Hello doquan0,
Thank you for your post.
I've checked version 6.1 and noticed that this version produces the waveform at our end, but it doesn't play the whole audio content at the end as you have described.
This will be checked and fixed by our developers in the near future.
According to the waveform construction, please check if the "Story board on" icon is turned on and the timeline is in the full height so the waveform could be shown (if it it was minimized please enlarge it by moving it up after clicking at timeline's upper edge). Do you receive any error messages on the opening of this file in Video Splitter 6.1?
PS: the file you have uploaded to Google drive is the .mp4 file, not .avi. Is this a right file?