Please ensure your video follows all of the following guidelines before uploading.
Videos can be in only one format: MP4 video 1920x1080p@30fps in H264 compression. (We will also accept 29.97 and 25 FPS given their common usage and they work with our display tools). This will enable us to play all talks from our laptops for presentations and load them into the online system for remote presentations. Videos that do not fit this resolution /formatting will be discarded, and the associated paper will be pulled from the proceedings. All videos MUST have narration, or they will be disregarded, and paper pulled. If you are presenting in person, we just turn off the sound, and you present with the video instead of slides. You can practice getting your presentation timing to match the video. You may get someone else to do your voice-over. Human narration is preferred, but text-to-speech (TTS), is allowed if it makes the video easier to understand. There are some bad TTS and some better ones. If your narration is bad, people are more likely to skip your video.
When presenting, introduce yourself. There will be no time allotted for “questions” during the video session. As usual, any projected Text/Math should use at least 24-point font (and ideally should be >32pt) as smaller fonts will not be readable on small mobile screens.
Video/Slide Presentation Formatting
Talk slides need to be converted to video.
The video should be no more than the allotted time. It should start with a title slide. The video MUST be named as in the upload page and should be a Mpeg4 with 1920×1080 resolution, 30 frames-per-second, with H264 encoding. (We will accept 29.97 and 25 FPS given their common usage and they work with our display tools). H264 is the default codec for many MP4 encoders, but not all). The file should NOT be an AVI file or a MOV but a proper MP4 — and you cannot just rename it to convert it). You must record a narration. You are free to use picture-in-a-picture if you want the slides to show you. (e.g. you do a zoom or teams call and record the slides and yourself)
You might use Youtube or FFMPEG to convert formats.
If you prepare your presentation using PowerPoint, you can time your slides and save the presentation as a WMV video directly from PowerPoint but must then convert to MP4, e.g. via Youtube or FFMPEG.
Alternatively, many free screen capture programs directly produce proper MP4:
- On Windows, you can use Windows Key + Alt + R to record the screen and audio as you present. A second screen will let you use presenter mode notes.
- For Mac there is the built-in QuickTime to record screen+ audio, which will need to be exported as MP4 because the QuickTime default is MOV).
- For Mac users using keynote, you can do Play > Record Slideshow…, then record it. This seems just to record timestamps. But then you do File > Export to Movie, select “Slideshow Recording”, Custom resolution (1920×1080). This puts a H264-encoded video in an m4v, which can be turned into an mp4 with ffmpeg as below
Some platform independent tools:
- VLC- (http://www.videolan.org/vlc/index.html)which works on all platforms.
- OBS- https://obsproject.com/
- Tinytake- (http://tinytake.com/) for Windows.
If you have an mp4 file after your encoding, you can upload that directly. If you only have video recorders producing other formats, e.g. avi or wmf , Youtube may be able to convert for you (upload then download) which is preferred. Or you may convert using FFMPEG ( https://ffmpeg.org/
- ffmpeg -i source_video.avi -acodec aac -c:v libx264 -crf 16 -s 1920×1080 -t 4:00 -preset slow -s 1920×1080 outputfilename.mp4
- where the outputfilename follows the FILE NAMING RULES for upload
- One can even use FFMPEG to create a video from slides, but screen recording is far easier.
- If using FFMPEG or other tools, please ensure the frame rate is 30fps.
After uploading, you will receive an email. If you upload a second time, it will simply overwrite your original file, so if you want to update the file, just upload it a second time.
If you do not see an email after your submission, check your SPAM folder.