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• Visual Studio LNK2001 Error, despite using extern "C" for ffmpeg libraries in C++ [duplicate]

  1er février 2020, par Faizan Cassim

  This is what it looks like :

  ’’’

  extern "C"
  
  {
  
  #include "libavcodec/avcodec.h"
  
  #include "libavformat/avformat.h"
  
  #include "libavutil/avutil.h"
  
  };

  ’’’

  But I still get these errors when using the FFmpeg libraries in Visual Studio 2019

  1>AudioFile.obj : error LNK2001: unresolved external symbol avformat_open_input
  
  1>AudioFile.obj : error LNK2001: unresolved external symbol av_read_frame
  
  1>AudioFile.obj : error LNK2001: unresolved external symbol av_free
  
  1>AudioFile.obj : error LNK2001: unresolved external symbol av_get_sample_fmt_name
  
  1>AudioFile.obj : error LNK2001: unresolved external symbol avformat_close_input
  
  1>AudioFile.obj : error LNK2001: unresolved external symbol av_init_packet
  
  1>AudioFile.obj : error LNK2001: unresolved external symbol avcodec_receive_frame
  
  1>AudioFile.obj : error LNK2001: unresolved external symbol avcodec_open2
  
  1>AudioFile.obj : error LNK2001: unresolved external symbol av_sample_fmt_is_planar
  
  1>AudioFile.obj : error LNK2001: unresolved external symbol avcodec_close
  
  1>AudioFile.obj : error LNK2001: unresolved external symbol av_get_bytes_per_sample
  
  1>AudioFile.obj : error LNK2001: unresolved external symbol av_packet_unref
  
  1>AudioFile.obj : error LNK2001: unresolved external symbol avformat_find_stream_info
  
  1>AudioFile.obj : error LNK2001: unresolved external symbol av_find_best_stream
  
  1>AudioFile.obj : error LNK2001: unresolved external symbol av_frame_alloc

  I would be greatfull to anyone who could help me resolve this. I am using C++ for Windows.

• Android Studio FFMPEG "Protocol not found"

  26 novembre 2022, par Whitestripe7773

  I am trying to run ffmpeg with android studio, but when I try the following code it shows this error message :

  


  E/mobile-ffmpeg : content ://media/external/video/media/68 : Protocol not found
E/mobile-ffmpeg : Did you mean file:content ://media/external/video/media/68 ?

  


  This is my code :

  


  inputVideo = "content://media/external/video/media/68"
videoTitle = "abc"
public void method(String inputVideo, String videoTitle) {
        String cmdLine = "-i " + inputVideo + " -vcodec libx265 -crf 28 file:" + videoTitle;
        FFmpeg.execute(cmdLine);
    }


  


  I think that the 'content :' in inputVideo leads to the error but I don't know how I could fix it.
Already tried out the following :

  


  

  • Add 'file :' in front of inputVideo and videoTitle

  


  • Removing 'content ://' from the string leads to not finding the file

  


  


• java.lang.NoClassDefFoundError Android Studio Unity

  26 juin 2017, par Nestoraj

  I’m having some troubles when I try to generate a library that contains another one in Android Studio. First of all I am using Android Studio 2.0 and Unity 5.3.4f1. What I want to do is integrate FFMpeg in Unity so I decided to create my own library that use FFMpeg library as an intermediary. The FFMpeg library is here.

  To start I created a new empty project in Android Studio and inside of it, created a new module, which will be my library, using New->Module->Android Library and named it "ffmpegcodec". After that I opened build.gradle file inside the new module folder and paste :

  compile 'com.writingminds:FFmpegAndroid:0.3.2'

  inside dependencies brackets, and click Sync (It did not show any error).

  After that create a new Java Class inside src/main/java/package-name/ and named it FFMpegCodec. Inside this paste this code :

  public class FFMpegCodec {
  
  private static FFmpeg ffmpeg;
  
  private static Context context;
  
  private static FFMpegCodec INSTANCE = null;
  
  
  
  public FFMpegCodec(){
  
      INSTANCE = this;
  
  }
  
  
  
  public static FFMpegCodec instance(){
  
      if(INSTANCE == null){
  
          INSTANCE = new FFMpegCodec();
  
      }
  
      return INSTANCE;
  
  }
  
  
  
  public void setContext(Context ctx){
  
      this.context = ctx;
  
  }
  
  
  
  public void loadFFMpegBinary() {
  
      try {
  
          if (ffmpeg == null) {
  
  
  
              ffmpeg = FFmpeg.getInstance(context);
  
          }
  
          ffmpeg.loadBinary(new LoadBinaryResponseHandler() {
  
              @Override
  
              public void onFailure() {
  
                  Log.e("FFMPEG", "ffmpeg : NOT correct Loaded");
  
              }
  
  
  
              @Override
  
              public void onSuccess() {
  
                  Log.e("FFMPEG", "ffmpeg : correct Loaded");
  
              }
  
          });
  
      } catch (FFmpegNotSupportedException e) {
  
  
  
      } catch (Exception e) {
  
  
  
      }
  
  }
  
  
  
  public void execFFmpegCommand(final String[] command) {
  
      try {
  
          ffmpeg.execute(command, new ExecuteBinaryResponseHandler() {
  
              @Override
  
              public void onFailure(String s) {
  
                  Log.e("FFMPEG", "FAILED with output : " + s);
  
              }
  
  
  
              @Override
  
              public void onSuccess(String s) {
  
                  Log.e("FFMPEG", "SUCCESS with output : " + s);
  
              }
  
  
  
              @Override
  
              public void onProgress(String s) {
  
                  Log.e("FFMPEG", "Started command : ffmpeg " + command);
  
                  Log.e("FFMPEG", "progress : " + s);
  
              }
  
  
  
              @Override
  
              public void onStart() {
  
                  Log.e("FFMPEG", "Started command : ffmpeg " + command);
  
  
  
              }
  
  
  
              @Override
  
              public void onFinish() {
  
                  Log.e("FFMPEG", "Finished command : ffmpeg " + command);
  
  
  
              }
  
          });
  
      } catch (FFmpegCommandAlreadyRunningException e) {
  
          // do nothing for now
  
      }
  
  }

  It basically generates an instance of FFmpeg and makes calls of ffmpeg commands.

  Once I have my lib done I decided to test it in my project so I include my lib in my app graddle using :

  compile project(':ffmpegcodec')

  After that I just paste this code to my MainActivity :

  public class MainActivity extends AppCompatActivity {
  
  
  
  FFMpegCodec ffmpeg;
  
  
  
  @Override
  
  protected void onCreate(Bundle savedInstanceState) {
  
      super.onCreate(savedInstanceState);
  
      setContentView(R.layout.activity_main);
  
  
  
      Button execCommandButton = (Button) findViewById(R.id.execCommandButton);
  
  
  
      ffmpeg = FFMpegCodec.instance();
  
  
  
  
  
      execCommandButton.setOnClickListener(new View.OnClickListener() {
  
          @Override
  
          public void onClick(View v) {
  
              Toast.makeText(getApplicationContext(), "This is a Toast!!", Toast.LENGTH_SHORT).show();
  
              ffmpeg.setContext(MainActivity.this);
  
              ffmpeg.loadFFMpegBinary();
  
              String []cmd = new String[1];
  
              cmd[0] = "-version";
  
              ffmpeg.execFFmpegCommand(cmd);
  
          }
  
      });
  
  
  
  }

  After that, I run my project and when I press the button it returns that everythings its ok, showing ffmpeg version.
  Once I have check that my lib works I decide to move it to Unity so copy the ffmpegcodec-realese.arr file inside ffmpegcodec/build/outputs/aar folder and paste it into my Unity project. Then I wrote an C# script to use my lib that contains this :

      using System;
  
      using System.Runtime.InteropServices;
  
      using UnityEngine;
  
      using System.Collections;
  
      using System.Diagnostics;
  
  
  
      public class ScreenRecorder {
  
  
  
      private AndroidJavaObject unityActivity = null;
  
      private AndroidJavaObject captureObject = null;
  
  
  
          // Use this for initialization
  
          public ScreenRecorder () {
  
              try{
  
  
  
                  using (AndroidJavaClass unityPlayerActivityClass = new AndroidJavaClass("com.unity3d.player.UnityPlayer")) {
  
                      unityActivity = unityPlayerActivityClass.GetStatic<androidjavaobject>("currentActivity");
  
                  }
  
  
  
                  AndroidJavaClass captureClass = new AndroidJavaClass ("com.promineostudios.ffmpegcodec.FFMpegCodec");
  
                  if (captureClass != null) {
  
                      captureObject = captureClass.CallStatic<androidjavaobject>("instance");
  
                      captureObject.Call("setContext", unityActivity);
  
                      captureObject.Call("loadFFMpegBinary");
  
                  }
  
              }catch(Exception ex){
  
                  UnityEngine.Debug.Log(ex);
  
              }
  
          }
  
  
  
      }
  
  </androidjavaobject></androidjavaobject>

  The problems comes here. When I create a class instance using :

  AndroidJavaClass captureClass = new AndroidJavaClass ("com.promineostudios.ffmpegcodec.FFMpegCodec");

  It creates an instance correctly, and also when I create an object using :

  captureObject = captureClass.CallStatic<androidjavaobject>("instance");
  
  </androidjavaobject>

  But when I try to get access to FFMpeg library methods like in "setContext" it fails and returns this :

  UnityEngine.AndroidJavaException: java.lang.NoClassDefFoundError: Failed resolution of: Lcom/github/hiteshsondhi88/libffmpeg/FFmpeg;
  
  java.lang.NoClassDefFoundError: Failed resolution of: Lcom/github/hiteshsondhi88/libffmpeg/FFmpeg;
  
    at com.promineostudios.ffmpegcodec.FFMpegCodec.loadFFMpegBinary(FFMpegAndroidCodec.java:39)
  
    at com.unity3d.player.UnityPlayer.nativeRender(Native Method)
  
    at com.unity3d.player.UnityPlayer.a(Unknown Source)
  
    at com.unity3d.player.UnityPlayer$b.run(Unknown Source)
  
  Caused by: java.lang.ClassNotFoundException: Didn't find class "com.github.hiteshsondhi88.libffmpeg.FFmpeg" on path: DexPathList[[zip file "/data/app/com.promineostudios.ffmpegmodule-1/base.apk"],nativeLibraryDirectories=[/data/app/com.promineostudios.ffmpegmodule-1/lib/arm, /vendor/lib, /system/lib]]
  
    at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
  
    at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
  
    at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
  
    at com.promineostudios.ffmpegcodec.FFMpegCodec.loadFFMpegBinary(FFMpegAndroidCodec.java:39) 
  
    at com.unity3d.player.UnityPlayer.nativeRender(Native Method) 
  
    at com.unity3d.player.UnityPlayer.a(Unknown Source) 
  
    at com.unity3d.player.UnityPlayer$b.run(Unknown Source)

  I think that the problem is in when I export my lib into Unity but I do not know what is going wrong. If anybody could help me I will be really appreciated.

  Thanks and excuse me for my English.