Examples
Your contribution up front
Make sure your video highlights your contribution/s. You can show your contribution right at the beginning, at the same time than your title shot:
Structure
A good structure can help you make the most of your 30 seconds. In this example, authors start with the problem, show their solution, and end with their evaluation.
Uses cases
You may want to showcase many examples of what your system can do.
Self-explanatory videos (no voice over)
If you don't want to do a voice over, you don't have to! Videos can be self explanatory if they include great illustrations of your system:
You can also add short text annotations to explain your video. You can place text annotations at the bottom, or next to the object they are describing. Also, think of visibility and contrast, to make your text annotations more readable.
Adding Closed Captions (CC)
If you add a voice over to your video, we highly recommend to add Closed Captions (CC). Adding CC to your video preview is not difficult; and many people in our community will benefit from your efforts.
The only prerequisite you need is ffmpeg. It supports the process of adding CC—provided as a SubRip Subtitle (SRT) file—to your video. The SRT file is basically a text file containing a numeric counter or sequence number to identify the caption order, time codes when the caption should appear and respectively disappear, and the caption texts.
<numeric counter> <time codes> <time codes> |
1 00:00:04,000 --> 00:00:08,868 Caption text. |
The following example shows three captions with the numeric counter, the time codes when the captions appear and the time codes when they disappears, and finally the caption texts.
1 00:00:04,000 --> 00:00:08,868 This is a closed captioning (CC) making your 30-second video preview a great UIST video, which is... 2 00:00:09,500 --> 00:00:10,730 accessible... 3 00:00:10,000 --> 00:00:14,216 to EVERYONE. Enjoy!
You can also check out this tutorial on how to produce your captions file with Youtube: step-by-step captioning tutorial, and then download your captions as a .SRT file. Next, put the captions in a file called
infile.srt. Then use the following command line to add the captions to your
infile.mp4. You can even add captions in multiple languages using different SRT files and changing the ffmpeg language option.
$> ffmpeg -i infile.mp4 -i infile.srt -c copy -c:s mov_text -metadata:s:s:0 language=eng outfile.mp4
