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 bounce to 15.2 exabytes in 2018. Without knowing the exact numbers, it is safe to say the demand and growth will continue.
Should you’re involved with streaming media, you either know all about video transcoding, or you’re wondering why you keep hearing about it. In case you aren’t sure 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 it’s essential to deliver streaming video to quite a lot of totally different devices.
What’s Video Transcoding?
Video transcoding, generally called video encoding, is the conversion from one digital encoding format to another, corresponding to for film data files. This involves translating all three parts of a digital video at the same time — the file format, the video, and the audio.
This is a vital operate when a goal machine doesn’t assist the current format of your media, or has limited storage capacity that requires a reduced file measurement (think going from WMV to MP4). Additionally it is used to transform incompatible or out of date data to a greater-supported, read newer, video format.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 to succeed in more finish users.
For example, you’re preparing to do a live stream out of your office. It’s a possibility that you just’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 on-line viewers; nonetheless, an try to stream it directly could have problems:
Those viewing without enough bandwidth won’t be able to view the stream — they’ll be watching the ‘buffering’ circle.
In an effort to render the Speex audio, most people might want to watch utilizing Flash Player on a computer. Now you’ve just excluded nearly anyone with slower data speeds, tablets, and mobile phones.
With video transcoding, you possibly can create a set of time-aligned video streams, each with a distinct bitrate and frame dimension, while converting 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 Executed?
Video begins life in a format unique to the camera or program used to capture your images and sounds. This is typically not the format needed to deliver the video online or play it from one other device. Video transcoding is used to vary the original format into one permitting the video and audio to play properly on a user’s units — be they laptop, tablet, smartphone, or tv.
Video encoding, or video transcoding, entails a two-step process. First, the unique 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 seek advice from file formats, file types, and something called codecs.
Video format specifies how video and audio have been combined and tells playback gadgets methods to play the files.
Video and audio codec codecs check with the technologies used to each 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 codecs and codecs are supported by the platform you wish to use, and whether or not your video file have to 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 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, permitting you to store higher quality video for the same file size. A superb video transcoding program might be able to convert multiple file formats and codecs.
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