Filesystem Synchronization / Scan

One of the core features of LimboMedia is the binding of existing files and folders somewhere in your filesystem to make them web-accessible. When you access and manipulate these files only via LimboMedia you're fine. Otherwise you need to synchronize LimboMedia with your filesystem from time to time to keep the LimboMedia file index up-to-date. This metadata index is required for fast browsing, search and rights-management. When configured, LimboMedia will scan your disk for new files and folders to add them to the index and will remove deleted files.

Keep in mind, that this synchronization goes always in one direction: from filesystem to LimboMedia. The filesystem is always the 'master' and we do not delete, create or move any files or put strange metadata, thumbnails or other shit into your folders.

You can choose when and how often to run these filescans. We recommend nighty runs since you can trigger the folder synchronization manually by clicking the button right beside the folder, in urgent cases.

Background Media Converter

Prepare your media at night for flawless playback every day.

LimboMedia does it's best for a nice and fast user experience. Therefore images are resized (thumbnails, preview), media files (music, videos) are transcoded to the well supported and open WebM format and subtitles extracted from the original video, if required. This makes LimboMedia fast, saves bandwith and guarantees audio and video playpack on your devices without plugins or additional software.

By default images are resized and subtitles are extracted upon the first request. They are stored on disk for upcoming requests. Music and videos are transcoded to WebM when required/requested. This happens on-the-fly and no data is stored/cached on disk. Transcoding requires a strong cpu and might cause problems when it comes to seeking or fast-forwarding on playback.

Configure the 'Background media converter' to create all the resized images and encoded videos at night, for flawless playback on the next day. You decide which sizes or formats to create. But please be careful: Audio and video encoding takes a lot of time and requires a lot of disk space.

Here's a brief list of all the different types and formats with information about defaults and when they're used, so you can find the right mix between on-thy-fly transcoding and nighly pre-encoding.


Image LayoutsDetailsUsed for
THUMB_S30x30 px - CropThumbnails in list view
THUMB_M60x60 px - CropThumbnails in android app
THUMB_L148x148 px - CropThumbnails in gallery view
XS360x360 px max - Resize, Keep aspect ratio
S720x720 px max - Resize, Keep aspect ratio
M960x960 px max - Resize, Keep aspect ratioFullscreen browser & android app
L1280x1280 px max - Resize, Keep aspect ratio
XL1920x1920 px max - Resize, Keep aspect ratio


Audio FormatsDetailsUsed for
WEBM_VORBISWebM container / Vorbis codecDefault transcoding format if original codec is not supported.
MP3MP3 container / MP3 codec


Video FormatsDetailsUsed for
WEBMWebM container / Vp8 codecDefault transcoding format if original codec is not supported.
MP4MP4 container / H264 videocodec / AAC audiocodecNot transcodable.
Video LayoutsDetailsBest for
P360360p aka 640x360 - about 500kbit/secMobile and low bandwidth
P720720p aka 1280x720 aka HDReady - about 3mbit/secGood deal in quality vs. bandwidth vs. server-CPU-requirements.
P10801080p aka 1920x1080 aka FullHD - about 6mbit/secHigh quality but requires high-bandwidth and a hell of a CPU. Not recommended for on-the-fly transcoding.
SubRipWidely used and broadly compatible subtitle text file format.
WebVTTWeb Video Text Tracks - Modern approach for subtitles, captions, and more.Requires an up-to-date ffmpeg version.

Cleanup of converted and encoded data

As an administrator there're some cleanup actions to delete converted images and encoded audio- and video files. Original files are kept, so these actions are usefull whenever you decide to save some space and use transcoding instead of pre-encoded files or for development and whenever the design changes (image sizes, video formats, ...).