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Closed Issue: Two MediaUriElements in one application flickers / shows black screen in both MediaElements [11712]

boehserhaluter — Thu, 16 May 2013 11:26:45 GMT

Hi,

using 2 MediaUriElements in one application flickers / shows black screen in both MediaElements.

The bug is reproducable, simply adding a second MediaUriElement in the SampleApplication MediaUriPlayerWindow.xaml.

Change:
<code>
<Border x:Name="mediaPlayerContainer"
HorizontalAlignment="Stretch"
VerticalAlignment="Stretch"
Width="Auto"
Height="Auto">
<DirectShowControls:MediaUriElement x:Name="mediaPlayer"
Volume="1"
Source="{Binding ElementName=fileDialog, Path=FilePath}"
Stretch="Uniform"
VideoRenderer="VideoMixingRenderer9"
LoadedBehavior="Play"
SpeedRatio="1.0"
Loop="True"/>
</Border>

</code>
to:

<code>
<StackPanel>
<Border x:Name="mediaPlayerContainer"
HorizontalAlignment="Stretch"
VerticalAlignment="Stretch"
Width="Auto"
Height="Auto">
<DirectShowControls:MediaUriElement x:Name="mediaPlayer"
Volume="1"
Source="{Binding ElementName=fileDialog, Path=FilePath}"
Stretch="Uniform"
VideoRenderer="VideoMixingRenderer9"
LoadedBehavior="Play"
SpeedRatio="1.0"
Loop="True"/>
</Border>
<Border x:Name="mediaPlayerContainer2"
HorizontalAlignment="Stretch"
VerticalAlignment="Stretch"
Width="Auto"
Height="Auto">
<DirectShowControls:MediaUriElement x:Name="mediaPlayer2"
Volume="1"
Source="{Binding ElementName=fileDialog, Path=FilePath}"
Stretch="Uniform"
VideoRenderer="VideoMixingRenderer9"
LoadedBehavior="Play"
SpeedRatio="1.0"
Loop="True"/>
</Border>
</StackPanel>

</code>
and set the height to 800 or resize the window.

The changed xaml file is attached.

Any idea how to fix this ?

Greetings Dominik

Created Issue: VideoCaptureElement do not work [11767]

lchl — Thu, 09 May 2013 14:31:42 GMT

when i use vs2012 debug ,it can show the video
but when i execute the exe,it can not work,no video
I hope have someone can understand .
thanks
my email:LoveNear@outlook.com

Commented Issue: Two MediaUriElements in one application flickers / shows black screen in both MediaElements [11712]

boehserhaluter — Thu, 09 May 2013 06:03:31 GMT

Thanks, works well !

Edited Issue: Two MediaUriElements in one application flickers / shows black screen in both MediaElements [11712]

jmorrill — Wed, 08 May 2013 19:27:12 GMT

Commented Issue: Two MediaUriElements in one application flickers / shows black screen in both MediaElements [11712]

jmorrill — Wed, 08 May 2013 19:26:30 GMT

Get the latest VMR9Allocator.cs.

This should be fixed now

Created Issue: Two MediaUriElements in one application flickers / shows black screen in both MediaElements [11712]

boehserhaluter — Wed, 17 Apr 2013 09:30:44 GMT

Commented Issue: Stuttering Video [11523]

Johnwrnd — Sun, 17 Mar 2013 20:15:59 GMT

We have been using the MediaKit to play out video in our production application. It has worked well on a number of systems. We have one system in a remote location where the video will repeatedly pause and then fast forward to try and catch up. We have re-introduced the WPF MediaElement to verify that the problem lies with MediaKit. We can't use MediaElement because it does not play out video as smoothly. Does anyone know what might be causing this?
Comments: ** Comment from web user: Johnwrnd **

Stuttering Video is mostly caused by the ValueChanged Event of your slider. Most People use the slider to Show and Change the Position of the current media. However that causes stuttering Video as well. Reasons??? quite simple:

1. On every value changed the media Position is set
2. Timers used to update the slider value Triggers the value changed continuesly changing the media Position value over and over

This two Points lead to one thing.. Stutter ;) if that's the case handle value changed on slider mouse_down or mouse_up instead of slider_value_changed. Hope it helps.

Created Issue: Stuttering Video [11523]

markgenovese — Fri, 25 Jan 2013 13:51:03 GMT

Commented Issue: unable to replay a clip with MediaElement more than once [10468]

ixvorb — Tue, 18 Dec 2012 15:16:19 GMT

There's a bug in MediaElement where setting the MediaPosition to 0 and calling Play() will only work once. After this the MediaElement will fail to replay the clip.
 
As well to note, the MediaPosition property after the initial play will have a value of the length of the clip, but after the replay it will have a value of 0 or whatever it was set to even though the clip played to the end.

Comments: ** Comment from web user: ixvorb **

Hi. I have recently going into similar issue. Try to add call to StartGraphPollTimer() into MediaPlayerBase.Play() method.

Created Issue: How to properly add a reference to WPF MediaKit? [11188]

ruudlenders — Fri, 14 Sep 2012 07:18:47 GMT

Since I'm interested in using DirectShow and / or Media Foundation in WPF, the WPF MediaKit seems like a good library for my needs. However, I haven't got it to work yet.

2 out of 5 .dlls can't be added as reference to my project. To following error is shown:

A reference to '....dll' could not be added. Please make sure that the file is accessible, and that it is a valid assembly or COM component.

The other dlls seem to work just fine, in code. But in the XAML designer, the WPF Media Kit doesn't seem to be usable at all.

xmlns:mk="clr-namespace:WPFMediaKit.DirectShow.Controls;assembly=WPFMediaKit"

The above line generates the following error:

Unable to load the metadata for assembly 'WPFMediaKit'. This assembly may have been downloaded from the web. See http://go.microsoft.com/fwlink/?LinkId=179545. The following error was encountered during load: Could not load file or assembly 'WPFMediaKit, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified.

Despite of this error, running my project is no problem.

What's happening here? And since when can you run projects whilst having errors in it?

Commented Issue: SetRate() using IMediaSeeking interface doesn't work [10723]

johnsonvictor — Fri, 18 May 2012 12:34:22 GMT

SetRate() in IMediaSeeking interface to set different playback rate. When I call SetRate(1), it works and return value is zero.But when I set other than '1' like SetRate(2), SetRate call Failed and return value is -2147024809 . How do make this works?
Comments: ** Comment from web user: johnsonvictor **

I found the problem .I just did the following

Comment the following line in OpenSource() menthod from MediaUriPlayer.cs

InsertAudioRenderer(AudioRenderer)

It works for me.

Commented Issue: SetRate() using IMediaSeeking interface doesn't work [10723]

sunnyyao — Fri, 18 May 2012 05:22:38 GMT

However, for a same WMV file, using Windows 7 Media Player, I can play with a rate ranging from 0.5 to 2. With WPFMediaKit, I cannot play with any other ratio than 1. Do you know why?

Commented Issue: SetRate() using IMediaSeeking interface doesn't work [10723]

schungx — Fri, 04 May 2012 05:29:34 GMT

Setting playback rates in DiectShow (which is what WPF MediaKit uses) depends on the decoding filter. Some video formats (I believe MPEG-I) supports rates up to 4x, some supports rates up to 2x, most others not at all. The SetRate may fail or succeed but does nothing -- I've encountered both cases.

Created Issue: SetRate() using IMediaSeeking interface doesn't work [10723]

johnsonvictor — Wed, 02 May 2012 19:38:31 GMT

Created Issue: unable to replay a clip with MediaElement more than once [10468]

jpchow — Mon, 05 Mar 2012 18:55:55 GMT

There's a bug in MediaElement where setting the MediaPosition to 0 and calling Play() will only work once. After this the MediaElement will fail to replay the clip.

As well to note, the MediaPosition property after the initial play will have a value of the length of the clip, but after the replay it will have a value of 0 or whatever it was set to even though the clip played to the end.

Commented Issue: Play video/audio stream from byte[] [4255]

kore_sar — Fri, 27 Jan 2012 10:41:29 GMT

It would be awesome if one could visualize a stream through a byte array.
Comments: ** Comment from web user: kore_sar **

Than I would recommend you to use AForge framework. You can find examples of using it for visualization in iSpy opensource project.

Commented Issue: Play video/audio stream from byte[] [4255]

MihaMarkic — Thu, 26 Jan 2012 17:14:15 GMT

It would be awesome if one could visualize a stream through a byte array.
Comments: ** Comment from web user: MihaMarkic **

Whatever format is supported with files.

Commented Issue: Play video/audio stream from byte[] [4255]

kore_sar — Thu, 26 Jan 2012 15:02:10 GMT

It would be awesome if one could visualize a stream through a byte array.
Comments: ** Comment from web user: kore_sar **

Of what format?

Commented Issue: EnableSampleGrabbing not working on Vista Machine [8625]

kore_sar — Thu, 26 Jan 2012 14:57:52 GMT

I tried to get the code running on two of my machines here (on 32 bit W7, the other 32 bit Vista).

At first, neither would sample grab. Then I got the latest source, and rebuilt, and the W7 machine would, but the Vista one would not with the same camera.

I'm trying to figure out what's going on, and I saw the message here, http://wpfmediakit.codeplex.com/discussions/78215 which seems to be partialy incorporated in VideoCapturePlayer.cs changeset 31686, but then removed in changeset 41623.

Any suggestions on how to go about debugging this?
Comments: ** Comment from web user: kore_sar **

Please, see my purpose here: http://wpfmediakit.codeplex.com/discussions/78215
That might help you.

Commented Issue: EnableSampleGrabbing not working on Vista Machine [8625]

kore_sar — Thu, 26 Jan 2012 13:49:58 GMT

I am not agree about changeset numbers, but I truly share your concerns about sample grabbing callback, which is not working at my Win7 64bit.