#dylib

In one of my projects I needed ffmpeg to be included in the app bundle. I didn't wanted to build it on my own, so I googled for a static compiled binary and, actually, found it. Great, it's working. But not for long, my laziness is my enemy =)

At some point I realized I need ffprobe tool also. So, should I embed ffprobe static build too? No, absolutely not, 60 MB of distribution size? No way, sir.

I need to include ffmpeg+ffprobe+dylibs into my bundle, it's obvious. I, actually, built it with help of guide I mentioned above. But then I thought: what if there is a simplier way for osx developers. I had a ffmpeg installed already by brew. It's incredibly easy to reconfigure it without dealing with make&install ever. What if I could use those binaries in my app? The bad news is those binares were linked against absolute paths.

After some googling, I've found the solution: use install_name_tool to change those absolute paths to @executable_path! With help of otool -L we can get the list of dylibs paths that should be replaced. So, I've made a shell script that does that and viola! My tool uses dynamicly built ffmpeg and ffprobe, problem solved :)

Here is the script (I've made a github gist also, you can thack the changes, if any):

#install ffmpeg if it is not installed (brew list -1 | grep "ffmpeg" >/dev/null) || brew install ffmpeg #update your ffmpeg distribution to the latest version brew outdated ffmpeg || brew upgrade ffmpeg #cleanup the destination folder for file in `ls ffmpeg/*`; do rm -f $file; done; #determine the last local ffmpeg version COPY_FROM_PATH="" for ffmpeg_path in `brew info ffmpeg | grep 'Cellar/ffmpeg/.*\*' | awk -F' ' '{ print $1 }'`; do COPY_FROM_PATH="$(echo $ffmpeg_path)"; done; #copy all the binaries for source in `find $COPY_FROM_PATH/bin -type f`; do cp -v -f $source ./ffmpeg; done; #I need ffprobe and ffmpeg only, so I remove ffserver here. If you need it - comment this line cd ffmpeg && rm -f ffserver && cd .. #replace references to an absolute path with @executable_path #which will allow to run ffmpeg that loads dylibs from the bundle function replace_dlybs() { DYLIBS=`otool -L $1 | grep "/usr/local/Cellar" | awk -F' ' '{print \$1 }'` for dylib in $DYLIBS; do sudo install_name_tool -change $dylib @executable_path/`basename $dylib` $1; done; for dylib in $DYLIBS; do cp -f -n $dylib ./ffmpeg; done; DYLIBS=`otool -L $1 | grep "/usr/local/opt" | awk -F' ' '{print \$1 }'` for dylib in $DYLIBS; do sudo install_name_tool -change $dylib @executable_path/`basename $dylib` $1; done; for dylib in $DYLIBS; do cp -f -n $dylib ./ffmpeg; done; sudo install_name_tool -id @executable_path/`basename $dylib` $1 } #first replace occurences in ffmpeg and ffprobe binaries for file in `ls ffmpeg/*`; do echo replacing dylibs for $file replace_dlybs $file done; #then replace occurrences in all the additional dylibs that were copied in the previous step for file in `ls ffmpeg/*.dylib`; do echo replacing dylibs for $file replace_dlybs $file done;

I need this cmake argument to output dylib files