This is one of many help and support pages that are available about the University of Nottingham's Moodle online learning environment. If you have any questions or queries concerning Moodle then contact information is at the bottom of this page. As a first step to finding the information you are looking for why not check out our FAQ - Your questions answered or try the SEARCH box below.
Video files can be too large to upload, when this happens one solution is to create a new smaller version by converting the video from one 'encoding profile' to another aka 'transcoding'.
If your video file is too big then you may experience issues with slow upload, exceeding allowable upload size, or stuttering during playback.
Often video comes out of the recording device or editing software in a large file size, and it is compressed to meet the delivery requirements for playback.
Moodle does not have rigid delivery requirements, however you are restricted by your internet connection, and the viewers computer system.
In this situation it is wise to use a format that is widely compatible e.g. MP4 rather than something restricted e.g. WMV, and to deliver a moderate file size.
There are many software tools for this including Adobe Media Encoder, Apple Compressor, and FFMPEG, but this guide will use Handbrake as an example because it is free, straightforward, actively developed, and available on both OSX and Windows.
Video File Compression is for final delivery only, do not do this for your source media.
If you are experience stuttering video during editing seek alternative solutions, such as changing video playback quality, video proxy settings, using a separate scratch disk, or a faster computer.
For specific video advice and support contact is-learning-team@nottingham.ac.uk
Video file sizes are a function of duration x data rate. Assuming the duration is fixed you need to reduce the data rate. This is achieved by transcoding the original video file to create a new one.
Data rate is often expressed in megabits aka Mb (lowercase b) and file size is often expressed in megabytes aka MB (uppercase b). There are 8 bits to a byte.
A typical camera data rate could be 15 Mbps, which would be:
30 seconds x 15 Mbps = 450 Mb = ~56 MB
The data rate from motion graphics software or a different camera could be much higher such as 200 Mbps, which would be:
30 seconds x 200 Mbps = 6000 Mb = 750 MB
You may wish to compress either of these to a data rate of 4 Mbps, which would be:
30 seconds x 4 Mbps = 120 Mb = 15 MB
Needless to say, there are significant differences between 15, 56, and 750.
Handbrake on Windows:
Handbrake on OSX:
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If you have any comments on how you think this help can be improved then please email Learning-Technologies@nottingham.ac.uk
