__emutls_get_address error on Android packages that include libc++_shared.so

[tanersener]

Description
If the new v4.5.1 packages that include libc++_shared.so are put together with another dependency that has their own libc++_shared.so then ffmpeg-kit fails to start.

Expected behavior
We don't expect to have any issues when apps depend on other native libraries.

Current behavior
ffmpeg-kit fails to start with the following exception.

java.lang.UnsatisfiedLinkError: dlopen failed: cannot locate symbol "__emutls_get_address" referenced by "/data/app/~~2kB8d3EtNmrQeTorQuxsNw==/com.arthenica.ffmpegkit.reactnative.test-H8VCzoSNcb5BSErN7bf4mw==/base.apk!/lib/x86_64/libffmpegkit.so

Environment

• Platform: Android
• Architecture: arm-v7a, arm-v7a-neon, arm64-v8a, x86, x86_64
• Version: v4.5.1 and v4.5.1.LTS
• Android NDK version: r23b

Other
This issue happens because v4.5.1 and v4.5.1.LTS are built with Android NDK r23b. See android/ndk/issues/1639.

[juha-h]

This looks similar to https://github.com/tanersener/ffmpeg-kit/issues/242.

[tanersener]

Yeah, they looks similar. However, the scenario you're describing there is different than what we're experiencing in v4.5.1. v4.5.1 binaries work fine if there is no second libc++_shared.so.

[juha-h]

I just tried with latest ffmpeg-kit main branch and built the libs using 23.1.7779620. Still got the same crash described in https://github.com/tanersener/ffmpeg-kit/issues/242. No problems with 23.0.7599858. Don't know if ndk folks will ever fix the issue.

[tanersener]

The changes implemented in v4.5.1 are tested on multiple computers, multiple simulators & devices. And no issues were found (except this one). I suggest using the test applications under the ffmpeg-kit-test project if you have issues.

[tanersener]

This issue is fixed in v4.5.1-1 and v4.5.1-1.LTS for Android. Upgrade to these versions if you encounter the error described in the first post.

[juha-h]

I build ffmpeg libs like this:

cd ffmpeg-kit && \
ANDROID_SDK_ROOT=/foo/bar \
ANDROID_NDK_ROOT=/opt/Android/ndk/23.1.7779620 \
./android.sh --enable-gpl --no-archive \
	--disable-arm-v7a --disable-arm-v7a-neon --disable-x86 \
	--disable-x86-64 \
	--enable-libvpx --enable-x264 --enable-x265 --enable-libaom \
	--enable-libpng --skip-ffmpeg-kit

My app crashes with __emutls_get_address error also with latest v4.5.1.LTS tag. It does not crash if I change ANDROID_NDK_ROOT to /opt/Android/ndk/23.0.7599858. Most likely it would work also with 22.1.7171670.

[tanersener]

@juha-h See my comment in your issue.

[tanersener]

The summary of this issue is:

Android NDK r23b includes a fix for android/ndk/issues/1551. This fix causes an incompatibility for libc++_shared.so.

1. If you build ffmpeg-kit with Android NDK r23b and enable at least one of the libraries listed in Android Cpp Dependency
2. And, if you depend on another native dependency that has a libc++_shared.so coming from another NDK version (not Android NDK r23b)

Then your application will crash with the error message given in the first post. Use NDK r22b to build ffmpeg-kit until Google releases a fix/workaround to address this issue.

[chankruze]

@tanersener Has Google released a fix/workaround to address this issue yet ? Can i use Android NDK r25b ?

[juha-h]

My app works fine with ANDROID_NDK_ROOT=/opt/Android/ndk/25.2.9519653.

[chankruze]

@juha-h Thanks for the confirmation. I am currently setting up my linux pc to build for Android. Will update here soon.

[agolendukhin]

My app works fine with ANDROID_NDK_ROOT=/opt/Android/ndk/25.2.9519653.

what's the library version you're using?

[juha-h]

@agolendukhin Version of what library? I'm using ndkVersion = 25.2.9519653 and development branch of ffmpeg-kit.

[agolendukhin]

@juha-h I mean what's the version of ffmpeg-kit

[juha-h]

Then I already answered in above.