UW-Madison Kaltura - Recommended Video Source Formats and Specifications

While Kaltura supports a wide range of video formats and codecs, there are some recommended specifications for creating source files. These settings will ensure that your source file is quickly processed, while offering the optimal video and audio quality. The lists and tables below are designed to supply you with the recommended settings you should use when compressing a video project in software as Adobe Premiere, iMovie, and others.

Recommended Video Settings

  • Source Format/Container: MP4
  • Video Codec: H.264
  • Frame Size: As big as the largest frame size - generally we recommend a 1280 x 720 frame size
  • Bitrate: 3,750-5,000 Kbps bitrate
    See Frame Size with Recommended Bitrates for other frame sizes and data rates.
  • Size: We recommend keeping the MP4 video file size below 2.0 GB.
  • Audio: AAC or MP3
Uploading videos with specifications outside of these recommendations may result in extended upload or processing times, and/or errors from Kaltura MediaSpace. Some editing and transcoding software allow you to set various export settings. In the options choose the following if available:
  • MP4 Streaming - choose Fast-Start.
  • MP4 Video Compression - choose H.264 High profile.
  • Bitrate – based on video dimensions. See table below.
  • Progressive scan mode – avoid interlaced video.
  • Multi pass –multi-pass will provide better quality. 
  • VBR vs. CBR - VBR (variable bitrate) usually provides better quality than CBR (constant bitrate).
  • Frame Rate – choose Current.

 Frame Sizes with Recommended Bitrates

 16:9  4:3  Bitrate Range
 640 x 360  640 x 480  1,350-1,800 Kbps
 1280 x 720 (720p)    3,750-5,000 Kbps
 1920 x 1080 (1080p)    6,000-8,000 Kbps

The Kaltura team generally recommends a maximum frame size of 1280 x 720. If you require your audience to discern especially fine detail in the video, then a 1920 x 1080 (1080p) frame size may be warranted.

Recommended Audio Settings

   Recommended  Avoid
 Compression  AAC, MP3  Nellymoser
 Channels  Stereo, Mono  Surround - 5.1, 7.1
 Sample Size  44.1 kHz or lower  
 Sound Levels  Normalized  Peaks, low sound




Keywords:kaltura, UW-Madison, h264, mp4, video, format, spec, specification, maximum, max, file, size   Doc ID:47264
Owner:Dan L.Group:UW-Madison Kaltura
Created:2015-02-17 11:15 CDTUpdated:2016-05-06 15:15 CDT
Sites:DoIT Help Desk, Learn@UW Madison, UW-Madison Kaltura
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