[fbsync] Fix append of audio_pts (#5488)

Summary: Co-authored-by: Prabhat Roy <[email protected]>

Reviewed By: datumbox

Differential Revision: D34579501

fbshipit-source-id: 306c2c51f5d00a4f3c68770f42d8b6b04f68afb3

Author: prabhat00155

gallery/plot_video_api.py

@@ -158,7 +158,7 @@ def example_read_video(video_object, start=0, end=None, read_video=True, read_au
         frames = []
         for frame in itertools.takewhile(lambda x: x['pts'] <= end, video_object.seek(start)):
             frames.append(frame['data'])
-            video_pts.append(frame['pts'])
+            audio_pts.append(frame['pts'])
         if len(frames) > 0:
             audio_frames = torch.cat(frames, 0)