[Gambas-user] gb.media: No display of videos in Gambas controls

[Benoît Minisini]

Le 29/04/2019 à 19:26, Claus Dietrich a écrit :
> Hi
> 
> I am running Linux Mint 19 Mate with VirtualBox on a Windows Host with 
> all host and guest additions installed. Tests with GStreamer in a 
> terminal showed, that only /autovideosink/ works as video-sink in this 
> environment (xvimagesink or ximagesink don't work) . The working 
> GStreamer pipeline was successfully rebuilt in Gambas 3.13.0 with 
> gb.media as follows:
> 
> ' Gambas class file
> 
> Public pl As MediaPipeline
> Public dr As DrawingArea
> 
> Public Sub Form_Open()
> 
> Dim src, snk As MediaControl
> Dim ftr1, ftr2 As MediaFilter
> 
>    With dr = New DrawingArea(Me)
>      .X = 10
>      .Y = 10
>      .W = 640
>      .H = 480
>      .Background = Color.Black
>    End With
> 
>    FMain.width = dr.w + 20
> 
>    pl = New MediaPipeline
> 
>    ' 'With webcam
>    ' src = New MediaControl(pl, "v4l2src")
>    ' src["device"] = "/dev/video0"
>    ' ftr1 = New MediaFilter(pl, "jpegdec")
>    ' ftr2 = New MediaFilter(pl, 
> "video/x-raw,width=640,height=480,framerate=15/1")
>    ' snk = New MediaControl(pl, "autovideosink")
>    ' src.LinkTo(ftr1)
>    ' ftr1.Linkto(ftr2)
>    ' ftr2.LinkTo(snk)
> 
>    'With test source
>    src = New MediaControl(pl, "videotestsrc")
>    snk = New MediaControl(pl, "autovideosink")
>    src.LinkTo(snk)
> 
>    'pl.SetWindow(dr)
> 
> End
> 
> Public Sub Button1_Click()
> 
>    pl.pause
>    pl.Play()
> 
> End
> 
> Public Sub Button2_Click()
> 
>    pl.pause
>    pl.close
>    pl.stop
> 
> End
> 
> The problem: When I am trying with the above out-commented command line 
> "pl.SetWindow(dr)" to display the video in a Gambas control, Gambas 
> throws the error "Not supported on this control". Earlier examples found 
> in the Web showed, that this was working with Drawing Areas. Did this 
> function went lost? Is there anything wrong in my program?
> 
> Claus
> 

The SetWindow() method works only on elements that implement the 
GStreamer vide overlay interface. MediaPipeline does not.

Regards,

-- 
Benoît Minisini