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• Failed to build Android FFmpeg using the NDK

  6 octobre 2013, par Blaze Tama

  First, I'm a newbie in Ubuntu and Android's Ff-mpeg so please bear with me.

  I'm using this library : https://github.com/appunite/AndroidFFmpeg and I'm trying to build it with Ubuntu 13.04 and Android NDK r9.

  First, I'm getting a C compiler cannot create exec error. After some research (and a little struggling), I noticed that my version is 4.8, while the version in android_build.sh is 4.4.3, so i changed all of those values and the error is gone.

  After that, I tried to build it again, but the libffmpeg.so was not built, which means I failed.

  I tried to see the config.log (vo-amwrbenc's log) and i found those errors :

  configure:4179: /home/tama/Documents/android-ndk-r9/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86/bin/arm-linux-androideabi-gcc --sysroot=/home/tama/Documents/android-ndk-r9/platforms/android-5/arch-arm/  -c -marm -march=armv5 -marm -march=armv5 conftest.c >&5
  
  conftest.c:61:29: error: expected ';', ',' or ')' before 'text'
  
  
  
  /home/tama/Documents/android-ndk-r9/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86/bin/arm-linux-androideabi-ar: conftest.o: No such file or directory
  
  
  
  configure:7482: /home/tama/Documents/android-ndk-r9/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86/bin/arm-linux-androideabi-gcc --sysroot=/home/tama/Documents/android-ndk-r9/platforms/android-5/arch-arm/ -std=gnu99 -E -marm -march=armv5 conftest.c
  
  conftest.c:11:28: fatal error: ac_nonexistent.h: No such file or directory
  
  
  
  configure:7527: $? = 0
  
  configure:7541: /home/tama/Documents/android-ndk-r9/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86/bin/arm-linux-androideabi-gcc --sysroot=/home/tama/Documents/android-ndk-r9/platforms/android-5/arch-arm/ -std=gnu99 -E -marm -march=armv5 conftest.c
  
  conftest.c:11:28: fatal error: ac_nonexistent.h: No such file or directory

  And more errors which are contained in the C code.

  Please kindly download my config.log (less than 50KB) if you need more information : https://www.dropbox.com/s/ptn1gvnik3v341y/config.log

  I'm racing with time now, any help is appreciated.

• How to correctly setup Linker in Eclipse IDE 4.8.0M4 for ffmpeg development (Ubuntu)

  28 janvier 2018, par boergi

  I am using Eclipse IDE 4.8.0M4 on Ubunto 16.04. I try to compile the code from a FFmpeg tutorial on GitHUB : (https://github.com/leandromoreira/ffmpeg-libav-tutorial/blob/master/0_hello_world.c). For setting up FFmpeg in Eclipse i used this guide :(https://trac.ffmpeg.org/wiki/Setup_Eclipse_IDE_for_FFmpeg_(Linux)).

  The header files and libaries are all in the folder /home/git/ffmpeg. (e.g. avcodec.h and libavcodec.a is in the folder /home/git/ffmpeg/libavcodec). Included libs : -lavcodec -lpostproc -lz -llzma -lrt -lavfilter -lswresample -lavdevice -lswscale -lavutil -lavformat

  Console output :

  12:34:30 **** Incremental Build of configuration Debug for project ffmpeg_test ****
  
  make all 
  
  Building target: ffmpeg_test
  
  Invoking: GCC C Linker
  
  gcc -L/home/git/ffmpeg/libavcodec -L/home/git/ffmpeg/libavformat -o "ffmpeg_test"  ./src/simpletest.o   -lavcodec -lpostproc -lz -llzma -lrt -lavfilter -lswresample -lavdevice -lswscale -lavutil -lavformat
  
  ./src/simpletest.o: In function `main':
  
  /home/boergi/eclipse-workspace/ffmpeg_test/Debug/../src/simpletest.c:141: undefined reference to `avcodec_parameters_to_context'
  
  /home/boergi/eclipse-workspace/ffmpeg_test/Debug/../src/simpletest.c:163: undefined reference to `av_packet_alloc'
  
  /home/boergi/eclipse-workspace/ffmpeg_test/Debug/../src/simpletest.c:194: undefined reference to `av_packet_free'
  
  ./src/simpletest.o: In function `decode_packet':
  
  /home/boergi/eclipse-workspace/ffmpeg_test/Debug/../src/simpletest.c:214: undefined reference to `avcodec_send_packet'
  
  /home/boergi/eclipse-workspace/ffmpeg_test/Debug/../src/simpletest.c:225: undefined reference to `avcodec_receive_frame'
  
  collect2: error: ld returned 1 exit status
  
  makefile:30: recipe for target 'ffmpeg_test' failed
  
  make: *** [ffmpeg_test] Error 1
  
  
  
  12:34:31 Build Finished (took 519ms)

  I found out that "int avcodec_parameters_to_context(AVCodecContext *codec, const AVCodecParameters *par)" is defined in utils.c (also in the /libavcodec folder), but i don’t know what can i do to get this running.

  boergi@Ubuntu-b:~/git/ffmpeg$ ffmpeg -version
  
  ffmpeg version N-89895-g7723750 Copyright (c) 2000-2018 the FFmpeg developers
  
  built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.5) 20160609
  
  configuration: 
  
  libavutil      56.  7.100 / 56.  7.100
  
  libavcodec     58.  9.100 / 58.  9.100
  
  libavformat    58.  5.101 / 58.  5.101
  
  libavdevice    58.  0.101 / 58.  0.101
  
  libavfilter     7. 11.101 /  7. 11.101
  
  libswscale      5.  0.101 /  5.  0.101
  
  libswresample   3.  0.101 /  3.  0.101

• How I can to extract video thumbnails(keyframes) from videofile without blackframes using Ffmpeg ? [on hold]

  21 mars 2014, par user3021440

  How I can to extract video thumbnails(keyframes) from videofile without blackframes using Ffmpeg ? Now, my command is

  ffmpeg -progress "/home/bogdanovich/parser/images/videos/previews/Klondike.2014.S01E01.Paradox.WEBDLRip/original/createlog.txt" -y -ss 10 -timelimit 3600 -i "/home/bogdanovich/Media/Klondike.(s01).Paradox/Klondike.2014.S01E01.Paradox.WEBDLRip.flv" -frames:v 10 -r 0.05 -vf select="isnan(prev_selected_t)+gte(t-prev_selected_t\,180)*eq(pict_type\,I)" -an -vsync vfr "/home/bogdanovich/parser/images/videos/previews/Klondike.2014.S01E01.Paradox.WEBDLRip/original/%03d.jpeg" > /dev/null &