Tech Tidbits
Captioning for the iPad
More than 2 million iPads have been sold in the first two months since they were released, bringing a new market to life on very short order. So how do you caption video for the iPad? As it shares the same iOS base operating system as the iPhone and iPod Touch captioning for iPad is essentially the same process as it is for the iPhone and iPod Touch.
There are two mechanisms to display timed text information on the iPad/iPhone/iPod Touch; closed captions and subtitles. The closed captions are constrained as line-21 closed captions on standard definition broadcast television -- 32 characters per line, 2 lines per caption, no control over font, limited character set, and bandwidth constrained with respect to how fast the captions can display. Subtitles on the other hand are much more flexible with respect to font, line length, character set, and display rate. Your video can contain either one or both captions and subtitles. Given a choice, subtitles are probably the better way to go. Of course, CaptionSync can produce output files for either.
Captions are turned on or off in the main Settings application in the Video section (unlike the iPhone/iPad Touch where it's under the iPod section). Subtitles on the other hand can be turned on or off directly when playing the video by pressing the subtitle menu next to the Play button when the video starts (or when you tap the video when it is playing).
Industry standard SCC files contain the caption information which needs to be added into the video file. These SCC files can be added to video via QuickTime Pro and the ClosedCaptionImporter plugin (Mac only). The ClosedCaptionImporter plugin can be found at http://developer.apple.com/mac/library/samplecode/ClosedCaptionImporter/Introduction/Intro.html. They can also be added to video using Compressor 3 (part of the Final Cut Studio). You can visit www.automaticsync.com/help to see how-to tutorials on either method.
There are a number of different files which store subtitle information and the particular file needed depends upon the package used to encode the video. The 3GP.XML file works for packages such as Podcast Producer and MP4Box. The SRT file works for packages such as iSubtitle and Muxo.
With almost 100 million iPads, iPhones, and iPod Touches sold to date, this is a large installed base worthy of your consideration for accessibility.
Final Cut Pro DV with SCC Files
If you're producing for broadcast and haven't been able to use our Digital NLE Caption post-processing (which requires the full D1 720x486) because you've been writing to DVCAM, DVCPRO or MiniDV (which is 720x480), we have some good news for you -- if you're using Final Cut Pro 7.
Apple's Final Cut Pro 7 now allows you to directly insert .SCC file caption data at Print to Tape time without the added cost and workflow of overlaying Digital NLE Caption movies. This only works when you go out via FireWire however.
Here are the steps you need to take:
- Log into your CaptionSync account
- Select Sonic Scenarist DVD Captions (.scc, .ndf.scc) along with whatever other captions you need in Output Types tab of Advanced Settings
- In Broadcast tab of Advanced Settings set the offset to 00:00:00:00 (even if the timeline in FCP starts at 01:00:00:00)
- In FCP7 under File choose Print to Video or Edit toTape
- In the pop-up window that appears choose Insert closed captioning data from file checkbox
- Then below the checkbox select the SCC file you received from CaptionSync (you will need select Sonic Scenarist Captioning Files under Show)
- Then click the OK button to print to tape
If you have bars and tone at the beginning of your sequence that was not in the audio CaptionSync synchronized with, you need adjust your offset by the duration of those (e.g. 00:00:01:00)
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