Random Thoughts – Randocity!

App-casting vs Screen Casting vs Streaming

Posted in Android, Apple, computers by commorancy on October 8, 2016

A lot of people seem to be confused by these three types of broadcasting software, including using AppleTV and Chromecast for this. I’m here to help clear that up. Let’s explore.

Streaming and Buffering

What exactly is streaming? Streaming is when software takes content (music file, movie file, etc) and sends it out in small chunks from the beginning to the end of the file over a network. While streaming, there is a placeholder point in time entry point to begin watching. In other words, when you join a streaming feed, you’re watching that feed live. If you join 20 minutes in, you’ll miss the first 20 minutes that has already played. The placeholder point is the point in time that’s currently being played from the media.

What about broadcasting? Is it the same? Yes, it is a form of streaming that is used during app-casting and screen casting. So, if you join a live screen casting feed, you won’t get to see what has been in the past, you only get to see the point forward from when you joined the stream already in progress.

Streaming also uses buffering to support its actions. That means that during the streaming process, the application buffers up a bunch of content into memory (the fastest type of storage possible) so that it can grab the next chunk rapidly and send it to the streaming service for smooth continuous playback. Buffering is used to avoid access to slow devices like hard drives and other storage devices which may impair smooth playback. Because of buffering, there may be a delay in what your screen shows versus what the person watching sees.

Streaming encodes the content to a streaming format at broadcast time. It is also decoded by the client at the during streaming. Therefore, the endpoint client viewer may choose to reduce the resolution of the content to improve streaming performance. For this reason, this is why if you’re watching Netflix or Amazon, the resolution may drop to less than HD. However, if you’re watching content across a local network at home, this should never be a problem (unless your network or WiFi is just really crappy).

Note, I will use the word stream and cast interchangeably to mean the same thing within this article.

Screen Casting (i.e., Screen Mirroring)

Screen casting is broadcasting the screen of your device itself. For example, if you want to broadcast the screen of your MacBook or your Android tablet, it will broadcast at whatever resolution your screen is currently running. If your resolution is 1920×1080, then it will stream your screen at HD resolution. If your screen’s resolution is less than this, it will stream the content at less than HD. If your screen resolution is more than this, it will stream at that resolution. Though, with some streaming software, you can set a top end resolution and encoder to prevent sending out too much data.

Because screen casting or mirroring only casts in the resolution of your screen, this is not optimal for streaming movies (unless your movie is 1080p and matches your screen’s resolution). If your screen runs at a lower resolution than the content, it is not optimal for watching moves. If you want to watch UltraHD movies, this is also not possible in most cases (unless your PC has an extremely advanced graphics card).

For many mobile devices and because screen resolutions vary, it’s likely your screen resolution is far less than the content you want to watch. For this reason, app developers have created App-casting.


What exactly is app-casting? App-casting distances itself from the screen resolution by streaming the content at the content’s resolution. App-casting is when you use AppleTV or Chromecast to stream content from an app-cast enabled application on your computer or mobile device. Because the content dictates the resolution, there are no pesky screen resolution problems to get in the way. This means content streamed through applications can present their content at full native resolutions.

For Netflix, ABC TV, NBC TV, Hulu and Amazon, this means you’ll be watching those movies and TV shows in glorious full 1080p resolution (or whatever the app-casting receiver supports and also based on the content). For example today, AppleTV and Chromecast only support up to HD resolution (i.e., 1080p). In the future, we may see UltraHD versions of AppleTV and Chromecast become available. However, for now, we’re limited to HD with these devices.

Though, once an UltraHD version of AppleTV and Chromecast arrive, it also means that streaming to these devices means heftier bandwidth requirements. So, your home network might be fine for 1080p content casting, UltraHD content streaming may not run quite as well without better bandwidth. To stream UltraHD 4k content, you may have to upgrade your wireless network.

Note that Google has recently announced an UltraHD 4k Chromecast will be available in November 2016.

Chromecast and AppleTV

These are the two leading app-streaming devices on the market. AppleTV supports iOS app streaming and Chromecast supports Android OS streaming. While these are commonly used and sold for this purpose, they are by no means the only software or hardware solutions on the market.

For example, DLNA / UPnP is common for streaming to TVs, Xbox One and PS4. This type of streaming can be found in apps available on both iOS and Android (as well as MacOS, Linux and Windows). When streaming content from a DLNA compatible app, you don’t need to have a special receiver like AppleTV or Chromecast. Many smart TVs today support DLNA streaming right out of the box. To use DLNA, your media device needs to present a list of items available. After selection, DLNA will begin streaming to your TV or other device that supports DLNA. For example, Vizio TVs offer a Multimedia app from the Via menu to start DLNA search for media servers.

Note that you do not have to buy an AppleTV or Chromecast to stream your tablet, desktop or other device. There are free and paid DLNA, Twitch and YouTube streaming apps. You can stream both your display and possibly even your apps using third party apps. You’ll need to search for DLNA streaming app in whichever app store is associated with your device.

DLNA stands for Digital Living Network Alliance. It is an organization that advocates for content streaming around the home.

App-casting compatibility

To cast from an application on any specific operating system to devices like Chromecast or AppleTV, the app must support this remote display protocol. Not all apps support it, though Apple and Google built apps do. Third party applications must build their software to support these external displays. If the app doesn’t support it, you won’t see the necessary icon to begin streaming.

For example, to stream on iOS, a specific icon appears to let you know that an Apple TV is available. For Android, a similar icon also appears if a Chromecast is available. If you don’t see the streaming icon on your application, it means that your application does not support streaming to a remote display. You will need to ask the developer of that software to support it.

There are also third party casting apps that support streaming video data to remote displays or remote services like Twitch or YouTube. You don’t necessarily need to buy an AppleTV or Chromecast to stream your display.

Third Party Streaming Apps

For computers or mobile devices, there are a number of streaming apps available. Some require special setups, some support Twitch or YouTube and others support DLNA / UPnP. If you’re looking to stream content to the Internet, then you’ll want to pick one up that supports Twitch or YouTube. If you’re wanting to stream your data just to your local network, you’ll want to find one that supports DLNA.

You’ll just need to search through the appropriate app store to find the software you need. Just search for DLNA streaming and you’ll find a number apps that support this protocol. Note that apps that don’t require the use of Chromecast or AppleTV may tend to be less robust at streaming. This means they may crash or otherwise not work as expected. Using AppleTV or Chromecast may be your best alternative if you need to rely on having perfect streaming for a project or presentation.

Basically, for stability and usability, I recommend using an AppleTV or Chromecast. But, there are other software products that may work.




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