Engineering Windows 7

Welcome to our blog dedicated to the engineering of Microsoft Windows 7

Media Streaming with Windows 7

Media Streaming with Windows 7

We’ve blogged about a number of features related to home networking and media in Windows 7.  A scenario which brings all these together in a pretty cool way is Media Streaming.  This scenario allows you to use a Windows 7 PC as a hub for media sharing—where you can share media with other PCs and devices on your home network via streaming, and even stream this information securely over the internet.  Scott Manchester on the Devices & Media program management team coordinated this post, but as you will see it represents work across the Core User Experience, Media Center, Networking, and even Windows Live chose to take advantage of the new APIs in this scenario.  This is a pretty detailed post and there’s a lot to try out.  Those of you using the RC to test things out, you can always install on another PC and use it for the 30-day period without requiring a new PID key.  Have fun!  --Steven

Windows 7 includes a number of exciting new media streaming features that enable you to enjoy your media collection on other PCs and devices in the home and while on the road from across the internet. We’ve created a networked media experience that is more friendly to use and simpler to set up. Now enjoying music, pictures, and video on your network connected PC or media device “just works” without concern for media formats, transports, or protocols.

There are a growing number of Network Media Devices (NMDs) certified to interoperate using an open and widely embraced industry standard called the Digital Living Network Alliance (DLNA). Windows 7 implements this open standard, which means that sharing media between NMDs, Windows PCs, Windows Home Server, and Extenders for Windows Media Center (including Xbox 360) is easier and more natural. Supporting this standard also means that the myriad of NMDs such as electronic picture frames, network radios, televisions, and others are companions to Windows 7 PCs and may seamlessly participate in the whole-home media experience.

Not Just for the Techie

We made it much simpler to configure media streaming. Before Windows 7, media streaming features were focused on media enthusiasts. To improve the setup experience, media streaming has been integrated with the new HomeGroup feature so in a typical home network configuration, media streaming is enabled and works by default. There is also a new “Stream” menu prominently displayed in the Window Media Player user interface (see figure below) that exposes simple scenario-based configuration options. These options allow you to:

  1. Set up your home PC so you can access your media libraries while away from home
  2. Allow other Windows 7 PCs and devices to push media to your Player and control it
  3. Quickly authorize all home PCs and devices to access your media collection

Each of these scenarios will be discussed throughout this post.

Configuring the stream options in Windows Media Player

HomeGroup introduces the concept of “shared libraries” for music, pictures, and video. As described in a previous blog post, these shared libraries are accessible from within the navigation pane of Windows Explorer and Windows Media Player, and from the “shared” view of each media category within Windows Media Center (see figures below). The scope of these libraries is the same from each of these views.

Libraries shared between Media Player and Media Center

Media Center

Windows Explorer will automatically discover and provide access to shared media libraries on other HomeGroup PCs. In addition, Windows Media Player and Windows Media Center will automatically discover shared libraries from:

  1. Windows Media Player 11 and 12
  2. Windows Home Server
  3. All DLNA compliant media servers (e.g. network attached storage)

Who Can Access My Shared Media Libraries?

A HomeGroup is a secured set of Windows 7 PCs that can view and consume each other’s media seamlessly. Sharing is automatically set up among HomeGroup PCs and HomeGroup settings allow you to choose what types of media you would like to share; for example, you may choose to only share your music library and not your video or pictures.

Changing homegroup settings

In addition to all HomeGroup PCs being able to access your media, we made it easy to allow devices to access shared media libraries on Windows 7 PCs. This can be done conveniently from either HomeGroup settings or within Windows Media Player:

Enable streaming.

Allowing devices to share media from Media Player

You can also choose to restrict which specific PCs or devices have access to your media by choosing “more streaming options…” from the Windows Media Player “Stream” menu.

Restricting sharing to specific devices.

Play To: Windows 7 as a Universal Remote Control for your Media Collection

In addition to playing media streamed from other shared media libraries within Windows Media Player, Windows 7 can now send media to be played on other Windows 7 PCs and DLNA-certified digital media renderers. We call this feature “Play To.” With “Play To,” you can browse or search from within Windows Media Player or Windows Explorer to find your desired media, and then choose where you want it to be played. A versatile remote control window is presented for each “Play To” session, providing you with the ability to control the entire experience.

Choosing the Play To device in Media Player

Choosing the Play To device from Explorer

It does not matter where media collections are stored. “Play To” is available for both local media libraries and for shared media libraries. If you would like to send media from one Windows 7 PC to another, choose “Allow remote control of my Player” from the Windows Media Player “Stream” menu on the receiving PC. This will cause Windows Media Player to be discovered in the “Play To” menu of other Windows 7 PCs on the same network.

Allowing remove control of the player

When media streaming is enabled on your Windows 7 PC, “Play To” will be available in Windows Media Player and Windows Explorer via the right click menu for media items. If Windows 7 has not discovered a “Play To” capable PC or device on the network, this context menu will not be available. DLNA provides guidelines to certify different device categories and roles. Not every DLNA-certified device supports the “Play To” feature. Look for DLNA-certified Digital Media Renderers (DMR), and for the best performance, look for DMR devices that carry the “Compatible with Windows 7” logo.

Compatible with Windows 7 logo

Once you’ve selected media items to play on another PC or device, a “Play To” remote control window will launch providing standard controls like play, pause, stop, skip forward and backward, seek forward and backward, volume, and mute. Not every device will support all of the control features and some media types may not support seek. Once the “Play To” remote control window is launched, you can reorder or delete items, add to the queue, or toggle repeat. It’s even possible to add new media items from Windows Media Player or Windows Explorer by dragging them into this window.

Play To remote control window.

There is no artificial limit to the number of “Play To” sessions you can launch. You may send pictures to a picture frame, video clips to a TV, and music to another Windows 7 laptop all at the same time. Furthermore, different types of media can be sent to a single destination, as shown in the example above.

What About the Xbox 360 and Extenders for Windows Media Center?

Xbox 360 has two ways to receive media streams from other Windows 7 PCs, which we refer to casually as “dashboard” mode and “extender” mode.

In dashboard mode, Xbox 360 functions in the role of a simple media player. While it’s not officially a DLNA-certified device, you can use Xbox 360 to browse the shared media libraries from Windows 7 PCs (there is also support for this in Windows Media Player 11) and pull content from those libraries for playback within the dashboard.

Using Xbox 360 for media playback

Using Xbox 360 for media playback

In extender mode, Xbox 360 (and other Extenders for Windows Media Center) is seen by Windows 7 PC’s on the network as both a Digital Media Player (DMP) and a Digital Media Renderer (DMR) device. Using the Extender for Windows Media Center on the Xbox 360, you can browse media libraries on other computers and pull that content for local playback, similar to the process of using Xbox 360 in dashboard mode. However, in extender mode Xbox 360 will also support “Play To” so that users of Windows 7 PC’s on the network can push content to it. All extenders, when associated with a Windows 7 PC, will be discovered in the “Play To” menu of other Windows 7 PCs.

Internet Access to Home Media

With Windows 7 we’ve also extended the media streaming experience outside the home and allow you to access your home media from anywhere in the world via the internet. We’ve made media streaming over the internet a natural extension of the experience within the home. For the experience to be seamless we needed to solve some significant technical challenges, such as:

  1. Discovery – Resolving the computer name at home to a routable IP address
  2. Privacy – Ensuring the home media is only accessible by authorized users
  3. Security – Encrypting browsing and streaming of media to prevent eavesdropping
  4. Reliability – Network connection speeds, media formats and bit rates, and router firewalls all create potential reliability issues for a seamless experience

To overcome these technical hurdles, we designed a model that uses an Online ID Provider to help facilitate discovery, privacy, and security. The new Online ID Provider infrastructure in Windows 7 allows you to link your Online ID (e.g. you@live.com) with your Windows user account. This enables an authentication/authorization server to provide the necessary privacy to establish a protected link between two Windows 7 PCs (e.g. your laptop on the road and your PC at home). Internet access to home media is enabled from the “Stream” menu in Windows Media Player.

Enabling internet access to home media.

The setup process walks you through linking an online ID with your Windows user account, which must be performed on both the home PC and remote PC. The same online ID must be used on both PCs in order to establish the connection between them. In order for remote PCs to access the home media collection, the PC at home (acting as a server) must be on a “Home” network location. Remote PCs (acting as clients) can browse and receive content streamed from the home PC from any network location (Public, Work, or Home). The network location is chosen when first connecting to any network and can be changed later from the Network and Sharing Center.

Specify the network to be a home network

Reliability - Network Connection Requirements

Streaming media over the internet from home works best with an “always on” broadband connection. Broadband uplink speeds vary from a modest 200Kbps to 10Mbps or more. Downlink connection speeds will also vary from crowded hotspots, hotel rooms, and wireless network connections in friends’ homes. Regardless of the uplink or downlink speeds, we wanted to ensure that even high bit rate content (e.g. high definition recorded TV) could be streamed with a good experience. The internet media streaming feature uses advanced bandwidth detection algorithms and end-to-end network heuristics to determine how to stream content that is at a higher bit rate than the smallest link in the network path.

Another challenge with internet access to home media is creating a peer-to-peer connection between the remote client PC and the home PC serving the media. A typical home network will get a single unique IP address from an internet service provider, and this IP address is shared by all the devices and PCs in the home using Network Address Translation (NAT), a function of an Internet Gateway Device (IGD) or Wireless Router. This creates a challenge for a remote PC or device to make an unsolicited connection inside the home, both in terms of resolving the home’s unique IP address and traversing the NAT to communicate directly to a unique PC or device on the home network.

Windows 7 employs some advanced NAT traversal technologies to establish the peer-to-peer connection and, with most IGDs, will allow a reliable connection to the home PC from any remote PC. For best results you should use a wireless router or IGD that has been certified by the Windows Logo program.

Media Formats

In Windows 7 we let you enjoy the media you want and don’t trouble you with the need to know about file types or codecs in most cases. (For more details, see Table 1 below). In addition to supporting local playback of new formats, we can also ensure that the content will play on devices that may not support the codec, bit rate, container, or format of that content. We accomplish this by using the new transcoding support in Windows 7.

Let’s say for instance you have a DivX movie you want to watch on your new DLNA certified television which only supports WMV and MPEG2. Windows 7 will determine the capability of the TV (codec, bit rate, etc.) and dynamically convert the DivX video to a format the TV can play. The general rule of thumb is: if Windows Media Player can play the content on the PC then the content will almost always play back on the network connected device. Bandwidth estimation techniques are used for media streaming within the home and over the internet, which enables Windows 7 to transcode using the most optimal format and bit rate.

Table of media format support.

 Table 1: New Decoders in Windows 7

The format and bit rate chosen for transcoding, especially for video, is highly dependent on the CPU performance of the transcoding PC as identified by its Windows Experience Index:

Windows Experience Index

We also created a flexible model for silicon partners to provide hardware accelerators that automatically work with media streaming and other Windows 7 features. This new acceleration model allows hardware developers to build media foundation proxies for media format encoders and decoders that are fully implemented in their hardware (perhaps in a GPU or additional hardware device). With hardware supported encoding and decoding, Windows 7 can offload the computationally demanding transcoding to dedicated hardware as a background task without affecting the CPU performance of the PC.

Digital Living Network Support in Windows 7

The Digital Living Network Alliance (DLNA) is a consortium of more than 200 companies interested in specifying technologies for exchanging media in home networks. The DLNA architecture is based on the UPnP specification, but in addition, DLNA specifies transport protocols (based on HTTP and RTP) and sets of media formats.

DLNA defines device roles (e.g. servers, players, renderers, etc.) and the protocols that these devices use to discover each other and communicate with each other (e.g. UPnP, HTTP, RTP, etc.). Windows 7 implements several of the DLNA device roles (see table 2 below) and it also implements the DLNA protocols required for communications and media exchange. With Windows 7, your PC will be able to interoperate with a broad variety of DLNA certified devices like TVs, stereo systems, cell phones, DVRs, game consoles, etc.

DLNA acronym table

Table 2: DLNA Device Profiles Supported by Windows 7

Because Windows 7 implements several device roles, there are different ways in which you could choose to use a Windows 7 PC at home. The remainder of this section explains the different scenarios.

Scenario 1: You store your music, video, and pictures on a Windows 7 PC. You’ve recently acquired a TV with a DLNA logo. Using the TV, you can browse the media library available on the Windows 7 PC. You can use the TV to watch the video and pictures, and listen to music stored on the PC. Figure 1 illustrates this scenario. In this case, the Windows 7 PC behaves as a DMS. Notice that this scenario was already available in Windows Vista and in Windows XP using Windows Media Player 11.

Figure 1: The TV unit browses and plays content stored in a PC

Figure 1: The TV unit browses and plays content stored in a PC

Scenario 2: You have a Network Attached Storage (NAS) device where you store your music, video, and pictures. The NAS device implements a DMS. You open Windows Media Player on a Windows 7 PC. You can find the NAS device using Windows Media Player, and you can browse the media library available on the NAS device. You can watch the video or pictures, and listen to music stored on the NAS device. Figure 2 illustrates this scenario. In this case, the Windows 7 PC behaves as a DMP.

Figure 2: A Windows 7 PC browses and plays content stored on a NAS device

Figure 2: A Windows 7 PC browses and plays content stored on a NAS device

Scenario 3: You have a cell phone that not only takes pictures but can push the pictures to a Windows 7 PC. You can show the pictures to your friends using the large-screen display of the PC without the need to physically transfer the files to the PC with a USB thumb drive, for example. Figure 3 illustrates this scenario. In this case, the cell phone acts as a DMS and a DMC and the Windows 7 PC behaves as a DMR.

Figure 3: A cell phone pushes pictures for display on a Windows7 PC

Figure 3: A cell phone pushes pictures for display on a Windows7 PC

Scenario 4: You’ve acquired a stereo system with the DLNA logo. On his Windows 7 PC, you’ve accumulated a vast collection of music with thousands of songs. Because your collection is large, you prefer to search, organize, and select songs using the rich capabilities of the Windows Media Player. Once you select the songs, you simply push the songs to your stereo system using “Play To.” You also have a NAS device containing an additional collection of music and video. You can use the Windows 7 PC to browse the content on the NAS device and push it to the stereo system. Figure 4 illustrates this scenario. In this case, the Windows 7 PC behaves as a DMS and a DMC.

Figure 4: A Windows 7 PC browses local content or shared content on the network. The PC then pushes the content for playback in a TV unit (DMR).

Figure 4: A Windows 7 PC browses local content or shared content on the network. The PC then pushes the content for playback in a TV unit (DMR).

There's definitely a lot to enjoy here.  Have fun!! 

-- Scott, Tim and the Devices & Media team

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  • please, I would like to know if you could tell me how to use windows homegroup with my ps3 slim?

    Could you drop me a note or reply @ SIKgamin@gmail.com

    my gameing clan is trying to find out!

  • I was very excited about the advertised media capabilities of Windows 7, but I have been very disappointed in practice. My home network consists of four PCs (2 Windows 7, 2 Vista) and a Netgear EVA 9150 "Entertainer".  The four PCs share a couple of printers and all can push and pull files among all others, and all PCs can push files to the EVA, but the EVA can only pull files from the Vista PCs.  The EVA correctly identifies medial folders on the W7 PCs but can't find any files.  My biggest frustration is with Windows Media Player Streaming.  My W7-64 laptop fails to find any media devices, while my W7-32 desktop successfully connects to the laptop media player but the streaming operation fails with a red X and the message, "failed to retrieve media information".  Any ideas how I can fix this?

  • I am impressed with the Windows 7 Media Center capabilities. I use it every day to record and play back OTA TV. All my computers at home are Windows 7.

    The big gap I see with the Media Center would be: I am unable to access the live tv streams from my netbook and notebook while the home computer is recording it. Or to be able to access the tuner from a remote computer as a share and thus access the TV.

    Also, I have noticed the Windows 7 play nice with each other but does not play nice with Sony PS3. The streaming works without a problem on PS3 but if you try to fast forward or rewind the media, it doesn't work any more.

  • Same problem as ajrstore.

    Is there a way to control transcoding in WMP? Turning it on or off for specific devices?

  • Seems the only thing that's missing is the ability to stream live TV from one W7 PC MCE and watch on another. Shame, I'd have thought that would be a key feature.    

  • You might want to try plugging directly into your modem. Sounds like your not getting a fast enough connection.

  • My Media Player in W7 have problem finding stream devices. Is there any site where this is discussed?

  • I'd like to give my two cents on W7 media streams, and home group networking -- there are some serious issues that exist.

    I recently updated both my laptop and desktop to W7 and have found both the new home group networking and the media streaming completely unusable. What DOES work just fine is accessing media, and regular files through normal windows shares. Video's load and play instantly through shares, via streaming, I get buffering messages then a frozen media player. Sometimes media player doesn't find available feeds at all, or gives odd messages that files don't exist when indeed they do.

    I will add that the streaming does work well to my xbox however, not using media center, but through normal media streaming.

    This leads me to believe that there is some difficulties in the client side of the media stream.

    In any event I'm sure the problems will be fixed in time. W7 feels the the best OS release in a long time.

  • I like windows 7, because I am able to stream multiple video formats

  • I have to admit and absolute change for the better with windows seven media streaming, although i have an issue i work for curry's.digital and personally as well as from customers i have encountered an issue. When i turn the windows media streaming service my RAM memory is over run up to 100% on a 4gb PC the service keeps on taking up more memory and in the end i have to manually end this process! what's going on surely this isn't meant to happen because my Pc then becomes extremely slow when the service is stopped the ram memory is empty'd and the pc will then run smoothly Please help my email address is rich21kong@yahoo.co.uk this will be a great help to me and my customers  thank you

  • Running the final version of 7 (7600) with a proper machine to support it. It streams absolutely everything without a glitch through my 360 (in extender mode, but not in dashboard mode) - and the Play To function works perfectly! I'm able to push contents to my Samsung LED TVs in two different rooms. Note: wired gigabit network.

  • Brilliant and easy solution. This is the fist serious step into the multimedia home.

  • Recently connected a new PC with win 7 however even though previous PC with XP was easily recognised by ps 3 and netgem, win 7 will not see these, nor will devices see win 7 pc. I have tried everything I can think of. Home group is of no use to find them. Strangely both the PC and PS3 and netgem all see my worldbook remote drive. I would appreciate any help you can give me.

  • Hi,

    Where can I locate the certification process guidelines for DMR devices/stacks so we can earn the "Compatible with Windows 7" logo on our product? We are already DLNA certified via CTT.

    Thanks,

    Buzz Dean

  • Hi,

    I have a problem since my wireless and wired network isn't on the same network. My Win7 PC is on the wireless and my TV is on the wired. I want to see my pictures from the laptop on the TV but since Win7 DLNA server sends SSDP multicasts with a TTL of 1 it never reaches my TV. SSDP's from my TV reaches Win7, so the multicast works. But how do i change the TTL of SSDP/DLNA packets in Windows 7?

    Thanks

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