As far as i remember it need additional programs installed on server (not sure), but there was some limitations that forced me develop my own MP3 editor :D
First of all, PHP is server side, Javascript is client side. You cannot detect mouse gestures or any clicks with PHP the same way you cannot read a file or modify it or process a form (unless you use AJAX of course). Also, although I love PHP, and it has useful extensions such as the GD library, PHP is not a very good language. Overall we use javascript and PHP because they are used for two completely different things.
We can use php tags in different ways. <?php //php code to be written here ?> OR <? //php code ?> This tag will not work when we using editors such as macromedia dreamweaver. OR < script language="php"> //php code </script>
To concatenate strings in PHP, you use the . (dot) character. For example: $str = "String1" . "String2";
Problem with using global variables in php is that they lose the the assigned value in a different php file. They only keep the global variable value in the php file in which they are declared. Instead of globals try and use $_SESSION or $_COOKIE to keep value intact across different php files in a project
this is not really a question... But I think you are asking why php functions inside a HTML button do not work. Well probably because php is rendered serverside and is passed to a user-browser afterwards.... it is possible to use php inside onclick... but only to display specific content (javascript function for instance)... it is not possible to let a user decide to run a specific php function by clicking a button.
To convert a 24-bit WAV file to a 16-bit WAV file using PHP, you can use the ffmpeg command-line tool. First, ensure that ffmpeg is installed on your server. Then, you can execute a shell command from PHP using the exec() function, like this: exec("ffmpeg -i input.wav -sample_fmt s16 output.wav");. This command reads the 24-bit WAV file and outputs a new 16-bit WAV file.
To open ffmpeg, you can use the command line interface on your computer and type "ffmpeg" followed by any desired options or commands to use the software for video and audio processing.
The error message "ffmpeg is not recognized" means that the system cannot find the ffmpeg command because it is not installed or the path to ffmpeg is not set correctly. You need to install ffmpeg or update the system's PATH variable to include the location of the ffmpeg executable.
You can use ffmpeg to get information about a video file by running the command "ffmpeg -i yourvideofile.mp4" in the terminal. This will display details such as video and audio codecs, resolution, duration, and more.
To install FFmpeg on your Windows system using Winget, you can open the command prompt and type "winget install ffmpeg" and press enter. This will download and install FFmpeg on your computer.
To install FFmpeg on Windows 10, you can download the latest version from the official FFmpeg website. Once downloaded, extract the files and add the FFmpeg bin directory to your system's PATH environment variable. This will allow you to use FFmpeg from the command line.
To use ffmpeg on Windows for video and audio processing, you can download the ffmpeg software from the official website and install it on your computer. Once installed, you can open a command prompt window and navigate to the directory where ffmpeg is installed. From there, you can use ffmpeg commands to process your video and audio files by specifying input and output files, as well as desired processing options.
To create a continuous video loop using the ffmpeg loop feature, you can use the "loop" option in the ffmpeg command followed by the number of times you want the video to loop. For example, you can use the command "ffmpeg -streamloop -1 -i input.mp4 output.mp4" to loop the video indefinitely.
To deinterlace a video file using ffmpeg, you can use the following command: ffmpeg -i inputvideo.mp4 -vf yadif1 outputvideo.mp4 This command will deinterlace the input video file and save the deinterlaced version as outputvideo.mp4.
To use ffmpeg for video editing and conversion, you can use command line instructions to specify the input and output files, as well as the desired editing or conversion options. You can trim, crop, resize, add effects, and change formats using ffmpeg commands. Make sure to refer to the ffmpeg documentation for specific commands and options.
To convert images to the JPEG 2000 format using ffmpeg, you can use the following command: ffmpeg -i inputimage.jpg -c:v libopenjpeg outputimage.jp2 This command will take an input image in JPEG format (inputimage.jpg) and convert it to the JPEG 2000 format (outputimage.jp2) using the libopenjpeg codec in ffmpeg.
It is used to tell the sever to use the PHP parser. To begin php you must use <?php, and to end it, it is ?>.