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• FFmpeg error - "at least one output file must be specified" [closed]

  1er février 2018, par Derrick Tucker

  ffmpeg -ss 0 -i rawvid.flv -t 33 -vf scale=640x480 -b:21504 test.mpg

  When run, this returns "At least one output file must be specified", what am I missing ?

  PS : FFmpeg works fine, and if I remove all of the flags in the statement above, it works.

• 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;
  
  }

• java.lang.UnsatisfiedLinkError couldn't find "libavcore.so"runtime error

  12 décembre 2017, par Shivani Vasundhara

  I am using FFmpegExample and have included pre compiled .so files.There are only 2 CPU structure .so files. "armeabi" and "armeabi-v7a".I already added below code in build.gradle file of app module.It didn’t worked for me.

   ndk {
  
          abiFilters "armeabi","armeabi-v7a"
  
      }

  I am getting this error message :