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Flash Video - Wikipedia. Flash Video. Filename extension. Internet media typevideo/x- flv, video/mp. Developed by. Adobe Systems (originally developed by Macromedia)Type of format. Tabtight professional, free when you need it, VPN service. Media container. Container for. Audio, video, text, data. Extended from. FLV: SWFF4. V: MPEG- 4 Part 1. ![]() Flash Video is a container file format used to deliver digital video content (e. TV shows, movies, etc.) over the Internet using Adobe Flash Player version 6 and newer. Flash Video content may also be embedded within SWF files. There are two different video file formats known as Flash Video: FLV and F4. V. The audio and video data within FLV files are encoded in the same manner as they are within SWF files. The F4. V file format is based on the ISO base media file format and is starting with Flash Player 9 update 3.[1][2] Both formats are supported in Adobe Flash Player and developed by Adobe Systems. FLV was originally developed by Macromedia. In the early 2. 00. Flash Video used to be the de facto standard for web- based streaming video (over RTMP). Notable users of it include Hulu, VEVO, Yahoo! Video, metacafe, Reuters. Flash Video FLV files usually contain material encoded with codecs following the Sorenson Spark or VP6video compression formats. The most recent public releases of Flash Player (collaboration between Adobe Systems and Main. Concept) also support H. HE- AAC audio.[3] All of these compression formats are restricted by patents. Flash Video is viewable on most operating systems via the Adobe Flash Player and web browserplugin or one of several third- party programs. Apple's i. OS devices, along with almost all other mobile devices, do not support the Flash Player plugin and so require other delivery methods such as provided by the Adobe Flash Media Server.[4]History[edit]Support for video in SWF file format was added in Flash Player 6, released in 2. In 2. 00. 3, Flash Player 7 added direct support for FLV file format. Because of restrictions in the FLV file format, Adobe Systems has created in 2. ISO base media file format (MPEG- 4 Part 1. Flash Player does not check the extension of the file, but rather looks inside the file to detect which format it is.[5][6] The new file formats are completely different from the older FLV file format. For example, F4. V does not support Screen video, Sorenson Spark, VP6 video compression formats and ADPCM, Nellymoser audio compression formats.[1][6] Authors of Flash Player strongly encourage everyone to embrace the new standard file format F4. V (ISO base media file format). There are functional limits with the FLV structure when streaming H. AAC which could not be overcome without a redesign of the file format. This is one reason why Adobe Systems is moving away from the traditional FLV file structure.[6] Initial format since 2. Flash Video, file suffix is . MIME derived Internet media type of video/x- flv. Extended from 2. 00. ISO base media file format, Adobe branded file suffix is . MIME derived Internet media type of video/mp. Apple file suffix of . Adobe branded file suffixes exist for . Adobe Access DRM scheme with . MIME derived Internet media type of audio/mp. SWF files published for Flash Player 6 and later versions are able to exchange audio, video, and data over RTMP connections with the Adobe Flash Media Server. One way to feed data to Flash Media Server is from files in the FLV file format. Starting with SWF files created for Flash Player 7, Flash Player can play FLV file format directly (MIME type video/x- flv). Starting with SWF files created for Flash Player 9 Update 3, Flash Player can also play the new F4. V file format.[1]Support for audio and video compression formats in Flash Player and in Flash Video[1][7][8][9]Flash Player version. Released. File format. Video compression formats. Audio compression formats. SWFSorenson Spark, Screen video. MP3, ADPCM, Nellymoser. SWF, FLVSorenson Spark, Screen video. MP3, ADPCM, Nellymoser. SWF, FLVOn. 2 VP6, Sorenson Spark, Screen video, Screen video 2. MP3, ADPCM, Nellymoser. SWF, FLVOn. 2 VP6, Sorenson Spark, Screen video, Screen video 2, H. MP3, ADPCM, Nellymoser, AAC[*]SWF, F4. V, ISO base media file format. H. 2. 64. AAC, MP3. SWF, FLVOn. 2 VP6, Sorenson Spark, Screen video, Screen video 2, H. MP3, ADPCM, Nellymoser, Speex, AAC[*]SWF, F4. V, ISO base media file format. H. 2. 64. AAC, MP3 Use of the H. AAC compression formats in the FLV file format has some limitations and authors of Flash Player strongly encourage everyone to embrace the new standard F4. V file format.[6]Encoding[edit]Commonly, Flash Video FLV files contain video bit streams which are a proprietary variant of the H. Sorenson Spark (Four. CC FLV1).[1. 1][1. Sorenson Spark is an older codec for FLV files but it is also a widely available and compatible one, because it was the first video codec supported in Flash Player.[1. It is the required video compression format for Flash Player 6 and 7.[1. Flash Player 8 and newer revisions also support the playback of On. True. Motion VP6 video bit streams (Four. CC VP6. F or FLV4). On. 2 VP6 is the preferred video compression format for use with Flash Player 8 and higher.[7][1. On. 2 VP6 can provide a higher visual quality than Sorenson Spark, especially when using lower bit rates. On the other hand, it is computationally more complex and therefore will not run as well on certain older system configurations.[1. The Flash Video FLV file format supports two versions of a so- called 'screenshare' (Screen video) codec which is an encoding format designed for screencasts. Both these formats are bitmap tile based, can be lossy by reducing color depths and are compressed using zlib. The second version is only playable in Flash Player 8 and newer. Audio in Flash Video files is usually encoded as MP3. However, audio in Flash Video FLV files recorded from the user's microphone use the proprietary Nellymoser Asao Codec.[8] (Flash Player 1. Speex codec.[1. 7]) FLV files also support uncompressed audio or ADPCM format audio. Recent versions of Flash Player 9 support AAC (HE- AAC/AACSBR, AAC Main Profile, and AAC- LC). Support for encoding Flash Video files is provided by an encoding tool included with Adobe's Flash Professional and Creative Suite products, On. Flix encoding tools, Sorenson Squeeze, FFmpeg and other third party tools. Media type support[edit]Supported media types in both the Flash Video and ISO base media file formats: [1]Supported media types in just the Flash Video file format: [1]General video. RGB (supported by same type code SWF uses)run- length (supported by same type code SWF uses)Sorenson's H. Flash Video)On. 2 True. Motion VP6 with and without alpha channel (added to Flash Video)Animated video are the zlib based Screen 1 and 2 (native to SWF). General audio are PCM and ADPCM (native to SWF). Vocal audio. Nellymoser's Asao @ 1. Hz (native to SWF)a- law and μ- law (native to SWF)Speex (added to FLV)Timed text requires Action. Script specific commands for loading captioning, which is only supported by external text files in either JSON or W3. CXML formats. Supported media types in just the ISO base media file format: [1]Animated video are Quick. Time types for GIF, PNG and JPEG, which replace the Screen 1 and 2 encodings. Timed text requires Action. Script specific commands for loading captions embedded as either EIA- 6. Quick. Time mac based styled text with the 3. GPP derived version that supports Unicode. FLV converters[edit]An FLV converter is a type of video conversion software that is used for turning videos from different formats into FLV. Below is a list of popular free video converters which support conversion to FLV. These programs run under Microsoft Windows. Hand. Brake, FFmpeg and VLC also run under Mac OS X and Linux. Flash Video Structure[edit]FLV files start with a standard header which is shown below: [1. Field. Data Type. Default. Details. Signaturebyte[3]“FLV”Always “FLV”Versionuint. Only 0x. 01 is valid. Flagsuint. 8 bitmask. Bitmask: 0x. 04 is audio, 0x. Header Sizeuint. 32_be. Used to skip a newer expanded header. Packets[edit]After the header, the file is split into packets called "FLV tags", which have 1. The first four bytes denote the size of the previous packet/tag (including the header), and aid in seeking backward. Field. Data Type. Default. Details. Size of previous packetuint. For first packet set to NULLPacket Typeuint. For first packet set to AMF Metadata. Payload Sizeuint. Size of packet data only. Timestamp Loweruint. For first packet set to NULLTimestamp Upperuint. Extension to create a uint. Stream IDuint. 24_be.
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