vba - 在 vba 中使用 ffmpeg 更改视频格式

Question

我想更改演示文稿中显示的嵌入视频的视频格式。我使用以下代码将视频文件导出到另一个文件夹:

        Dim Finame As Variant
        Dim oApp As Object
        Dim StoreFolder As Variant
        Dim Videoname As Variant
        Dim FileNameFolder As Variant

        MkDir "C:\template\videoZip"

        Set oApp = CreateObject("Shell.Application")
        FileNameFolder = "C:\template\videoZip\"
        Finame = ActivePresentation.Path & "\" & ActivePresentation.Name
        StoreFolder = "C:\template\created_files\"
        oApp.Namespace("C:\template\videoZip\").CopyHere Finame
        Name "C:\template\videoZip\" & ActivePresentation.Name As "C:\template\videoZip\" & ActivePresentation.Name & ".zip"


        oApp.Namespace(FileNameFolder).CopyHere oApp.Namespace("C:\template\videoZip\" & ActivePresentation.Name & ".zip").items

        Dim firstCount As Integer
        Dim lastCount As Integer

        For j = 1 To videoNum
            firstCount = oApp.Namespace(StoreFolder).items.count
            Videoname = "C:\template\videoZip\ppt\media\media" & j & ".mp4"
            oApp.Namespace(StoreFolder).CopyHere Videoname
            lastCount = oApp.Namespace(StoreFolder).items.count
            If firstCount = lastCount Then
                MsgBox "The video has problems loading and it will not be shown (Only mp4 supported)"
            End If
        Next j

        Set objFSO = CreateObject("Scripting.FileSystemObject")
        objFSO.deletefolder "C:\template\videoZip"
    End If

正如我所说，通过这种和平的代码，我可以获得演示文稿中的所有视频。现在我想改变它们的格式。我听说可以使用 ffmpeg。也欢迎其他更改格式的解决方案。

Answer 1

至少在 Linux 上，转换视频文件的语法是

ffmpeg -i media1.mp4 media1.avi

然后你有很多选项来处理大小、编解码器、修剪等。参见 ffmpeg documentation为了那个原因。

有一个 thread on SO关于执行 shell 命令并等待它们返回。

Dim wsh As Object
Set wsh = VBA.CreateObject("WScript.Shell")
Dim waitOnReturn As Boolean: waitOnReturn = True
Dim windowStyle As Integer: windowStyle = 1
Dim errorCode As Integer
wsh.Run("C:\pathto\ffmpeg.exe -i media1.mp4 media1.avi", windowStyle, waitOnReturn)