Transcoding and Why Is It Critical for Streaming

Streaming media is booming and everyone is getting onboard. A 2015 report by Cisco predicted that in 2016, 6.1 exabytes of data had been to be consumed on mobile platforms. It was expected to rise to 9.6 exabytes in 2017 and soar to 15.2 exabytes in 2018. Without knowing the exact numbers, it is safe to say the demand and development will continue.

In case you’re concerned with streaming media, you either know all about video transcoding, otherwise you’re wondering why you keep hearing about it. If you happen to aren’t certain you need it, that places you within the second camp. An understanding of video transcoding and easy methods to do it is critical for any success with streaming video; particularly if you could deliver streaming video to quite a lot of totally different devices.

What is Video Transcoding?

Video transcoding, generally called video encoding, is the conversion from one digital encoding format to a different, reminiscent of for film data files. This entails translating all three parts of a digital video on the similar time — the file format, the video, and the audio.

This is a vital perform when a goal device doesn’t help the present format of your media, or has limited storage capacity that requires a reduced file dimension (think going from WMV to MP4). It is usually used to convert incompatible or out of date data to a greater-supported, read newer, video format.

Why is Transcoding Critical?

Video transcoding is critical while you need your content material to reach more end users.

For instance, you’re preparing to do a live stream out of your office. It’s a possibility that you simply’re capturing webcam audio and video with a browser-primarily based desktop application like Adobe Flash, which generates 1080p H.264 video and Speex audio.

Your show will likely be delivered live to online viewers; nevertheless, an try and stream it directly can have problems:

Those viewing without adequate bandwidth won’t be able to view the stream — they’ll be watching the ‘buffering’ circle.

In order to render the Speex audio, most people might want to watch utilizing Flash Player on a computer. Now you’ve just excluded almost anybody with slower data speeds, tablets, and mobile phones.

With video transcoding, you’ll be able to create a set of time-aligned video streams, every with a different bitrate and frame measurement, while changing the Speex audio to AAC audio. This group of streams is internet-friendly, allowing you attain virtually any screen on the planet.

How is Video Transcoding Finished?

Video begins life in a format distinctive to the camera or program used to capture your images and sounds. This is typically not the format wanted to deliver the video on-line or play it from one other device. Video transcoding is used to vary the unique format into one permitting the video and audio to play properly on a consumer’s units — be they laptop, tablet, smartphone, or tv.

Video encoding, or video transcoding, involves a -step process. First, the original file is decoded to an uncompressed format. Second, this uncompressed format is then encoded into the goal format.

What are Codecs and File Types in Video Transcoding?

When talking about video transcoding, we refer to file formats, file types, and something called codecs.

Video format specifies how video and audio have been mixed and tells playback devices the best way to play the files.

Video and audio codec formats seek advice from the applied sciences used to both create and play back the digital video and audio.

Examples of file types are MPEG-4 (MP4), Quicktime (MOV), and Flash Video (FLV). The key variable in most cases is the streaming platform you use. Always check what formats and codecs are supported by the platform you want to use, and whether your video file should be converted to a supported format.

DaCast, for example, requires an MPEG-4 (MP4) file format with an H.264 video codec. Windows Media Video (WMV) files are Advanced Systems Format (.asf) files that embrace audio, video, or each compressed with Windows Media Audio (WMA) and Windows Media Video (WMV) codecs.

MP4 video provides higher quality and compression over WMV, allowing you to store better quality video for the same file size. An excellent video transcoding program might be able to transform a number of file formats and codecs.

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