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• Libtool library used but `LIBTOOL' is undefined ?

  29 décembre 2014, par Sam Healey

  Im trying to install ffmpeg on my server. Im unsing centos 5.

  When I try to install libfdk_aac I get the following error

  ` autoreconf: Entering directory `.'
  
  autoreconf: configure.ac: not using Gettext
  
  autoreconf: running: aclocal --force -I m4
  
  autoreconf: configure.ac: tracing
  
  autoreconf: configure.ac: not using Libtool
  
  autoreconf: running: /usr/bin/autoconf --force
  
  autoreconf: configure.ac: not using Autoheader
  
  autoreconf: running: automake --add-missing --copy --force-missing
  
  Makefile.am:31: Libtool library used but `LIBTOOL' is undefined
  
  Makefile.am:31:
  
  Makefile.am:31: The usual way to define `LIBTOOL' is to add `AC_PROG_LIBTOOL'
  
  Makefile.am:31: to `configure.ac' and run `aclocal' and `autoconf' again.
  
  Makefile.am: C objects in subdir but `AM_PROG_CC_C_O' not in `configure.ac'
  
  autoreconf: automake failed with exit status: 1 ` 

  If i type which libtool I get /usr/bin/libtool, so i think libtool is installed.
  So im not sure why this error is happening.

  Thanks for any advice

• How to mention real image instead of dummy image in ffmpeg api-example.c

  2 mars 2013, par Mohan

  I am using video_encode_example function from api-example.c of FFmpeg,
  which basically creates 25 dummy images and encodes into a one second video.
  How ever i am unable to mention real images instead of dummy ones.
  If any one know how to do this for xcode objective C, pl submit a reply.
  Below is the function

  /*
  
   * Video encoding example
  
   */
  
  static void video_encode_example(const char *filename)
  
  {
  
      AVCodec *codec;
  
      AVCodecContext *c= NULL;
  
      int i, out_size, size, x, y, outbuf_size;
  
      FILE *f;
  
      AVFrame *picture;
  
      uint8_t *outbuf, *picture_buf;
  
  
  
      printf("Video encoding\n");
  
  
  
      /* find the mpeg1 video encoder */
  
      codec = avcodec_find_encoder(CODEC_ID_MPEG1VIDEO);
  
      if (!codec) {
  
          fprintf(stderr, "codec not found\n");
  
          exit(1);
  
      }
  
  
  
      c= avcodec_alloc_context();
  
      picture= avcodec_alloc_frame();
  
  
  
      /* put sample parameters */
  
      c->bit_rate = 400000;
  
      /* resolution must be a multiple of two */
  
      c->width = 352;
  
      c->height = 288;
  
      /* frames per second */
  
      c->time_base= (AVRational){1,25};
  
      c->gop_size = 10; /* emit one intra frame every ten frames */
  
      c->max_b_frames=1;
  
      c->pix_fmt = PIX_FMT_YUV420P;
  
  
  
      /* open it */
  
      if (avcodec_open(c, codec) < 0) {
  
          fprintf(stderr, "could not open codec\n");
  
          exit(1);
  
      }
  
  
  
      f = fopen(filename, "wb");
  
      if (!f) {
  
          fprintf(stderr, "could not open %s\n", filename);
  
          exit(1);
  
      }
  
  
  
      /* alloc image and output buffer */
  
      outbuf_size = 100000;
  
      outbuf = malloc(outbuf_size);
  
      size = c->width * c->height;
  
      picture_buf = malloc((size * 3) / 2); /* size for YUV 420 */
  
  
  
      picture->data[0] = picture_buf;
  
      picture->data[1] = picture->data[0] + size;
  
      picture->data[2] = picture->data[1] + size / 4;
  
      picture->linesize[0] = c->width;
  
      picture->linesize[1] = c->width / 2;
  
      picture->linesize[2] = c->width / 2;
  
  
  
      /* encode 1 second of video */
  
      for(i=0;i<25;i++) {
  
          fflush(stdout);
  
          /* prepare a dummy image */
  
          /* Y */
  
          for(y=0;yheight;y++) {
  
              for(x=0;xwidth;x++) {
  
                  picture->data[0][y * picture->linesize[0] + x] = x + y + i * 3;
  
              }
  
          }
  
  
  
          /* Cb and Cr */
  
          for(y=0;yheight/2;y++) {
  
              for(x=0;xwidth/2;x++) {
  
                  picture->data[1][y * picture->linesize[1] + x] = 128 + y + i * 2;
  
                  picture->data[2][y * picture->linesize[2] + x] = 64 + x + i * 5;
  
              }
  
          }
  
  
  
          /* encode the image */
  
          out_size = avcodec_encode_video(c, outbuf, outbuf_size, picture);
  
          printf("encoding frame %3d (size=%5d)\n", i, out_size);
  
          fwrite(outbuf, 1, out_size, f);
  
      }
  
  
  
      /* get the delayed frames */
  
      for(; out_size; i++) {
  
          fflush(stdout);
  
  
  
          out_size = avcodec_encode_video(c, outbuf, outbuf_size, NULL);
  
          printf("write frame %3d (size=%5d)\n", i, out_size);
  
          fwrite(outbuf, 1, out_size, f);
  
      }
  
  
  
      /* add sequence end code to have a real mpeg file */
  
      outbuf[0] = 0x00;
  
      outbuf[1] = 0x00;
  
      outbuf[2] = 0x01;
  
      outbuf[3] = 0xb7;
  
      fwrite(outbuf, 1, 4, f);
  
      fclose(f);
  
      free(picture_buf);
  
      free(outbuf);
  
  
  
      avcodec_close(c);
  
      av_free(c);
  
      av_free(picture);
  
      printf("\n");
  
  }

• FFMPEG command execution error c#

  26 mars 2018, par Satvinder Singh

  I’m trying to create a watermarked audio file using C# but getting error every time I execute the command. The command runs successfully when I run it on command prompt and creates a watermarked audio file but gives error when I run it on my c# code.

  Command : ffmpeg -i A.mp3 -filter_complex "amovie=B.wav:loop=0,asetpts=N/SR/TB[beep] ;[0][beep]amix=duration=shortest,volume=1" out-watermarked.mp3

  Error : exited with exit code = 1 STDOUT

  Thanks in advance !!