What exactly is progressive download? How is video live-streaming live over the internet? All these questions and more are answered in this article.
Corporate websites are now embedding helpful ‘how to’ and ‘introductory’ video files in their website pages, and are becoming increasingly aware that their particular visitors are far more likely to watch a 3 minute video than to go through pages of text.
With video streaming over the internet now being taken for granted, we have to ask; How does it work?
Firstly, we have to break video streaming down into its 3 most commonly utilized forms.
1) On demand movie streaming
2) Progressive download
3) Live video streaming
On need video streaming This is where a video content material is streamed over the internet when a site visitor demands it. An example of this is how you click a play key for a video you want to watch and the video plays. This is very similar to the ‘Progressive download’ that we have mentioned except for one main difference. When a video is usually streamed it is using streaming server technology. Steaming servers are a great way to make sure the video is delivered as it must be. Streaming video with the various loading server technologies also allows us to do more than just stream our video. We can actually have ‘user interaction’ with our streaming server allowing us to take a video watcher to a shop to buy something they have seen and ‘clicked on’ in the video they are watching one example is.
Progressive download: This is where your video player downloads the whole video into your computers memory while the video is definitely playing.
Live video streaming: Live video streaming requires a capture gadget, like a video camera, encoding software that transcodes or converts the video sign from the camera into a web compliant video clip format and a streaming server.
The video camera will pass on the video information to the encoder, which will send the particular transcoded video up to the streaming server (usually over the internet) using Among the various streaming protocols. The loading server will then broadcast the encoded video over the internet to your viewers who will see your video live, generally using a short delay, commonly about seven to 20 seconds of what is going on in real time.
What is MPEG4? MPEG4 has been designed to allow video playpack on a wide variety of platforms. It can be used on computer systems, HD TV, PDA’s and mobile phones.
Although there are many different video forms on the internet, the basis for all streaming, regardless of whether live, on demand or modern download, all work using comparable coding schemes derived from work done for MPEG2, the prior format to MPEG4.
MPEG4 is made up of ‘data channels’ utilized to send the video stream and the audio stream. The number of data channels is not explicit. Generally we have a video transportation channel that is used to stream the video data, we have up to 8 stations for audio, usually MP3 or AAC (Advance Audio Codec), we now have a channel for subtitles and we have a data channel that allows information to be passed to and from the streaming server.
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Video, especially in films, is delivered frame by frame. This is carried over from traditional recording methods where each frame provides the full picture presented to the viewers. These frames are played back again one after the other so quickly that, to the human eye, creates the result of continuous movement.
Compressed MPEG4 video is made up of ‘I-Frames’ and ‘P-Frames. I-Frames are effectively frames that contain all the information needed to display a body, where a P-Frame is an update of an I-Frame. So what the decoder will is show an I-frame and then show a series of P-Frames that up-date changes in movement etc . For this reason, the video size is massively reduced. This explains why, when watching a video over the internet you sometimes see empty squares in the picture. This is because the P-Frames were not received in time as well as the decoder cannot update those places in the video.
What is a Codec A Codec is a way of coding plus decoding information. So all the numerous video formats on the internet work in a similar way, using an encoder to reduce video clip and audio data whilst protecting as much quality as possible. This video clip is then transmitted over the internet so when it reaches the clients participant it gets decoded into, or even as near to, its original format.