diff --git a/abogen/utils.py b/abogen/utils.py
index f4308b7..acd580e 100644
--- a/abogen/utils.py
+++ b/abogen/utils.py
@@ -183,6 +183,8 @@ def get_user_cache_root():
         for env_var in ("HUGGINGFACE_HUB_CACHE", "TRANSFORMERS_CACHE"):
             os.environ.setdefault(env_var, hf_cache)
 
+        os.environ.setdefault("ABOGEN_INTERNAL_CACHE_ROOT", cache_base)
+
     cache_root = None
 
     override = os.environ.get("ABOGEN_TEMP_DIR")
@@ -217,6 +219,22 @@ def get_user_cache_root():
     return cache_root
 
 
+def get_internal_cache_root():
+    root = os.environ.get("ABOGEN_INTERNAL_CACHE_ROOT") or os.environ.get("XDG_CACHE_HOME")
+    if root:
+        return ensure_directory(root)
+    home_dir = os.environ.get("HOME") or os.path.join("/tmp", "abogen-home")
+    home_dir = ensure_directory(home_dir)
+    return ensure_directory(os.path.join(home_dir, ".cache"))
+
+
+def get_internal_cache_path(folder=None):
+    base = get_internal_cache_root()
+    if folder:
+        return ensure_directory(os.path.join(base, folder))
+    return base
+
+
 def get_user_cache_path(folder=None):
     base = get_user_cache_root()
     if folder:
diff --git a/abogen/web/conversion_runner.py b/abogen/web/conversion_runner.py
index de9aa03..e51dbcf 100644
--- a/abogen/web/conversion_runner.py
+++ b/abogen/web/conversion_runner.py
@@ -17,6 +17,7 @@ from abogen.text_extractor import ExtractedChapter, extract_from_path
 from abogen.utils import (
     calculate_text_length,
     create_process,
+    get_internal_cache_path,
     get_user_cache_path,
     get_user_output_path,
     load_config,
@@ -310,7 +311,8 @@ def _open_audio_sink(
     fmt: Optional[str] = None,
     metadata: Optional[Dict[str, str]] = None,
 ) -> AudioSink:
-    static_ffmpeg.add_paths()
+    ffmpeg_cache = get_internal_cache_path("ffmpeg")
+    static_ffmpeg.add_paths(download_dir=ffmpeg_cache)
     fmt_value = (fmt or job.output_format).lower()
 
     if fmt_value in {"wav", "flac"}: