Update app.py

app.py

@@ -6,6 +6,17 @@ import glob
 import shutil
 import gradio as gr
 
+ffmpeg_path = shutil.which("ffmpeg")
+fdkaac_path = os.path.abspath("./fdkaac")
+yt_dlp_path = shutil.which("yt-dlp")
+
+if not ffmpeg_path:
+    raise FileNotFoundError("FFmpeg not found in PATH.")
+if not yt_dlp_path:
+    raise FileNotFoundError("yt-dlp not found in PATH.")
+if not os.path.isfile(fdkaac_path):
+    raise FileNotFoundError("fdkaac binary not found in current directory.")
+
 os.system("chmod +x fdkaac")
 accel = 'auto'
 video_base_opts = ['-crf', '63', '-c:v', 'libx264', '-tune', 'zerolatency']
@@ -47,8 +58,8 @@ async def convert_video_task(input_path, downscale, faster, use_mp3):
 
     # Compress WAV → AAC with local fdkaac
     await run_subprocess([
-        './fdkaac', '-b', '1k', '-C', '-f', '2', '-G', '1', '-w', '8000',
-        '-o', audio_output, audio_wav
+    fdkaac_path, '-b', '1k', '-C', '-f', '2', '-G', '1', '-w', '8000',
+    '-o', audio_output, audio_wav
     ])
 
     # Compress video with extreme low quality
@@ -67,7 +78,7 @@ async def process_conversion(use_youtube, youtube_url, video_file, downscale, fa
         if use_youtube:
             yt_uuid = str(uuid.uuid4())
             yt_out = os.path.join(UPLOAD_FOLDER, yt_uuid + ".%(ext)s")
-            yt_cmd = ['yt-dlp', '-o', yt_out, '-f', 'b', youtube_url]
+            yt_cmd = [yt_dlp_path, '-o', yt_out, '-f', 'b', youtube_url]
             await run_subprocess(yt_cmd)
             pattern = os.path.join(UPLOAD_FOLDER, yt_uuid + ".*")
             files = glob.glob(pattern)