如何播放3gp ?
昨天下载了个3gp的文件,用mplayer播放,有图像没声音。仔细看了下error信息,原来是audio的编码不认识,网上查了下,似乎也没什么解法。
后来发现ffmpeg能解码,但是要自己加上编码库重新编译。折腾了一个多小时,总算转换成avi,出了声音,感觉好多了。没声音,确实是再好的戏也出不来。
要转换3gp文件,必须要支持amr的编码,因为3gp的audio基本都是用amr编码的。因此,我们必须手动编译ffmpeg加入该编码的支持。
- libmp3lame
首先从Lame Office Site下载Lame,安装。
- opencore-amr
下载opencore-amr-0.1.2,编译安装。
- ffmpeg
从svn仓库下载ffmpeg,编译安装。
svn checkout svn://svn.mplayerhq.hu/ffmpeg/trunk ffmpeg
./configure --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libmp3lame make make install
转换的命令如下:
ffmpeg -i in.3gp -acodec libmp3lame out.avi
- mplayer
这时候如果再重新编译mplayer,那么就能自动检测到amr编码,从而能直接播放3gp文件了。
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