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• qt-faststart never finish

  19 avril 2012, par Shakti Singh

  I am trying to use qt-faststart on MP4 videos to make the streaming fast but the qt-faststart command is never get finish, It is running from the last one and half hour and video file is of 14MB only.

  The command is showing the ftyp and free as output

  the output look like this

  ftyp 2324322  32
  
  free 2324456   8

  and the number is keep increasing with the output. No error is shown.

  The MP4 video is converted from FLV video using the FFMPEG.

  Generally it show the output like this but with my installation of qt-faststart I never get this ouput

      patching stco atom...
  
      patching stco atom..
  
      writing ftyp atom...
  
      writing moov atom...
  
      copying rest of file ...

  What could be the issue ?
  Is there anything wrong with the installation of qt-faststart ?

  I am on Linux 2.6.18-128.2.1.el5PAE i686

• avcodec/jpegxl : add Jpeg XL image codec

  17 avril 2022, par Leo Izen

  avcodec/jpegxl : add Jpeg XL image codec
  This commit adds support to libavcodec to read
  
  encoded Jpeg XL images. Jpeg XL is intended to be an
  
  extended-life replacement to legacy mjpeg.
  

  • [DH] MAINTAINERS
  • [DH] libavcodec/codec_desc.c
  • [DH] libavcodec/codec_id.h

• ffmpeg avcodec_open2() return error -22 only in ubuntu

  26 octobre 2020, par User800222

  AS title,

  


  I'm working on a project on Mac with ffmpeg. It runs on my Mac to encode frames to vp9 & vp8. But when I run it on my docker image in a ubuntu, the function avcodec_open2(), returns -22 error. (only for vp9&vp8, h264 works).

  


  I wonder if the error comes from the setting parameters part ? But it's still weird to have it working on mac but not in ubuntu.

  


  Does anyone has a similar experience ?

  


  bool open_video(AVFormatContext * oc,AVCodec * codec,OutputStream * ost,AVDictionary * opt_arg, bool reduceQuality) {
    int ret;
    AVCodecContext * c = ost->st->codec;
    AVDictionary * opt = NULL;
    av_dict_copy(&opt,opt_arg,0);

    if(codec264){
      // http://arstechnica.com/civis/viewtopic.php?f=6&t=1239375
      av_dict_set(&opt,"refs",    "3",          0);
      av_dict_set(&opt,"vprofile","main",       0);  // 2 versions to support differents libav/ffmpeg
      av_dict_set(&opt,"profile", "main",       0);
      
      //av_dict_set(&opt,"preset","superfast",0);
      //av_dict_set(&opt,"preset","ultrafast",0);
      av_dict_set(&opt,"preset","superfast",0);
      //av_dict_set(&opt,"preset","slow",0);
      
      //https://mattgadient.com/2013/06/12/a-best-settings-guide-for-handbrake-0-9-9/
      //av_dict_set(&opt, "tune", "zerolatency", 0); //bluerry but very small size
      //av_dict_set(&opt, "tune", "fastdecode", 0); // hd but large size
      // 23 300k, 29 150k, 35 75k
      if(reduceQuality)
        av_dict_set(&opt, "crf", "35", 0); //35 +-6 decrease/increase bitrate half/twice
      else
        av_dict_set(&opt, "crf", "29", 0); //29 +-6 decrease/increase bitrate half/twice
    
    }
    else if (codecVP9)
    { 
        // Setting explanation:
        // http://wiki.webmproject.org/ffmpeg/vp9-encoding-guide
        // https://developers.google.com/media/vp9/live-encoding/
        // https://developers.google.com/media/vp9/settings/vod/
        // https://developers.google.com/media/vp9/bitrate-modes/

        if(reduceQuality) //crf is the quality value for VP9 (0-63), lower the better quality youll get 
          av_dict_set(&opt, "crf"    ,      "40",         0); 
        else
          av_dict_set(&opt, "crf"    ,      "45",         0);
        av_dict_set(&opt, "speed"  ,        "8" ,         0);
        av_dict_set(&opt, "quality",        "realtime",   0); //realtime is recommended
        //av_dict_set(&opt, "threads",        "4" ,         0);
        //av_dict_set(&opt, "tile-columns",   "2",          0);
        //av_dict_set(&opt, "frame-parallel", "1",          0);
        //av_dict_set(&opt, "row-mt",         "1",          0);
        av_dict_set(&opt, "b:v",            "1",         0);
        av_dict_set(&opt, "g",              "400",        0); //key frame interval (big difference in vid size)

        //av_dict_set(&opt, "maxrate",        "3k",         0);
        //av_dict_set(&opt, "minrate",        "1k",         0);
        //av_dict_set(&opt, "hwaccel",        "vaapi",      0);
        //av_dict_set(&opt, "c:v",            "libvpx-vp9", 0);
        
    }
    else if (codecVP8)
    {
        // https://trac.ffmpeg.org/wiki/Encode/VP8 
        av_dict_set(&opt, "passes"    ,        "1" ,         0);   
        av_dict_set(&opt, "cpu-used"  ,        "15" ,         0); 
        av_dict_set(&opt, "qmax"      ,        "63",         0);   
        av_dict_set(&opt, "rt"        ,          "",         0); // realtime setting
        //av_dict_set(&opt, "crf"       ,        "10",         0);   

        if(reduceQuality)
          av_dict_set(&opt, "qmin"     ,        "40",        0); // Lower quality, smaller sizes
        else
          av_dict_set(&opt, "qmin"     ,        "35",        0); // Higher quality, larger sizes
    }
    else 
    {
        if(reduceQuality)
            av_dict_set(&opt, "x265-params", "crf=29", 0);
        else
            av_dict_set(&opt, "x265-params", "crf=23", 0);
        
        av_dict_set(&opt, "preset", "ultrafast", 0);
        av_dict_set(&opt, "tune", "zerolatency", 0);
//        av_dict_set(&opt, "profile", "main", 0);
    }
      
    // Open the codec
    ret = avcodec_open2(c,codec,&opt);
    av_dict_free(&opt);
    if (ret < 0) {
        cout << "Could not open video codec. (error code:" << ret << ")\n";
        return false;
    } // if


  


  Edit : Does anyone know if the ffmpeg-linux using different parameters' name for setting from other platform's (like Mac) ?

  


  Eidt2 : It seems like even if I don't set any options parameters, it's still giving me -22 error. Ex : ret = avcodec_open2(c, codec, NULL)