linking ffmpeg static library

[LolliF]

Hi, i am trying to link ffmpeg libraries to my SDK c project for Zynq 7030.
gcc states that libraries are build with VFP while my binary .elf is not and so the link fails. i have tried to change gcc floating point option but is not working. do you have any suggestion on what i am missing?
Thank you very much in advance for your help,
Fabrizio Lolli

[t-kuha]

Hello @LolliF

Thank you for the report but I have not encountered such an error...

FYI, I could build an ffmpeg example (decode_video.c from https://github.com/FFmpeg/FFmpeg/blob/master/doc/examples/decode_video.c) on XSDK (2018.2 / Windows ver.) with the static libraries.

And here is the log:

10:50:59 **** Incremental Build of configuration Release for project ffmpeg_test ****
make all 
'Building file: ../src/main.c'
'Invoking: ARM v7 Linux gcc compiler'
arm-linux-gnueabihf-gcc -Wall -O2 -I"D:\zynq-library\imaging\ffmpeg\include" -c -fmessage-length=0 -MT"src/main.o" -MMD -MP -MF"src/main.d" -MT"src/main.o" -o "src/main.o" "../src/main.c"
'Finished building: ../src/main.c'
' '
'Building target: ffmpeg_test.elf'
'Invoking: ARM v7 Linux gcc linker'
arm-linux-gnueabihf-gcc  -o "ffmpeg_test.elf"  ./src/main.o  D:/zynq-library/imaging/ffmpeg/lib/libavcodec.a D:/zynq-library/imaging/ffmpeg/lib/libavdevice.a D:/zynq-library/imaging/ffmpeg/lib/libavfilter.a D:/zynq-library/imaging/ffmpeg/lib/libavformat.a D:/zynq-library/imaging/ffmpeg/lib/libavutil.a D:/zynq-library/imaging/ffmpeg/lib/libswresample.a D:/zynq-library/imaging/ffmpeg/lib/libswscale.a -lm -lpthread
'Finished building target: ffmpeg_test.elf'
' '
'Invoking: ARM v7 Linux Print Size'
arm-linux-gnueabihf-size ffmpeg_test.elf  |tee "ffmpeg_test.elf.size"
   text	   data	    bss	    dec	    hex	filename
11011830	 251824	8220352	19484006	1294d66	ffmpeg_test.elf
'Finished building: ffmpeg_test.elf.size'
' '

10:52:16 Build Finished (took 1m:16s.23ms)

[LolliF]

Thank you for your fast reply, can you share your project's gcc and linker options? i think i am missing something there.(XSDK 2017.2 on centos)

[t-kuha]

@LolliF

Here are the screenshots:

• Include directory
  

• Library setting
  

• Other objects
  

---

BTW, the issue may be coming from the difference in the tool version, especially gcc version; XSDK 2017.2 uses gcc 6.2.1 whereas 2018.2 depends on gcc 7.2.1. If the issue persists, my recommendation then would be to compile ffmpeg by yourself.