许多人购买Roku电视设备，仅将其用作使用随附的Roku遥控器在设备上流式传输内容的一种方式。许多人没有意识到，您还可以从 PC 或移动设备投射到Roku TV。(Roku)
当此功能已嵌入Roku TV 流媒体设备(Roku TV streaming device)时，为什么还要购买其他投射设备（如 Chromecast） ？
在本文中，我们将向您展示准备Roku TV 需要做的事情，以及如何投射到Roku TV 上。此功能适用于台式电脑、笔记本电脑、平板电脑或智能手机。
准备您的 Roku 电视进行投射
如果您将Roku电视连接到电视，则可以立即开始投射。但是，您可以采取一些措施来确保您可以从更多网站和服务进行投射。
- 确保(Make)您的Roku电视已连接到您的家庭Wi-Fi网络。
- 使用Roku电视菜单将您通常从中投射的服务添加为新的Roku频道。(Roku)
- 确保(Make)您的 PC 或移动设备连接到同一个家庭Wi-Fi网络。
对于支持Roku(Roku) TV 投射的许多服务来说，添加频道并不重要，但它可以在您的手机上启用其他应用程序，这些应用程序通常在没有添加频道的情况下无法运行。
如何从您的计算机投射到(Computer)Roku电视
如果您想从计算机投射到Roku电视，您有几个选择。
投射到Roku电视的工作方式几乎与投射到 Chromecast 的(cast to a Chromecast)方式相同。您将使用相同的投射图标，但从投射列表中选择不同的设备。
这并不像Chromecast那样在任何地方自动运行。例如，如果您使用Chrome浏览器并从菜单中选择Cast，您会看到Roku TV 已列出但未启用。
这是因为并非每个视频流媒体网站都支持(video streaming site)Roku TV。在大多数情况下，如果您坚持在Roku TV 上有频道的服务，您也可以从其网站进行投射。
例如，如果您使用 YouTube TV 或Youtube并选择视频上显示的投射图标，您会看到Roku TV已列出并作为可投射到的可用设备处于活动状态。
只需选择您要投射到 的Roku TV设备，视频就会开始显示在那里。(Roku TV)
如何将您的计算机显示(Computer Display)镜像到Roku电视
您拥有的另一个选择是将您的计算机显示镜像到您的Roku电视设备。这是由Windows计算机和Roku TV支持的Miracast 协议实现的。(Miracast protocol)
注意(Note)：这仅适用于Windows计算机，不适用于Mac或Linux。
为此，请选择 Windows 10 计算机右下角的通知图标。
从图标列表中选择项目。(Project)在项目方向列表中，选择底部的 连接到无线显示器。(Connect to a wireless display)
Roku TV设备本质上是将其连接的电视转换为支持Miracast的无线显示器(connected to into a wireless display)。
从选项列表中选择 Roku TV设备。(Roku TV)
您的电视现在将显示您计算机的显示屏。这是向房间内但看不到您的计算机显示屏的其他人提供演示或演示的好方法。
如何从您的移动(Mobile)设备投射到Roku电视
您还可以从智能手机或平板电脑投射到您的Roku电视设备。它实际上在您的手机上效果更好。
在支持流式传输到Roku TV(Roku TV)的视频流媒体网站或应用程序上，只要您点击投射图标，您就会看到可用投射设备列表中列出的Roku TV设备。
但是，在不支持流式传输到Roku TV 的任何应用程序、服务或网站上，您会注意到您的Roku TV 流式传输设备未列出。
这并不意味着你不走运。例如，当您尝试从Spotify应用投射时，您会注意到Roku TV未包含在流媒体设备列表中。
但是，如果您安装了Roku 应用程序(Roku app)，您可以添加Spotify 频道(Spotify channel)并且可以进行投射。为此，请选择主页底部的频道图标。(Channels)选择Channel Store并浏览Music & Podcasts。选择Spotify 旁边的添加。(Add)
启动Spotify应用程序后，您的Spotify帐户将显示在Roku TV 上，您可以使用移动遥控器选择、播放和控制您的音乐。
您还可以使用该应用程序将媒体从移动设备投射到Roku TV，包括音乐、照片和视频。
但是不支持Roku TV 投射的视频网站呢？与您的台式机不同，您实际上有一种解决方法，可以将这些视频从您的移动设备投射到您的Roku电视上。(Roku)我们将在下面介绍该解决方法。
如何将不受支持的视频投射(Cast Unsupported Videos)到Roku TV
如果您想从任何网站或移动设备的流媒体服务投射视频，有一个名为Web Video Cast的应用程序可以让您做到这一点。
Web Video Cast 可用于Android 手机和平板电脑(Android phones and tablets)以及Apple 设备(Apple devices)。
这是它的工作原理。安装后，您可以打开应用程序并使用内置浏览器访问托管您要播放的视频的视频站点。
当您点击视频将其打开时，Web Video Cast会询问您要将视频流投射到哪里。选择Connect cast 图标以选择您的设备。
第一次执行此操作时，您可能看不到您的Roku电视设备。(Roku)要添加它，只需点击列表右上角的齿轮图标，您就会看到支持的设备列表。向下滚动(Scroll)到Roku设备，选中右侧的复选框，然后选择完成(Done)。
现在，您将在可以投射到的设备列表中看到可用的Roku设备。(Roku)如果这不起作用，您可能需要使用路由器查找您的 Roku IP 地址(look up your Roku IP address)。
当您选择Roku设备时，Web Video Cast会将其流式传输到您的Roku电视。即使底层视频服务不支持投射到Roku ，这也有效！
How to Cast to Roku TV from PC or Mobile
Many people buy a Roku TV device and only υse it as a way to stream content on the device using the included Roku remote. What many people don’t realize is that yоu can also cast to Rokυ TV from a PC or mobile device.
Why buy another casting device like a Chromecast when this feature is already embedded with the Roku TV streaming device?
In this article, we’ll show you what you need to do to prepare your Roku TV and how to cast to Roku TV whatever you like. This feature works from a desktop PC, a laptop, a tablet, or a smartphone.
Prepare Your Roku TV for Casting
If you have a Roku TV connected to your TV, you’re ready to start casting right away. However there are a few things you can do to ensure that you can cast from more websites and services.
- Make sure your Roku TV is connected to your home Wi-Fi network.
- Add the services you usually cast from as new Roku channels using the Roku TV menu.
- Make sure your PC or mobile device is connected to the same home Wi-Fi network.
Adding channels isn’t critical for many of the services that support Roku TV casting, but it can enable additional apps on your phone that normally wouldn’t work without the channel added.
How to Cast to Roku TV From Your Computer
You have a few options if you want to cast to your Roku TV from your computer.
Casting to your Roku TV works almost identically to how you’d cast to a Chromecast. You’ll use the same casting icon, but choose a different device from the cast list.
This doesn’t work everywhere automatically as it does with Chromecast. For example if you are using a Chrome browser and select Cast from the menu, you’ll see that Roku TV is listed but not enabled.
This is because Roku TV isn’t supported by every single video streaming site out there. For the most part, if you stick to the services that have channels on Roku TV, you’ll be able to cast from its website as well.
For example if you use YouTube TV or Youtube and select the cast icon displayed on the video, you’ll see Roku TV listed and active as an available device to cast to.
Just select the Roku TV device you want to cast to and the video will start displaying there.
How to Mirror Your Computer Display to Roku TV
Another option you have is to mirror your computer display to your Roku TV device. This is made possible by the Miracast protocol supported by both Windows computers and Roku TV.
Note: This only works on Windows computers, not Mac or Linux.
To do this, select the notifications icon at the lower right corner of your Windows 10 computer.
Choose Project from the list of icons. On the list of project orientations, select Connect to a wireless display at the bottom.
The Roku TV device essentially converts the television it’s connected to into a wireless display that supports Miracast.
Select the Roku TV device from the list of options.
Your TV will now show your computer’s display. This is a great way to provide demonstrations or give presentations to others who are in the room but can’t see your computer display.
How to Cast to Roku TV from Your Mobile Device
You can also cast to your Roku TV device from your smartphone or tablet. It actually works even better from your mobile.
On video streaming sites or apps that support streaming to Roku TV, whenever you tap the cast icon you’ll see the Roku TV device listed in the list of available casting devices.
However, on any apps, services, or websites that don’t support streaming to Roku TV, you’ll notice that your Roku TV streaming device isn’t listed.
That doesn’t mean you’re out of luck. For example, when you try to cast from your Spotify app, you’ll notice that Roku TV isn’t included in the list of streaming devices.
However, if you install the Roku app, you can add the Spotify channel and casting will work. To do this, select the Channels icon at the bottom of the main page. Select Channel Store and browse Music & Podcasts. Select Add next to Spotify.
Once you launch the Spotify app, your Spotify account will display on Roku TV and you can use the mobile remote to select, play, and control your music.
You can also use the app to cast media from your mobile device to Roku TV, including music, photos, and videos.
But what about video sites that don’t support Roku TV casting? Unlike on your desktop, you actually have a workaround to still cast those videos to your Roku TV from your mobile device. We’ll cover that workaround below.
How to Cast Unsupported Videos to Roku TV
If you want to cast videos from any website or streaming service from your mobile device, there’s an app called Web Video Cast that’ll let you do just that.
Web Video Cast is available for Android phones and tablets as well as Apple devices.
Here’s how it works. Once installed, you can open the app and use the built-in browser to visit the video site that hosts the video you want to play.
When you tap the video to open it, Web Video Cast will ask where you’d like to cast the video stream. Select the Connect cast icon to choose your device.
You may not see your Roku TV device included the first time you do this. To add it, just tap the gear icon at the upper right corner of the list and you’ll see a list of supported devices. Scroll down to the Roku device, select the checkbox on the right, and then select Done.
Now you’ll see available Roku devices in your list of devices you can cast to. If this doesn’t work, you may need to look up your Roku IP address using your router.
When you select the Roku device, Web Video Cast will stream it to your Roku TV. This works even if the underlying video service doesn’t support casting to Roku!
