Jonas Karlman
Consultant at Fellowmind
Gothenburg, Sweden
Summary
🤩
Rockstar🎓
Top SchoolJonas Karlman is a consultant based in Gothenburg with 15 years of hands-on experience in embedded systems, media playback, and low-level Linux development. He has deep expertise enabling hardware on Rockchip-based SBCs, contributing to U-Boot and the Linux device tree, and optimizing media stacks like Kodi/ffmpeg for stable playback. An active open-source contributor, Jonas has improved boot, GPU, eMMC and network support across prominent projects such as torvalds/linux, u-boot and multiple KODI-focused distributions (LibreELEC, CoreELEC, OpenELEC). His work spans from patching build systems and drivers to back-end web-server fixes for media frontends, showing fluency across firmware, kernel, and application layers. Known for pragmatic problem-solving, he often surfaces subtle hardware integration fixes that prevent intermittent failures in production devices. Trained at KTH, he combines academic grounding with long-term delivery experience at Fellowmind.
15 years of coding experience
Bachelor, Computer Science and Engineering, Bachelor, Computer Science and Engineering at KTH Royal Institute of Technology
Github Skills (64)
bootloader10
deco10
openelec10
c-language10
sd-card10
hdmi10
audio-playback10
architecture10
embedded-linux10
patch10
mmc10
linux10
rockchip10
build-system10
c-programming10
Programming languages (6)
Github contributions (5)
RasPlex/OpenPHT
Jul 2016 - Apr 2018
OpenPHT is a community driven fork of Plex Home Theater
Role in this project:
Back-end Developer
Back-end DeveloperContributions:12 releases, 47 commits, 13 PRs in 1 year 9 months
Contributions summary:Jonas primarily worked on back-end improvements for the OpenPHT project, focusing on enhancing the web server functionality. They implemented fixes for web server issues, addressed mixed content problems in photo libraries, and re-downloaded theme music when downloads failed. Additionally, the user contributed to the video playback functionality and improved the application's response to server playback terminations.
community-drivenhome-theatertheaterplex
xbmc/xbmc
Jan 2011 - Jan 2020
Kodi is an award-winning free and open source home theater/media center software and entertainment hub for digital media. With its beautiful interface and powerful skinning engine, it's available for Android, BSD, Linux, macOS, iOS, tvOS and Windows.
Role in this project:Back-end Developer
Back-end DeveloperContributions:10 reviews, 294 commits, 50 PRs in 9 years 2 months
Contributions summary:Jonas's contributions primarily focused on improving the ffmpeg integration within the Kodi project. They implemented several changes related to managing and freeing resources associated with ffmpeg codecs, specifically related to video overlay, audio and video decoding, and encoding. The user's work involved modifying core video and audio playback components to improve resource handling and potentially fix memory leaks, ensuring more efficient and stable media playback. These changes touched on multiple components including VideoPlayer, AudioEngine and the OMXPlayer.
pythonentertainmentc-plus-plusiosmultimedia
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