Streaming is a
technology used to deliver content to computers and mobile devices over the
internet. Streaming transmits data – usually audio and video, but increasingly
other kinds as well – as a continuous flow, which allows the recipients to
begin to watch or listen almost immediately.
The Two Kinds of Downloads
There are two
ways to download content over the internet:
1.
Progressive downloads
2.
Streaming
Streaming is the
quickest way to access internet-based content, but it's not the only way.
Progressive download is another option that was used for years before streaming
was possible. In order to understand what streaming is, where you use it, and
why it's so helpful, you need to understand these two options.
The key
differences between progressive download and streaming are when you can start
using the content and what happens to the content after you're done with it.
Progressive
downloads are the traditional kind of download that anyone who's used the
internet is familiar with. When you download an app or game or buy music from
the iTunes Store, you need to download the entire thing before you can use it.
That's a progressive download.
Streaming is different.
Streaming allows you to start using the content before the entire file is
downloaded. Take music: When you stream a song from Apple Music or Spotify, you
can click play and start listening almost immediately.
You don't have
to wait for the song to download before the music starts. This is one of the
major advantages of streaming. It delivers data to you as you need it.
The other major
difference between streaming and downloads is what happens to the data after
you use it. For downloads, the data is permanently stored on your device until
you delete it.
For streams, the
data is automatically deleted after you use it. A song you stream from Spotify
isn't saved to your computer (unless you save it for offline listening, which
is a download).
Requirements for Streaming Content
Streaming
requires a relatively fast internet connection – just how fast depends on the
type of media you are streaming. A speed of 2 megabits per second or more is
necessary for streaming standard definition video without skips or buffering
delays. HD and 4K content requires higher speeds for flawless delivery: at
least 5Mbps for HD content and 9Mbps for 4K content.
Live Streaming
Live streaming
is the same as the streaming discussed above, it's specifically used for
internet content delivered in real time as it happens. Live streaming is
popular with live television shows and special one-time events.
Streaming Games and Apps
Streaming has
traditionally been used to deliver audio and video, but Apple has recently
implemented technology that allows streaming to work with games and apps too.
This technique,
called on-demand resources, allows games and apps to include a core set of
features and functions when the user first downloads them and then to stream
new content as the user needs it.
For example, a
game might include its first four levels in the initial download and then
automatically download levels five and six when you start playing level four.
This approach is
useful because it means downloads are quicker and use less data, which is
especially important if you have a data limit on your phone plan. It also means
that apps take up less space on the device they're installed on.
Problems With Streaming
Because
streaming delivers data as you need it, slow or interrupted internet
connections can cause problems. For example, if you have streamed only the
first 30 seconds of a song and your internet connection drops bfore any more of
the song has streamed to your device, the song stops playing.
The most common
streaming error that crops up has to do with buffering. The buffer is a
program's temporary memory for streamed content. The buffer is always filling
up with the content you need next. For example, if you watch a movie, the
buffer stores the next few minutes of video while you're watching the current
content. If your internet connection is slow, the buffer won't fill up quickly
enough, and the stream either stops or the quality of the audio or video is
reduced to compensate.
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