Hey getting this error: stream.c:65:14: warning: implicit declaration of function 'av_image_get_buffer_size' is invalid in C99 [-Wimplicit-function-declaration]

[lucas-aragno]

I'm following the tutorial (updating things bc some of the methods/properties where deprecated )

#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
#include <stdlib.h>
// #include <ffmpeg/swscale.h>

// How to compile it: gcc -o stream stream.c -lavutil -lavformat -lavcodec -lz -lavutil -lm
// How to run it ./stream <video>

int main (int argc, char * argv []) {
  av_register_all();
  AVFormatContext * pFormatCtx = NULL;

  // Open a video file
  if (avformat_open_input(&pFormatCtx, argv[1], NULL, 0) != 0)
    return -1; // Couldn't open the file
  if (avformat_find_stream_info(pFormatCtx, NULL) < 0)
    return -1; // Counldn't find the stream
  int i;
  int videoStream;
  AVCodecContext * pCodecCtxOrig = NULL;
  AVCodecParameters * pCodecCtx = NULL;
  AVCodecContext * pCodecRealCtx = NULL;

  videoStream = -1;
  // pFormatCtx->streams is an array of pointers
  // of size pFormatCtx->nb_strams
  for (i = 0; i < pFormatCtx->nb_streams; i++)
    if (pFormatCtx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
      videoStream=i;
      break;
    }
  if (videoStream == -1)
    return -1;

  // get the pointer to the codec context for the video stream
  pCodecCtx = pFormatCtx->streams[videoStream]->codecpar;

  AVCodec *pCodec = NULL;
  // Find the decoder for the video stream
  pCodec = avcodec_find_decoder(pCodecCtx->codec_id);

  if (pCodec == NULL) {
    fprintf(stderr, "Unsupported Codec \n");
    return -1; // Codec not found
  }

  // Open Codec
  avcodec_parameters_to_context(pCodecRealCtx, pCodecCtx);
  if (avcodec_open2(pCodecRealCtx, pCodec, NULL) < 0)
    return -1;

  AVFrame *pFrame = NULL;
  AVFrame *pFrameRGB = NULL;

  // Allocate video frame
  pFrame = av_frame_alloc();
  pFrameRGB = av_frame_alloc();

  if (pFrameRGB == NULL)
    return -1;

  uint8_t *buffer = NULL;

  int numBytes;

  // numBytes = av_image_get_buffer_size(AV_PIX_FMT_RGB24, pCodecCtx->width, pCodecCtx->height, 0);
  return 0;
}

this is my code for now but for numBytes = av_image_get_buffer_size(AV_PIX_FMT_RGB24, pCodecCtx->width, pCodecCtx->height, 0); I get:

stream.c:65:14: warning: implicit declaration of function 'av_image_get_buffer_size' is invalid in C99 [-Wimplicit-function-declaration]

but it should be defined on the imports right? based on this

[lucas-aragno]

found that i had to include this header #include <libavutil/imgutils.h> closing this now :)