Avoid adding tail padding for VAD in generate-subtitles.py (#1674)

@@ -516,16 +516,13 @@ def main():
 
 
     is_eof = False
     is_eof = False
     # TODO(fangjun): Support multithreads
     # TODO(fangjun): Support multithreads
-    while True:
+    while not is_eof:
         # *2 because int16_t has two bytes
         # *2 because int16_t has two bytes
         data = process.stdout.read(frames_per_read * 2)
         data = process.stdout.read(frames_per_read * 2)
         if not data:
         if not data:
-            if is_eof:
-                break
+            vad.flush()
             is_eof = True
             is_eof = True
-            # pad 1 second at the end of the file for the VAD
-            data = np.zeros(1 * args.sample_rate, dtype=np.int16)
-
+        else:
             samples = np.frombuffer(data, dtype=np.int16)
             samples = np.frombuffer(data, dtype=np.int16)
             samples = samples.astype(np.float32) / 32768
             samples = samples.astype(np.float32) / 32768
 
 
@@ -536,9 +533,6 @@ def main():
                 vad.accept_waveform(buffer[:window_size])
                 vad.accept_waveform(buffer[:window_size])
                 buffer = buffer[window_size:]
                 buffer = buffer[window_size:]
 
 
-        if is_eof:
-            vad.flush()
-
         streams = []
         streams = []
         segments = []
         segments = []
         while not vad.empty():
         while not vad.empty():