Formt String is not working when recording with sout

Summary

I'm not able to use forma string in the sout dest file name

Minimal project and steps to reproduce

        // Load native libvlc library
        Core.Initialize();

        using (var libvlc = new LibVLC())
        using (var mediaPlayer = new MediaPlayer(libvlc))
        {
            libvlc.SetLogFile("logs.txt");
            // Redirect log output to the console
            //libvlc.Log += (sender, e) => Console.WriteLine($"[{e.Level}] {e.Module}:{e.Message}");

            // Create new media with HLS link
            var media = new Media(libvlc, "https://www.radiantmediaplayer.com/media/bbb-360p.mp4", FromType.FromLocation);

            // Define stream output options. 
            // In this case stream to a file with the given path and play locally the stream while streaming it.
            //  media.AddOption(":sout=#transcode{vcodec=h264,acodec=mpga,scale=1}:file{dst=\"" + destination + "\"}"); 
            media.AddOption(":sout=#transcode{vcodec=h264,acodec=mpga,scale=1}:file{dst=\"record-%Y-%m-%d.mp4\"}");
            media.AddOption(":sout-file-format");
            media.AddOption(":sout-keep");
            media.AddOption(":no-sout-display");
            media.AddOption(":run-time=2");

            // Start recording
            mediaPlayer.Play(media);

            Console.WriteLine($"Recording in {destination}");
            Console.WriteLine("Press any key to exit");
            Console.ReadKey();
            libvlc.CloseLogFile();
        }

    }

What is the current bug behavior?

The file is recorded with this filename record-%Y-%m-%d.mp4

What is the expected correct behavior?

The file is recorded with this filename record-2019-08-10.mp4

Relevant logs and/or screenshots

[Debug] main:VLC media player - 3.0.7.1 Vetinari [Debug] main:Copyright © 1996-2019 the VideoLAN team [Debug] main:revision 3.0.7.1-0-gf3940db4af [Debug] main:configured with ../extras/package/win32/../../../configure '--enable-update-check' '--enable-lua' '--enable-faad' '--enable-flac' '--enable-theora' '--enable-avcodec' '--enable-merge-ffmpeg' '--enable-dca' '--enable-mpc' '--enable-libass' '--enable-schroedinger' '--enable-realrtsp' '--enable-live555' '--enable-dvdread' '--enable-shout' '--enable-goom' '--enable-caca' '--enable-qt' '--enable-skins2' '--enable-sse' '--enable-mmx' '--enable-libcddb' '--enable-zvbi' '--disable-telx' '--enable-nls' '--host=x86_64-w64-mingw32' '--with-breakpad=https://win.crashes.videolan.org' 'host_alias=x86_64-w64-mingw32' 'PKG_CONFIG_LIBDIR=/home/jenkins/workspace/vlc-release/windows/vlc-release-win32-x64/contrib/x86_64-w64-mingw32/lib/pkgconfig' [Debug] main:Creating an input for 'bbb-360p.mp4' [Debug] main:using sout chain=transcode{vcodec=h264,acodec=mpga,scale=1}:file{dst="record-%Y-%m-%d.mp4"}' [Debug] main:stream=file' [Debug] main:looking for sout stream module matching "file": zd candidates [Debug] main:set config option: sout-standard-dst to record-%Y-%m-%d.mp4 [Debug] main:looking for sout access module matching "file": zd candidates [Debug] file:file access output opened (record-%Y-%m-%d.mp4) [Debug] main:using sout access module "file" [Debug] mp4:Mp4 muxer opened [Debug] main:using sout mux module "mp4" [Debug] stream_out_standard:using file/mp4://record-%Y-%m-%d.mp4' [Debug] main:stream=transcode' [Debug] main:looking for sout stream module matching "transcode": zd candidates [Debug] main:looking for sout mux module matching "mp4": zd candidates [Debug] main:set config option: sout-transcode-acodec to mpga [Debug] main:set config option: sout-transcode-scale to 1

Environment

• OS: Windows
• Version 10
• Device: PC
• LibVLC version and architecture 3.0.7.1, x64
• LibVLCSharp version 3.1.1 .Net Core

Possible fixes

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