This fall, I presented LiTr at Demuxed 2019 conference, shortly after open sourcing it. Popularity of android-transcoder and its forks ( editor by selsamman, MP4Composer-android, Transcoder) demonstrated that there is a need in the Android media community for video/audio transcoding/modification tooling. We decided to write a library from scratch and collaborate with android-transcoder project after completion. However, when we estimated the changes we would need to implement, we realized it would entail a major rewrite with an API break.įurthermore, we wanted to be able to modify video frames, which android-transcoder could not do. We discovered an open source solution in android-transcoder, which performed basic hardware accelerated video/audio transcoding on Android. In order to do that, we needed an on-device transcoder. The solution to this “throwaway data” problem was straightforward: transcode the video on the device to throw away those bytes before sending the video over the network. This was very different from our top consumption format of 720p/5Mbps with us essentially creating a lot of bytes being sent to the backend just to be discarded by server transcoding. Out-of-box video recording resolution on Android cameras, at the time, was about 720 to 1080p with bitrate of 12 to 17 Mbps. This led us to focus on looking at the typical capture parameters. We started with an assumption that users are most likely to share content straight from the mobile device they captured it on. Since video is such a “heavy” consumer of data, any performance gains would significantly improve the user experience. Once the feature was successfully launched and started gaining popularity, we immediately set off to work on performance improvements. Once uploaded, a video would then be transcoded into consumption format and appear in the feed as an update. When posting a video from an Android device, the member could either record it using their device camera app or pick an existing video from the gallery. In 2017, we launched video sharing to give our members the ability to share video content on the feed via the LinkedIn mobile app or a web browser. If a picture’s worth a thousand words, then what about a video?
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