Manual conversion ¶įor optimal control of the compression options, users should perform the conversionĪnd compression steps before uploading their videos to Kolibri Studio. When creating VideoFile object, and specify these options: crf, max_height, and max_width. To overwrite these defaults, chef authors can pass the argument ffmpeg_settings (dict), Scale the video to max-height of 480 pixelsĬompress the video with CRF of 32 (constant rate factor) Has the following transformations applied to it:
This command takes the inputfile.mp4 and outputs the file outputfile.mp4 that profile : v baseline - level 3.0 - preset slow - v error - strict - 2 - stats \ The command line will use the following default settings: Video files before uploading them to Kolibri Studio. Under the hood, the ffmpeg video conversion program will be called to compress The -compress command line argument to the chef script, e.g. The ricecooker library can handle the video compression for you if you specify Let’s now look at compression tools that you can use to ensure a good videoĮxperience for all Kolibri users, regardless of their device. Required for the entire collection of videos? Think of the learners and the device they will be using to view the videos.Ĭonsider also the overall size of the channel- how much storage space will be Using video compression and low resolutions is important for the context of use. Use max height of 720 for high resolution videos (lectures with writing on board) Use max height of 480 for videos that work well in low resolution (most videos) Here are some recommended choices for video vertical resolution: High-resolution videos should be converted to lower resolution formats: Longer video lectures (1 hour long) should not be larger than 200MB Short videos (5-10 mins long) should be roughly less than 15MB x264) video codec to ensure video will play in web browsers Size of the video resources that will be imported.īelow are some general guidelines for importing video files:
Importing video files into Kolibri requires special considerations about the file
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