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• avcodec_open2 error -542398533 : "Generic error in an external library"

  15 février 2017, par bot1131357

  I am encountering an error when trying to open the codec with avcodec_open2(). I have tried the same code without any problems if I specify avi instead of h264 in the av_guess_format() function.

  I don’t know what to make of it. Has anyone else encountered a similar problem ?

  The library that I’m using is ffmpeg-20160219-git-98a0053-win32-dev. I would really really appreciate if you could help me out of this confusion.

  This is my console output :

  Video encoding
  [libx264 @ 01383460] broken ffmpeg default settings detected
  [libx264 @ 01383460] use an encoding preset (e.g. -vpre medium)
  [libx264 @ 01383460] preset usage : -vpre -vpre
  [libx264 @ 01383460] speed presets are listed in x264 —help
  [libx264 @ 01383460] profile is optional ; x264 defaults to high
  Cannot open video codec, -542398533

  This is the code that I’m working with :

  // Video encoding sample
  
  AVCodec *codec = NULL;
  
  AVCodecContext *codecCtx= NULL;
  
  AVFormatContext *pFormatCtx = NULL;
  
  AVOutputFormat *pOutFormat = NULL;
  
  AVStream * pVideoStream = NULL;;
  
  AVFrame *picture = NULL;;
  
  
  
  int i, x, y, ret;
  
  
  
  printf("Video encoding\n");
  
  
  
  // Register all formats and codecs
  
  av_register_all();
  
  
  
  // guess format from file extension
  
  pOutFormat = av_guess_format("h264", NULL, NULL);
  
  if (NULL==pOutFormat){
  
      cerr << "Could not guess output format" << endl;
  
      return -1;
  
  }   
  
  
  
  // allocate context
  
  pFormatCtx = avformat_alloc_context();
  
  pFormatCtx->oformat = pOutFormat;
  
  memcpy(pFormatCtx->filename,filename,
  
      min(strlen(filename), sizeof(pFormatCtx->filename)));
  
  
  
  // Add stream to pFormatCtx
  
  pVideoStream = avformat_new_stream(pFormatCtx, 0);
  
  if (!pVideoStream) 
  
  {
  
      printf("Cannot add new video stream\n");
  
      return -1;
  
  }
  
  
  
  // Set stream's codec context
  
  codecCtx = pVideoStream->codec;
  
  codecCtx->codec_id = (AVCodecID)pOutFormat->video_codec;
  
  codecCtx->codec_type = AVMEDIA_TYPE_VIDEO;
  
  codecCtx->frame_number = 0;
  
  // Put sample parameters.
  
  codecCtx->bit_rate = 2000000;
  
  // Resolution must be a multiple of two.
  
  codecCtx->width  = 320;
  
  codecCtx->height = 240;
  
  codecCtx->time_base.den = 10;
  
  codecCtx->time_base.num = 1;
  
  pVideoStream->time_base.den = 10;
  
  pVideoStream->time_base.num = 1;
  
  codecCtx->gop_size = 12; // emit one intra frame every twelve frames at most
  
  codecCtx->pix_fmt = AV_PIX_FMT_YUV420P;
  
  
  
  if (codecCtx->codec_id == AV_CODEC_ID_H264)
  
  {
  
      // Just for testing, we also add B frames 
  
      codecCtx->mb_decision = 2;
  
  }
  
  // Some formats want stream headers to be separate.
  
  if(pFormatCtx->oformat->flags & AVFMT_GLOBALHEADER)
  
  {
  
      codecCtx->flags |= CODEC_FLAG_GLOBAL_HEADER;
  
  }
  
  
  
  if(codecCtx->codec_id == AV_CODEC_ID_H264)
  
      av_opt_set(codecCtx->priv_data, "preset", "slow", 0);
  
  
  
  
  
  // Open the codec.
  
  codec = avcodec_find_encoder(codecCtx->codec_id);
  
  if (codec == NULL) {
  
      fprintf(stderr, "Codec not found\n");
  
      return -1;
  
  }
  
  ret = avcodec_open2(codecCtx, codec, NULL); // returns -542398533 here
  
  if (ret < 0) 
  
  {
  
      printf("Cannot open video codec, %d\n",ret);
  
      return -1;
  
  }

• Source of random Fatal signal 11 (SIGSEGV) error in app using ffmpeg through ndk

  20 janvier 2015, par grzebyk

  I am getting a nasty but well known error while working with FFmpeg and NDK :

  A/libc(9845): Fatal signal 11 (SIGSEGV), code 1, fault addr 0xa0a9f000 in tid 9921 (AsyncTask #4)

  What am I doing ?

  I am developing an application that streams live video feed from a webcam and enables user to pan and tilt the remote camera. I am using FFmpeg library built with NDK to achieve smooth playback with little delay.

  I am using FFMpeg library to connect to the video stream. Then the ndk part creates bitmap, does the image processing and render frames on the SurfaceView videoSurfaceView object which is located in the android activity (java part).

  To move the webcam I created a separate class - public class CameraMover implements Runnable{/**/}. This class is a separate thread that connects through sockets with the remote camera and manages tasks connected ONLY with pan-tilt movement.

  Next in the main activity i created a touch listener

  videoSurfaceView.setOnTouchListener(new View.OnTouchListener() {/**/
  
  cameraMover.setPanTilt(some parameters);
  
  /**/}

  which reads user’s finger movement and sends commands to the camera.

  All tasks - moving camera around, touch interface and video playback are working perfectly when the one of the others is disabled, i.e. when I disable possibility to move camera, I can watch video streaming and register touch events till the end of time (or battery at least). The problem occurs only when task are configured to work simultaneously.

  I am unable to find steps to reproduce the problem. It just happens, but only after user touches the screen to move camera. It can be 15 seconds after first interaction, but sometimes it takes app 10 or more minutes to crash. Usually it is something around a minute.

  What have I done to fix it ?

  • I tried to display millions of logs in logcat to find an error but
    the last log was always different.
  • I created a transparent surface, that I put over the videoSurfaceView and assigned touch listener to it. It all ended in the same error.
  • As I mentioned before, I turned off some functionalities to find which one produces the error, but it appears that error occurs only when everything is working simultaneously.

  Types of the error

  Almost every time the error looks like this :

  A/libc(11528): Fatal signal 11 (SIGSEGV), code 1, fault addr 0x9aa9f00c in tid 11637 (AsyncTask #4)

  the difference between two errors is the number right after libc, addr number and tid number. Rarely the AsyncTask number varies - i received #1 couple times but I was unable to reproduce it.

  Question

  How can i avoid this error ? What can be the source of it ?

• Decoding .mp3 with ffmpeg

  17 juin 2013, par user2492388

  I want to decode an mp3-File with the ffmpeg library.

      #include 
  
      #include <libavutil></libavutil>opt.h>
  
      #include <libavcodec></libavcodec>avcodec.h>
  
      #include <libavutil></libavutil>channel_layout.h>
  
      #include <libavutil></libavutil>common.h>
  
      #include <libavutil></libavutil>imgutils.h>
  
      #include <libavutil></libavutil>mathematics.h>
  
      #include <libavutil></libavutil>samplefmt.h>
  
  
  
      #define INBUF_SIZE 4096
  
      #define AUDIO_INBUF_SIZE 20480
  
      #define AUDIO_REFILL_THRESH 4096
  
  
  
      static void audio_decode_example(const char *outfilename, const char *filename)
  
      {
  
          AVCodec *codec;
  
          AVCodecContext *c= NULL;
  
          int len;
  
          FILE *f, *outfile;
  
          uint8_t inbuf[AUDIO_INBUF_SIZE + FF_INPUT_BUFFER_PADDING_SIZE];
  
          AVPacket avpkt;
  
          AVFrame *decoded_frame = NULL;
  
  
  
          av_init_packet(&amp;avpkt);
  
  
  
          printf("Decode audio file %s to %s\n", filename, outfilename);
  
  
  
          /* find the mpeg audio decoder */
  
          codec = avcodec_find_decoder(AV_CODEC_ID_MP3);
  
          if (!codec) {
  
              fprintf(stderr, "Codec not found\n");
  
              exit(1);
  
          }
  
  
  
          c = avcodec_alloc_context3(codec);
  
          if (!c) {
  
              fprintf(stderr, "Could not allocate audio codec context\n");
  
              exit(1);
  
          }
  
  
  
          /* open it */
  
          if (avcodec_open2(c, codec, NULL) &lt; 0) {
  
              fprintf(stderr, "Could not open codec\n");
  
              exit(1);
  
          }
  
  
  
          f = fopen(filename, "rb");
  
          if (!f) {
  
              fprintf(stderr, "Could not open %s\n", filename);
  
              exit(1);
  
          }
  
          outfile = fopen(outfilename, "wb");
  
          if (!outfile) {
  
              av_free(c);
  
              exit(1);
  
          }
  
  
  
          /* decode until eof */
  
          avpkt.data = inbuf;
  
          avpkt.size = fread(inbuf, 1, AUDIO_INBUF_SIZE, f);
  
  
  
          while (avpkt.size > 0) {
  
              int got_frame = 0;
  
  
  
              if (!decoded_frame) {
  
                  if (!(decoded_frame = avcodec_alloc_frame())) {
  
                      fprintf(stderr, "Could not allocate audio frame\n");
  
                      exit(1);
  
                  }
  
              } else
  
                  avcodec_get_frame_defaults(decoded_frame);
  
  
  
              len = avcodec_decode_audio4(c, decoded_frame, &amp;got_frame, &amp;avpkt);
  
              if (len &lt; 0) {
  
                  fprintf(stderr, "Error while decoding\n");
  
                  exit(1);
  
              }
  
              if (got_frame) {
  
                  /* if a frame has been decoded, output it */
  
                  int data_size = av_samples_get_buffer_size(NULL, c->channels,
  
                                                             decoded_frame->nb_samples,
  
                                                             c->sample_fmt, 1);
  
                  fwrite(decoded_frame->data[0], 1, data_size, outfile);
  
              }
  
              avpkt.size -= len;
  
              avpkt.data += len;
  
              avpkt.dts =
  
              avpkt.pts = AV_NOPTS_VALUE;
  
              if (avpkt.size &lt; AUDIO_REFILL_THRESH) {
  
                  memmove(inbuf, avpkt.data, avpkt.size);
  
                  avpkt.data = inbuf;
  
                  len = fread(avpkt.data + avpkt.size, 1,
  
                              AUDIO_INBUF_SIZE - avpkt.size, f);
  
                  if (len > 0)
  
                      avpkt.size += len;
  
              }
  
          }
  
  
  
          fclose(outfile);
  
          fclose(f);
  
  
  
          avcodec_close(c);
  
          av_free(c);
  
          avcodec_free_frame(&amp;decoded_frame);
  
      }
  
  
  
  
  
      int main(int argc, char **argv)
  
      {
  
          const char* filename;
  
  
  
          /* register all the codecs */
  
          avcodec_register_all();
  
  
  
          filename = argv[1];
  
  
  
          audio_decode_example("ausgabe.sw", filename);
  
  
  
          return 0;
  
      }

  And here is my problem : When i start my program, the decoding from the mp3-File into this raw data file succeed with no problem. But when I play this output file with my Alsa driver I have an distorted sound, its the original sound, but i sounds like the smurfs and its distorted.
  Have anyone here an idea ? The Code is from the original encoding_decoding.c example from ffmpeg. The only thing I changed is the AV_CODEC_ID, because I need .mp3.
  Sorry for my partially bad englisch.