How can I display the thumbnail of a video file in a Picturebox?

[dilettante]

Example:

Option Explicit

'Here we assume that Label2.Width and Picture1.Width are both equal to Form.ScaleWidth.
'We also assume that Picture1.Height is the maximum height we are after.

'Hard-coded test value:
Private Const VIDEO_FILE As String = "D:\DREAM - My Will Live.mp4"

Private Declare Function IStream_Read Lib "shlwapi" ( _
    ByVal Stream As stdole.IUnknown, _
    ByRef v As Byte, _
    ByVal cb As Long) As Long 'HRESULT

Private Declare Function IStream_Size Lib "shlwapi" ( _
    ByVal Stream As stdole.IUnknown, _
    ByRef ui As Currency) As Long 'HRESULT

Private ImageFile As WIA.ImageFile
Private ImageProcess As WIA.ImageProcess
Private BordersWidth As Single 'ScaleMode.
Private BordersHeight As Single 'ScaleMode.

Private Sub Form_Load()
    Const ssfDESKTOP = 0
    Dim Stream As stdole.IUnknown
    Dim ui As Currency
    Dim Bytes() As Byte

    Label2.Caption = VIDEO_FILE
    With CreateObject("Shell.Application").NameSpace(ssfDESKTOP).ParseName(VIDEO_FILE)
        Set Stream = .ExtendedProperty("System.ThumbnailStream")
    End With
    IStream_Size Stream, ui
    ReDim Bytes(0 To CLng(ui * 10000@) - 1)
    IStream_Read Stream, Bytes(0), CLng(ui * 10000@)
    With New WIA.Vector
        .BinaryData = Bytes
        Set ImageFile = .ImageFile
    End With
    Set ImageProcess = New WIA.ImageProcess
    With ImageProcess
        .Filters.Add .FilterInfos.Item("Scale").FilterID
        With .Filters(1).Properties
            .Item("PreserveAspectRatio").Value = True
            .Item("MaximumWidth").Value = _
                Picture1.ScaleX(Picture1.ScaleWidth, Picture1.ScaleMode, vbPixels)
            .Item("MaximumHeight").Value = _
                Picture1.ScaleY(Picture1.ScaleHeight, Picture1.ScaleMode, vbPixels)
        End With
    End With
    With Picture1
        BordersWidth = .Width - .ScaleWidth
        BordersHeight = .Height - .ScaleHeight
    End With
End Sub

Private Sub Form_Resize()
    Dim Picture As stdole.StdPicture
    Dim NewWidth As Single
    Dim NewHeight As Single

    If WindowState <> vbMinimized Then
        With ImageProcess.Apply(ImageFile)
            Set Picture = .FileData.Picture
            NewWidth = ScaleX(.Width, vbPixels, ScaleMode) + BordersWidth
            NewHeight = ScaleY(.Height, vbPixels, ScaleMode) + BordersHeight
        End With
        With Picture1
            .Move (ScaleWidth - NewWidth) / 2, Label2.Top + Label2.Height, NewWidth, NewHeight
            .AutoRedraw = True
            .Cls
            .PaintPicture Picture, 0, 0
            .AutoRedraw = False
        End With
    End If
End Sub

This one doesn't support resizing Form1 because it caches the max width and height during Form_Load.