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• FFmpeg NaCl module avformat_open_input (on rtsp stream) returns -5 : I/O error

  8 janvier 2016, par Taimoor Alam

  I want to create an RTSP player in Chrome PNaCl.

  I have successfully built the ffmpeg naclport including the following networking flags in the build.sh file for the ffmpeg NaCl port.

  —enable network —enable-protocols —enable-demuxer=rtsp —enable-demux=rtp —enable-demuxer=sdp —enable-decoder=h264

  Furthermore, I have successfully coded and the linked the ffmpeg NaCl port in my own PNaCl module. I have included the following network permissions in the manifest.json file :

  "permissions": [
  
  {
  
      "socket": [
  
          "tcp-listen:*:*", 
  
          "tcp-connect:*:*", 
  
          "resolve-host:*:*", 
  
          "udp-bind:*:*", 
  
          "udp-send-to:*:*"
  
      ],
  
  }

  Now once I run the following code, in PNaCl, the avformat_open_input(...) returns -5 or I/O Error :

      AVFormatContext* formatContext = avformat_alloc_context();
  
  
  
      av_register_all();
  
  
  
      avformat_network_init();
  
  
  
      const char * stream_path = "rtsp://184.72.239.149/vod/mp4:BigBuckBunny_115k.mov";
  
  
  
      int result = avformat_open_input(&formatContext, stream_path ,NULL,NULL);
  
  
  
      if(result< 0){
  
  
  
          PostMessage("input not opened, result: ");
  
  
  
          PostMessage(result);
  
  
  
      }else{
  
  
  
        PostMessage(std::string("input successfully opened"));
  
  
  
      }

  What am I possibly doing wrong, and why can’t the PNaCl module access the RTSP stream ?

  PS. This is a similar question, but it gives no definitive answer.

• mergeToFile returns null

  4 avril 2020, par Andrew Roberts

  I am trying to use fluent ffmpeg to merge a bunch of audio files into a single file, yet I keep recieving an error that the output is null/ doesn't exist.
My code :

  



       var ffmpeg = require("fluent-ffmpeg");
     var command = ffmpeg();
     for (var inputPath of filePaths) {
        command.addInput(inputPath);
        console.log("Added path:" + inputPath);
    }
    command
        .on('error', (err) => {
            console.log('An error occurred: ' + err.message);
        })
        .on('end', () => {
            console.log('Merging finished !');
        })
        .mergeToFile(path.join(os.tmpdir(), "result.mp3"), os.tmpdir());


  



  Error code :

  



  


  Read Error : Error : ENOENT : no such file or directory, open '/tmp/result.mp3'

  


  


• JavaCV - How to handle cases where FFmpegFrameFilter.pull() returns null

  20 juin 2018, par Gensoukyou1337

  Currently I have the basic workflow of pulling frames from one video using FFmpegFrameGrabber, filtering them using an FFmpegFrameFilter, and recording them in an FFmpegFrameRecorder, as follows :

              framesLen = vCap.getLengthInFrames();
  
              try {
  
                  Frame f;
  
                  for(int i = 0; i < framesLen; i++) {
  
                      f = vCap.grab();
  
                      if(f != null) {
  
                          vFilter.push(f);
  
                          Frame filtered;// = vFilter.pull();
  
                          vRec.setFrameNumber(i);
  
                          while((filtered = vFilter.pull()) != null) {
  
                              Log.i("ffmpeg_recorder", "processing frame "+i +" "+f+" "+filtered);
  
                              vRec.record(filtered);
  
                          }
  
                          i++;
  
                      }
  
                  }
  
              } catch (FFmpegFrameGrabber.Exception e) {
  
                  exception = e;
  
              } catch (FFmpegFrameRecorder.Exception e) {
  
                  exception = e;
  
              } catch (FFmpegFrameFilter.Exception e) {
  
                  exception = e;
  
              }
  
  
  
              try {
  
                  vCap.flush();
  
                  vCap.release();
  
                  vRec.stop();
  
                  vRec.release();
  
              } catch (FFmpegFrameGrabber.Exception e) {
  
                  exception = e;
  
              } catch (FFmpegFrameRecorder.Exception e) {
  
                  exception = e;
  
              }
  
  
  
              if (exception != null) {
  
                  Log.e("ffmpeg_exception", exception.getMessage()+"");
  
                  return null;
  
              } else {
  
                  return outFile+"";
  
              }

  My current problem is that sometimes FFmpegFrameFilter.pull() would return null in that loop, ending with vRec recording a null frame, causing the final video to get stuck for a few seconds in the same frame.

  What’s happening in the FFmpegFrameFilter when its pull() returns null ? Is it the case when I try to pull() when it hasn’t finished processing the current frame ? If that’s so, should I just put an empty while loop like this ?

  ...
  
  while((filtered = vFilter.pull()) == null) {/*block until it's NOT null*/}
  
  vRec.record(filtered);
  
  ...

  EDIT :

  OK, my proposed solution above doesn’t work - it just goes into an infinite loop. Though I really don’t want to skip those frames.