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• How to create AVStream with AV_DISPOSITION_TIMED_THUMBNAILS flag

  11 mars 2020, par VGSPB

  I’m try to make audiobook using ffmpeg. m4b format support covers picture for each chapter. ffmpeg load it as well, but I’cant create AVStream with AV_DISPOSITION_TIMED_THUMBNAILS disposition flag.

  int addVideoStream( AVFormatContext *ctx, CoverData *cover) {
  
      const AVCodec *c = avcodec_find_encoder( AV_CODEC_ID_MJPEG );
  
      if ( !c )
  
          return -1;
  
  
  
      int stream_indx = ctx->nb_streams;
  
  
  
      AVStream *stream = avformat_new_stream( ctx, NULL );
  
      AVCodecContext *img_codec_ctx = avcodec_alloc_context3( c );
  
  
  
      img_codec_ctx->width = cover->width();
  
      img_codec_ctx->height = cover->height();
  
      img_codec_ctx->pix_fmt = AV_PIX_FMT_YUVJ420P;
  
  
  
      if ( ctx->oformat->flags & AVFMT_GLOBALHEADER )
  
          img_codec_ctx->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
  
  
  
      int res = avcodec_parameters_from_context( stream->codecpar, img_codec_ctx );
  
      avcodec_free_context( &img_codec_ctx );
  
  
  
  
  
      return stream_indx;
  
  }
  
  
  
  int new_v_stream_index = addVideoStream( out_ctx, img_data );
  
  AVStream *v_stream = out_ctx->streams[ new_v_stream_index ];
  
  v_stream->disposition = AV_DISPOSITION_DEFAULT|AV_DISPOSITION_ATTACHED_PIC|AV_DISPOSITION_TIMED_THUMBNAILS;
  
  int error = avformat_write_header( out_ctx, NULL );

  return error = -22

  if set disposition only

  v_stream->disposition = AV_DISPOSITION_ATTACHED_PIC;

  error = 0, but it is only for one attached picture packet : stream->attached_pic

  where am i wrong ?

• What's the easiest way to merge video, audio and image files ?

  5 novembre 2012, par Sync

  We are planning a Wep App for a Hackathon that's happening in about 2 weeks.
  The app basic functions are :

  • The users are guided step-by-step to upload a video, audio and image.
  • The image is used as a cover for the audio. Making it into a video file.
  • The two video files are merged thus creating a single video from the initial three files.

  So, my problem is :

  1. How do you create a video from an audio with an image as "cover".
  2. How do you merge this two videos.

  We are thinking of using Heroku for deployment. Is there a way to do it using something like stremio ?

  What would be the best approach ? A VPS running a C++ script ? How's the easiest way to do it ?

• Static image and a folder of mp3's ?

  28 juin 2013, par Shirohige

  I want to create a bunch of videos consisting of an single image which is shown throughout the whole video but each video has a different audio file. I can do it manually with various tools but the problem is that I have a lot of audio files and I can't optimize the frame rate (more on that later) and it takes a lot of time to do it that way but ffmpeg offers everything I need but the problem is that I don't know how to batch process everything.

  The basic code :
  ffmpeg -i song-name.mp3 -loop 1 -i cover.jpg -r frame-rate -t song-length -acodec copy output.mp4

  What I want to achieve :
  Let's say that I have a folder which consists of several audio files : song-name-1.mp3, song-name-2.mp3, ..., song-name-n.mp3 and cover.jpg.

  I need a batch file which takes the name of every mp3 file in a folder (a FOR loop I suppose) and processes it with the same command :
  ffmpeg -i song-name.mp3 -loop 1 -i cover.jpg -r frame-rate -t song-length -acodec copy output.mp4

  So the image is always the same for every video. The song length can be taken with the tool mp3info and the corresponding command :
  mp3info.exe -p %S song-name.mp3

  Since I only have one image throughout the whole video, the optimal frame rate would be the inverse of the video length which is 1/length (where length is a variable in seconds which we get from mp3info).

  So the final code should look something like this :
  ffmpeg -i song-name.mp3 -loop 1 -i cover.jpg -r 1/length -t length -acodec copy song-name.mp4

  Where "song-name" is a variable which changes for every iteration of the FOR loop (i.e. for every audio file in the folder) and length is a variable whose value we get with the command :
  mp3info.exe -p %S song-name.mp3

  I found examples of a FOR loop to fetch all file names of all mp3's in a specific folder but I do not know how to integrate mp3info. I hope that somebody can help me and I have some knowledge of the C programming language if that can be used in any way.