In the following you will find basic technical information on uploading the video files as well as on the formats of the videos that you can offer on the Internet. (download pdf)
Specifications of the video file for upload
The development in the field of video technology is rapidly changing and specifications or values are changing accordingly. We currently recommend the following basic values for uploading:
Basic resolution: FullHD 1080p (1920 x 1080, 16: 9) or comparable
Container / Codec: MP4 / H264 / 7-11 Mbps
Sound: AAC Stereo / 192 Kbps
Caption / Subtitle: WebVTT
A variety of upload formats are possible (3gp | avi | divx | flv | mov | mpe | mpeg | mpg | mp4 | vob | wmv | xvid). It is also possible to work with bit rates in combination with other sound parameters. The recommendations mentioned above are based on experience with efficiency and process reliability during operational business.
We strongly advise against uncompressed formats such as ProRES and the like, because this creates file sizes that make an upload to the server extremely difficult!
WebVTT (Web Video Text Tracks) is the W3C's standard for displaying timed text in conjunction with the HTML5 element. It is largely based on the SRT format and develops it further. There are a number of free tools on the net for transferring SRT files (online and offline).
Converter SRT 2 VTT
There are currently two formats available for creating videos.
WebVideo (Progressive Download)
Via progressive download, the WebVideo offers a good basic format for fast, uncomplicated provision of trailers, clips and smaller videos.
The perception for the end user is similar to that of streaming media. When a digital media file is embedded in a web page, it is downloaded to the device's memory by the end user. The digital media file is typically either saved in the temporary directory of the web browser involved or redirected to a directory that is specified in the settings of the media player for playback. The playback of the digital media file will jerk or even stop if the data rate for playback exceeds the data rate for downloading. If enough data has been downloaded again, the file will continue to play.
Adaptive Stream (Dynamic Adaptive Streaming over HTTP)
Offers optimized video delivery for different devices and bandwidths. There is a better protection against direct download of the video file via browser.
-> This format takes significantly longer to create
Similar to Apple's solution, HTTP Live Streaming (HLS), MPEG-DASH works by breaking down the content into a sequence of small HTTP-based file segments, with each segment containing a short section of the total playing time of a media object, potentially several hours in duration - for example a film or the live broadcast of a sports event. The content is provided in a selection of different bit rates, i.e. alternative, content-related sections that are coded with different bit rates. When content is played back by an MPEG DASH client, the latter automatically selects the one that is suitable for the current connection conditions from the alternatives offered for the next section. The client selects the segment with the highest possible bit rate that can be transmitted in the time available before playback without the playback stalling and having to be buffered again. This enables a DASH client to adapt seamlessly to changing network conditions and guarantee high-quality, smooth playback.
MPEG-DASH is the first bit rate adaptive HTTP-based streaming solution to become an international standard. 
MPEG-DASH uses the widespread HTTP web server infrastructure that is used to deliver all types of Internet content. It enables devices such as televisions with internet access, add-on TV devices, desktop computers, smartphones, tablet computers to access multimedia content (video, TV, radio) delivered via the Internet and, thanks to the adaptive streaming technology, to cope with changing reception conditions. The standardization of a solution for adaptive streaming should provide trust in the market in the universal applicability, compared to similar, more provider-dependent solutions like HLS from Apple, Smooth Streaming from Microsoft or HDS from Adobe.