[Android] avcodec cannot find symbol OMXCodec::Create

[cxo]

Runtime error when invoking ffprobe. Built using tools/build_stagefright

shell@android:/data/local # ./ffprobe /sdcard/VID_20120821_174449.mp4          
soinfo_link_image(linker.cpp:1635): could not load library "libavfilter.so" needed by "./ffprobe"; caused by soinfo_link_image(linker.cpp:1635): could not load library "libavformat.so" needed by "libavfilter.so"; caused by soinfo_link_image(linker.cpp:1635): could not load library "libavcodec.so" needed by "libavformat.so"; caused by soinfo_relocate(linker.cpp:975): cannot locate symbol "_ZN7android8OMXCodec6CreateERKNS_2spINS_4IOMXEEERKNS1_INS_8MetaDataEEEbRKNS1_INS_11MediaSourceEEEPKcj" referenced by "libavcodec.so"...CANNOT LINK EXECUTABLE

255|shell@android:/data/local # ls
ffmpeg
ffprobe
libavcodec.so
libavdevice.so
libavfilter.so
libavformat.so
libavutil.so
libpostproc.so
libswresample.so
libswscale.so
shell@android:/data/local # 

ffmpeg version : git (6b68e2a43b3407522080be50a2a19cff2f9715ef)

Device is a Nexus 10 (Android 4.2.2)

[Michael Niedermayer]

No security issue nor data loss thus not critical priority

[cxo]

I think I have found some useful information;

The missing symbol as shown above is;

_ZN7android8OMXCodec6CreateERKNS_2spINS_4IOMXEEERKNS1_INS_8MetaDataEEEbRKNS1_INS_11MediaSourceEEEPKcj

Which obviously can be found in the version of libstagefright.so from ​http://download.cyanogenmod.com/get/update-cm-7.0.3-N1-signed.zip (which build_stagefright downloads/extracts into ../android-libs )

Whilst libstagefright.so from the Nexus 10 / 4.2.2 contains

_ZN7android8OMXCodec6CreateERKNS_2spINS_4IOMXEEERKNS1_INS_8MetaDataEEEbRKNS1_INS_11MediaSourceEEEPKcjRKNS1_I13ANativeWindowEE

I don't understand these C++ symbols, but if I had to guess it looks like the parameters for OMXCodec::Create has changed?

[Carl Eugen Hoyos]

Is this reproducible with ./configure && make ?
Is it a regression? (Ie: Did it work with an older version of FFmpeg?)

[cxo]

Yes this is easily reproducible with Android 4+

Its actually the opposite of a regression. The issue is that the libstagefright integration was done with a very old version of Android (2.3 aka Gingerbread) and thus is no longer compatible with newer versions of Android/stagefright/openMAX.

I don't believe this has even worked for at least a year now. I was really surprised to see how broken the libstagefright integration is in FFmpeg. I thought this was a popular usage model given that its possibly the only way you can access the OpenMAX hw codec plugins through FFmpeg. Or am I wrong?

I made the necessary changes to libavcodec/libstagefright.cpp to support Android HEAD and got it to compile and it "sorta" worked. But overall the code is really broken and I'm not even going to try go any further. It needs a re-write.

I've resorted to using FFmpeg in parallel with stagefright as opposed to trying to use stagefright/openMAX through FFmpeg. And in Android 4.3 onwards I will be dropping FFmpeg altogether in favour of the new android.media.* classes.

[Carl Eugen Hoyos]

Did you send your changes to the ffmpeg-devel mailing list?

[Carl Eugen Hoyos]

libstagefright was removed.