Content Authoring with MP4Box

本文介绍使用MP4Box为MPEG-4文件添加Hint的过程及官方文档中的一些基本概念。
今天用mp4box给mpeg-4文件做hint的时候看到了这篇官方的doc,感觉把很多基本概念讲得很清晰。1485771.aspx
As described in Restrict Access at the Data Row Level, this approach requires the database to contain the field you want to use for filtering. For this example, the data includes a reference table called People, which contains two columns: Region and Manager. Names in the Manager field match Tableau Cloud or Tableau Server user names, and we’ll use this field for filtering. You can follow along using the Superstore data that comes with Tableau Desktop, although the fields and values do not match exactly. Connect to the data and set up the user filter In Tableau Desktop, open the workbook and connect to the data you want to filter. In this example, we use a table called Orders. Double click the Orders table to open the join canvas. Add the reference table (People) with a left join. For this example, join on the field Region. On the worksheet, select Analysis > Create Calculated Field, and create the following field, named "User is a manager". USERNAME() = [Manager] This calculation returns TRUE if the user name of the person signed in to the server exists in the manager column of the People table. Add the User is a manager field to the Filters shelf. In the Filter dialog box, select True, and then click OK. This sets the filter so that only people who are managers can see the data in the view. If you are not listed in the Manager field, your view while authoring might appear as a blank canvas. See how the view looks to a particular person: in the lower-right, open the Filter as User menu, and select someone you know is a manager. Important: As with a manual user filter, you need to take steps to Secure user filters on published content. Filter a data source Rather than maintain user filters and special permissions on each published workbook, you can filter a data source, and then publish the data source to make it available as a shared, one-to-many resource for anyone who uses that data. This procedure builds from the dynamic-filter approach described in th
03-26
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