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ffmpeg，libav和avconv之间有什么异同？
当我ffmpeg在Ubuntu上运行时，它显示： $ ffmpeg ffmpeg version v0.8, Copyright (c) 2000-2011 the Libav developers built on Feb 28 2012 13:27:36 with gcc 4.6.1 This program is not developed anymore and is only provided for compatibility. Use avconv instead (see Changelog for the list of incompatible changes). 或显示（取决于Ubuntu版本）： $ ffmpeg ffmpeg version 0.8.5-6:0.8.5-0ubuntu0.12.10.1, …
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ubuntu
audio
ffmpeg
libavcodec
libav