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• Error Opening Codec with avcodec

  2 février 2016, par marsop

  I have been trying to transcode subtitles from format SubRip (.srt) to MPEG4 Timed Text to mux them into a MP4 container, where there is already audio and video. Doing so from command line with ffmpeg is trivial :

  ffmpeg -i subtitles.srt -i video.mp4 -c:v copy -c:a copy -c:s mov_text videoWithSubtitles.mp4

  However, using avcodec, I am able to open both files and read from them, but when I try to open the AVCodecContext for the (encoder) codec AV_CODEC_ID_MOV_TEXT, I receive the following message :

  Error code: -1094995529
  
  Error occurred: Invalid data found when processing input

  The code that produces the error is the following :

  AVCodec *codec = avcodec_find_encoder(AV_CODEC_ID_MOV_TEXT);
  
  if (!codec) {
  
      NSLog(@"Error finding encoder");
  
      exit(-1);
  
  }
  
  
  
  AVCodecContext *codecContext = avcodec_alloc_context3(codec);
  
  if (!codecContext) {
  
      NSLog(@"Error allocating context");
  
      exit(-1);
  
  }
  
  
  
  if (avcodec_is_open(codecContext) == 0) {
  
      NSLog(@"output codec context is closed, opening");
  
      ret = avcodec_open2(codecContext, codec, NULL);
  
      if (ret < 0) {
  
          NSLog(@"Error code: %i",ret);
  
          NSLog(@"Error occurred: %s", av_err2str(ret));
  
          NSLog(@"Error opening encoder");
  
          exit(-1);
  
      }
  
  }

  The code works for all decoders (the same codec working in decode mode) and also with other encoders, mostly video or audio, but it also does not work for AV_CODEC_ID_SUBRIP or AV_CODEC_ID_SRT (set encoder).

• Cannot use FFmpeg in Xcode iOS Project (file .h not found)

  19 mars 2016, par BlackBox

  I followed almost step by step this guide.

  Almost because I downloaded, as a user suggested, ffmpeg ios library already built from here

  I followed from "Linking static libraries in Xcode" but I cannot import anyway the header files of ffmpeg. (So I got the .a files)

  For example

  #include "avformat.h"
  
  // or
  
  #import "libavformat/avformat.h"
  
  // or
  
  #import <libavformat></libavformat>avformat.h>

  Everything that I use does not work.

  I specify that those .a files are currently in my project directory, indeed, if I import the .a file, it doesn’t complain that it isn’t found, but when compiling, it complains about UTF-8 stuff because .a files are object libraries and cannot be imported that way.

  I put also the Header Search Paths for the project as it was suggested and the config.log file but nothing.

  Also I see libraries are missing from every project example of FFmpeg I was able to find on GitHub.

  Any ideas ?

• Add info on purpose of this project.

  24 octobre 2018, par blueimp

  Add info on purpose of this project.
  Add note to test security of configurations.