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 expected 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 progress will continue.
In case you’re involved with streaming media, you either know all about video transcoding, or you’re wondering why you keep hearing about it. If you happen to aren’t certain you want it, that places you in the second camp. An understanding of video transcoding and how one can do it is critical for any success with streaming video; particularly if it’s essential to deliver streaming video to a wide range of different devices.
What’s Video Transcoding?
Video transcoding, generally called video encoding, is the conversion from one digital encoding format to a different, such as for film data files. This entails translating all three components of a digital video on the similar time — the file format, the video, and the audio.
This is a vital function when a target gadget does not assist the present format of your media, or has limited storage capacity that requires a reduced file dimension (think going from WMV to MP4). It’s also used to transform incompatible or out of date data to a better-supported, read newer, video format.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 material to reach more finish users.
For instance, you’re making 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 will likely be delivered live to on-line viewers; nevertheless, an attempt to stream it directly can have problems:
These viewing without ample 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 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’ll be able to create a set of time-aligned video streams, every with a special bitrate and frame dimension, while changing the Speex audio to AAC audio. This group of streams is internet-pleasant, allowing you attain virtually any screen on the planet.
How is Video Transcoding Accomplished?
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 online or play it from another device. Video transcoding is used to alter the original format into one allowing the video and audio to play properly on a user’s devices — 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 target format.
What are Codecs and File Types in Video Transcoding?
When talking about video transcoding, we confer with file formats, file types, and something called codecs.
Video format specifies how video and audio have been combined and tells playback units easy methods to play the files.
Video and audio codec formats check with the applied sciences 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 want to use, and whether your video file must be converted 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 embrace audio, video, or both 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 higher quality video for the same file size. A great video transcoding program will probably be able to convert a number of file codecs and codecs.
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