At LinkedIn we created a library that uses Android’s MediaCodec APIs to transcode video. We use it to reduce the resolution and bitrate of user’s video on device before uploading it, to significantly reduce upload time without reduction in consumption quality. We are in process of open sourcing it and designing new APIs for it to allow easy addition of new functionality (muxing/demuxing, filters, etc.) By Demuxed, library will be open sourced and this talk will about its architecture, out of box capabilities, and how to contribute to it. Our vision for it is to offer production quality (well tested, analytics reporting, etc.) video/audio processing library to open source community as a solid foundation for video processing innovation. This has been an interesting project which would be of interest to mobile video developers, and probably not mobile developers as well – something like hardware accelerated ffmpeg lite. Presented at Demuxed 2019 in San Francisco.