How to control the bitrate of youtube video on the go

Question

I am using PHP as server side scripting. I want to know , How to control the quality of a video using php. Here is what i want to do.

I will capture a video using any device and upload to server, and while retrieving the video i would like to provide some options for the quality of a video to be displayed. Similar to how youtube provide some settings 240p,260p,480p etc

many thanks

Answer 1

You could use software such as wowza to do converting on the fly (http://www.wowza.com/)

Alternatively you could convert your uploaded video (straight after upload) by shelling out to ffmpeg.

exec("ffmpeg -i $input -b 128k $output", $output);

and then link to the different video files depending on selected bitrate.