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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 were to be consumed on mobile platforms. It was anticipated to rise to 9.6 exabytes in 2017 and leap to 15.2 exabytes in 2018. Without knowing the exact numbers, it is safe to say the demand and progress 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 positive you want it, that places you in the second camp. An understanding of video transcoding and how you can do it is critical for any success with streaming video; especially if you need to deliver streaming video to a variety of totally different devices.
What's Video Transcoding?
Video transcoding, generally called video encoding, is the conversion from one digital encoding format to a different, akin to 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 target system doesn't help the current 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 It is usually used to convert incompatible or out of date data to a better-supported, read newer, video format.
Why is Transcoding Critical?
Video transcoding is critical once you want your content to achieve more finish users.
For example, you’re preparing 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 deskprime application like Adobe Flash, which generates 1080p H.264 video and Speex audio.
Your show will be delivered live to online viewers; nonetheless, an try to stream it directly will have problems:
These viewing without adequate bandwidth won’t be able to view the stream — they’ll be watching the ‘buffering’ circle.
With a purpose to render the Speex audio, most people will need to watch using Flash Player on a computer. Now you’ve just excluded almost anybody with slower data speeds, tablets, and mobile phones.
With video transcoding, you may create a set of time-aligned video streams, each with a different 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 unique to the camera or program used to seize your images and sounds. This is typically not the format wanted to deliver the video online or play it from one other device. Video transcoding is used to change the unique format into one allowing the video and audio to play properly on a user’s gadgets — be they laptop, tablet, smartphone, or tv.
Video encoding, or video transcoding, entails a two-step process. First, the original file is decoded to an uncompressed format. Second, this uncompressed format is then encoded into the target format.
What are Formats and File Types in Video Transcoding?
When talking about video transcoding, we consult with file formats, file types, and something called codecs.
Video format specifies how video and audio have been mixed and tells playback devices easy methods to play the files.
Video and audio codec codecs refer to the technologies used to each create and play back the digital video and audio.
Examples of file types are MPEG-four (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 should be converted to a supported format.
DaCast, for instance, requires an MPEG-four (MP4) file format with an H.264 video codec. Windows Media Video (WMV) files are Advanced Systems Format (.asf) files that embody audio, video, or both 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 higher quality video for a similar file size. A superb video transcoding program will be able to transform multiple file formats and codecs.
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