DigitalChalk
will deliver the video that you upload via streaming media over the
student's internet connection. Since the internet is our key method of
delivery we must concern ourselves with each students available
bandwidth. In order to achieve optimum video performance we recommend
use of the following guidelines when exporting or saving your finalized
video file;
using the Small Video chalkboard template
Optimum Video Screen Size = 4:3 aspect ratio (640x480 recommended) or (360x270 minimum)
Optimum Video Compression = 29-30 frames per second
Optimum Video Streaming Rate = 400 Kb per second
using the Large Video chalkboard template
Optimum Video Screen Size = 4:3 aspect ratio (640x480)
Optimum Video Compression = 29-30 frames per second
Optimum Video Streaming Rate = 800 Kb per second
using the Video Only chalkboard template
Optimum Video Screen size = 16x9 aspect ratio (1006x566)
Optimum Video Compression = 29-30 frames per second
Optimum Video Streaming Rate = 2.5Mb per second
for full screen video using HD Learn Technology
Optimum Video Screen Size = 16:9 aspect ratio (1280x720) or 4:3 aspect ratio (1280x960)
Optimum Video Compression = 29-30 frames per second
Optimum Video Streaming Rate = 2.2 Mb per second
The maximum file size supported for upload is 1GB (or 500MB for Legacy accounts). The duration of the media clip should not exceed 60 minutes.
DigitalChalk
currently supports the following video formats; .3GP, .AVI, .DIVX, .DV,
.FLV, .MOV, .M4V, .MP4, .MPEG, .MPG, and .WMV video files. If you have the ability to choose a specific file type and codec we recommend using the MP4 file type with an H.264 codec.