The Explanation Of Video Transcoding

With more people than ever sharing information

, files, videos and photographs through different mediums such as email, MMS, SMS and social networking there is a growing need for the information to be sent in a certain way that allows it to be viewed.

Where data, such as a video has been recorded or saved by the person who produced it into one format it might potentially be prevented from being read or seen by the intended recipient as a result of the limitation of the format.

This potential lack of sharing ability is often where the process of transcoding comes in.

How Transcoding Works

Transcoding is the direct (i.e. data to data) conversion of one format to another. The data in question can consist of anything from audio recordings to a movie. The process of transcoding is often performed because the intended recipient of the file is unable to support the information it is on the wrong format or because the intended destination does not have the required capacity to support it.

Transcoding, whilst sounding complex is in fact a relatively simple process which involves copying the existing file from one format into another and saving it in the new format.

The huge benefit of this is that the original owner of the file or document gets to retain the original file and simply has two copies, being the old and the new transcoded file, at the end of the process.

One of the more negative points however is the fact that transcoding is known as a Lossy Process.

What is a Lossy Process?

Lossy describes the loss of data which occurs during transcoding. The process which generally involves copying from one format to another streamlines the data in order to make it fit into the required format. This means shrinking the data and in so results in a loss.

This loss sounds extremely off-putting and can give the impression that transcoding is a bad process. It should however be said that the loss is only information, not the actual end result. In the case of a photograph which has been transcoded at a 15% loss, the loss will not be a 15% hole in the picture; but rather a 15% loss of data meaning fewer pixels will make up the total image. This can mean that the focus does not appear to be as sharp or outlines are not as clearly defined as they might be.

For example a photograph which was taken in High-Definition may arrive to the recipient appearing as though it had been taken and saved in standard definition.

Cautions

Although transcoding continues to be a popular and in many cases a necessary way in which formats can be changed on a file, there is some hesitance over the use. A lot of this hesitance is attributable to the Lossy Process as file sharers do not like having to compromise the quality of the data they are sharing.

by: Simon Gannon

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