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• 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)

  


• avcodec/speedhqenc : Don't initialize unused parts of RLTable

  22 octobre 2022, par Andreas Rheinhardt

  avcodec/speedhqenc : Don't initialize unused parts of RLTable
  ff_rl_init() initializes RLTable.(max_level|max_run|index_run) ;
  
  max_run is unused by the SpeedHQ encoder (as well as MPEG-1/2).
  
  Furthermore, it initializes these things twice (for two passes),
  
  but the second half of this is never used.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavcodec/speedhqenc.c