[Libav-user] libav-user list post!

thanh nhan thanh nhan nhanndt_87 at yahoo.com
Mon Mar 4 11:01:04 CET 2013

> From: Carl Eugen Hoyos <cehoyos at ag.or.at>
>To: libav-user at ffmpeg.org 
>Sent: Monday, March 4, 2013 6:16 PM
>Subject: Re: [Libav-user] libav-user list post!
>thanh nhan thanh nhan <nhanndt_87 at ...> writes:
>> I configured like this:
>> ./configure --enable-gpl --enable-libfdk_aac 
>> --enable-libmp3lame --enable-libtheora 
>> --enable-libvorbis --enable-libvpx --enable-libx264
>This includes all default features of FFmpeg (and a few 
>external libraries).
>If you want smaller libraries, you have to change your 
>FFmpeg configure line (it cannot help if you change 
>something about your linking command for your own 
>application x2pcm, that cannot work!) - since you did 
>not explain exactly which features you need, I can 
>only guess but I suggest you start with a line like 
>the following and test, you will find many missing 
>$ ./configure --disable-everything --enable-protocol=file 
>--enable-demuxer=aac,mp3 --enable-parser=aac,mpegaudio 
>--enable-decoder=aac,mp3 --enable-encoder=pcm_s16le 
>Please understand that this is certainly not exactly 
>what you need, it is meant to help finding the right 
>You can further decrease the size of the libraries by 
>using --disable-all instead of --disable-everything 
>but you need to enable even more features in that case.
>--disable-debug should not be necessary since I expect 
>you will strip your final executable anyway, but you 
>can of course add it to configure as well.
>Please google for "top-posting" and please avoid it here, 
>it is considered rude.
>Carl Eugen
>Libav-user mailing list
>Libav-user at ffmpeg.org
Hi Carl Eugen,
Sorry for "top-posting" problem. I changed my style posting. I dont know if it is acceptable or not.
I saw that the ffmpeg library files such as libavcodec.a, libavformat.a....are huge-size files. When we link them into executable file, are they attached into executable file with the whole size no matter which ffmpeg function we use???
I understood what you typed. So, We cannot remove any library in link command. What we can do is downsize the libraries. Am i right?
All of features i need is: decoding the aac, mp3, ogg, flac, wma, m4a, 3ga, wav into pcm file and then resample pcm file into expected sample format, number of channel and sampling rate. Could you pls recommend me the configuration command?

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