How does IT ensure that SlideSync operates at its best?

SlideSync is a browser-based livestreaming platform. It integrates with any video or audio device that outputs RTMP or RTMPS or is recognized as a webcam/microphone in a browser. No additional software installation is required.

RTMP(S)-content is processed and transcoded on the SlideSync-servers and subsequently distributed globally via our CDN to attendees through browsers.

Requirements at the Production Site


Always use network cables for streaming devices. Wireless connections (WIFI / LTE) can be inconsistent, especially in areas with a large audience using wireless devices, or when interference from devices like microwave ovens and flight radars exists.

For devices used solely for managing the tool (managing questions from your attendees, changing slides, starting and stopping the event...), wireless connections are generally sufficient.

Backup Stream

SlideSync supports both a primary- and backup stream for each language. The attendee's player will switch to the backup stream if the primary stream fails. Ideally, the backup stream should use a different internet connection.

If only one connection is available, you can send both streams through it. MediaEvent Services offers secondary connections using bundled LTE/5G routers or satellite transmission from almost any location worldwide. Contact our support for more details.


For a 720p resolution, a single-channel video bitrate of 2.5 Mbit/s is used for transmitting content to SlideSync.

To prevent disruptions, exclusively use the connection for production and have twice the required bandwidth available. Considering primary and backup streams, the recommended minimum bandwidth for reliable transmission is thus 2 x 5 Mbit/s (primary and backup stream).

For 1080p transmissions, the bandwidth is about 5 Mbit/s per channel, so the minimum bandwidth is 2 x 10 Mbit/s (primary and backup stream).

Check available bandwidth in advance using online tools like


A Production with SlideSync requires network ports for HTTPS and RTMP(s) traffic (443 & 1935).

For Attendees


SlideSync selects the best possible playback quality for the livestream by default. However, to ensure good quality, each attendee should have at least 2 Mbps bandwidth. The lowest resolution (270p) only needs 300 kbps per attendee.

PLEASE NOTE: An audiocast requires just 100 kbps per attendee.

Distribution and Caching in Corporate Networks

SlideSync supports various enterprise CDN solutions for the distribution of content in corporate networks in order to reduce bandwidth consumption and prevent Internet connection overload.

Solutions include peer-to-peer technologies and appliance-based solutions (virtual and physical). Please contact our support if you are interested.

However, SlideSync can also be operated with existing caching proxies that meet the following requirements:

  • SlideSync is only delivered via HTTPS. Therefore, the caching proxy must support HTTPS caching.
  • SlideSync uses HTTP live streaming (HLS for short and also known as Apple Live Streaming). Therefore, the caching proxy must either explicitly support this protocol and/or respect the cache control headers returned by our platform (i.e. not force higher TTLs). The file extensions of the files to be cached are .m3u8 and .ts.

The following sub-domains are currently used for video content delivery:


For access, we recommend whitelisting * and directly. We recommend disabling traffic inspection / scanning at least for the video content.

PLEASE NOTE: Please do not whitelist any individual destination IPs or networks as they may change due to scalability and failover considerations.

You can use SlideSync's system test to check access.

To ensure the reception of e-mails by SlideSync, please enter the following sender addresses in the whitelist:


If Quality of Service is applied in the corporate network, review the corresponding regulations to ensure that traffic to SlideSync is handled as desired.