Video Conversion

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OverviewObjective

Learn how to convert videos using PVVideo class Requirements

Installed version of ffmpeg

Understanding of ffmpeg from ffmpeg tutorial

Understanding of the defines

Estimated Time

12 minutes

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Follow Along With A Code Example

1. Download a copy of the example code at www.prodigyview.com/source.

2.Install the system in an environment you feel comfortable testing in.

3.Proceed to examples/avi/Video_Conversion.php

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PVVideo

To begin this tutorial, we are going to initialize the PVVideo class. Initialization primary purpose to set the location of the ffmpeg on your server.

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Video ConversionThe most basic way of using the PVVideo class is converting a video. All that is required is the input video file and the location to output a new video file.

1. Input File to Convert

2. Location and name to save the converted file

OptionsWe will want to add options to our video conversion such as creating images, delayed start, duration, etc. To utilize the options, we need to first know the options that can be passed to FFMPEG. Review and reference them here.

http://ffmpeg.org/ffmpeg.html#Video-Options

If you are new to ffmpeg, please view the tutorial on using ffmpeg.

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Output OptionsAn option that is specified in ffmpeg video is -vcodec, which adds a codec to the conversion of the file. To add the options to our output file, we prefix the option in an array with ‘output_’ followed by the ffmpeg option to be used. Pass the option array to the conversion process.

FFMPEG vcodec option being applied to the output file

The options being applied to the conversion

Delay Start TimeThere maybe be instances where you want to delay the start time of your video. In FFMPEG this would be accomplished with the –ss option.

1. Delay start time by 20 seconds

2. Pass options

Making PreviewsIf we can delay our start time, we can also see for how long our video runs. In other words, we can make short snippet and previews of a video. We use the –t option in ffmpeg.

1. Delayed start time 2. Only convert 30 seconds

3. Pass options to conversion

Images Output

Up until now, we have dealt with video conversions to other video formats. We can further manipulate PVVideo options to convert video files to images. We are going to use the ffmpeg options, -r, -f, and –vframes.

1. Limit the number of images created to 20

2. Force to image format 3. Image name with 3 numeric format

Delayed Image OutputFor our final demonstration on how to use the options, we are going to make images with a delay and set amount. For this last slide, figure out what the options are based off the previous slides.

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More Tutorials

For more tutorials, please visit:

http://www.prodigyview.com/tutorials