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• AWS Lambda. Error=20 (Not a directory) when moving FFmpeg to /tmp

  18 novembre 2017, par Omar Riaz

  I am using the ffmpeg-cli-wrapper to run FFmpeg from an application I upload onto AWS lambda. I was initially getting the

  error=13 Permission Denied

  when trying to call it via the wrappers ProcessBuilder. My inital solution was to chmod 755 ffmpeg before uploading, but it didn’t help.

  For information, my FFmpeg and ffprobe files are located in the following classpath : static/ffmpeg/ffmpeg and static/ffmpeg/ffprobe. They are also statically linked.

  AWS Lambda permission denied when trying to use ffmpeg

  I’ve tried to follow the instructions given in the example above, but when I try to perform either mv or cp command :Runtime.exec("mv " + pathToFFmpeg + " /tmp"), I get the

  error=20, Not a directory

  error.

  I know that I have the correct path for FFmpeg because the following command mv *pathToFFmpeg* *an arbitrary name* runs without error, meaning that the file is there and so the mv command just renames it as it’s supposed to do.

• Couldn't run a ffmpeg process by using supervisor [on hold]

  11 août 2019, par Ahmad

  This issue seems to be weird, at least for me.

  I’m trying to run a ffmpeg process using the supervisor as follows :

  [program:myprocessname]
  
  command="/usr/bin/ffmpeg -loglevel quiet -i ..."
  
  process_name=%(program_name)s
  
  numprocs=1
  
  umask=022
  
  priority=999
  
  autostart=true
  
  autorestart=unexpected
  
  startretries=3
  
  exitcodes=0
  
  stopsignal=TERM
  
  stopwaitsecs=10
  
  user=vagrant

  This program never gets run, in spite of changing the command to the absolute path where the FFmpeg is located.

  This is what I get (from log) when I try to run it :

  {
  
      "description": "can't find command '/usr/bin/ffmpeg -loglevel quiet -i 
  
   ...'",
  
      "exitstatus": 0,
  
      "group": "myprocessname",
  
      "logfile": "/var/log/supervisor/myprocessname-stdout---supervisor-oxWFk5.log",
  
      "name": "myprocessname",
  
      "now": 1554747933,
  
      "pid": 0,
  
      "spawnerr": "can't find command '/usr/bin/ffmpeg -loglevel quiet -i ...'",
  
      "start": 1554747575,
  
      "state": 200,
  
      "statename": "FATAL",
  
      "stderr_logfile": "/var/log/supervisor/myprocessname-stderr---supervisor-WNmJv6.log",
  
      "stdout_logfile": "/var/log/supervisor/myprocessname-stdout---supervisor-oxWFk5.log",
  
      "stop": 0
  
  }

  It might be that FFmpeg spawns processes where the supervisor couldn’t handle ?

  Any idea, please ?

• "Critical error detected c0000374" when running av_packet_unref or av_frame_unref

  15 mai 2021, par Shivang Sharma

  I am trying to read and decode frames which is happening nicely but when its reaching part of un-referencing frame or packet using av_packet_unref and av_frame_unref it is giving error during second frame or third frame sometimes .

  


  Error (Copied from visual studio output window) :

  


  Critical error detected c0000374
Libav.exe has triggered a breakpoint


  


  Here is some code of reading and decoding which is giving error :

  


  void Decoder::streamNextFrame(int type = 0)
{
    while (av_read_frame(this->fileFormatCtx, this->latestpacket) >= 0) {
        if (this->audioDecoder->activeAudioStream != nullptr) {
            if (this->latestpacket->stream_index == this->audioDecoder->activeAudioStream->index) {
                avcodec_send_packet(this->audioDecoder->activeStreamDecoder, this->latestpacket);
                err = avcodec_receive_frame(this->audioDecoder->activeStreamDecoder, this->decodedFrame);
                if (err == AVERROR(EAGAIN)) {
                    av_frame_unref(this->decodedFrame);
                    av_packet_unref(this->latestpacket);
                    continue;
                }

                {
                    int currentIndex = (int)this->audioFrames->size();
                    this->audioFrames->resize((int)this->audioFrames->size() + 1);
                    int nb = 0;
                    this->audioFrames->at(currentIndex).pts = (int)this->decodedFrame->pts;
                    if (this->audioDecoder->activeStreamDecoder->sample_fmt != AV_SAMPLE_FMT_S16) {
                        nb = 2048 * this->audioDecoder->activeStreamDecoder->channels;
                        printf("%i\n", nb);
                        this->audioFrames->at(currentIndex).data.resize(nb);
                        if (!swr_is_initialized(swr)) {

                            swr_alloc_set_opts(swr, this->audioDecoder->activeStreamDecoder->channel_layout, AV_SAMPLE_FMT_S16, this->audioDecoder->activeStreamDecoder->sample_rate, this->audioDecoder->activeStreamDecoder->channel_layout, this->audioDecoder->activeStreamDecoder->sample_fmt, this->audioDecoder->activeStreamDecoder->sample_rate, 0, nullptr);
                            swr_init(swr);
                        }

                        uint8_t* buffer = this->audioFrames->at(currentIndex).data.data();
                        swr_convert(swr, &buffer, nb, (const uint8_t**)this->decodedFrame->extended_data, this->decodedFrame->nb_samples);
                    }
                    else {
                        nb = this->decodedFrame->nb_samples * this->audioDecoder->activeStreamDecoder->channels;
                        this->audioFrames->at(currentIndex).data = std::vector(*this->decodedFrame->extended_data, *this->decodedFrame->extended_data + (uint8_t)nb);
                    }

                    this->audioFrames->at(currentIndex).buffersize = nb;
                }

                if (err == AVERROR_EOF) {
                    this->audioDecoder->streamEnded = true;
                    av_frame_unref(this->decodedFrame);
                    av_packet_unref(this->latestpacket);
                    break;
                }
                else if (err >= 0) {
                    this->audioDecoder->streamEnded = false;
                }

                if (type != 0) {
                    av_packet_unref(this->latestpacket);
                    av_frame_unref(this->decodedFrame);
                    break;
                }
                av_packet_unref(this->latestpacket);
                av_frame_unref(this->decodedFrame);
            }
        }
        else {
            printf("No active audio stream is set\n");
            if(type!=0)
            break;
        }
    }

}


  


  I have removed some of code which was concerning the video and was not giving problem I think.

  


  Some Information about above code :

  


  this->audioFrames is a pointer to vector with following type.&#xA;std::vector<audioframeformat>* "AudioFrameFormat" is struct defined as following&#xA;&#xA;struct AudioFrameFormat {&#xA;        std::vector data = {};&#xA;        int pts = 0;&#xA;        int buffersize = 0;&#xA;    };&#xA;&#xA;&#xA;swr is a private class member allocated in constructor&#xA;</audioframeformat>

  


  Call Stack looks like :

  


  

  


  I am getting from call stack is that I am not taking care of my heap memory.

  


  Can someone please explain where problem is and, why some times it run till third frame and some time till second frame of the audio stream ?

  


  And please tell how can I improve this code.