[Libav-user] reduce dll size
i.like.privacy.too at gmail.com
Tue Mar 4 05:24:39 CET 2014
On 03/04/2014 12:58 AM, YIRAN LI wrote:
> 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
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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