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• Problems with ffmpeg build in Xcode

  16 décembre 2016, par jon

  Hi I have a problem with getting ffmpeg libraries to build in my Xcode project. It is in C++ . I have installed it using homebrew and have checked that all the correct libraries have installed via terminal. I have tried with and without extern C as I know it is a c library.

  #include <iostream>
  
  #include <opencv2></opencv2>opencv.hpp>
  
  
  
  #include <libavformat>
  
  
  
  //extern "C" {
  
  //    #include <libavformat>
  
  //}
  
  </libavformat></libavformat></iostream>

  The linker flags have been set by using (e.g. pkg-config —libs libavcodec) in terminal and these flags do not throw up an error when building. The header files are also found with no problems as the autocomplete flags them top while typing.

  Please see attached pictures for Xcode build settings. Really stuck pease help

  

• ffmpeg Exception : Working Directory : null Environment : null

  13 décembre 2016, par Dylan

  Creating the Android app, I am trying to crop video using ffmpeg library and store it in the app directory. I created the command :

  String command = "ffmpeg -i /storage/emulated/0/DMC/diamondVideo.mp4 -vf crop=471:592:162:462 -c:a copy /storage/sdcard0/DMC/diamondVideoCropped.mp4";
  
  String[] cmd = command.toString().split(" ");

  After that I pass this command to the AsyncTask :

  new CropVideoTask().execute(cmd);

  And in my AsyncTask I execute this command :

  private class CropVideoTask extends AsyncTask {
  
  protected Void doInBackground(String[]... cmd) {
  
     FFmpeg ffmpeg = FFmpeg.getInstance(getContext());
  
     try {
  
         ffmpeg.execute(cmd[0], new ExecuteBinaryResponseHandler() {
  
  
  
             @Override
  
             public void onStart() {}
  
  
  
             @Override
  
             public void onProgress(String message) {}
  
  
  
             @Override
  
             public void onFailure(String message) {}
  
  
  
             @Override
  
             public void onSuccess(String message) {}
  
  
  
             @Override
  
             public void onFinish() {}
  
  
  
         });
  
     } catch (FFmpegCommandAlreadyRunningException e) {
  
         // Handle if FFmpeg is already running
  
     }
  
     return null;
  
  }

  After the code enters in onStart method, it throw an Exception :

  12-13 15:43:02.832 28941-32324/com.example.dmc E/FFmpeg: Exception while trying to run: [Ljava.lang.String;@42851b38
  
                                                          java.io.IOException: Error running exec(). Command: [/data/data/com.studioidan.dmc/files/ffmpeg, ffmpeg, -i, /storage/sdcard0/DMC/diamondVideo.mp4, -vf, crop=471:592:162:462, -c:a, copy, /storage/sdcard0/DMC/diamondVideoCropped.mp4] Working Directory: null Environment: null
  
                                                              at java.lang.ProcessManager.exec(ProcessManager.java:211)
  
                                                              at java.lang.Runtime.exec(Runtime.java:168)
  
                                                              at java.lang.Runtime.exec(Runtime.java:123)
  
                                                              at com.github.hiteshsondhi88.libffmpeg.ShellCommand.run(ShellCommand.java:10)
  
                                                              at com.github.hiteshsondhi88.libffmpeg.FFmpegExecuteAsyncTask.doInBackground(FFmpegExecuteAsyncTask.java:38)
  
                                                              at com.github.hiteshsondhi88.libffmpeg.FFmpegExecuteAsyncTask.doInBackground(FFmpegExecuteAsyncTask.java:10)
  
                                                              at android.os.AsyncTask$2.call(AsyncTask.java:287)
  
                                                              at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
  
                                                              at java.util.concurrent.FutureTask.run(FutureTask.java:137)
  
                                                              at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
  
                                                              at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
  
                                                              at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
  
                                                              at java.lang.Thread.run(Thread.java:856)
  
                                                           Caused by: java.io.IOException: No such file or directory
  
                                                              at java.lang.ProcessManager.exec(Native Method)
  
                                                              at java.lang.ProcessManager.exec(ProcessManager.java:209)
  
                                                              at java.lang.Runtime.exec(Runtime.java:168)
  
                                                              at java.lang.Runtime.exec(Runtime.java:123)
  
                                                              at com.github.hiteshsondhi88.libffmpeg.ShellCommand.run(ShellCommand.java:10)
  
                                                              at com.github.hiteshsondhi88.libffmpeg.FFmpegExecuteAsyncTask.doInBackground(FFmpegExecuteAsyncTask.java:38)
  
                                                              at com.github.hiteshsondhi88.libffmpeg.FFmpegExecuteAsyncTask.doInBackground(FFmpegExecuteAsyncTask.java:10)
  
                                                              at android.os.AsyncTask$2.call(AsyncTask.java:287)
  
                                                              at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
  
                                                              at java.util.concurrent.FutureTask.run(FutureTask.java:137)
  
                                                              at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
  
                                                              at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
  
                                                              at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
  
                                                              at java.lang.Thread.run(Thread.java:856)

  Manifest.xml contains premission

  Did I miss something ?

• ffmpeg transpose corrupts video [on hold]

  15 décembre 2016, par Victor.dMdB

  I’m trying to set up a transcoding pipeline with ffmpeg C lib, but if I transpose it, the video is corrupted as shown below.

  If I don’t transpose, the video is fine, ie the rest of the pipeline is correctly set up.

  I’m not actually sure what is actually the issue, is it a problem with the pxiel format ? Why is the transpose corrupting the video stream ? Is there something wrong with my code (added below) ?

  

  The constructor (code was taken from here)

  MyFilter::MyFilter(const std::string filter_desc, AVCodecContext *data_ctx){
  
    avfilter_register_all();
  
    buffersrc_ctx = NULL;
  
    buffersink_ctx = NULL;
  
  
  
      filter_graph = avfilter_graph_alloc();
  
  
  
    AVFilter *buffersink = avfilter_get_by_name("buffersink");
  
    if (!buffersink) {
  
      throw error("filtering sink element not found\n");
  
    }
  
  
  
    if (avfilter_graph_create_filter(&buffersink_ctx, buffersink, "out", NULL, NULL, filter_graph) < 0) {
  
      throw error("Cannot create buffer sink\n");
  
    }
  
  
  
  
  
  filterInputs  = avfilter_inout_alloc();
  
    filterInputs->name       = av_strdup("out");
  
    filterInputs->filter_ctx = buffersink_ctx;
  
    filterInputs->pad_idx    = 0;
  
    filterInputs->next       = NULL;
  
  
  
      AVFilter *buffersrc  = avfilter_get_by_name("buffer");
  
      if (!buffersrc) {
  
          throw error("filtering source element not found\n");
  
      }
  
  
  
      char args[512];
  
      snprintf(args, sizeof(args), "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:pixel_aspect=%d/%d",
  
                      data_ctx->width, data_ctx->height, data_ctx->pix_fmt,
  
                      data_ctx->time_base.num, data_ctx->time_base.den,
  
                      data_ctx->sample_aspect_ratio.num, data_ctx->sample_aspect_ratio.den);
  
  
  
      log(Info, "Setting filter input with %s", args);
  
  
  
  
  
      if (avfilter_graph_create_filter(&buffersrc_ctx, buffersrc, "in", args, NULL, filter_graph) < 0) {
  
           throw error("Cannot create buffer source\n");
  
      }
  
  
  
      filterOutputs = avfilter_inout_alloc();
  
      filterOutputs->name       = av_strdup("in");
  
      filterOutputs->filter_ctx = buffersrc_ctx;
  
      filterOutputs->pad_idx    = 0;
  
      filterOutputs->next       = NULL;
  
  
  
      if ((avfilter_graph_parse(filter_graph, filter_desc.c_str(), filterInputs, filterOutputs, NULL)) < 0)
  
              log(Warning,"Could not parse input filters");
  
  
  
      if ((avfilter_graph_config(filter_graph, NULL)) < 0)
  
          log(Warning,"Could not configure filter graph");
  
  
  
  }

  And the process

  AVFrame * MyFilter::process(AVFrame *inFrame){
  
  
  
      if (av_buffersrc_add_frame_flags(buffersrc_ctx, inFrame->get(), AV_BUFFERSRC_FLAG_PUSH | AV_BUFFERSRC_FLAG_KEEP_REF ) < 0) {
  
           throw error("Error while feeding the filtergraph\n");
  
       }
  
  
  
      int i = 0;
  
      AVFrame* outFrame =  av_frame_alloc();
  
      if( av_buffersink_get_frame(buffersink_ctx, outFrame) < 0 ){
  
       throw error("Couldnt find a frame\n");
  
      }
  
    return outFrame;
  
  }

  And the filter I’m using is :

   std::string filter_desc = "transpose=cclock"

  As an extra note, it seems like the top bar(visible in the screen capture above) is actually composed of properly rotated pixels, and this works for the whole video. It just degrades for the remaining 99% of pixels.

  EDIT :

  Using this works std::string filter_desc = "rotate=1.58", but then the resolution is not properly shifted.