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• FFMPEG undefined reference to `avdevice_register_all'

  23 février 2016, par user3177342

  I’m trying to build simple programm using ffmpeg

  #include 
  
   #include 
  
   #define __STDC_CONSTANT_MACROS
  
  extern "C" {
  
   #include <libavcodec></libavcodec>avcodec.h>
  
   #include <libavformat></libavformat>avformat.h>
  
   #include <libavformat></libavformat>avio.h>
  
  #include <libavdevice></libavdevice>avdevice.h>
  
  #include <libavutil></libavutil>time.h>
  
   }
  
  
  
  
  
  #include <iostream> 
  
  
  
  
  
   int main( int argc, char* argv[] )
  
   {
  
     AVCodec *icodec;
  
    AVFormatContext *ifcx = NULL;
  
    AVInputFormat *ifmt;
  
    AVCodecContext *iccx;
  
     AVStream *ist;
  
     AVStream *ost;
  
     AVPacket pkt;
  
     int i_index;
  
    int64_t timenow, timestart;
  
     int got_key_frame = 0;
  
  
  
     AVFormatContext *ofcx;
  
  
  
     const char *sProg = argv[ 0 ];
  
     const char *sFileInput;
  
     const char *sFileOutput;
  
    int64_t bRunTime;
  
  
  
    bRunTime = atoi( argv[ 2 ] ) * 1000000;
  
  
  
     // Initialize library
  
     av_log_set_level( AV_LOG_DEBUG );
  
     av_register_all();
  
     avcodec_register_all(); 
  
     avformat_network_init();
  
     avdevice_register_all();
  
  </iostream>

  And i get these errors

  g++ -o rtsp3 -I/usr/include -I/usr/local/include rtsp3.cpp -lavformat -lavcodec -lavutil -lm -lz -lva -lpthread
  /tmp/ccAXDgvi.o : In function

  main':
rtsp3.cpp:(.text+0x115): undefined reference to

  avdevice_register_all’
  /usr/local/lib/libavformat.a(matroskadec.o) : In function

  matroska_decode_buffer':
/home/user/projects/ffmpeg-git/ffmpeg/libavformat/matroskadec.c:1242: undefined reference to

  BZ2_bzDecompressInit’
  /home/user/projects/ffmpeg-git/ffmpeg/libavformat/matroskadec.c:1257 : undefined reference to

  BZ2_bzDecompress'
/home/user/projects/ffmpeg-git/ffmpeg/libavformat/matroskadec.c:1250: undefined reference to

  BZ2_bzDecompressEnd’
  /home/user/projects/ffmpeg-git/ffmpeg/libavformat/matroskadec.c:1262 : undefined reference to `BZ2_bzDecompressEnd’
  collect2 : error : ld returned 1 exit status

  I have git version of ffmpeg and successfully compiled it and make install.

• How many "Ruby on Rails" sites can be hosted using sub url in apache configuration file on apache4 with passenger4 on Ubuntu server ?

  17 octobre 2013, par user1731249

  Server's Hardware config :
  Ubuntu server 12.04, CPU : dual code (64-bit), RAM : 8GB, Disk : 200GB.

  Server's Software config :
  Apache2, Passenger4, Rails4, ruby2, MySQL.

  I'm developing a Ruby on Rails website which performs following tasks.

  1. Upload a series of images as zip.
  2. Extract zip images to temp directory.
  3. Convert series of images to video using FFMPEG.
  4. updating video info in MySQL db
  5. Viewing the video in HTML5 video tag.

  Maximum length of single video being 1min and on an average there may be 50 videos to be converted per day. I created three copies (Don't ask me why !) of same website and hosting three sites as sub-URLs like "example.com" being the domain and example.com/site1, example.com/site2, example.com/site3. Below is the Apache configuration :
  RailsAutoDetect off

  ServerName 127.0.0.1

      DocumentRoot /home/ubuntuuser/work/public
  
      ErrorDocument 404 /404.html
  
  
  
  RailsBaseURI /site1
  
  
  
      <directory></directory>home/ubuntuuser/work/site1/advisor/public>
  
              Allow from all
  
      Options -MultiViews
  
              RailsEnv production
  
      
  
  
  
  RailsBaseURI /site2
  
  
  
  <directory></directory>home/ubuntuuser/work/site2/advisor/public>
  
              Allow from all
  
      Options -MultiViews
  
              RailsEnv production
  
      
  
  
  
      RailsBaseURI /site3
  
  
  
  <directory></directory>home/ubuntuuser/work/site3/advisor/public>
  
              Allow from all
  
      Options -MultiViews
  
              RailsEnv production
  
      

  How many such sites can I host with sub-URLs without big performance drag ?
  Also please help to do a performance test for all the sub-URLs.

• FFmpeg Android compilation : command not found

  18 février 2019, par maxest

  So I’m trying to build, on Ubuntu, FFmpeg from sources. Here’s a script I assembled from here and there :

  #!/bin/bash
  
  
  
  NDK=$HOME/Desktop/adt/android-ndk-r19b
  
  SYSROOT=$NDK/platforms/android-26/arch-arm/
  
  TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64
  
  
  
  function build_one
  
  {
  
  ./configure
  
    --prefix=$PREFIX
  
    --arch=arm
  
    --target-os=linux
  
    --enable-cross-compile
  
    --cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi-
  
    --sysroot=$SYSROOT
  
    --extra-cflags="-Os -fpic $ADDI_CFLAGS"
  
    --extra-ldflags="$ADDI_LDFLAGS"
  
    $ADDITIONAL_CONFIGURE_FLAG
  
  
  
    make clean
  
    make -j9
  
    make install
  
  }
  
  
  
  CPU=arm
  
  PREFIX=$(pwd)/android/$CPU
  
  ADDI_CFLAGS="-marm"
  
  
  
  build_one

  Unfortunately I get a list of following outputs :

  ffbuild/config.sh is unchanged
  
  
  
  ./build_android_2.sh: line 26: --prefix=/home/maxest/Desktop/adt/android-ndk-r19b/sources/ffmpeg-4.1/android/arm: No such file or directory
  
  
  
  ./build_android_2.sh: line 27: --arch=arm: command not found
  
  
  
  ./build_android_2.sh: line 28: --target-os=linux: command not found
  
  
  
  ./build_android_2.sh: line 29: --enable-cross-compile: command not found
  
  
  
  ./build_android_2.sh: line 30: --cross-prefix=/home/maxest/Desktop/adt/android-ndk-r19b/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-: No such file or directory
  
  
  
  ./build_android_2.sh: line 31: --sysroot=/home/maxest/Desktop/adt/android-ndk-r19b/platforms/android-26/arch-arm/: No such file or directory
  
  
  
  ./build_android_2.sh: line 32: --extra-cflags=-Os -fpic -marm: command not found
  
  
  
  ./build_android_2.sh: line 34: --extra-ldflags=: command not found

  I’ve double checked all the paths are correct. Although I create by hand folder /home/maxest/Desktop/adt/android-ndk-r19b/sources/ffmpeg-4.1/android/arm because there were no folder android/arm.