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• Starting multiple upstart services after a parent service

  16 mars 2013, par CoryG

  I'm trying to configure upstart to start an ffserver process and many (21) ffmpeg processes - the ffmpeg processes must be started after the ffserver process and all of them should be respawned if they stop.

  So far, for the ffserver process I have :

  # ffserver
  
  
  
  description     "ffserver"
  
  
  
  start on (filesystem and net-device-up IFACE=eth0) and runlevel [2345]
  
  stop on runlevel [!2345]
  
  
  
  respawn
  
  respawn limit 10 5
  
  
  
  pre-start script
  
      test -x /usr/local/bin/ffmpeg || { stop; exit 0; }
  
      test -x /usr/local/bin/ffserver || { stop; exit 0; }
  
  end script
  
  
  
  script
  
      /usr/local/bin/ffserver -f /etc/ffserver.conf
  
  end script
  
  
  
  post-start script
  
      PID=`status ffserver | egrep -oi '([0-9]+)$' | head -n1`
  
      echo $PID > /var/run/ffserver.pid
  
  end script
  
  
  
  post-stop script
  
      rm -f /var/run/ffserver.pid
  
  end script

  Which works fine for ffserver, however I would like to know how to get the ffmpeg services into a similar startup configuration managed by upstart (ideally within a single upstart config file, but I can make 21 different config files if required).

  (it might be worth noting that I'm using the NoDaemon option within the /etc/ffserver.conf file to ensure it doesn't try to daemonize itself and the ffmpeg instances will likewise not be self-daemonized - I would however like pid files for them in /var/run/ffmpegx.pid where x is an identifier [[0-15],0_1_2_3,4_5_6_7,8_9_10_11,12_13_14_15,all] for some other reasons)

• FFmpeg : undefined reference to 'main'

  13 mars 2013, par Yuliya Tarasenko

  I try to build library and get :

  undefined reference to 'main' collect2: ld returned 1 exit status

  This is a .c file I've added in jni folder :

  #include 
  
  #include "creator.h"
  
  
  
  // Use to safely invoke ffmpeg multiple times from the same Activity
  
  JNIEXPORT void JNICALL Java_com_appunite_ffmpeg_FFmpegCreator_run(JNIEnv *env, jobject obj, jobjectArray args)
  
  {
  
  int i = 0;
  
  int argc = 0;
  
  char **argv = NULL;
  
  
  
  if (args != NULL) {
  
      argc = (*env)->GetArrayLength(env, args);
  
      argv = (char **) malloc(sizeof(char *) * argc);
  
  
  
      for(i=0;iGetObjectArrayElement(env, args, i);
  
          argv[i] = (char *)(*env)->GetStringUTFChars(env, str, NULL);
  
      }
  
  }
  
  
  
  main(argc, argv);
  
  }

  This is a .h file :

  /* DO NOT EDIT THIS FILE - it is machine generated */
  
  #include 
  
  /* Header for class com_appunite_ffmpeg_FFmpegCreator */
  
  
  
  #ifndef _Included_com_appunite_ffmpeg_FFmpegCreator
  
  #define _Included_com_appunite_ffmpeg_FFmpegCreator
  
  #ifdef __cplusplus
  
  extern "C" {
  
  #endif
  
  /*
  
   * Class:     com_appunite_ffmpeg_FFmpegCreator
  
   * Method:    run
  
   * Signature: ([Ljava/lang/String;)V
  
  */
  
  JNIEXPORT void JNICALL Java_com_appunite_ffmpeg_FFmpegCreator_run(JNIEnv *, jobject, jobjectArray);
  
  
  
  #ifdef __cplusplus
  
  }
  
  #endif
  
  #endif

  When I comment main(argc, argv) - the build is successful, otherwise - got this error.
  Could anyone help me please ?

• avcodec symbols not found

  13 avril 2013, par seereen

  I am trying to build the example code in FFMPEG library
  I add the libavcode.h , libavcode.a in my project and I set the header search usr/local/include and the library search to usr/local/lib

  when I compile the example I got this errors ... ( all of them related to avcodec library)

  Undefined symbols:
  
   "avcodec_find_encoder(CodecID)", referenced from:
  
    video_encode_example(char const*, CodecID)in main.o
  
    "avcodec_open2(AVCodecContext*, AVCodec*, AVDictionary**)", referenced from:
  
    video_encode_example(char const*, CodecID)in main.o
  
    video_decode_example(char const*, char const*)in main.o
  
    "av_init_packet(AVPacket*)", referenced from:
  
    video_decode_example(char const*, char const*)in main.o
  
    "av_free(void*)", referenced from:
  
    video_encode_example(char const*, CodecID)in main.o
  
    video_encode_example(char const*, CodecID)in main.o
  
    video_encode_example(char const*, CodecID)in main.o
  
    video_decode_example(char const*, char const*)in main.o
  
    video_decode_example(char const*, char const*)in main.o
  
    "avcodec_alloc_context3(AVCodec*)", referenced from:
  
    video_encode_example(char const*, CodecID)in main.o
  
    video_decode_example(char const*, char const*)in main.o
  
    "av_opt_set(void*, char const*, char const*, int)", referenced from:
  
    video_encode_example(char const*, CodecID)in main.o
  
    "av_image_alloc(unsigned char**, int*, int, int, PixelFormat, int)", referenced from:
  
    video_encode_example(char const*, CodecID)in main.o
  
    "avcodec_encode_video(AVCodecContext*, unsigned char*, int, AVFrame const*)", referenced from:
  
    video_encode_example(char const*, CodecID)in main.o
  
    video_encode_example(char const*, CodecID)in main.o
  
    "avcodec_register_all()", referenced from:
  
    _main in main.o
  
    "avcodec_find_decoder(CodecID)", referenced from:
  
    video_decode_example(char const*, char const*)in main.o
  
    "avcodec_decode_video2(AVCodecContext*, AVFrame*, int*, AVPacket const*)", referenced from:
  
    video_decode_example(char const*, char const*)in main.o
  
    video_decode_example(char const*, char const*)in main.o
  
    "avcodec_close(AVCodecContext*)", referenced from:
  
    video_encode_example(char const*, CodecID)in main.o
  
    video_decode_example(char const*, char const*)in main.o
  
    "avcodec_alloc_frame()", referenced from:
  
    video_encode_example(char const*, CodecID)in main.o
  
    video_decode_example(char const*, char const*)in main.o
  
   ld: symbol(s) not found
  
   collect2: ld returned 1 exit status

  
  do you know why I got this problem ?

  Thanks