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• "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.

  


• How to plot animated time series in R ?

  28 août 2016, par pOrlando

  I am trying use the ’animation’ package in R to plot an animated time series.

  My dataset consists of a time vector and a value vector, each with 1800 rows.

  I keep getting an error message after running the loop which reads :

  Error in jpeg(gname[i]) : unable to start jpeg() device
  
  In addition: Warning messages:
  
  1: In jpeg(gname[i]) : unable to open file 'g11:30:00.jpg' for writing
  
  2: In jpeg(gname[i]) : opening device failed

  Here’s the source code

  timemax<-1800
  
  setwd("~/Documents/Animation/")
  
  graphdata<-read.csv("filling_line_data_construction_v2.csv")
  
  attach(graphdata)
  
  gname<-paste("g",time, ".jpg", sep="")
  
  for (i in 1:timemax){
  
      jpeg(gname[i])
  
      plot(time[1],value[1],type="l",ylim=c(0,35), xlim=c(0,100),
  
        ylim = c(0, 35),ylab = "", xlab="time")
  
      lines(time[1:i],value[1:i])
  
      dev.off(dev.cur())
  
  }

  The end goal is to string together these 1800 plots as a stop animation video by calling the ffmpeg shell :

  shell("C:/ffmpeg/bin/ffmpeg.exe -report -i g%d.jpg -b:v 2048k fillin_lineR.mpg",mustWork=FALSE)

  This is code that I’ve been trying to adapt from http://www.animatedgraphs.co.uk/LondonR.html#slide-30, but this example uses a .tif file instead of .jpg, and my computer gives me 1800 error messages when trying to make a video from .tif files...

  Thanks in advance !

• Revision 2baccb18a0 : Use less tmp motion vectors in vp9_pick_inter_mode_sub8x8 This commit simplifie

  30 décembre 2014, par Jingning Han

  Changed Paths :
   Modify /vp9/encoder/vp9_pickmode.c

  
  
  Use less tmp motion vectors in vp9_pick_inter_mode_sub8x8

  This commit simplifies the reference motion vector part for sub8x8
  block coding in RTC mode and reduces the required local variables.

  Change-Id : I470d1482092563b68af22404dc1f497e7457b0a8