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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 have been to be consumed on mobile platforms. It was anticipated to rise to 9.6 exabytes in 2017 and bounce to 15.2 exabytes in 2018. Without knowing the precise numbers, it is safe to say the demand and growth will continue.
In case you’re concerned with streaming media, you either know all about video transcoding, or you’re wondering why you keep hearing about it. In the event you aren’t certain you want it, that places you in the second camp. An understanding of video transcoding and the way to do it is critical for any success with streaming video; particularly if it's worthwhile to deliver streaming video to a variety of completely different devices.
What is Video Transcoding?
Video transcoding, sometimes called video encoding, is the conversion from one digital encoding format to another, corresponding to for movie data files. This entails translating all three parts of a digital video at the identical time — the file format, the video, and the audio.
This is a vital function when a goal machine does not assist the present format of your media, or has limited storage capacity that requires a reduced file size (think going from WMV to MP4). It is usually used to convert incompatible or obsolete data to a better-supported, read newer, video format.
Why is Transcoding Critical?
Video transcoding is critical while you want your content to reach more finish users.
For instance, you’re getting ready to do a live stream out of your office. It’s a possibility that you’re capturing webcam audio and video with a browser-based mostly desktop application like Adobe Flash, which generates 1080p H.264 video and Speex audio.
Your show will be delivered live to online viewers; however, an try and stream it directly may have problems:
These viewing without sufficient bandwidth won’t be able to view the stream — they’ll be watching the ‘buffering’ circle.
As a way to render the Speex audio, most individuals will need to watch utilizing Flash Player on a computer. Now you’ve just excluded nearly anybody with slower data speeds, tablets, and mobile phones.
With video transcoding, you may create a set of time-aligned video streams, every with a unique bitrate and frame measurement, while changing the Speex audio to AAC audio. This group of streams is internet-friendly, permitting you reach virtually any screen on the planet.
How is Video Transcoding Achieved?
Video begins life in a format distinctive to the camera or program used to seize your images and sounds. This is typically not the format wanted to deliver the video on-line or play it from another device. Video transcoding is used to alter the original 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, includes a two-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 discuss with file codecs, file types, and something called codecs.
Video format specifies how video and audio have been combined and tells playback devices how to play the files.
Video and audio codec codecs discuss with the technologies 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 wish to use, and whether your video file have to be converted to a supported format.
DaCast, for instance, 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 better quality and compression over WMV, permitting you to store better quality video for the same file size. A good video transcoding program will be able to transform multiple file formats and codecs.
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