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Transcoding and Why Is It Critical for Streaming
Streaming media is booming and everyone seems to be 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 anticipated to rise to 9.6 exabytes in 2017 and bounce to 15.2 exabytes in 2018. Without knowing the exact numbers, it is safe to say the demand and growth will continue.
If you’re involved with streaming media, you either know all about video transcoding, or you’re wondering why you keep hearing about it. Should you aren’t positive you need it, that places you within the second camp. An understanding of video transcoding and how to do it is critical for any success with streaming video; particularly if you want to deliver streaming video to a wide range of totally 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 film data files. This involves translating all three components of a digital video on the similar time — the file format, the video, and the audio.
This is a vital operate when a goal device doesn't assist the current format of your media, or has limited storage capacity that requires a reduced file size (think going from WMV to MP4). Additionally it is used to convert incompatible or out of date data to a greater-supported, read newer, video format.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 when you need your content to succeed in more finish users.
For instance, you’re getting ready to do a live stream from your office. It’s a possibility that you’re capturing webcam audio and video with a browser-primarily based deskprime application like Adobe Flash, which generates 1080p H.264 video and Speex audio.
Your show can be delivered live to online viewers; nevertheless, an attempt to stream it directly can have problems:
These viewing without enough bandwidth won’t be able to view the stream — they’ll be watching the ‘buffering’ circle.
So as to render the Speex audio, most people might want to watch utilizing Flash Player on a computer. Now you’ve just excluded almost anyone with slower data speeds, tablets, and mobile phones.
With video transcoding, you can create a set of time-aligned video streams, each with a distinct bitrate and frame size, while changing the Speex audio to AAC audio. This group of streams is internet-friendly, allowing you reach virtually any screen on the planet.
How is Video Transcoding Carried out?
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 needed to deliver the video on-line or play it from one other device. Video transcoding is used to alter the original format into one permitting the video and audio to play properly on a person’s gadgets — be they computer, tablet, smartphone, or tv.
Video encoding, or video transcoding, includes a two-step process. First, the unique 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 codecs, file types, and something called codecs.
Video format specifies how video and audio have been mixed and tells playback units find out how to play the files.
Video and audio codec codecs discuss with the applied sciences used to both 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 want to use, and whether or not your video file must be transformed to a supported format.
DaCast, for example, 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 include 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 very good video transcoding program can be able to transform multiple file codecs and codecs.
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