Learn how to use the video conversion in ProdigyView. In this video learn about delayed start times, setting duration, and images from videos.

1. Video Conversion
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2. Overview
Objective
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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3. 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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4. 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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5. Video Conversion
The 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

6. Options
We 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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7. Output Options
An 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

8. Delay Start Time
There 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

9. Making Previews
If 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

10. 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

11. Delayed Image Output
For 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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12. More Tutorials
For more tutorials, please visit:
http://www.prodigyview.com/tutorials
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