C＃MP4文件.mp4元数据标签读取写入编辑(示例代码)

Metadata pMD = MP4File.ReadMetadata(xVideoAddress.Text);
xTitle.Text = pMD.Title;
xArtist.Text = pMD.Artist;
xComment.Text = pMD.Comment;

if (pMD == null) {
    MessageBox.Show("请先读取");
    return;
}
if (!string.IsNullOrWhiteSpace(xTitle.Text)) {
    pMD.Title = xTitle.Text;
}
if (!string.IsNullOrWhiteSpace(xArtist.Text)) {
    pMD.Artist = xArtist.Text;
}
if (!string.IsNullOrWhiteSpace(xComment.Text)) {
    pMD.Comment = xComment.Text;
}
MP4File.WriteMetadata(xVideoAddress.Text, null, pMD);