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app.py

@@ -1102,12 +1102,24 @@ with gr.Blocks(theme=THEME, title="TranscribeAI", css=CUSTOM_CSS, head=UPLOAD_PR
             docx_file = gr.File(label="DOCX — Dokumen Word berwarna")
 
     # ---- Connect ----
+    # Step 1: Validate audio exists (quick, no GPU).
+    #         If error → chain stops → timer never starts.
+    # Step 2: Start timer (JS) + run transcription (GPU).
+    # Step 3: Stop timer on success (JS).
+    def validate_audio(audio_file):
+        if audio_file is None:
+            raise gr.Error("Upload file audio terlebih dahulu!")
+
     btn_start.click(
+        fn=validate_audio,
+        inputs=[audio_input],
+        outputs=None,
+    ).then(
         fn=transcribe_full,
         inputs=[audio_input, language_choice, speaker_count,
                 enable_diarization, enable_vad],
         outputs=[summary_output, transcript_output, srt_file, txt_file, docx_file],
-        js="() => { if(document.querySelector('.audio-upload audio, .audio-upload .waveform-container')) window.startTranscribeTimer(); }",
+        js="() => { window.startTranscribeTimer(); }",
     ).then(
         fn=lambda: None,
         inputs=None,