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• FFMpeg on Android, undefined references to libavcodec functions, although it is listed on command line

  1er juin 2016, par dimsuz

  I have a problem with unresolved references to ffmpeg’s libavcodec functions, so far failed to find the answer in other places (including my mind) :)

  Let me describe my setup - it takes space, but is really basic, it might be that I’m failing to see some error...

  I built an FFMPeg with ndk r5 toolchain, ffmpeg port I got from http://bambuser.com/opensource (as recommended in other questions here). It built fine, so I put several static libraries in my project like this :

  <project>/jni/bambuser_ffmpeg/libavcodec.a
  
  <project>/jni/bambuser_ffmpeg/libavformat.a
  
  <project>/jni/bambuser_ffmpeg/libavcore.a
  
  <project>/jni/bambuser_ffmpeg/libavutil.a
  
  </project></project></project></project>

  Next, I created an Android.mk in bambuser_ffmpeg folder to list these libs as a prebuilt ones :

  LOCAL_PATH := $(call my-dir)
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE := bambuser-libavcore
  
  LOCAL_SRC_FILES := libavcore.a
  
  include $(PREBUILT_STATIC_LIBRARY)
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE := bambuser-libavformat
  
  LOCAL_SRC_FILES := libavformat.a
  
  include $(PREBUILT_STATIC_LIBRARY)
  
  
  
  (same for other two libs)

  Next, I have another module which references these libs in its Android.mk, sets up include paths, etc :

  LOCAL_PATH := $(call my-dir)
  
  
  
  include $(CLEAR_VARS)
  
  
  
  LOCAL_MODULE := ffmpegtest
  
  LOCAL_STATIC_LIBRARIES := bambuser-libavcodec bambuser-libavcore bambuser-libavformat bambuser-libavutil
  
  LOCAL_SRC_FILES := ffmpeg_test.cpp
  
  LOCAL_C_INCLUDES := $(LOCAL_PATH)/../bambuser_ffmpeg/include
  
  LOCAL_LDLIBS    := -llog -lz
  
  
  
  include $(BUILD_SHARED_LIBRARY)

  And finally I have my ffmpeg_test.cpp which is really basic, like this :

  #include 
  
  
  
  extern "C" {
  
  #include <libavcodec></libavcodec>avcodec.h>
  
  #include <libavformat></libavformat>avformat.h>
  
  }
  
  
  
  extern "C" {
  
      JNIEXPORT jint JNICALL Java_com_the7art_ffmpegtest_PaintThread_testFFMpeg(JNIEnv* env, jobject obj, jstring fileName);
  
  }
  
  
  
  JNIEXPORT jint JNICALL Java_com_the7art_ffmpegtest_PaintThread_testFFMpeg(JNIEnv* env, jobject obj, jstring fileName)
  
  {
  
      av_register_all();
  
      return 0;
  
  }

  When I run ndk-build, it compiles fine, but when linking it prints an unresolved reference to almost every function in libavcodec. Looks like only this lib’s functions are failing to be located :

  /home/dimka/src/mobile/android/ffmpegtest/obj/local/armeabi/libavformat.a(allformats.o) :
  In function

  av_register_all':
 /home/dimka/work/suzy/tmp/ffmpeg-android/ffmpeg/libavformat/allformats.c:47:
 undefined reference to
 

  avcodec_register_all’
  /home/dimka/src/mobile/android/ffmpegtest/obj/local/armeabi/libavformat.a(utils.o) :
  In function

  parse_frame_rate':
 /home/dimka/work/suzy/tmp/ffmpeg-android/ffmpeg/libavformat/utils.c:3240:
 undefined reference to
 

  av_parse_video_rate’
  /home/dimka/src/mobile/android/ffmpegtest/obj/local/armeabi/libavformat.a(utils.o) :
  In function

  parse_image_size':
 /home/dimka/work/suzy/tmp/ffmpeg-android/ffmpeg/libavformat/utils.c:3234:
 undefined reference to
 

  av_parse_video_size’
  /home/dimka/src/mobile/android/ffmpegtest/obj/local/armeabi/libavformat.a(utils.o) :
  In function

  flush_packet_queue':
 /home/dimka/work/suzy/tmp/ffmpeg-android/ffmpeg/libavformat/utils.c:1277:
 undefined reference to
 

  av_free_packet’
  /home/dimka/work/suzy/tmp/ffmpeg-android/ffmpeg/libavformat/utils.c:1283 :
  undefined reference to

  av_free_packet'
 /home/dimka/src/mobile/android/ffmpegtest/obj/local/armeabi/libavformat.a(utils.o):
 In function

  get_audio_frame_size’ :
  /home/dimka/work/suzy/tmp/ffmpeg-android/ffmpeg/libavformat/utils.c:766 :
  undefined reference to

  av_get_bits_per_sample'
 /home/dimka/src/mobile/android/ffmpegtest/obj/local/armeabi/libavformat.a(utils.o):
 In function
 

  ff_interleave_add_packet’ :
  /home/dimka/work/suzy/tmp/ffmpeg-android/ffmpeg/libavformat/utils.c:2909 :
  undefined reference to `av_dup_packet’

  and so on...

  I fail to figure why this is happening. I tried running ndk-build V=1 to check the actual linking command, and libavcodec is sitting there perfectly right, like it should. All other ffmpeg libs are there too.

  Any hints ?

• FFMPEG : av_interleaved_write_frame() : Connection reset by peer

  9 mars 2017, par mrcatmann

  I try to broadcast a video from one of my servers to a RTMP server based on NGINX-RTMP. But sometimes there are reconnects because of bad network on RTMP server, and then ffmpeg gives me errors like

  av_interleaved_write_frame(): Connection reset by peer
  
  [flv @ 0x30351a0] Failed to update header with correct duration.
  
  [flv @ 0x30351a0] Failed to update header with correct filesize.
  
  Error writing trailer of (address): Connection reset by peer"

  Tried to use "reconnect" command, but it didn’t help me. The full FFMPEG command is :

  ffmpeg -reconnect 1 -reconnect_at_eof 1 -reconnect_streamed 1 -reconnect_delay_max 4274 -re -i "(file)" -s 640x360 -aspect 16:9  -c copy -f flv "(stream address)" 

  Is there a way to bypass this ? I can’t play the same video from the beginning in this situation, it needs to be continued from the same point.

• WriteToUDP only works on local machine

  26 mai 2017, par Anderson Scouto da Silva

  This script captures a flow entry by ffmpeg and writes to a UDP address.

  The error is that it does not go to the internet, it only stays on the local machine.

  It is not a problem in my internet network, because I made a stream through VLC and opened in another PC and it works normally, with the same parameters, but in this my script is only in the local PC.

  Follow the pictures to help with the question :

  http://imgh.us/1_4575.jpg

  http://imgh.us/2_3278.jpg

  http://imgh.us/3_2694.jpg

  package main
  
  
  
  import (
  
      "os/exec"
  
      "io"
  
      "net"
  
      "log"
  
      "fmt"
  
  )
  
  
  
  func main() {
  
      // UDP connections
  
      conn, err := net.ListenUDP("udp", &net.UDPAddr{IP: net.IPv4zero, Port: 0})
  
      if err != nil {
  
          log.Fatal(err)
  
      }
  
  
  
      // Set the write buffer on UDP
  
      err = conn.SetWriteBuffer(40 * 1024)
  
      if err != nil {
  
          log.Fatal(err)
  
      }
  
  
  
      inputSource := "C:/Users/Administrador/GoglandProjects/CASEncoder/in/teste-4k.mp4"
  
  
  
      // Starts ffmpeg capturing input
  
      cmdName := "ffmpeg"
  
      argsPipe1 := []string{
  
          "-hide_banner",
  
          "-loglevel", "panic",
  
          "-re",
  
          "-i",
  
          inputSource,
  
          "-preset",
  
          "superfast",
  
          "-c:v",
  
          "h264",
  
          "-crf",
  
          "0",
  
          "-c",
  
          "copy",
  
          "-f", "mpegts", "pipe:1",
  
      }
  
      cmdPipe1 := exec.Command(cmdName, argsPipe1...)
  
  
  
      stdoutPipe1, err := cmdPipe1.StdoutPipe()
  
      if err != nil {
  
          log.Fatal(err)
  
      }
  
      err = cmdPipe1.Start()
  
      if err != nil {
  
          log.Fatal(err)
  
      }
  
  
  
      chunk := make([]byte, 40 * 1024)
  
      for {
  
          // reads the output pipe from ffmpeg
  
          nr, err5 := stdoutPipe1.Read(chunk)
  
          fmt.Printf("Readed %d bytes\n", nr)
  
  
  
          if nr > 0 {
  
              validData := chunk[:nr]
  
  
  
              // write to UDP
  
              nw, err := conn.WriteToUDP(validData, &net.UDPAddr{IP: net.IP{233, 10, 10, 13}, Port: 1234})
  
              fmt.Printf("Writed %d bytes\n", nw)
  
              if err != nil {
  
                  log.Fatal(err)
  
              }
  
          }
  
  
  
          if err5 != nil {
  
              // end of file
  
              if err5 == io.EOF {
  
                  break
  
              }
  
              continue
  
          }
  
      }
  
  }