"The sysroot must be an absolute path" error when building custom native FFmpegKit binary.

[SuganDevp]

Description
When I'm running the command --enable-freetype for android.

checking command to parse llvm-nm output from armv7a-linux-androideabi24-clang object... ok
checking for sysroot... C:/Users/sugan/AppData/Local/Android/Sdk/ndk/25.1.8937393/toolchains/llvm/prebuilt/windows-x86_64/sysroot
configure: error: The sysroot must be an absolute path.

This error logged in build.log file.

To Reproduce
Run command ./android.sh --enable-freetype and check build.log .

Logs
Complete log file build.log

Environment

• Platform: Windows for Android
• Version: v5.1
• Source branch: main
• Android NDK version: 25.1.8937393

[tanersener]

Unfortunately, we do not officially support building the Android library on Windows. The last time we tried, some external libraries were not compatible with Windows Subsystem for Linux. And, the effort needed to patch & maintain them was big. Furthermore, there wasn't a standard package manager on Windows. Even installing prerequisites we have for Android was a problem. Therefore, we decided against supporting it. We have a note about it in our NDK Compatibility guide.

So, we do not guarantee that build script will not fail there.

Logs show that libpng library is not happy about the sysroot provided. I really have no idea why.

My suggestion is to make sure that Android prerequisites are installed and accessible in your PATH. Also, to disable arm-v7a architecture, because it is not supported on Android NDK >= 24.

[SuganDevp]

Then can I try in linux? Is that works? Which platform will be best?

[tanersener]

Linux is the best host for Android.

See our Github Actions we have for Android on Linux there.

[SuganDevp]

Thank you so much @tanersener for your help and quick response. I have build in linux system.

I got this error

Something went wrong bootstrapping makefile fragments
    for automatic dependency tracking.  If GNU make was not used, consider
    re-running the configure script with MAKE="gmake" (or whatever is
    necessary).  You can also try re-running configure with the
    '--disable-dependency-tracking' option to at least be able to build
    the package (albeit without support for automatic dependency tracking).

I have solved this by adding --disable-dependency-tracking in ./configure. Is that fine?

[tanersener]

Could you be more specific? When do you get this error, and to which configure are you applying this option?

android.sh doesn't support that option.

[SuganDevp]

I have added --disable-dependency-tracking in libpng.sh file.

[tanersener]

Well, adding it won't break anything. So, it's fine.

But, also it is not something we see. Do you have all prerequisites listed in Android Prerequisites ?

[SuganDevp]

For LTS build with ndk version we have to use?

[SuganDevp]

Can you please help me on how to add the generated aar file.

I have tried many methods to add the generated aar file. I can't able to achieve that.

How to add custom build library ad per documentation The hybrid plugin must be cloned and native FFmpegKit dependency it has must be replaced with the custom library built..

Please help me out.

[tanersener]

Would you mind having a look at the How to Decrease Binary Size page again. It seems like you are looking at an old version.

And, importing an aar file into an android project is something you can easily find on android documentation or google. Could you check one of those two please?

[SuganDevp]

I looking for using aar file for my flutter app. Is the same Android documentation works for flutter?

[tanersener]

If you look at the directory structure of the flutter plugin you can see that there is an android folder, an ios folder and a macos folder.

• android folder includes a standard android project. Android rules apply there
• ios folder includes an iOS project
• macos folder includes a macOS project

[SuganDevp]

How to build aar for LTS version.

When I use --lts

aarch64-linux-android16-clang command not found

error is logged in config.log

[tanersener]

See NDK Compatibility page.

[SuganDevp]

Thanks a lot...!

I have reduced upto the size 35 MB.

Thanks for your great support.

[sreetejadusi]

@SuganDevp can you make the package open-source? I'm a beginner and I quite don't understand reducing the binary size of compiled APK while using Ffmpeg-kit for Flutter.