Charlih Chen

My Photo
Location: Cupertino, California, United States

I'm orignal from Taiwan.

Sunday, February 28, 2021

How to make a Karaoke video with 2 audio tacks something like track1 and track2?

[ HAVE TO use mp2 as track2(aka. No vocal music) ]
By using MediaCoder to convert MP3 to mp2
By using MKVToolNix to multiplexing MP4 and MP2.

They can be download at

Monday, November 23, 2020

Take off drone 5 steps

Take off needed at least 9 satellites show on Remote Controller(RC)
起飛需要至少 9 顆衛星顯示在遠端控制器(RC)上

Take off drone 5 steps:

1. Press the top switch of the drone

2. Turn on the power switch of the RC

3. Push the left rocker upward and then pull down to matching frequency between drone and RC

4. Press the geomagnetic calibration button once the drone indicator lights are blue and red flashing slowly

5. Pick up the drone and make horizontal clockwise rotation 3 laps. You will hear a drop beep in the RC and red & blue lights flash.

Rotate the drone vertically for 3 laps. You will hear a drop beep in the RC and red & blue lights for long time.

(Above 2 steps meaning the calibration complete)

無人機起飛前的 5 個步驟: 

1. 按下無人機上面的開關。

2. 打開 遙控器(RC) 的電源開關。

3. RC的左搖桿向上推,然後向下拉, 如此來匹配無人機和 RC 之間的頻率。

4. 請按(Geomagnetic Calibration button)地磁校準按鈕, 無人機指示燈將呈藍色,紅色緩慢閃爍。

5. 拿起無人機,水平順時針旋轉3圈。您將在 RC 中聽到一滴蜂鳴音, 紅色和藍色指示燈閃爍。 垂直旋轉無人機3圈。你會聽到一滴蜂鳴聲在Rc和紅色和藍色燈很長一段時間。 (以上 2 個步驟表示校準完成)

Labels: , , , ,

How to pull out of the ZEN Mini XS818 GPS drone battery?

 ZEN Mini XS818 GPS drone AKA. Teeggi VISUO XS818 GPS drone.

   As drone landing position, the back of Drone has the Off/On sign that is the battery.
In order to pull the battery out, you have to push down "On" sign of the latch.

Labels: , , , ,

Monday, July 20, 2020

Don't waste your Smog test money (around $30) if your car battery died recently.

My car seldom drive and battery died out few week ago due to the COVID19 pandemic shelter-in-place situation. The SMOG test failed and the tester told me to test it again after drove 100 miles later. The failed test  due to battery died and wiped out some kind of car information for the test.
So, if your car has the same situation, drive it more than 100 miles, and then do the SMOG test.
Re-test passed after drove 100 miles. Just charged 10 buck from the same vendor.

Labels: , , , , ,

Tuesday, July 07, 2020

Why FortiAP keeps getting as DHCP IP?

Question: Why FortiAP keeps getting as DHCP IP?
Answer: most likely it was caused by the defective CAT5 coupler.

Labels: , ,