As an alternative to recording audio over the phone, you can upload a pre-recorded media file of your presenters. Presenter Media can be a video (.mp4 at 1 Mbps) or an audio (.wav at 128 kbps) file.
Once the media file is uploaded, you will need to set your slide timings accordingly.
Click here to learn how to upload your Presenter Media file and set your slide timings.
Note: Presenter Media is only available for Simu-live, Sim-2-live, and On-Demand presentations.
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Pro Tip: When recording and encoding videos for your streaming experiences, ON24 recommends choosing software that not only meets your current needs but can also grow with your ambitions. While some applications (like Powerpoint or freeware) might allow recording and exporting to MP4 and may seem convenient or cost-effective, they typically lack the reliability, features, and support required for professional live streaming. Using professional video recording and editing tools not only enhances your viewer's experience but also supports your brand's reputation as a professional content creator. Don't have professional video software? Don't worry! Let our ON24 Production pros do it for you. |
Video Clips vs. Presenter Media
| Video Clips | Presenter Media |
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Added to the Storyboard of the webcast - used in combination with other elements such as PowerPoints and polls. Find more information on adding video clips to your Storyboard here. |
Recordings of ENTIRE presentations Note: Presenter Media files must be encoded with a Constant Bit Rate (CBR). If Variable Bit Rate encoding is used, it may generate lip-sync issues when the files are played back during the event. |
| Supported for all webcast present types |
Can be either audio or video files Note: When using video Presenter Media files, uncheck the Auto expand option when configuring the Media player to ensure the audience can use all the tools you build. |
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Generally shorter clips Find Video Clip Specifications here. |
Used for Simu-live or On-Demand webcasts. Find Presenter Media specifications below. |
Audio File Specifications
If you wish to use a pre-recorded audio file, upload a .wav file and use the interface in the Presentation View window to set the timings for the storyboard elements. The best practice is to upload a 16-bit mono .wav file.
| Specifications | Notes and Best Practices |
| Maximum File Size | 2 GB |
| Audio Format | PCM Unsigned |
| Audio Sample Rate | 8kHz |
| Audio Sample Size | 16 bit |
| Bit Rate | 128 Kbps - A constant bitrate is required |
| Channels | 1 (mono) |
Video File Specifications
Note: All Video (MP4) must have Audio and Video streams encoded (even if audio is silent).
| 720p Streaming | 1080p Streaming | Additional Notes | |
| Default Account Setup |
Requires Account Configuration Change
Please contact Support with any questions |
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| File | MP4 (.mp4) | MP4 (.mp4) | |
| Size | 2 GB or lower | 2 GB or lower | |
| Video Format | H.264 / AVC VP6 |
H.264 / AVC VP6 |
These codecs are absolute necessities. MPEG4-Visual codec is not supported. |
| Audio Format | AAC MP3 |
AAC MP3 |
AAC audio format is preferred if using H.264. With MP3 the mobile stream may encounter issues. |
| Sample Rate | 48 kHz | 48 kHz | |
| Audio | 64 kbps mono | 96 kbps mono (recommended) |
32 kbps audio is sufficient and will allow the video to be encoded at a higher bit rate. 64 kbps is standard. 96 kbps is recommended for 1080p. Anything over 96 kbps for the mono audio stream is superfluous unless the audio was recorded in a studio (16 kbps is the approximate audible top-end of a traditional copper telephone connection). |
| Frame Size |
The video clip must be a 16:9 (recommended) or 4:3 aspect ratio. We recommend 1280 x 720 pixels/720p (or smaller) to minimize file size and bandwidth issues. |
The video clip must be a 16:9 aspect ratio. We recommend 1920 x 1080 pixels/1080p (or smaller) to minimize file size and bandwidth issues. |
If the video clip is to be displayed in the slide area, the frame size should match the size of the slide area in the audience console. |
| Bitrate |
2 Mbps / 2000 kbps Add both the audio and the video channels to get the total bitrate. Generally speaking, the higher the bitrate, the higher the bandwidth requirement for the audience. Important: A CONSTANT bitrate is required. |
5 Mbps / 5000 kbps Add both the audio and the video channels to get the total bitrate. Generally speaking, the higher the bitrate, the higher the bandwidth requirement for the audience. Important: A CONSTANT bitrate is required. |
Bitrate refers to the number of bits per second (bps) at which data in a video is being delivered. The size of the file and the quality of the image and sound are both controlled by the bitrate used. The higher the bitrate, the better the potential quality, and the larger the file size. Lower bitrates should be used for international audiences or events with a large number of users on the same network that is generally more susceptible to bandwidth limitations. |
| Frame Rate |
30 fps or less |
30 fps or less |
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| Keyframe |
1 keyframe every 3 seconds |
1 keyframe every 3 seconds |
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| Resolution |
1280 x 720 (720p) |
1920 x 1080 (1080p) |
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