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
|| 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
|| AAC, MP3
|| Stereo, Mono
|| Surround - 5.1, 7.1
| Sample Size
|| 44.1 kHz or lower
| Sound Levels
|| Peaks, low sound