Alembik A Java application providing transcoding services for different media types
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transform media transcode media transcoder transcode media transform media

Alembik Description

A Java application providing transcoding services for different media types The Media Transcoding Server (called Alembik) is a Java application providing transcoding services for different media types (image, audio, video, etc). In general server waits for requests containing a list of transcoding jobs. Each job consists of an URL path to a given media resource and a set of parameters according to which the appointed media file should be transformed.The transcoding parameters depend on the input media type. They may specify e.g. size, dimension, duration and format of the desired output file. Alembik offers two mechanisms of server-side parameterization. The first option is to pass a user-agent identifier, which will get resolved into a set of parameters according to the requesting device capabilities. In the second a job may be associated with an id of a predefined parameter set, called transcoding profile, whose list is internally maintained by the server.Once server obtains and validates a request, it starts the transcoding process. The result returned to the requesting party (the client application) is always a response object containing a list of results for all requested transcoding jobs. Generally, each result contains either an URL pointing to the transcoded file location or an error code referring to a reason of the transcoding job failure.Depending on the assumed mode, the server may wait for completion of transcoding processes before sending a response (synchronous mode) or may immediately return control (asynchronous mode). In the second case the client may ask the server about status and/or result properties (like path or size) of any of its scheduled jobs and then (in the case of a positive reply) reach the output media.The architecture of Alembik is based and fully compliant with OMA STI (Open Mobile Alliance Standard Transcoding Interface) specification (version 1.0), which may be found here.The access to the transcoding functionality for Java clients is possible via two distinct ways. The first is the Java Transcoding API with the org.alembik. transcoding manager class serving as an entry point. The second possibility is to use the JSP Transcoding Tag Library providing support for WAP pages development. Actually, the library components also make use of the TranscodingManager instance underneath.Based on its actual configuration, the TranscodingManager connects to the server through either RMI calls or SOAP requests. The connection mode is predetermined during the generation of the Transcoding Client Library, which consists of a set of JAR archives built and bundled for a specific client environment.As for all non-Java clients they may use a direct connection to the transcoding SOAP service or the HTTP servlet-based API. Here are some key features of "Alembik": · asynchronous mode, timeout processing and auto-refreshable status checking introduced for HTTP API · enhanced and configurable error handling for HTTP API (error pages, locale-dependent error images) · DownloadLimit transformation functionality hugely enhanced ('duration', 'treatComplete', 'repeat' and 'start' attributes added) · predefined profile definition file (profile-defs.xml) extracted from EAR/WAR file to an external directory · getTranscodingInfo() provides information on source files too; new FileInfo properties added ("(is)complete" & "load_time") · new Advertisment video transformation · Advertisment, OverlayLogo and TextOverlay transformations introduced for video files too · target's external location support added · new isSourceFileReady and isNotSourceFileReady tags introduced · improved web rendering engine funcionality (added handling of JavaScript, Frames & iFrames, automatical transcode skipping for high-end devices) · new text-related transformations ('NoLinks', 'OnlyText', 'NoOrganizeText') · enhanced navigation bar · refined mobile site detection (the new default strategy is ACTIVE now) · web rendering of embedded videos coming from various providers (YouTube & DailyMotion) What's New in This Release: · FileInfo data works again (from version 4.1) · ExtractFrame works now with conjuction with all other image transformations & complies to the same parameters syntax · OS limitation for a maximum number of directories resolved with arrival of a new Storage structure · Image's upsizeAllowed parameter is taken into account while evaluating hashCode for a transcoded filename · getTranscodingInfo() returns information on all transcoded files (and not only the recently processed ones stored in cache) · transformation parameters and corresponding JSP tag attributes have consistent naming now · upsizeAllowed parameter support implemented for videos · names of extension properties, transformations and their attributes are consistently · treated as case-insensitive

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