ManagedMediaHelpers

NEW POST: Direct sample access ?

programista — Sat, 08 Aug 2009 20:46:57 GMT

Hi.

Is there any way to get to sample data of a mp3 file, and use it for fft calculations ?

NEW POST: ASF live stream through HTTP

loarabia — Sat, 27 Jun 2009 06:52:04 GMT

dolphy wrote:
Hi,

I am working on making sure live ASF streams from our opensource streaming server (Flumotion) are able to play fine in the SilverLight player.

We found out that although the streams are playing fine in Windows Media Player, Silverlight seems to not handle very well our streams. It's hard to figure out why but my best guess is that Silverlight expects any ASF feed coming from an HTTP server (not MMS) being a progressive download. The fact that we don't set a content-length and that the broadcast flag is set does not seem to help...

I am wondering if there's any way to debug that or if our only solution is to implement a MediaStreamSource to implement our own ASF parsing code.

I'd like to have your opinion on that please.

Thanks in advance,

Best regards,

Dolphy

It would probably be best to post a question like this on the Silverlight.net forums (specifically the audio/video one) if you haven't already done so. However, to answer the question fully I would probably need a bit more detail such as what you are seeing to lead you to say that Silverlight isn't handling your streams very well is it an error, something coming back to the server unexpectedly, a capabilitiy such as seek not working, etc. Also, knowing the version of Silverlight being used is helpful.

Silverlight's MediaElement can natively accept streams in two different formats either a) raw HTTP as a progressive download (http:// and https:// monikers) or b) MS-WMSP as a WMS stream (mms:// moniker). It sounds to me like you are attempting the latter. If so, setting a stream without a content-length and setting the ASF broadcast flag might make certain aspects of streaming such as seeking to behave unexpectedly although I wouldn't expect it to break general playback.

Sadly, there isn't a direct way to debug the internals of Silverilght's streaming source today. My best advice would be to check out a similar stream from WMS as those streams you are trying to send from Flumotion as well as sniffing the network traffic using Network Monitor to ensure that the protocol over the wire adheres to the MS-WMSP spec. I would also check the behavior in WMP to see how it compares.

If you cannot figure out what is happening you can certainly attempt to build an ASF parser in managed code and use that although I don't think you should need to.

NEW POST: ASF live stream through HTTP

dolphy — Sun, 14 Jun 2009 15:54:54 GMT

Hi,

I am working on making sure live ASF streams from our opensource streaming server (Flumotion) are able to play fine in the SilverLight player.

We found out that although the streams are playing fine in Windows Media Player, Silverlight seems to not handle very well our streams. It's hard to figure out why but my best guess is that Silverlight expects any ASF feed coming from an HTTP server (not MMS) being a progressive download. The fact that we don't set a content-length and that the broadcast flag is set does not seem to help...

I am wondering if there's any way to debug that or if our only solution is to implement a MediaStreamSource to implement our own ASF parsing code.

I'd like to have your opinion on that please.

Thanks in advance,

Best regards,

Dolphy

CREATED ISSUE: Update for Silverlight 2 RTM

mscherotter — Tue, 19 May 2009 18:18:07 GMT

The HTML test page needs to be updated for Silverlight 2 RTM:
<object data="data:application/x-silverlight-2," type="application/x-silverlight-2" width="100%" height="100%">
<param name="source" value="ClientBin/Mp3MediaStreamSourceDemo.xap"/>
<param name="onerror" value="onSilverlightError" />
<param name="background" value="gray" />

<a href="http://go.microsoft.com/fwlink/?LinkID=124807" style="text-decoration: none;">
<img src="http://go.microsoft.com/fwlink/?LinkId=108181" alt="Get Microsoft Silverlight" style="border-style: none"/>
</a>
</object>

NEW POST: H264 Video

gudy — Thu, 09 Apr 2009 18:07:44 GMT

Have you played with MediaStreamSource to render video, and especially h264 frames?
I'd be interested in any info relating to the actual encoding of the CodecPrivateData entry for H264, as well as the expected format for each h264 frame.

thanks in advance.

NEW POST: can i write flv driver ?

loarabia — Sat, 04 Apr 2009 02:09:44 GMT

I may still be missing something but it sounds like you probably want a server side playlist (.wsx) with a clipBeing and clipEnd attribute or a client side playlist (.asx) with similar attributes. However, you could use a MediaStreamSource for the same purpose as well if you wanted.

wangwenbing wrote:
Hello! I mean you may not understand. I want to play wmv format for streaming media, to play multiple files and control each file startposition and endposition, designated in accordance with the url you say to mediaElement is not required for purposes and does not know if there was any good method, thank you !

NEW POST: can i write flv driver ?

wangwenbing — Wed, 04 Feb 2009 01:39:06 GMT

Hello! I mean you may not understand. I want to play wmv format for streaming media, to play multiple files and control each file startposition and endposition, designated in accordance with the url you say to mediaElement is not required for purposes and does not know if there was any good method, thank you !

NEW POST: can i write flv driver ?

loarabia — Sat, 31 Jan 2009 00:12:38 GMT

My apologies for taking co long to get back to you. I am not sure what you mean. To playback WMVs in Silverlight, I would recommend just directly setting the source of the MediaElement to the Url of your WMV file. That should just work and you should not need a MediaStreamSource for that. The times when you should consider MediaStreamSource is if you need to do some deep changes to the container or to the way the file is transported over the network.

wangwenbing wrote:
Hi!
I need MediaStreamSource.
I'm simply trying to use MediaElement to play a MediaStreamSource of wmv. bu i cannot.
Do I need MediaStreamSource for a workaround?
Thanks very much for any help.

NEW POST: can i write flv driver ?

wangwenbing — Fri, 23 Jan 2009 07:59:57 GMT

Hi!
I need MediaStreamSource.
I'm simply trying to use MediaElement to play a MediaStreamSource of wmv. bu i cannot.
Do I need MediaStreamSource for a workaround?
Thanks very much for any help.

COMMENTED ISSUE: General mp3 issues

loarabia — Sat, 13 Dec 2008 01:02:36 GMT

I really like the concept and need a way to read ID3 meta info so I took a look at this library. I ran the demo project and tried it on several mp3 files. Unfortunately it err'd out on most of them (5 out 6). All of the files are playable using the MediaElement.

I didn't spend much time debugging but all of the errors were either InvalidOperatonExceptions with the message "Frame Is Not MP3" or Null exceptions because the Bitrate lookup failed due to the BitrateIndex having a value of 15.

Any known limitations / constraints / etc that I should be aware of ?

Comments: I've seen things from time to time regarding that. It is likely ID3 tags are throwing the parsing off because they aren't using sync-safe or something like that ints. I haven't run this against every possible Mp3 file that is out there by a long shot and I haven't made the code super robust because I wanted this to be primarly useful for teaching the absolute basics of MSS. There are ID3 libs that you can get that if they parse out all of the ID3 tags would probably leave the stream in a better position to directly use the ManagedMediaHelpers.

NEW POST: can i write flv driver ?

loarabia — Sat, 13 Dec 2008 00:58:27 GMT

The MediaStreamSource in Silverlight takes in only encoded content. So you would have to transcode your content from FLV's VP6 codec into a codec that Silverlight supports (which would be WMA/WMV/Mp3). With Silverlight 3, it has been announced that H264 and AAC will be supported which is what is used in F4Vs.

CREATED ISSUE: General mp3 issues

jasoncac — Fri, 12 Dec 2008 02:32:58 GMT

NEW POST: can i write flv driver ?

Raimon — Tue, 09 Dec 2008 12:58:06 GMT

Hi!

can i write flv driver for SL 2 using ManagedMediaHelpers?

NEW POST: ManagedMediaHelpers 1.1.0.0

loarabia — Sat, 15 Nov 2008 09:57:04 GMT

Released 11.14.2008
Updates in the release

Updates the Property name SelectedFiles from Beta2 to Files so the libraries build with Silverlight 2 RTM
Removed Beta2 MediaStreamSource workaround involving a timer which ticks once in order to open the media files

Feel free to start more discussions here if there are questions about the library

UPDATED RELEASE: ManagedMediaHelpers 1.1.0.0 (Nov 14, 2008)

Sat, 15 Nov 2008 09:53:34 GMT

CREATED RELEASE: ManagedMediaHelpers 1.1.0.0 (Nov 14, 2008)

Sat, 15 Nov 2008 09:52:32 GMT

RELEASED: ManagedMediaHelpers 1.0.0.0 (Sep 26, 2008)

Sat, 27 Sep 2008 09:01:45 GMT

UPDATED RELEASE: ManagedMediaHelpers 1.0.0.0 (Sep 26, 2008)

Sat, 27 Sep 2008 09:01:45 GMT

UPDATED WIKI: Home

loarabia — Sat, 27 Sep 2008 08:25:57 GMT

Resource Page Description
Two Silverlight class libraries and an example Silverlight Application to jump start development with and learning about Silverlight's MediaStreamSource.

Why ?
This project grew out of 3 desires:

Provide a MediaStreamSource sample that is useful for educating developers on development with Silverlight's MediaStreamSource
Provide helper classes which make it easier to use MediaStreamSource for certain scenarios (Mp3 for now)
Prime the Silverlight development community with MediaStreamSource code to see what creative things can be built

What is in this project ?
This project contains 4 things.

A Silverlight class library, MediaParsers, which contains helper classes for working with Mp3 files, including tools to help find the right point in an Mp3 file to begin playback from and Managed implementations of fundamental media structures.
A Silverlight Test Project built for nunit, MediaParsersTests, which provides core code coverage for the MediaParsers library.
A Sliverlight class library, Mp3MediaStreamSource, which has arguably the simplest logic imaginable for using Mp3 file streams with a MediaStreamSource.
A Sliverlight Application demo, Mp3MediaStreamSourceDemo and Mp3MediaStreamSourceDemoWeb, which shows the simplest interaction between a MediaElement and a MediaStreamSource.

What is a MediaStreamSource ?
The MediaStreamSource is a piece of the Silverlight runtime that removes a the influence of a media file's container, giving developers direct access to APIs for manipulating encoded elementary audio and video streams.

Why would anyone want to remove the container ?
For one thing, having access to elementary streams means that developers can now implement scenarios that other solutions haven't necessarily provided thus far. One example of this is adaptive streaming or multi-bitrate support as was seen during the 2008 Olympics.

For another reason, having access to elementary streams allows developers to implement scenarios that the Silverlight runtime hasn't had a chance to implement yet or that the runtime might not be able to implement in the same timeframe that a developer wants it. Examples of this could be, RTSP:T protocol support, SHOUTcast protocol support, seamless audio looping, ID3 v1 and ID3 v2 metadata support, and many other scenarios.

Tools used by this project
Visual Studio 2008 Professional
Nunit
Silverlight Nunit Project Template
FxCop
StyleCop

Who are you?
Larry Olson
Blog

UPDATED WIKI: Home

loarabia — Sat, 27 Sep 2008 08:25:09 GMT

Provide a MediaStreamSource sample that is useful for educating developers on development with Silverlight's MediaStreamSource
Provide helper classes which make it easier to use MediaStreamSource for certain scenarios (Mp3 for now)
Prime the Silverlight development community with MediaStreamSource code to see what creative things can be built

What is in this project ?
This project contains 4 things.

A Silverlight class library, MediaParsers, which contains helper classes for working with Mp3 files, including tools to help find the right point in an Mp3 file to begin playback from and Managed implementations of fundamental media structures.
A Silverlight Test Project built for nunit, MediaParsersTests, which provides core code coverage for the MediaParsers library.
A Sliverlight class library, Mp3MediaStreamSource, which has arguably the simplest logic imaginable for using Mp3 file streams with a MediaStreamSource.
A Sliverlight Application demo, Mp3MediaStreamSourceDemo and Mp3MediaStreamSourceDemoWeb, which shows the simplest interaction between a MediaElement and a MediaStreamSource.