The VideoLAN Forums

I am interesting in using this library to replace a current video implementation using DirectShowLib. The reason I am using DirectShowLib is that I must be able to do frame-stepping. I have a data file linked to each video which contains a distance-frame pairing. The distance is sequential, but the speed at which the distance changes is variable.

Code wise this looks something like the following example:

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long current = GetCurrentFrame(); long desired = GetDesiredFrame(distance); if (desired > (current + 50)) { JumpToFrame(desired); } else { StepOne(); }

Internally this uses the IVideoFrameStep interface defined by DirectShowLib. This function is also called as fast as possible.

The main reason I am interested in using VLC is that it would allow me to specify a codec directory. DirectShowLib uses any codec installed on the user's system. If they have some custom codec pack installed I can no longer guarantee that my video files will be played correctly. Unfortunately, without similar frame-stepping support any chance of using VLC is already out of the question.

Hi everyone! I'm having problems with libvlcnet, specifically while trying to get a single video frame (for a batch console thumbnailing application).

Being a console app, NO window, or anything related to any window, controls, etc. is acceptable... So, i made alittle program to test:

(Warning: CODE FRAGMENT)

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VlcDeployment vd = VlcDeployment.Default; vd.Install(true); Console.Write("VLC Deployed."); var mediaLibraryFactory = new VlcMediaLibraryFactory(new string[] { "--no-snapshot-preview", "--ignore-config", "--no-osd", "--plugin-path", Path.Combine(System.Diagnostics.Process.GetCurrentProcess().StartInfo.WorkingDirectory, "plugins") }); var output = new DZ.MediaPlayer.Io.PlayerOutput(); var player = mediaLibraryFactory.CreatePlayer(output); var input = new DZ.MediaPlayer.Io.MediaInput(DZ.MediaPlayer.Io.MediaInputType.File, fileName); player.SetMediaInput(input); player.Play();

This works. Ok, it didn't work at first, because the library kept insisting that i MUST create a window, contrary to the documentation of the PlayerOutput class parameterless constructor, "Creates a player output without window, which can be used to transcode or streaming".... YES that's what i need.

But:
I had to change line 1059 of VlcPlayer.cs to this (the if was not there at all):

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if(playerOutput.IsWindowDefined) ((DoubleWindowBase) playerOutput.Window).PlayerVisibleInternal = true;

and line 1048 to this:

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if(playerOutput.IsWindowDefined) getCurrentMediaPlayerInternal().SetDisplayOutput((int) ((DoubleWindowBase) playerOutput.Window).GetActiveWindowHandleInternal());

After that, it WORKED. But not as expected. A Window is automatically (hey, i didn't asked for that!) created, titled "VLC - Direct3D output".

ALSO (unrelated): It would be nice if the API could play files from System.IO.Stream. Then i could plug in a NetworkStream, FileStream, or any other.

Ok, now the question... How do i play a file and grab a frame out of it (the frame must stay in memory, not as a file. Yeah, VlcPlayer.TakeSnapshot(file, witdth, height) is not acceptable, i'm post processing the thumbnails adding watermarks and overlays, then drawing them over another in-memory image. Only then, saved as a PNG with alpha. I wonder why the library FORCES the developer to save a file).

Thanks in advance!!!!

Hello,

can someone post a piece of code showing how to stream with the library? I tried:

MediaInput input = new MediaInput(MediaInputType.NetworkStream, "rtsp:\\winterfeldt.webhop.org\\live.sdp");
vlcPlayerControl.Play(input);

but that was not really successfull. We are having a bunch of network cameras and would like to make use of the client inour c# applications.

Greatest would be source code as I haven't really got into the c++ part of the application.

Regards,
Götz