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  • H.264 over RTP - Identify SPS and PPS Frames

    - by Toby
    I have a raw H.264 Stream from an IP Camera packed in RTP frames. I want to get raw H.264 data into a file so I can convert it with ffmpeg. So when I want to write the data into my raw H.264 file I found out it has to look like this: 00 00 01 [SPS] 00 00 01 [PPS] 00 00 01 [NALByte] [PAYLOAD RTP Frame 1] // Payload always without the first 2 Bytes -> NAL [PAYLOAD RTP Frame 2] [... until PAYLOAD Frame with Mark Bit received] // From here its a new Video Frame 00 00 01 [NAL BYTE] [PAYLOAD RTP Frame 1] .... So I get the SPS and the PPS from the Session Description Protocol out of my preceding RTSP communication. Additionally the camera sends the SPS and the PPSin two single messages before starting with the video stream itself. So I capture the messages in this order: 1. Preceding RTSP Communication here ( including SDP with SPS and PPS ) 2. RTP Frame with Payload: 67 42 80 28 DA 01 40 16 C4 // This is the SPS 3. RTP Frame with Payload: 68 CE 3C 80 // This is the PPS 4. RTP Frame with Payload: ... // Video Data Then there come some Frames with Payload and at some point a RTP Frame with the Marker Bit = 1. This means ( if I got it right) that I have a complete video frame. Afer this I write the Prefix Sequence ( 00 00 01 ) and the NALfrom the payload again and go on with the same procedure. Now my camera sends me after every 8 complete Video Frames the SPS and the PPS again. ( Again in two RTP Frames, as seen in the example above ). I know that especially the PPS can change in between streaming but that's not the problem. My questions are now: 1. Do I need to write the SPS/PPS every 8th Video Frame? If my SPS and my PPS don't change it should be enough to have them written at the very beginning of my file and nothing more? 2. How to distinguish between SPS/PPS and normal RTP Frames? In my C++ Code which parses the transmitted data I need make a difference between the RTP Frames with normal Payload an the ones carrying the SPS/PPS. How can I distinguish them? Okay the SPS/PPS frames are usually way smaller, but that's not a save call to rely on. Because if I ignore them I need to know which data I can throw away, or if I need to write them I need to put the 00 00 01 Prefix in front of them. ? Or is it a fixed rule that they occur every 8th Video Frame?

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  • Facebook FXBML since Yesterday not rendering (IFRAME Canvas)

    - by ArneRie
    Hi Folks, since yesterday is my app not rendering the xfbml Tags (name and picture). Iam using the new JavaScript SDK inside an Canvas-Iframe Application. Firebug tells me the following inside the console: Get: http://0.channel20.facebook.com/x/3332504234/true/p_1348362044=0 And after a while: XFBML tags failed to render in 30000ms. Does someone has the same problems, or know why this happens?

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  • Implement Semi-Round-Robin file which can be expanded and saved on demand

    - by ircmaxell
    Ok, that title is going to be a little bit confusing. Let me try to explain it a little bit better. I am building a logging program. The program will have 3 main states: Write to a round-robin buffer file, keeping only the last 10 minutes of data. Write to a buffer file, ignoring the time (record all data). Rename entire buffer file, and start a new one with the past 10 minutes of data (and change state to 1). Now, the use case is this. I have been experiencing some network bottlenecks from time to time in our network. So I want to build a system to record TCP traffic when it detects the bottleneck (detection via Nagios). However by the time it detects the bottlenecking, most of the useful data has already been transmitted. So, what I'd like is to have a deamon that runs something like dumpcap all the time. In normal mode, it'll only keep the past 10 minutes of data (Since there's no point in keeping a boat load of data if it's not needed). But when Nagios alerts, I will send a signal in the deamon to store everything. Then, when Naigos recovers it will send another signal to stop storing and flush the buffer to a save file. Now, the problem is that I can't see how to cleanly store a rotating 10 minutes of data. I could store a new file every 10 minutes and delete the old ones if in mode 1. But that seems a bit dirty to me (especially when it comes to figuring out when the alert happened in the file). Ideally, the file that was saved should be such that the alert is always at the 10:00 mark in the file. While that is possible with new files every 10 minutes, it seems like a bit dirty to "repair" the files to that point. Any ideas? Should I just do a rotating file system and combine them into 1 at the end (doing quite a bit of post-processing)? Is there a way to implement the semi-round-robin file cleanly so that there is no need for any post-processing? Thanks Oh, and the language doesn't matter as much at this stage (I'm leaning towards Python, but have no objection to any other language. It's less of an issue than the overall design)...

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  • Zen Code + jQuery

    - by Josh Cornstone
    Hi, I just read this article at Smashing Magazine (http://www.smashingmagazine.com/2009/11/21/zen-coding-a-new-way-to-write-html-code/) about Zen Code. Maybe there is any jQuery plugin for this? Might be good for json data inserting/templating.

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  • how to customize google map for own site?

    - by manish
    Hi, i want to create google map for own site.my task is that i have to fetch some information from database and i want to show in google map,with my icon.some thing like "http://www.jaap.nl/koophuizen/Groningen///_/_/1/?rad=5km&min=450000&max=1000000" in right side ,google map is showing,excatly i want to show my google map.if any have idea please help me Thanks Manish [email protected]

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  • Java - Regex problem

    - by Yatendra Goel
    I want a regex to find the following types of strings: http://anything.abc.tld http://anything.abc.tld/ where abc - abc always remains abc anything - it could be any string tld - it could be any tld (top-level-domain) like .com .net .co.in .co.uk etc.

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  • XSLT Attribute not being added

    - by shaunhare.co.uk
    Trying to mark radio inputs as selected with XSLT 1.0 using the below xslt code but this does not produced the desired result desrired result <input type="radio" value="available" title="email" selected="selected" /> Actual output <input type="radio" value="available" title="email" selected /> Anyone any ideas why not please? XSLT <xsl:variable name="selected">selected</xsl:variable> <xsl:for-each select="item"> <tr> <td><xsl:value-of select="title" /></td> <td> <input type="radio" value="available" > <xsl:attribute name="name"> <xsl:value-of select="title" /> </xsl:attribute> <xsl:if test="category='available'"> <xsl:attribute name="selected"> <xsl:value-of select="$selected"/> </xsl:attribute> </xsl:if> </input> </td> <td> <input type="radio" value="unavailable" > <xsl:attribute name="name"> <xsl:value-of select="title" /> </xsl:attribute> <xsl:if test="category='unavailable'"> <xsl:attribute name="selected"> <xsl:value-of select="$selected"/> </xsl:attribute> </xsl:if> </input> </td> <td> <input type="radio" value="warning" > <xsl:if test="category='warning'"> <xsl:attribute name="selected"> <xsl:value-of select="$selected"/> </xsl:attribute> <xsl:attribute name="name"> <xsl:value-of select="title" /> </xsl:attribute> </xsl:if> </input> </td> </tr> </xsl:for-each>

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  • PayPal IPN on port other than 80

    - by Ian Silber
    As anybody tried using Paypal's IPN on a port other than 80? I'm trying to specify a URL like http://domain.com:8080/url/to/ipn.php but the IPN request isn't getting through. If I hit the URL directly from my browser it works fine.

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  • Endpoints or URIs for a WCF client test-drive

    - by Xencor
    I am aware of the Amazon.com exposed URIs ... which I need to sign up for and then on I can use them ... roll-up my sleeves and get some WCF Client test-drive coding. What are the other such publicly exposed end points that reflect real or almost real-time services? Any offerings specifically from Microsoft? I am basically looking for writing WCF clients for both WCF and non-WCF services...RESTful ones and even otherwise.

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  • How do I create breadcrumbs like in this Apple site ?

    - by Jsmith
    I've seen this page here and I really like the breadcrumbs at the bottom. How do I achieve this behavior ? The breadcrumbs at the bottom stays at the bottom and nomatter if you're scrolling down, it is still there. http://developer.apple.com/iphone/library/navigation/index.html?section=Resource+Types&topic=Getting+Started Please someone help me with some good code. Because I have no clue.

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  • Flex remoting and progress events?

    - by Cambiata
    Is there a way to monitor the loading progress (percent progress bar style) when using Flex remoting? I'm trying out Flash Builder 4 with it's new data services features, but I can't find any pgrogress event stuff somewhere. This article by Robert Taylor http://www.roboncode.com/articles/144 indicates that it might not be possible...

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  • IE-only Styling for jQuery qTip

    - by Kevin C.
    I'm using jquery.qTip on http://comps.gunnjerkens.com/phws/services/ Looks beautiful with the drop shadow and rounded borders in modern browsers...unfortunately the drop shadow is lost on IE. So I want to specify an IE-only rule that makes the border a different color than white. Here's how I currently have it setup: $(this).qtip({ content: the_content, position: { corner: { target: 'bottomLeft', tooltip: 'topLeft' }, adjust: { screen: true } }, style: { border: { radius: 4, color: '#FFFFFF' }, color: '#7D9240' } }); // qtip() }); I appreciate any help!

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  • How to save preferences to somewhere other than SharedPreferences

    - by Adrian
    My application is used on multiple platforms so it saves it preferences to a file (rather than to the standard Android SharedPreferences). Is there any easy of reusing the PreferenceActivity to save preferences to a file or is it a case of creating a whole new activity to do the job? If the latter is the case is there a layout I can use that will make the activity look like the normal preferences screen? PreferenceActivity uses com.android.internal.R.layout.preference_list_content but this doesn't appear to be available to apps for reuse.

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  • Open youtube video in Fancybox jquery

    - by Alexander Corotchi
    Can I open youtube video in fancybox. I have a list of youtube videos links , for ex: <a href="http://www.youtube.com/watch?v=PvbqV8W96D0" class="more">Play</a> and fancubox : $("a.more").fancybox({ 'titleShow' : false, 'transitionIn' : 'elastic', 'transitionOut' : 'elastic' }); I don't want to create for each video new embed object. There is some plug in, or a way to do that ?

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  • Organizing memcache keys

    - by Industrial
    Hi! Im trying to find a good way to handle memcache keys for storing, retrieving and updating data to/from the cache layer in a more civilized way. Found this pattern, which looks great, but how do I turn it into a functional part of a PHP application? The Identity Map pattern: http://martinfowler.com/eaaCatalog/identityMap.html Thanks!

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  • c# find mail by from mail

    - by Sebastian
    Hi! How to find items in Outlook inbox by from email? This version works and finds email: String sCriteria = "[From] = 'Sebastian Nowak'"; Outlook.Items filteredItems = inbox.Items.Restrict(sCriteria); This version doesn't work, doesn't find any mail: String sCriteria = "[From] = 'mymail@mydomain.com'"; Outlook.Items filteredItems = inbox.Items.Restrict(sCriteria); How do I should search by email from wich mail was sent.

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  • Apache2 php fastcgi, run for each request.

    - by SPnova
    I've installed php fastcgi for Apache2 by this doc: http://library.linode.com/web-servers/apache/php-cgi/ubuntu-9.10-karmic Pages is opening fine. But I don't understand why I can't see php5-cgi process [ top ] Looks like apache run php5-cgi for each request, but processes should be already run. Could you help me to find the problem?

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  • Pop3 to SMTP message custom forwarder in C#

    - by Troy
    I'd like to write a service that periodically checks a POP3 account for new messages and based on custom business logic forwards the messages to an appropriate "To", and possibly changes the "From" as well. I might need to keep some messages on the server until certain conditions are ready for them to be forwarded. I found a sample using Chilkat .NET components that might work: http://www.example-code.com/csharp/pop3_forwarder.asp My question is: Are there any other examples of this in the .NET space using any other components? Thanks!

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  • Datagrid using usercontrol

    - by klawusel
    Hello I am fighting with this problem: I have a usercontrol which contains a textbox and a button (the button calls some functions to set the textbox's text), here is the xaml: <UserControl x:Class="UcSelect" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" x:Name="Control1Name" <Grid x:Name="grid1" MaxHeight="25"> <Grid.ColumnDefinitions> <ColumnDefinition /> <ColumnDefinition Width="25"/> </Grid.ColumnDefinitions> <Grid.RowDefinitions> <RowDefinition Height="25"/> </Grid.RowDefinitions> <TextBox x:Name="txSelect" Text="{Binding UcText, Mode=TwoWay}" /> <Button x:Name="pbSelect" Background="Red" Grid.Column="1" Click="pbSelect_Click">...</Button> </Grid> And here the code behind: Partial Public Class UcSelect Private Shared Sub textChangedCallBack(ByVal [property] As DependencyObject, ByVal args As DependencyPropertyChangedEventArgs) Dim UcSelectBox As UcSelect = DirectCast([property], UcSelect) End Sub Public Property UcText() As String Get Return GetValue(UcTextProperty) End Get Set(ByVal value As String) SetValue(UcTextProperty, value) End Set End Property Public Shared ReadOnly UcTextProperty As DependencyProperty = _ DependencyProperty.Register("UcText", _ GetType(String), GetType(UcSelect), _ New FrameworkPropertyMetadata(String.Empty, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault, New PropertyChangedCallback(AddressOf textChangedCallBack))) Public Sub New() InitializeComponent() grid1.DataContext = Me End Sub Private Sub pbSelect_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) 'just demo UcText = UcText + "!" End Sub End Class The UserControl works fine when used as a single control in this way: <local:UcSelect Grid.Row="1" x:Name="ucSingle1" UcText="{Binding FirstName, Mode=TwoWay}"/> Now I wanted to use the control in a custom datagrid column. As I like to have binding support I choosed to derive from DataGridtextColumn instead of using a DataGridTemplateColumn, here is the derived column class: Public Class DerivedColumn Inherits DataGridTextColumn Protected Overloads Overrides Function GenerateElement(ByVal oCell As DataGridCell, ByVal oDataItem As Object) As FrameworkElement Dim oElement = MyBase.GenerateElement(oCell, oDataItem) Return oElement End Function Protected Overloads Overrides Function GenerateEditingElement(ByVal oCell As DataGridCell, ByVal oDataItem As Object) As FrameworkElement Dim oUc As New UcSelect Dim oBinding As Binding = CType(Me.Binding, Binding) oUc.SetBinding(UcSelect.UcTextProperty, oBinding) Return oUc End Function End Class The column is used in xaml in the following way: <local:DerivedColumn Header="Usercontrol" Binding="{Binding FirstName, Mode=TwoWay}"></local:DerivedColumn> If I start my program all seems to be fine, but changes I make in the custom column are not reflected in the object (property "FirstName"), the changes are simply rolled back when leaving the cell. I think there must be something wrong with my GenerateEditingElement code, but have no idea ... Any Help would really be appreciated Regards Klaus

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  • WCF RIA Services Silverlight 3.0

    - by John
    Hi, I have downloaded WCF RIA Services Beta from the following website: WCF RIA Services Beta for Visual Studio 2008 SP1 http://www.microsoft.com/downloads/details.aspx?FamilyID=76bb3a07-3846-4564-b0c3-27972bcaabce&displaylang=en#filelist But I am unable to add a reference to the following assembly : system.Windows.Ria.Data I searched at the downloaded location c:\Program files\Microsoft SDK's\RIA Services but i am unable to find this dll. Would appreciate if you could point me what I am missing here.

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