Tiandu Police Station

After about half an hour, Ye Xiaoworm, who went to the warehouse to get the surveillance video, and Officer Liang, who went to the office to get a laptop, returned to the lounge one after another, which made Gu Fan and Xiao Zihan, who were waiting on the sofa, feel refreshed. Pen, fun, pavilion www. biquge。 info

"Lao Liang, put the laptop next to the desktop. Yes, side by side. Gu Fan instructed Officer Liang to place the notebook he brought on the side of the desktop, and then took over the USB flash drive in Ye Xiaoworm's hand to store the video recordings.

"Click-"

Gu Fan plugged the USB flash drive into the corresponding interface of the laptop, found the video file, and then clicked the play button.

It is no different from the surveillance video obtained from the Cyber Security Bureau, in which Wang Changming still walked out of the study at 14:20 and returned from outside at 14:25.

Ye Xiaoworm looked at the computer screen and pouted: "It's no difference." ”

"Not necessarily." Xiao Zihan smiled meaningfully.

As if to verify Xiao Zihan's words, Gu Fan did not give up, but dialed the video recording in the laptop back to 14:20, the moment when Wang Changming just walked out of the study.

Then he turned on the desktop computer that had just been dormant and turned the time of the video recording on the desktop back to 14:20.

Gu Fan corresponded the time on both sides, and kept adjusting it until the two Wang Changming in the video acted in unison, and then stopped adjusting.

"Now, let's know if my guess is wrong." Gu Fan exhaled and played the two paused video points at the same time......

In the two video recordings, Wang Changming stood up from his seat at the same time, opened the door of the study, and walked out, the picture was surprisingly consistent.

And in the next five minutes, the study room was empty, but Gu Fan didn't fast forward, just stared at the two empty computer screens, frowning and pondering.

"Hey, what can you see from that." Ye Xiaoworm felt a little dull and couldn't help but shout.

But Officer Liang on the side suddenly widened his eyes and suddenly realized: "I see! ”

"What...... What it is. ”

"Look closely, and the truth will come out immediately."

Ye Xiaoworm looked at the two screens with some suspicion, the time in the lower left corner was exactly 14:25, and for a moment, he couldn't help but open his mouth wide, pointing to what happened on the two screens in disbelief: "This...... It's ......"

In the two screens, Wang Changming walked into the study from outside the door, but it was obvious in the video recording that the movements of the two were not synchronized, but there were extremely slight differences!

"Smack!"

Gu Fan paused the two videos at the same time, and fixed the picture at the moment when Wang Changming walked back to his seat.

Then he exhaled lightly and sighed: "Sure enough! ”

"My speculation is right, whether it is the surveillance video of the Cyber Security Bureau or the surveillance video backed up by Wang Changming's home, they have all been passive."

"Chief Gu is worthy of being the ace agent in the local police station before! It's not easy! Officer Liang touched his somewhat bald head and praised it sincerely.

"Wait...... Wait a minute. Ye Xiaoworm was obviously still in a state of confusion, and seeing that the other three people in the room had comprehension smiles on their faces, he couldn't help but shout: "Can anyone explain to me what the hell is going on?" ”

"Little worm, do you remember the first time we went to ask Wang Changming?" Gu Fan clasped his fingers and said lightly: "Wang Changming himself said at the time that the surveillance video in the study was his only alibi. ”

"I didn't realize at the time that the study was the only place in his house that was monitored."

"When I realized this, I already had doubts in my heart...... Why did Wang Changming just stay in the study with the surveillance on to read during the time when Yi Siyue was killed? ”

"So you suspect there's something wrong with the video?" The leaf worm exclaimed.

"That's right." Gu Fan nodded, and continued: "But the evidence we used is the real-time surveillance video recording of the National Cyber Security Bureau, which is logically extremely credible, and there is no reason to be manipulated, but the suspicion of this alibi in my heart cannot be dissipated for a long time......"

"That's why I came up with this way to test its authenticity."

"Uh...... So...... What method are you using......" The leaf worms obviously didn't quite understand yet.

"I found out at the last minute, too." Officer Liang was obviously in a good mood at this time, and before Gu Fan could speak, he preemptively explained to his boss: "Actually, the principle is very simple. Let's assume that the surveillance video of the Cyber Security Bureau and the video backup of Wang Changming's home were all passive...... So how do you do it? ”

"Clip." Xiao Zihan added on the side.

"Not bad! It's the clip! Officer Liang nodded: "If Wang Changming really used the upper bathroom as an excuse to kill Miss Yi Siyue, then the time spent in the middle would definitely be more than five minutes!" ”

"So where did all this time go?"

"Obviously, if you follow this line of thought, it is not difficult to come to a conclusion, and this period of time in the middle was cut off by Wang Changming."

"Therefore, in the edited video footage, Wang Changming seems to have only been out for five minutes, but if the time that was cut is added, then the alibi prepared by Wang Changming is not enough to be trusted!"

"Going back to the video recordings, since we already have this hypothesis, how do we prove that both surveillance footage have been edited?"

"In fact, the principle is very simple, this kind of home monitoring, the accurate value of the last time is only stopped at the number of seconds...... If Wang Changming really bought off the Cyber Security Bureau and asked one of them to help him edit the video, then the agreed editing time between the two could only be accurate to the second! ”

"It's fine if you only watch a single video, but if you play two videos edited by different people together and play them simultaneously......"

"Then ......" Gu Fan continued: "Unless it is an extreme coincidence, there will definitely be subtle differences between the two edited videos that are visible to the naked eye!" ”

"So far, ......"

"Wang Changming's alibi has expired!"

"Lao Liang!"

Gu Fan Huoran got up, turned his head to Officer Liang and said, "Prepare the car and arrest warrant immediately, let's go directly to the Academy of Sciences!" ”

"Understood!"

"Wait!"

Just as Officer Liang was about to turn around, Gu Fan stopped him again: "Help me prepare two arrest warrants." ”

"Two ...... Two copies? Officer Liang was stunned and said, "Why do you want to prepare two copies?" ”

"Don't forget, there is also a person who tampered with the video files in the Cyber Security Bureau for Wang Changming." Gu Fan said coldly.

"Do you already have a suspicion?"

"No...... I've pretty much been able to confirm that. ”

Gu Fan stood with his arms around and said in a condensed voice: "That person is Ye Chang nine times out of ten!" ”

"Yes...... But Ye Chang did not hold any position in the Cyber Security Bureau, how could he help Wang Changming tamper with video files? ”

"Don't forget, Ye Changke is a doctor of physics and computer science...... Gu Fan said slowly: "As a physicist, he is also a top hacker." ”