Memory Mapped Exception on MediaPlayer.Play(Uri)

[jsymon]

I have an issue about Vlc.DotNet.

Generic information

• Vlc.DotNet version : (3.0.0-develop343)
• Vlc.DotNet project used : (WPF)
• libvlc version : (x64) - Referencing VLC libvlc 3.0.6
• .net version : (4.6.2)
• Project language : (C#)
• Project build architecture : (AnyCPU / x64)
• Operating system : (Windows 10) (x64)

Summary

Upgraded to 343 from 322.

Calling SourceProvider.MediaPlayer.Play(FileInfo); works fine, however calling SourceProvider.MediaPlayer.Play(uri, new[] { "" });, with a UDP uri provokes the following crash:

[ System.ArgumentOutOfRangeException: A positive number is required.
Parameter name: capacity
   at System.IO.MemoryMappedFiles.MemoryMappedFile.CreateNew(String mapName, Int64 capacity, MemoryMappedFileAccess access, MemoryMappedFileOptions options, MemoryMappedFileSecurity memoryMappedFileSecurity, HandleInheritability inheritability)
   at Vlc.DotNet.Wpf.VlcVideoSourceProvider.VideoFormat(IntPtr& userdata, IntPtr chroma, UInt32& width, UInt32& height, UInt32& pitches, UInt32& lines)](url)

Edit, tried 'develop333' revision, which works completely fine with Uri and FileInfo.

• I confirm that my issue doesn't happen in VLC itself.

[jeremyVignelles]

develop322 works fine?
What's your stream?

[jsymon]

develop322 works fine?

Yes, and develop333 also.

What's your stream?

It's an internal UDP stream, apologies.

[jsymon]

Have attached the following stackdump if interested:

[jeremyVignelles]

Ok, then, this is introduced by PR #526 .

Can you call (VideoTrack)MediaPlayer.GetMedia().Tracks.First(track => track.Type == MediaTrackTypes.Video).TrackInfo and look at Width and Height?

I'd bet they are 0...

[jsymon]

Ok, then, this is introduced by PR #526 .

Can you call (VideoTrack)MediaPlayer.GetMedia().Tracks.First(track => track.Type == MediaTrackTypes.Video).TrackInfo and look at Width and Height?

I'd bet they are 0...

Correct, TrackInfo just contains a whole bunch of zero's.

[jeremyVignelles]

Could you make a PR to fix this? we need to check if(trackInfo.width > 0 && trackInfo.height > 0) before assigning width and height. leave the break outside the if. Test it and publish the PR.

Otherwise, I'll do that in my free time.

[jsymon]

Can confirm:

var trackInfo = (VideoTrack)track.TrackInfo;
if (trackInfo.Width == 0 || trackInfo.Height == 0)
    continue;

Fixes it. Will see if I have time to create the PR this week...

[jeremyVignelles]

I just created #531 , which should fix your issue.
Are you able to download those packages manually and install them in your project to confirm that they work for you?