
+    fpass: tuple[int, int] | None
+
+    def __init__(
+        self,
+        input="pipe:0",
+        output="pipe:1",
+        format="amr",
+        bitrate=None,
+        fpass=None,
+    ):
+        self.input = input
+        self.output = output
+        self.format = format
+        self.bitrate = bitrate
+        self.fpass = fpass
+
+    def __get_cmd(self) -> list[str]:
+        cmd = [
+            "ffmpeg",
+            "-i",
+            self.input,
+            "-f",
+            self.format,
+            "-ac",
+            "1",
+            "-ar",
+            "8000",
+        ]
+
+        if self.bitrate is not None:
+            cmd += ["-b:a", str(self.bitrate)]
+        if self.fpass:
+            cmd += [
+                "-filter:a",
+                f"highpass=f={self.fpass[0]},lowpass=f={self.fpass[1]}",
+            ]
+        return cmd + [self.output]
+
+    def run(self):
+        cmd = self.__get_cmd()
+
+        subprocess.Popen(cmd)
 
 
 def main():
-    ff = FFmpeg(
-        inputs={"pipe:0": None},
-        outputs={"pipe:1": "-ar 8000 -b:a 128k -f mp3"},
-    )
-    ff.run(input_data=sys.stdin.buffer.read())
+    ff = FFmpeg(bitrate=12200, fpass=[200, 3400])
+    ff.run()
 
 
 if __name__ == "__main__":
diff --git a/compression/requirements.txt b/compression/requirements.txt
deleted file mode 100644
index 0aafc23..0000000
--- a/compression/requirements.txt
+++ /dev/null
@@ -1 +0,0 @@
-ffmpy~=0.3