Difference between revisions of "AMV"

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* Extension: amv (or [[mtv]])
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* Extension: amv
* Samples: [http://www.mympxplayer.org/sample-videos-dc7.html]<br><br>
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* Samples:  
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** http://www.mympxplayer.org/sample-videos-dc7.html
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** http://samples.mplayerhq.hu/amv/
  
 
==AMV video origin and history==
 
==AMV video origin and history==
AMV is a video file format, used by [http://en.wikipedia.org/wiki/Chinese_MP4/MTV_Player '''Chinese-made portable MP3 players'''] and created to allow video playback capabilities on inexpensive without increasing the cost of those players with the license royalties (and more processor power). AMV is a video file format contain a [[MTV]] video stream and a [[MP3]] audio stream. The [http://en.wikipedia.org/wiki/Chinese_MP4/MTV_Player '''Chinese MP4/MTV Player'''] (sold as "'''MP4 Player'''" or "'''PMP'''", for '''P'''ersonal '''M'''edia '''P'''layer) that these video-files produced for are flash based [http://en.wikipedia.org/wiki/Digital_audio_player digital audio players], mostly manufactured in China, capable of viewing images, videos, and text files. Although commonly called MP4 players, they are unable to play true [[H.264| MP4 (MPEG-4 AVC H.264)]] formated videos and are limited to the proprietary file formats such as [[AMV]], [[MTV]], [[DMV]], [[MPV]], [[ATV]], and [http://en.wikipedia.org/wiki/Chinese_MP4/MTV_Player#ACT_Audio_Format ACT]. They are a kind of the [http://en.wikipedia.org/wiki/S1_MP3_Player S1 MP3 Player]. This is beginning to change however, as more and more top-branded portable players are starting to support true [[H.264| MP4 (MPEG-4 AVC H.264)]] video files.<br><br><br>
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Little is known about the history of the '''AMV''' file format other than it is used by [http://en.wikipedia.org/wiki/Chinese_MP4/MTV_Player '''Chinese-made portable MP3 players'''] and has supposedly been created to allow video playback capabilities on inexpensive and low end equipment without increasing the cost of those players with the license royalties and more processor power needed for other more complex format/codec pairs.
  
 
==AMV Video File Format==
 
==AMV Video File Format==
When playing AMV formats, there is clearly some image de/compression taking place, as can be demonstrated by a simple calculation (see the [[MTV|MTV Video Format]] article). The image compression is, however, low by modern standards (around 4 pixels/byte, compared with over 10 pixels/byte in the [[MPEG-2]] DVD-Video standard). With a resolution of 128 x 96, and a frame rate of 12 fps, a 30 minute file will be around 80 MegaByte in size.<br><br><br>
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AMV files are a variant of AVI with the strings "AVI" and "avih" in the header replaced with "AMV" and "amvh". The avi header contains several 'garbage' values as many of the parameters are hardcoded. It contains a [[RIFF]] packed stream of video and audio.  
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The video codec is a version of [[Motion JPEG]] with fixed quantization tables (taken from jpeg standard). Audio is a variant of [[IMA ADPCM]] where the first 8 bytes of each frame are:
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* origin (16bits)
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* index (16bits)
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* audio frame length (32bits).
  
 
==AMV and MTV encoding/transcoding information and utilities==
 
==AMV and MTV encoding/transcoding information and utilities==
* [http://www.s1mp3.org/wiki/index.php/Video_encoding AMV encoding tips]
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* [http://code.google.com/p/amv-codec-tools/ amv-codec-tools] (GPLv2)
* [http://www.mympxplayer.org/tools-dc10.html www.mympxplayer.org - MP4 resource site and support forum, with MTV conversion/transcoding tools and utilies, (plus sample downloads)]<br><br><br>
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* [http://svn.rot13.org/index.cgi/amv open source decoder]
 
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* [http://wiki.s1mp3.org/Video_encoding AMV encoding tips]
==Software players that support AMV and MTV playback==
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* [http://www.mympxplayer.org/tools-dc10.html www.mympxplayer.org - MP4 resource site and support forum, with MTV conversion/transcoding tools and utilies, (plus sample downloads)]
*Unknown
 
<br><br><br>
 
 
 
==Hardware players that support AMV and MTV playback==
 
[http://en.wikipedia.org/wiki/Chinese_MP4/MTV_Player '''Chinese-made portable MP3 players'''], also known as [http://en.wikipedia.org/wiki/S1_MP3_Player S1 MP3 Players].<br><br><br>
 
  
 
==External Links==
 
==External Links==
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* [http://www.moviecodec.com/topics/7595p3.html MTV Video Forum]
 
* [http://www.moviecodec.com/topics/7595p3.html MTV Video Forum]
 
* [http://www.youtube.com/watch?v=us507LedkyY (A very negative) video-review of one of these MP4-Player on Youtube]
 
* [http://www.youtube.com/watch?v=us507LedkyY (A very negative) video-review of one of these MP4-Player on Youtube]
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* [http://www.chinavasion.com/index.php/cName/mp4-players-2gb-mp4-players/ Chinavasion - China direct wholesaler of MP4 Players using AMV video format]
  
<br><br><br>
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[[Category:Container Formats]]
 
 
 
[[Category:Video Codecs]]
 
[[Category:Video Codecs]]
[[Category:Undiscovered Video Codecs]]
 

Latest revision as of 16:00, 25 January 2009

AMV video origin and history

Little is known about the history of the AMV file format other than it is used by Chinese-made portable MP3 players and has supposedly been created to allow video playback capabilities on inexpensive and low end equipment without increasing the cost of those players with the license royalties and more processor power needed for other more complex format/codec pairs.

AMV Video File Format

AMV files are a variant of AVI with the strings "AVI" and "avih" in the header replaced with "AMV" and "amvh". The avi header contains several 'garbage' values as many of the parameters are hardcoded. It contains a RIFF packed stream of video and audio.

The video codec is a version of Motion JPEG with fixed quantization tables (taken from jpeg standard). Audio is a variant of IMA ADPCM where the first 8 bytes of each frame are:

  • origin (16bits)
  • index (16bits)
  • audio frame length (32bits).

AMV and MTV encoding/transcoding information and utilities

External Links