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• FFmpeg giving a wierd "Permission denied" error (Digitalocean VPS Ubuntu 18.04)

  10 mai 2021, par DJ Danny

  I've set up a VPS server on Digitalocean. Installed Ubuntu 18.04, LAMP, etc.
Finally, I installed ffmpeg. It is working fine from terminal but when I try to execute it through php it gives a weird "Permission denied" error :

  


  Here is some information :

  
root@vl :/# whereis ffmpeg
  
ffmpeg : /usr/local/bin/ffmpeg
  
root@vl :/# whereis ffprobe
  
ffprobe : /usr/local/bin/ffprobe
  

  


  root@vl :/# ffmpeg -version
  
ffmpeg version N-102461-g8649f5dca6 Copyright (c) 2000-2021 the FFmpeg developers
built with gcc 7 (Ubuntu 7.5.0-3ubuntu1 18.04)
configuration : —prefix=/usr/local/ffmpeg_build —pkg-config-flags=—static —extra-cflags=-I/usr/local/ffmpeg_build/include —extra-ldflags=-L/usr/local/ffmpeg_build/lib —extra-libs='-lpthread -lm' —ld=g++ —bindir=/usr/local/bin —enable-gpl —enable-gnutls —enable-libaom —enable-libass —enable-libfdk-aac —enable-libfreetype —enable-libmp3lame —enable-libopus —enable-libsvtav1 —enable-libvorbis —enable-libvpx —enable-libx264 —enable-libx265 —enable-nonfree
libavutil 57. 0.100 / 57. 0.100
libavcodec 59. 1.100 / 59. 1.100
libavformat 59. 0.101 / 59. 0.101
libavdevice 59. 0.100 / 59. 0.100
libavfilter 8. 0.101 / 8. 0.101
libswscale 6. 0.100 / 6. 0.100
libswresample 4. 0.100 / 4. 0.100
libpostproc 56. 0.100 / 56. 0.100


  


  My php file :
  

  

echo shell_exec("ffmpeg -i mj.gif -profile:v baseline -pix_fmt yuv420p -vf scale=600 :-2 output.mp4 2>&1")
  
 ?>

  


  The ERROR ! :
  
ffmpeg version N-102461-g8649f5dca6 Copyright (c) 2000-2021 the FFmpeg developers built with gcc 7 (Ubuntu 7.5.0-3ubuntu1 18.04) configuration : —prefix=/usr/local/ffmpeg_build —pkg-config-flags=—static —extra-cflags=-I/usr/local/ffmpeg_build/include —extra-ldflags=-L/usr/local/ffmpeg_build/lib —extra-libs='-lpthread -lm' —ld=g++ —bindir=/usr/local/bin —enable-gpl —enable-gnutls —enable-libaom —enable-libass —enable-libfdk-aac —enable-libfreetype —enable-libmp3lame —enable-libopus —enable-libsvtav1 —enable-libvorbis —enable-libvpx —enable-libx264 —enable-libx265 —enable-nonfree libavutil 57. 0.100 / 57. 0.100 libavcodec 59. 1.100 / 59. 1.100 libavformat 59. 0.101 / 59. 0.101 libavdevice 59. 0.100 / 59. 0.100 libavfilter 8. 0.101 / 8. 0.101 libswscale 6. 0.100 / 6. 0.100 libswresample 4. 0.100 / 4. 0.100 libpostproc 56. 0.100 / 56. 0.100 Input #0, gif, from 'mj.gif' : Duration : 00:00:01.60, start : 0.000000, bitrate : 22863 kb/s Stream #0:0 : Video : gif, bgra, 1400x1050, 10 fps, 10 tbr, 100 tbn output.mp4 : Permission denied


  
From the past 24 hours I've tried installing ffmpeg in different ways (compiling & apt install), I've also tried changing the permission but still I'm stuck with this error.
  
Any help would be highly appreciated !
  
Thanks

  


• "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.

  


• ERROR : "Cannot Find FFMPEG" on Google Cloud Compute Engine Debian Wheezy 7.8 Managed Instance even though it's installed

  17 mai 2021, par DynamoBooster

  I wrote a Node.JS application that uses the fluent-ffmpeg module to watermark videos uploaded on the platform. I pushed the code to a my Google Cloud Compute Engine project, and every time I get Error : Cannot Find FFMPEG. I ssh'd into the instance once it was created and ran these commands to install FFMPEG before actually testing out the code. I am not sure what is causing the error because after this I am positive that FFMPEG is installed.

  



  sudo apt-get update
sudo apt-get install -y ffmpeg
export FFMPEG_PATH="/usr/bin/ffmpeg"
export FFPROBE_PATH="/usr/bin/ffprobe"


  



  Below is my FFMPEG code

  



  function generate_thumbnail(name, path){
  logging.info("Generating Thumbnail");
  ffmpeg(path)
   .setFfmpegPath('/usr/bin/ffmpeg') 
   .setFfprobePath('/usr/bin/ffprobe')
   .on('end', function() {
        upload_thumbnail(name);
        logging.info("Thumbnail Generated and uploaded");
        return;
    })
  .on('error', function(err, stdout, stderr) {
        logging.info('ERROR: ' + err.message);
        logging.info('STDERR:' + stderr);
  })
  .on('start', function(commandLine) {
       logging.info(commandLine);
  })
  .screenshots({
    count: 1,
    filename: name + '_thumbnail.png',
    folder: 'public/images/thumbnails/'
  });
}