The .QT.XML file is the format recommended for the QuickTime player. There are several mechanisms to associate captions with your file:
4. Subtitle or Open Caption your media file using our Video Encoding service: we can encode your media file (.mov, .m4v, .f4v, or .mp4) with subtitles or open captions. You just need to request Video Encoding for your video, and choose Open Captions or Subtitles as the Encoding option.
Note for Windows users: the QuickTime player on Windows requires subtitled outputs to have the .m4v extension. So, to watch encoded videos with subtitles on QuickTime, you need to change the extension of the file, e.g., Bio_1.mp4 -> Bio_1.m4v .
5. Associate an .SCC file with your media file in Compressor 4. Note that while the .SCC is widely supported in the QuickTime browser plugin and on iPod/iPhone/iPad, control of how the captions look and how they appear is very limited.
7. Associate a .3GP.XML subtitle file with your media file using Podcast Producer or MP4Box.
NOTE FOR MAC USERS:
QuickTime Player 7 on the Mac still supports .QT.TXT and .QT.SMIL caption files. So you can use the .QT.TXT file with one of the first 3 methods described above. You should get the same results.
You can also use the .QT.SMIL file, which is a pointer file (pronounced “smile” file), to simply associate captions with your media file, as described below. The .QT.SMIL file may also be used to specify full URLs to streaming media servers and web servers. Using the .QT.SMIL file is probably the least robust option since the SMIL MIME type is often fought over by RealPlayer, Windows Media Player, and QuickTime, so there are challenges to ensure it works for all people visiting your video. Furthermore, getting the URL information within .QT.SMIL correct may require troubleshooting with the personnel who configure your streaming media server.
Associate captions using the .QT.TXT and .QT.SMIL files:
Place the .qt.smil and .qt.txt caption files in the same directory as your media file. To ensure the .qt.smil file makes reference to the correct .qt.txt and media files, open the .qt.smil file with a text editor (TextEdit, for example). For example, if you have a media file named Movie_Sample.mov, and a .qt.txt caption file named Movie_Caption.qt.txt, the following section in the .qt.smil file needs to make reference to the correct names of these files:
<video region="videoregion" src="Movie_Sample.mov"/>
<textstream region="textregion" src="Movie_Caption.qt.txt"/>
<!-- Created by CaptionSync from Automatic Sync Technologies www.automaticsync.com -->
If the file names in the .qt.smil don't match the names of your media and .qt.txt files, please change them accordingly in the section illustrated above, and save the file again as .qt.smil.
Then you just need to right-click the .qt.smil file, select the Open With option, and choose QuickTime Player. The media and caption files will be opened and displayed at the same time.