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What Is Transcoding?

Published:2019/11/8 11:46:46 Visits:

What Is Transcoding?


First, the word transcoding is commonly used as an umbrella term that covers a number of digital media tasks:

·        Transcoding, at a high level, is taking already-compressed (or encoded) content; decompressing (decoding) it; and then somehow altering and recompressing it. As an example, you might change the audio and/or video format (codec) from one to another, such as converting from an MPEG2 source (commonly used in broadcast television) to H.264 video and AAC audio (the most popular codecs for streaming). Other basic tasks could include adding watermarks, logos or other graphics to your video.

·        Transrating refers specifically to changing bitrates, such as taking a 4K video input stream at 13 Mbps and converting it into one or more lower-bitrate streams (also known as renditions): HD at 6Mbps, or other renditions at  3 Mbps, 1.8 Mbps, 1 Mbps, 600 kbps etc.

·        Trans-sizing refers specifically to resizing the video frame; say, from a resolution of 3840 pixels × 2160 (4K UHD) down to 1920×1080 (1080p) or 1280×720 (720p).

Why Transcoding A Video?

Video Transcoding is the name used to refer to the digital to digital conversion of data. Most of the times, transcoding a video is done due to some of the circumstances listed below:

·        When the target device does not support the format that the original data is in.

·        When the target device has a reduced capacity such that the capacity of the original file will have to be reduced so that it can fit to the new format.

·        In order to convert incompatible and obsolete file types into a modern format that is better supported by the new device.

The process of video transcoding is normally a two-step process. The first part of the process is decoding. This is whereby the original data is transferred to an uncompressed format. The second part of the process is the re-encoding whereby the data will now be transferred to the new device in the desired format.

One of the most important reasons why video transcoding is done is when you need to transfer or upload files onto websites and other video sharing sites, such as YouTube or Vimeo. In this case, you will need to transcode the data in the video into one of the formats that are supported by the particular site. The other major application of video transcoding is when you need upload files into your own website. You have to make sure that you upload videos in the format that is most appropriate for your site. The third application is when you want to transfer video content from one device to another. Transcoding is also used in the home in the home PC software when you want to transcode say MPEG-2 files into either MPEG-4 or H.264 format.


When Should Be Using Video Transcoding?


63 percent of streaming video viewers in 2017 cited buffering issues as the most serious problem they encounter. That number is an increase from the 2016 numbers. This points to a very serious issue with online video: providing a good quality video streaming experience to all your users. One of the best ways to deal with this is by using video transcoding.

Video transcoding is the process of creating multiple versions of the same video. These different versions are optimized for different users. Ideally, this solution allows you to deliver high-quality videos to users with fast internet, and lower-resolution videos to those with slow internet. The result: no buffering.

This article will dive more deeply into video transcoding. We’ll discuss how transcoding works, how to maximize QoE for viewers, transcoding locally vs in the cloud, and more. We’ll finish the article by looking at how to deliver video in multiple bitrates to ensure that everyone gets the best possible experience

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