FFmpeg给视频添加图片，文字（vb.net，类库——11）

给视频添加文字，可以使用添加文字的方法，但是想添加中文字，那只能使用微软雅黑了

那我们想：文字可以被印到图片上，然后图片可以被轻而易举的添加到视频中

借助GDI+完成这一转换

Public Function AddText(s As String, input As String, location As Point, font As Font, c As Color, out As String)
        Dim pic = New PictureBox
        Dim g As Graphics = pic.CreateGraphics()
        Dim sf As New StringFormat
        g.DrawString(s, font, New SolidBrush(c), 0, 0, sf)
        Dim stringSize As SizeF = g.MeasureString(s, font, 1000, sf)
        Dim bmp As New Bitmap(CInt(stringSize.Width), CInt(stringSize.Height))
        Dim gb As Graphics
        gb = Graphics.FromImage(bmp)
        gb.DrawString(s, font,New SolidBrush(c),location)
        bmp.Save(Application.StartupPath & "\tmp.png", Imaging.ImageFormat.Png)
        SharedP(ffmpeg, "-i " & input & " -i " & Application.StartupPath & "\tmp.png -filter_complex " & Chr(34) & "overlay=" & location.X & ":" & location.Y & Chr(34) & " -y " & out, True)
        Return vbNull

    End Function

    Public Shared Function SharedP(s As String, Arguments As String, nowindow As Boolean)
        Dim p As New Process
        p.StartInfo.FileName = s
        p.StartInfo.Arguments = Arguments
        p.StartInfo.UseShellExecute = False
        p.StartInfo.RedirectStandardError = True
        p.StartInfo.CreateNoWindow = nowindow
        p.Start()
        p.StandardError.ReadToEnd()
        Return p.StandardError.ReadToEnd()
        p.WaitForExit()
        p.Kill()
        p.Close()
        p.Dispose()
    End Function

 调用：

GDIvid.AddText("HOOOOOOO", "C:\Users\Administrator\Desktop\feca881102ec9c42603125354dbe7d19.mp4", New Point(0, 0), New Font("宋体", 50, FontStyle.Bold), Color.Blue, "C:\Users\Administrator\Desktop\test.mp4")

讲解：(s As String, input As String, location As Point, font As Font, c As Color, out As String)

s：是添加的文字

input是视频的输入路径

location是文字在视频中的位置，不要和代码中“g.DrawString(s, font, New SolidBrush(c), 0, 0, sf)”搞混

font：千万注意！参数要全（New Font("宋体", 50, FontStyle.Bold)）

font也可以使用未安装的字体格式，具体装载请见vb.net大佬的文章：vb.net 教程 5-3 使用未安装的字体

 color 和 out 不需要我讲了……（其实这很容易理解）

 效果：