OpenCV | Loading Video Last Updated : 26 Aug, 2019 Comments Improve Suggest changes Like Article Like Report This article aims to learn how to display a video in OpenCV. To do so is a simple task just like displayed as a single image. But here, this display of frames have to be read in a loop as a part of the sequence. Lets's understand the complete process line by line in detail. Code : CPP CvCapture* capture = cvCreateFileCapture("...input\\video_file.avi"); cvCreateFileCapture() function takes name/path of the AVI file of the video (to be loaded as a parameter). Then a pointer to a CvCapture structure is returned. All the information about the video file is contained in this structure. The CvCapture structure gets initialised to the beginning of the video when created in this way. Code : CPP frame = cvQueryFrame(capture); The reading from video file begins once it is inside the while(1) loop. A pointer to a CvCapture structure is taken as an argument by the cvQueryFrame(). Then the next video frame is taken into the memory which is actually a part of CvCapture structure. And that particular frame requires the pointer. cvQueryFrame uses the already allocated memory present in the CvCapture structure, unlike the cvLoadImage that allocates actual memory for the image. Thus, calling a cvReleaseImage() is not necessary for this "frame" pointer. When the CvCapture structure is released, the frame image memory will be freed. Code : CPP c = cvWaitKey(10); if (c == 27) break; Waiting for 10ms after the frame is displayed. c will be set to the ASCII value of the pressed key if a user hits that particular key. Otherwise, it is set to '-1'. If ESC key (having an ASCII value of 27) is pressed by the user, then the code will exit the read loop. Otherwise, after 10ms are passed, the loop is executed again. Code : Display video using OpenCV. CPP // Using OpenCV to display video #include <highlevelmonitorconfigurationapi.h> #include <opencv2\highgui\highgui.hpp> #include <opencv2\opencv.hpp> using namespace cv; using namespace std; iint main(int argc, char** argv) { // creating window cvNamedWindow("Display_video", CV_WINDOW_AUTOSIZE); // loading video CvCapture* capture = cvCreateFileCapture("..input\\tree.avi"); IplImage* frame; while (1) { frame = cvQueryFrame(capture); if (!frame) break; cvShowImage("Display_video", frame); char c = cvWaitKey(0); if (c == 27) break; } cvReleaseCapture(&capture); // destroying window cvDestroyWindow("Display_video"); } Output : VIDEO OUTPUT IN THE DISPLAY WINDOW In the code above we are actually controlling the speed of the video in a very intelligent manner, we are just relying on the timer in cvWaitKey() for controlling the pace of frames to load. Comment More infoAdvertise with us Next Article Introduction to C++ Programming Language M mathemagic Follow Improve Article Tags : Computer Subject C++ OpenCV Practice Tags : CPP Similar Reads C++ Programming Language C++ is a computer programming language developed by Bjarne Stroustrup as an extension of the C language. It is known for is fast speed, low level memory management and is often taught as first programming language. It provides:Hands-on application of different programming concepts.Similar syntax to 5 min read C++ OverviewIntroduction to C++ Programming LanguageC++ is a general-purpose programming language that was developed by Bjarne Stroustrup as an enhancement of the C language to add object-oriented paradigm. It is considered as a middle-level language as it combines features of both high-level and low-level languages. It has high level language featur 3 min read Features of C++C++ is a general-purpose programming language that was developed as an enhancement of the C language to include an object-oriented paradigm. It is an imperative and compiled language. C++ has a number of features, including:Object-Oriented ProgrammingMachine IndependentSimpleHigh-Level LanguagePopul 5 min read History of C++The C++ language is an object-oriented programming language & is a combination of both low-level & high-level language - a Middle-Level Language. The programming language was created, designed & developed by a Danish Computer Scientist - Bjarne Stroustrup at Bell Telephone Laboratories ( 7 min read Interesting Facts about C++C++ is a general-purpose, object-oriented programming language. It supports generic programming and low-level memory manipulation. Bjarne Stroustrup (Bell Labs) in 1979, introduced the C-With-Classes, and in 1983 with the C++. 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It is the basic program that demonstrates the working of the coding process. All you have to do is display the message "Hello World" on the outpu 4 min read C++ Basic SyntaxSyntax refers to the rules and regulations for writing statements in a programming language. They can also be viewed as the grammatical rules defining the structure of a programming language.The C++ language also has its syntax for the functionalities it provides. Different statements have different 4 min read C++ CommentsComments in C++ are meant to explain the code as well as to make it more readable. Their purpose is to provide information about code lines. When testing alternative code, they can also be used to prevent execution of some part of the code. Programmers commonly use comments to document their work.Ex 3 min read Tokens in CIn C programming, tokens are the smallest units in a program that have meaningful representations. 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This process is called typecasting where the type of the data is changed to another type either implicitly (by the compiler) or explicitly (by the programmer).Let's take a look at an example:C++# 5 min read C++ OperatorsOperators in C++C++ operators are the symbols that operate on values to perform specific mathematical or logical computations on given values. They are the foundation of any programming language.Example:C++#include <iostream> using namespace std; int main() { int a = 10 + 20; cout << a; return 0; }Outpu 9 min read C++ Arithmetic OperatorsArithmetic Operators in C++ are used to perform arithmetic or mathematical operations on the operands (generally numeric values). An operand can be a variable or a value. For example, ‘+’ is used for addition, '-' is used for subtraction, '*' is used for multiplication, etc. Let's take a look at an 4 min read Unary Operators in CIn C programming, unary operators are operators that operate on a single operand. These operators are used to perform operations such as negation, incrementing or decrementing a variable, or checking the size of a variable. They provide a way to modify or manipulate the value of a single variable in 5 min read Bitwise Operators in CIn C, bitwise operators are used to perform operations directly on the binary representations of numbers. These operators work by manipulating individual bits (0s and 1s) in a number.The following 6 operators are bitwise operators (also known as bit operators as they work at the bit-level). They are 6 min read Assignment Operators in CIn C, assignment operators are used to assign values to variables. The left operand is the variable and the right operand is the value being assigned. The value on the right must match the data type of the variable otherwise, the compiler will raise an error.Let's take a look at an example:C#include 4 min read C++ sizeof OperatorThe sizeof operator is a unary compile-time operator used to determine the size of variables, data types, and constants in bytes at compile time. It can also determine the size of classes, structures, and unions.Let's take a look at an example:C++#include <iostream> using namespace std; int ma 3 min read Scope Resolution Operator in C++In C++, the scope resolution operator (::) is used to access the identifiers such as variable names and function names defined inside some other scope in the current scope. 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It is associated with the standard C output stream stdout. The insertion operator (<<) is used with cout to insert data into the output stream.Let's take a look at 2 min read Standard Error Stream Object - cerr in C++In C++, cerr is the standard error stream used to output the errors. It is an instance of the ostream class and is un-buffered, so it is used when we need to display the error message immediately and does not store the error message to display later. The 'c' in cerr refers to "character" and 'err' m 3 min read Manipulators in C++Manipulators are helping functions that can modify the input or output stream. They can be included in the I/O statement to alter the format parameters of a stream. They are defined inside <iomanip> and some are also defined inside <iostream> header file. For example, if we want to print 4 min read C++ Control StatementsDecision Making in C (if , if..else, Nested if, if-else-if )In C, programs can choose which part of the code to execute based on some condition. This ability is called decision making and the statements used for it are called conditional statements. These statements evaluate one or more conditions and make the decision whether to execute a block of code or n 7 min read C++ if StatementThe C++ if statement is the most simple decision-making statement. It is used to decide whether a certain statement or block of statements will be executed or not executed based on a certain condition. Let's take a look at an example:C++#include <iostream> using namespace std; int main() { int 3 min read C++ if else StatementThe if statement alone tells us that if a condition is true it will execute a block of statements and if the condition is false, it won’t. But what if we want to do something else if the condition is false. Here comes the C++ if else statement. We can use the else statement with if statement to exec 3 min read C++ if else if LadderIn C++, the if-else-if ladder helps the user decide from among multiple options. The C++ if statements are executed from the top down. As soon as one of the conditions controlling the if is true, the statement associated with that if is executed, and the rest of the C++ else-if ladder is bypassed. I 3 min read Switch Statement in C++In C++, the switch statement is a flow control statement that is used to execute the different blocks of statements based on the value of the given expression. It is a simpler alternative to the long if-else-if ladder.SyntaxC++switch (expression) { case value_1: // code to be executed. break; case v 5 min read Jump statements in C++Jump statements are used to manipulate the flow of the program if some conditions are met. It is used to terminate or continue the loop inside a program or to stop the execution of a function.In C++, there is four jump statement:Table of Contentcontinue Statementbreak Statementreturn Statementgoto S 4 min read C++ LoopsIn C++ programming, sometimes there is a need to perform some operation more than once or (say) n number of times. For example, suppose we want to print "Hello World" 5 times. Manually, we have to write cout for the C++ statement 5 times as shown.C++#include <iostream> using namespace std; int 7 min read for Loop in C++In C++, for loop is an entry-controlled loop that is used to execute a block of code repeatedly for the given number of times. It is generally preferred over while and do-while loops in case the number of iterations is known beforehand.Let's take a look at an example:C++#include <bits/stdc++.h 6 min read Range-Based for Loop in C++In C++, the range-based for loop introduced in C++ 11 is a version of for loop that is able to iterate over a range. This range can be anything that is iteratable, such as arrays, strings and STL containers. It provides a more readable and concise syntax compared to traditional for loops.Let's take 3 min read C++ While LoopIn C++, the while loop is an entry-controlled loop that repeatedly executes a block of code as long as the given condition remains true. Unlike the for loop, while loop is used in situations where we do not know the exact number of iterations of the loop beforehand as the loop execution is terminate 3 min read C++ do while LoopIn C++, the do-while loop is an exit-controlled loop that repeatedly executes a block of code at least once and continues executing as long as a given condition remains true. Unlike the while loop, the do-while loop guarantees that the loop body will execute at least once, regardless of whether the 4 min read C++ FunctionsFunctions in C++A Function is a reusable block of code designed to perform a specific task. It helps break large programs into smaller, logical parts. Functions make code cleaner, easier to understand, and more maintainable.Just like in other languages, C++ functions can take inputs (called parameters), execute a b 8 min read return Statement in C++In C++, the return statement returns the flow of the execution to the function from where it is called. This statement does not mandatorily need any conditional statements. As soon as the statement is executed, the flow of the program stops immediately and returns the control from where it was calle 4 min read Parameter Passing Techniques in CIn C, passing values to a function means providing data to the function when it is called so that the function can use or manipulate that data. Here:Formal Parameters: Variables used in parameter list in a function declaration/definition as placeholders. Also called only parameters.Actual Parameters 3 min read Difference Between Call by Value and Call by Reference in CFunctions can be invoked in two ways: Call by Value or Call by Reference. These two ways are generally differentiated by the type of values passed to them as parameters.The following table lists the differences between the call-by-value and call-by-reference methods of parameter passing.Call By Valu 4 min read Default Arguments in C++A default argument is a value provided for a parameter in a function declaration that is automatically assigned by the compiler if no value is provided for those parameters in function call. If the value is passed for it, the default value is overwritten by the passed value.Example:C++#include <i 5 min read Inline Functions in C++In C++, inline functions provide a way to optimize the performance of the program by reducing the overhead related to a function call. When a function is specified as inline the whole code of the inline function is inserted or substituted at the point of its call during the compilation instead of us 6 min read Lambda Expression in C++C++ 11 introduced lambda expressions to allow inline functions which can be used for short snippets of code that are not going to be reused. Therefore, they do not require a name. They are mostly used in STL algorithms as callback functions.Example:C++#include <iostream> using namespace std; i 4 min read C++ Pointers and ReferencesPointers and References in C++In C++ pointers and references both are mechanisms used to deal with memory, memory address, and data in a program. Pointers are used to store the memory address of another variable whereas references are used to create an alias for an already existing variable. Pointers in C++ Pointers in C++ are a 5 min read C++ PointersA pointer is a special variable that holds the memory address of another variable, rather than storing a direct value itself. Pointers allow programs to access and manipulate data in memory efficiently, making them a key feature for system-level programming and dynamic memory management. When we acc 8 min read Dangling, Void , Null and Wild Pointers in CIn C programming pointers are used to manipulate memory addresses, to store the address of some variable or memory location. But certain situations and characteristics related to pointers become challenging in terms of memory safety and program behavior these include Dangling (when pointing to deall 6 min read Applications of Pointers in CPointers in C are variables that are used to store the memory address of another variable. Pointers allow us to efficiently manage the memory and hence optimize our program. In this article, we will discuss some of the major applications of pointers in C. Prerequisite: Pointers in C. C Pointers Appl 4 min read Understanding nullptr in C++Consider the following C++ program that shows problem with NULL (need of nullptr) CPP // C++ program to demonstrate problem with NULL #include <bits/stdc++.h> using namespace std; // function with integer argument void fun(int N) { cout << "fun(int)"; return;} // Overloaded fun 3 min read References in C++In C++, a reference works as an alias for an existing variable, providing an alternative name for it and allowing you to work with the original data directly.Example:C++#include <iostream> using namespace std; int main() { int x = 10; // ref is a reference to x. int& ref = x; // printing v 5 min read Can References Refer to Invalid Location in C++?Reference Variables: You can create a second name for a variable in C++, which you can use to read or edit the original data contained in that variable. While this may not sound appealing at first, declaring a reference and assigning it a variable allows you to treat the reference as if it were the 2 min read Pointers vs References in C++Prerequisite: Pointers, References C and C++ support pointers, which is different from most other programming languages such as Java, Python, Ruby, Perl and PHP as they only support references. But interestingly, C++, along with pointers, also supports references. On the surface, both references and 5 min read Passing By Pointer vs Passing By Reference in C++In C++, we can pass parameters to a function either by pointers or by reference. In both cases, we get the same result. So, what is the difference between Passing by Pointer and Passing by Reference in C++?Let's first understand what Passing by Pointer and Passing by Reference in C++ mean:Passing by 5 min read When do we pass arguments by pointer?In C, the pass-by pointer method allows users to pass the address of an argument to the function instead of the actual value. This allows programmers to change the actual data from the function and also improve the performance of the program. In C, variables are passed by pointer in the following ca 5 min read Like