Recording Video Sessions Using WebRTC
Posted By : Anirudh Bhardwaj | 07-Oct-2016
WebRTC is a worldwide standard developed by W3C consortium which mainly focuses on enabling Real Time Communications over the web. Perhaps, the best part about WebRTC is that it is free, open-source and follows a P2P functionality. All the real time communications carried out by webRTC take place over Peer-to-Peer connections. Besides that, WebRTC makes use of HTML5 for establishing these connections.
The use of HTML5 rescinds the requirement of any internal or external plugins thereby making it even more superior than its peers. Although WebRTC is mainly used in voice/video calling, video conferencing and P2P file sharing, it can also be used for recording client side or server side videos. This guide will show you how the video sessions (server-side and client-side) are created using WebRTC. So let’s begin!
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Recording Server-side Videos
In server-side recording, media isn’t sent from browser to browser. Instead, it is sent directly over the media servers. However, the packets sent over the media server aren’t always encrypted. So the question is how the media is encoded before the transmission? Well, actually it’s not encoded before the transmission but the other way round.
When the media is ready to be transmitted, what developers generally do is, they terminate the WebRTC session over the server on both ends. During this period, the media is routed to the receiving end via the server and the decoded media is simultaneously sent for recording and post-processing.
Post Processing of Server-side Media
Before the final transmission, the post-processing of media is done. The processing involves following steps:
Multiplexing of data is done. I.e the media inputs from multiple users are combined to form a single media file which is then transmitted over the server to the end-users.
Changes in format take place. I.e after creating the media file which is to be sent over the server, media conversions can be done to give a desired format to the media file.
File compression takes place. I.e before transmission, the data can be compressed to reduce the file size.
Recording Client-side Videos
The Client-side recording involves following steps:
First of all, the videos are recorded and stored in local storage since WebRTC allows recording and storing video streams locally.
The recorded media is then uploaded to the servers.
Before uploading it to the server, the stored video file may be passed through the post-processing as done in case of server-side videos.
So, that was all about recording client-side and server-side video sessions. But there’s also much more to take care of. For instance, as a developer, you might have to deal with a lot of meta-data and playback issues. So, it is necessary to imbibe as much knowledge of webRTC as you can before stepping into it.
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