OpenCV Python Tutorial For Beginners 4 - How to Read, Write, Show Videos from Camera in OpenCV

In this video on OpenCV Python Tutorial For Beginners, I am going to show How to Read, Write, Show Videos from Camera in OpenCV.
We will see How to read video, display video and save video,
How to capture from Camera and display it, we will see these functions : cv.VideoCapture(), cv.VideoWriter(). So we will Capture Video from Camera using opencv. So let us see How to process images of a video, frame by frame in video streaming using Opencv python.

VideoCaptureProperties

Python: cv.CAP_PROP_FRAME_WIDTH: Width of the frames in the video stream.

Python: cv.CAP_PROP_FRAME_HEIGHT: Height of the frames in the video stream.

Color image loaded by OpenCV is in BGR mode. But Matplotlib displays in RGB mode.

pip is a package management system used to install and manage software packages written in Python.
OpenCV is an image processing library created by Intel and later supported by Willow Garage and now maintained by Itseez. opencv is available on Mac, Windows, Linux. Works in C, C++, and Python.
it is Open Source and free. opencv is easy to use and install.

Starting with an overview of what the course will be covering, we move on to discussing morphological operations and practically learn how they work on images. We will then learn contrast enhancement using equalization and contrast limiting. Finally we will learn 3 methods to subtract the background from the video and implement them using OpenCV.

At the end of this course, you will have a firm grasp of Computer Vision techniques using OpenCV libraries. This course will be your gateway to the world of data science.

Feel the real power of Python and programming! The course offers you a unique approach of learning how to code by solving real world problems.

#ProgrammingKnowledge #ComputerVision #OpenCV
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[code-wise]

Thank you, you have students and followers from all around the world. Mexico is Here 🇲🇽

[michaelschone]

Hey saw your videos today. Very nice! I like ur openCV tuts GJ!
I´ll check the rest too. Thanks man. :)


sorry for my bad eng i have to learn no time for corrections :P

[paulmcwhorter]

When I try and write "gray" the converted frames, the .avi file is not playable . . . no errors but video will not play.

[hindujavelupula]

At the last clip the streamed gray video was converted to rgb how was it done ?

[eqjitnx]

Hello, sir:
I would like to set my frame to higher resolution, but it still set to be 640x480, how can i fix this problem, are there any solutions I can try?

[brpawankumariyengar]

Great Video Such good Explanation thank you very much

[sabit]

Sir how does your Output Window of Images or Front Camera is by default small in size. In my case, the moment I run the code my screen is filled by a Full Size Window. Are there any settings that need to be configured on PYCHARM????
And thankyou so much for this series ..Really Good...

[vardaankola]

I put out.write(frame) after cv2.imshow('frame', gray). The live video did come in gray, but that saved file is in color. How can I fix this?

[jadavpur]

From video input, how to generate images from that and then images processing for particle size distribution from the video? Thank you in advance..

[emilatinan]

OMG, it really worked. Thank you so much!!

[saurabhvaishya]

why do we require to install opencv in cmd and pycharm as well, cant we use same opencv in both places @ProgrammingKnowledge

[yicxel]

Excelente video, excelente informacion, bendicionesw desde Colombia. Me salvaste.

[AnalyticsAlly]

i followed each and every line as mentioned still i am getting error [ WARN:1] terminating async callback after this also if i press exc then only the frame moves forward and file format is not recognized still last video every thing was ok any one plz can help

[jakaphoenix]

Hi, I'm currently studying python and opencv.
I just wrote the code like in this video, but there is a warning message like this:

[ WARN:0] global (674) terminating async callback


what exactly is the meaning of that warning message? thank you for your help.

[error-myut]

Sir i tried one thing

Gr=cv.cvtColor(frame, cv.COLOR_BGR2GRAY)
out. write(frame)

But the video didn't came out gray instead it gave a corrupted file why???
This things worked with imshow() so why doesn't it works with this???

[RnFChannelJr]

can you explain how to auto-capture using ultrasonic sensor as trigger ?

[zeyadnabeelnajim-]

Dear Sir,
First of all, thank you for the information that you shared. Second, my Python is not taking the code to get the webcam working on the cv2.VideoCapture, I don't know why!. if you can help me in that to fix the way of getting thinks work that will be great. Third, the fourcc is not working in my code, I don't know why it counts only two variables and ends the code without showing the video or the output folder.
Thank you so much indeed

[rfbu]

I tried writing to 2nd file. First file is ok ie I can play back. 2nd file says error. Any thoughts? great tutorial

[cosmostrainingcenter]

but how i can save the file on any specific location please answer !

[lowqchannel]

hi, why is it when imshow the video become very fast? how to run at the source video speed ?