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• avcodec/mpeg4videodec : Check read profile before setting it

  27 juin 2018, par Michael Niedermayer

  avcodec/mpeg4videodec : Check read profile before setting it
  Fixes : null pointer dereference
  
  Fixes : ffmpeg_crash_7.avi
  Found-by : Thuan Pham, Marcel Böhme, Andrew Santosa and Alexandru Razvan Caciulescu with AFLSmart
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/mpeg4videodec.c

• How i can fix selected processor does not support Thumb mode `itt gt'

  22 octobre 2017, par w liu

  When I compiled ffmpeg(version 3.3.4) for Android, I successfully compiled out .so, but there was an error while running the project.

  C :\Users\admin\AppData\Local\Temp\ffmpeg-105062.s : Assembler messages :
  C :\Users\admin\AppData\Local\Temp\ffmpeg-105062.s:43301 : Error : selected processor does not support Thumb mode

  itt gt'
 C:\Users\admin\AppData\Local\Temp\ffmpeg-105062.s:43302: Error: thumb conditional instruction should be in IT block --

  movgt r6,r0’
  C :\Users\admin\AppData\Local\Temp\ffmpeg-105062.s:43303 : Error : thumb conditional instruction should be in IT block —

  movgt r0,r1'
 C:\Users\admin\AppData\Local\Temp\ffmpeg-105062.s:43305: Error: selected processor does not support Thumb mode

  it le’
  C :\Users\admin\AppData\Local\Temp\ffmpeg-105062.s:43306 : Error : thumb conditional instruction should be in IT block —

  movle r0,r2'
 C:\Users\admin\AppData\Local\Temp\ffmpeg-105062.s:43308: Error: selected processor does not support Thumb mode

  it gt’
  C :\Users\admin\AppData\Local\Temp\ffmpeg-105062.s:43309 : Error : thumb conditional instruction should be in IT block — `movgt r6,r0’
  clang.exe : error : assembler command failed with exit code 1 (use -v to see invocation)
  

  NDK=/root/Ndk/android-ndk-r14b
  SYSROOT=$NDK/platforms/android-23/arch-arm/
  TOOLCHAIN=/root/Ndk/android-ndk-r14b/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64
  function build_one
  
  ./configure \
  —prefix=$PREFIX
  —enable-shared
  —disable-static
  —disable-doc
  —enable-ffmpeg
  —disable-ffplay
  —disable-ffprobe
  —disable-ffserver
  —disable-doc
  —disable-symver
  —enable-small
  —cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- \
  —target-os=linux
  —arch=armv7-a
  —enable-cross-compile
  —sysroot=$SYSROOT
  —extra-cflags="-march=armv7-a -mfloat-abi=softfp -mfpu=neon -D__ARM_ARCH_7__ -D__ARM_ARCH_7A__"
  $ADDITIONAL_CONFIGURE_FLAG
  make clean
  make
  make install
  
  CPU=arm
  PREFIX=/root/FFmpegOut/android/$CPU
  build_one

• C program cannot find function which included in header file

  17 juin 2013, par Juneyoung Oh

  I made program like this.

    1 #include 
  
    2 #include 
  
    3 #include 
  
    4 #include "libavformat/avformat.h"
  
    5 
  
    6 int main (int argc, char* argv[]){
  
    7         av_register_all();
  
    8         return 0;
  
    9 }

  My header file located in

  root@ubuntu:/home/juneyoungoh/getDuration# find / -name "avformat.h"
  
  /root/ffmpeg/libavformat/avformat.h
  
  /usr/local/include/libavformat/avformat.h

  then I run with gcc getDuration.c , but I show message like below.

  root@ubuntu:/home/juneyoungoh/getDuration# gcc getDuration.c 
  
  /tmp/ccwjonqH.o: In function `main':
  
  getDuration.c:(.text+0x10): undefined reference to `av_register_all'
  
  collect2: ld returned 1 exit status

  Frankly, I do not have any idea what makes this.

  Thanks for your answers.

  ========================== edited #1 ===========================

  when I "ls /usr/local/lib", I get this.

  root@ubuntu:/home/juneyoungoh/getDuration# ls /usr/local/lib/
  
  libavcodec.a   libavutil.a    libopus.la       libvpx.a   python2.7
  
  libavdevice.a  libfdk-aac.a   libpostproc.a    libx264.a
  
  libavfilter.a  libfdk-aac.la  libswresample.a  libyasm.a
  
  libavformat.a  libopus.a      libswscale.a     pkgconfig

  you can see libavformat.a in the very first of the last line.

  so if I command like what you suggest, I get below.

  /root/ffmpeg/libavformat/vqf.c:244: undefined reference to `av_free_packet'
  
  /usr/local/lib//libavformat.a(vqf.o): In function `add_metadata':
  
  /root/ffmpeg/libavformat/vqf.c:58: undefined reference to `av_malloc'
  
  /root/ffmpeg/libavformat/vqf.c:64: undefined reference to `av_dict_set'
  
  /usr/local/lib//libavformat.a(vqf.o): In function `vqf_read_header':
  
  /root/ffmpeg/libavformat/vqf.c:148: undefined reference to `av_dict_set'
  
  /root/ffmpeg/libavformat/vqf.c:208: undefined reference to `av_log'
  
  /root/ffmpeg/libavformat/vqf.c:216: undefined reference to `av_malloc'
  
  /root/ffmpeg/libavformat/vqf.c:170: undefined reference to `av_log'
  
  /root/ffmpeg/libavformat/vqf.c:121: undefined reference to `av_log'
  
  /root/ffmpeg/libavformat/vqf.c:184: undefined reference to `av_log'
  
  /root/ffmpeg/libavformat/vqf.c:136: undefined reference to `av_log'
  
  /usr/local/lib//libavformat.a(wavenc.o): In function `wav_write_trailer':
  
  /root/ffmpeg/libavformat/wavenc.c:210: undefined reference to `av_rescale'
  
  /usr/local/lib//libavformat.a(wavenc.o): In function `wav_write_packet':
  
  /root/ffmpeg/libavformat/wavenc.c:181: undefined reference to `av_log'

  It is too long, so I just post little part of that.

  I think all link of libavformat has been broken, But I do not know

  what can I do to fix that link.

  I have installed that their official link said.

  https://ffmpeg.org/trac/ffmpeg/wiki/UbuntuCompilationGuideQuantal