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• avformat_open_input cannot open a file with raw opus audio data

  4 novembre 2020, par bbdd

  I have a problem when trying to open a binary file containing raw audio data in opus format. When I try to open this file, the library returns an error : Unknown input format : opus.

  


  How can I open this file ?

  


  I need to open it and write all the raw audio data to an audio container. I understand that the opus format is intended only for encoding. I realized this using command :

  


  $ ffmpeg -formats | grep Opus

ffmpeg version 3.4.4 Copyright (c) 2000-2018 the FFmpeg developers
  E opus Ogg Opus # For only encoding


  


  Then what format should I use to open this file ? With ogg ? I tried, but there are also problems with opening the outgoing file. I provide the code that shows only the necessary part to open the file :

  


  int main(int argc, char *argv[])
{
    // ...

    av_register_all();

    AVFormatContext *iFrmCtx = nullptr;
    AVFormatContext *oFrmCtx = nullptr;
    AVPacket packet;

    const char *iFilename = "opus.bin"; // Raw audio data with `opus` format
    const char *oFilename = "opus.mka"; // Audio file with `opus` audio format

    AVDictionary* frmOpts = nullptr;
    const qint32 smpRateErrorCode = av_dict_set_int(&frmOpts, "sample_rate", 8000,  0);
    const qint32 bitRateErrorCode = av_dict_set_int(&frmOpts, "bit_rate",    64000, 0);
    const qint32 channelErrorCode = av_dict_set_int(&frmOpts, "channels",    2,     0);
    if (smpRateErrorCode < 0 ||
            bitRateErrorCode < 0 ||
                channelErrorCode < 0) {
        return EXIT_FAILURE;
    }

    AVInputFormat *iFrm = av_find_input_format("opus"); // Error: Unknown input format
    if (iFrm == nullptr) {
        av_dict_free(&frmOpts);
        return EXIT_FAILURE;
    }

    qint32 ret = 0;
    if ((ret = avformat_open_input(&iFrmCtx, iFilename, iFrm, &frmOpts)) < 0) {
        av_dict_free(&frmOpts);
        return EXIT_FAILURE;
    }

    // We're doing something...
}


  


• create video from images with animation

  3 janvier 2020, par zuiluo

  I have ten images to create a video with animation , like that
  https://youtu.be/iu9uazolcC8

  it use freeImage and FFmpeg.

      MovieWriter writer(fileName, IMG_WIDTH, IMG_HEIGHT);
  
          vector ls = {
  
   "D:/createVideo/src/c/1.jpg",
  
   "D:/createVideo/src/c/2.jpg",
  
   "D:/createVideo/src/c/3.jpg",
  
   "D:/createVideo/src/c/4.jpg",
  
   "D:/createVideo/src/c/5.jpg",
  
   "D:/createVideo/src/c/6.jpg",
  
   "D:/createVideo/src/c/7.jpg",
  
   "D:/createVideo/src/c/8.jpg",
  
   "D:/createVideo/src/c/9.jpg",
  
   "D:/createVideo/src/c/10.jpg",
  
  };
  
          FREE_IMAGE_FORMAT pic_type = FIF_JPEG;
  
          FIBITMAP *fiCopy = NULL;
  
          FIBITMAP *corpImg = NULL;
  
          uint8_t *ut = NULL;
  
          for (int i=0;i<10;i++)
  
          {
  
              char *src_pic_path = ls[i];
  
  
  
              FIBITMAP *fi = FreeImage_Load(pic_type, src_pic_path);
  
  
  
              if(fi==NULL){
  
                  continue;
  
              }
  
              int w = IMG_WIDTH;
  
              int h = IMG_HEIGHT;
  
              unsigned int index = 0;
  
  
  
              while (w > IMG_MIN_W_SCALE || h > IMG_MIN_H_SCALE)
  
              {       
  
                  fiCopy = FreeImage_RescaleRect(fi,  IMG_WIDTH, IMG_HEIGHT,0, 0, w * 2, h * 2);
  
                  if(fiCopy == NULL){
  
                      break;
  
                  }
  
                  corpImg = FreeImage_Rescale(fiCopy, IMG_WIDTH, IMG_HEIGHT);
  
                  if(corpImg == NULL){
  
                      break;
  
                  }
  
                  ut = FreeImage_GetBits(corpImg);
  
                  if(ut == NULL){
  
                      break;
  
                  }
  
                  w -= ONE_W_PIECE;
  
                  h -= ONE_H_PIECE;
  
                  writer.addFrame(ut);
  
                  FreeImage_Unload(corpImg);
  
                  FreeImage_Unload(fiCopy);
  
                  index++;
  
              }
  
          }

  but it so slowly, how to optimization that code ? or how to faster to create that video ?

  would you know about an option to do that ?

• Windows libs for ffmpeg don't link (visual studio) ?

  21 octobre 2013, par Chad Mourning

  So, I'm trying to get a project I'm writing to link against ffmpeg libraries but I keep getting linker errors :

  1>GLViewLASReader.obj : error LNK2001: unresolved external symbol "struct AVCodec * __cdecl avcodec_find_encoder(enum AVCodecID)" (?avcodec_find_encoder@@YAPEAUAVCodec@@W4AVCodecID@@@Z)
  
  1>GLViewLASReader.obj : error LNK2001: unresolved external symbol "int __cdecl av_dict_set(struct AVDictionary * *,char const *,char const *,int)" (?av_dict_set@@YAHPEAPEAUAVDictionary@@PEBD1H@Z)
  
  1>GLViewLASReader.obj : error LNK2001: unresolved external symbol "int __cdecl avcodec_encode_video(struct AVCodecContext *,unsigned char *,int,struct AVFrame const *)" (?avcodec_encode_video@@YAHPEAUAVCodecContext@@PEAEHPEBUAVFrame@@@Z)
  
  1>GLViewLASReader.obj : error LNK2001: unresolved external symbol "struct AVCodecContext * __cdecl avcodec_alloc_context3(struct AVCodec const *)" (?avcodec_alloc_context3@@YAPEAUAVCodecContext@@PEBUAVCodec@@@Z)
  
  1>GLViewLASReader.obj : error LNK2001: unresolved external symbol "struct AVFrame * __cdecl avcodec_alloc_frame(void)" (?avcodec_alloc_frame@@YAPEAUAVFrame@@XZ)
  
  1>GLViewLASReader.obj : error LNK2001: unresolved external symbol "void __cdecl av_free(void *)" (?av_free@@YAXPEAX@Z)
  
  1>GLViewLASReader.obj : error LNK2001: unresolved external symbol "int __cdecl avcodec_open2(struct AVCodecContext *,struct AVCodec const *,struct AVDictionary * *)" (?avcodec_open2@@YAHPEAUAVCodecContext@@PEBUAVCodec@@PEAPEAUAVDictionary@@@Z)
  
  1>GLViewLASReader.obj : error LNK2001: unresolved external symbol "int __cdecl avcodec_close(struct AVCodecContext *)" (?avcodec_close@@YAHPEAUAVCodecContext@@@Z)
  
  1>C:\STEAMiE\usr\modules\LASReader\win32\Release\LASReader.exe : fatal error LNK1120: 8 unresolved externals

  I downloaded the dev package from :

  http://ffmpeg.zeranoe.com/builds/

  But when I link against the libs like I normally would, I get the linker errors. Is this package somehow different from every other library I've tried to use that I just need the .h/.libs for ? Is there a reason why it has to be that way ?