[Libav-user] reduce dll size

YIRAN LI mrfun.china at gmail.com
Tue Mar 4 05:35:08 CET 2014

Thanks Camera Man,

Do you know is there any options in configuration to let the ffmpeg make
system strip for us?


2014-03-04 15:24 GMT+11:00 Camera Man <i.like.privacy.too at gmail.com>:

>  On 03/04/2014 12:58 AM, YIRAN LI wrote:
> > Hi,
> >
> > I'm building ffmpeg dlls for Windows using MingW, and the dlls I got
> > seems quite large. libavcodec 8 MB and libavformat 1.5 MB.
> >
> > Firstly may I know, since ffmpeg is built into several dlls, is it
> > possible that same code got built into each dll so that there're
> > some unnecessary waste? Is it possible to build all code into
> > one dll?
> As far as I know there isn't really any waste, and while it is always
> possible to build everything into one dll, that is not supported by the
> existing configure/make system.
> If you configure to only use parts you need (decoders/encoders/parsers),
> the .dlls may be much smaller. However, if you care so much about
> distribution size, you are probably better off using static linking. You
> would still need to configure only the decoders/encoders you need. And you
> must also abide by the licenses of the code you use (e.g. libx264 is GPL,
> meaning that your software must be GPL if you use it; some ffmpeg is LGPL,
> meaning that if you do a static link you will need to LGPL your code as
> well).
> > Second, is there any option I can use to reduce the size of the
> > dlls?
> UPX is useful for this - both for .dlls and for .exes; though note that if
> you do use upx, then mutliple processes will not share their read-only
> memory sections -- e.g. if you have 40MB code (happens with some C++ code
> bases...), and you use UPX and run 10 copies, it will take 400MB of RAM; if
> you don't use UPX, that code will only take ~40MB of ram no matter how many
> copies you run.
> Do remember the license issues though.
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> Libav-user at ffmpeg.org
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