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• Can't play m3u8 file in VLC or decrypt it with ffmpeg

  22 septembre 2021, par Novice At Everything

  I have found and downloaded the m3u8 file using the developer tools in Edge. However, it won't play directly in VLC.

  


  I then downloaded all the segments referred to in the m3u8 file as well as the key and put them in the same folder as ffmpeg. The partial contents of the m3u8 file are :

  


  #EXTM3U
#EXT-X-VERSION:3
#EXT-X-TARGETDURATION:13
#EXT-X-MEDIA-SEQUENCE:1
#EXT-X-PLAYLIST-TYPE:VOD
#EXT-X-KEY:METHOD=AES-128,URI="keyfile.txt",IV=0x00000000000000000000000000000001
#EXTINF:12,
seg-1-z.ts
#EXT-X-KEY:METHOD=AES-128,URI="keyfile.txt",IV=0x00000000000000000000000000000002
#EXTINF:12,
seg-2-z.ts
...
#EXT-X-KEY:METHOD=AES-128,URI="keyfile.txt",IV=0x0000000000000000000000000000013E
#EXTINF:8,
seg-318-z.ts
#EXT-X-ENDLIST


  


  The keyfile.txt contents are : eyJwYXNzcGhyYXNlIjoiNjE0YjQ5NTYzYTdlYiIsImNpcGhlcnRleHQiOiJlamZOTWRSZjltY3Z4R1JRTFg2cVMralJJTmZaUGJyMXVyaFhhTVZ1QVptSUpXZVdYMkZLQ0t1Q0ZCYUQwY3FYIiwiaXYiOiIxZTNlNzg3ZjNjYmRlOGViZDdlZTBkNWVhZDA1NmEzNCIsInNhbHQiOiIwNjc3M2I1OWE1Y2IxZjA3ODdkYmEzZTAwYWZmNGIzNyJ9

  


  This is what I get when I run ffmpeg :

  


  C:\Test\download>ffmpeg -allowed_extensions ALL -i "play.m3u8" -c copy "test.ts"
ffmpeg version 2021-09-16-git-8f92a1862a-essentials_build-www.gyan.dev Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 10.3.0 (Rev5, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-sdl2 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libgme --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libtheora --enable-libvo-amrwbenc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-librubberband
  libavutil      57.  5.100 / 57.  5.100
  libavcodec     59.  7.103 / 59.  7.103
  libavformat    59.  5.100 / 59.  5.100
  libavdevice    59.  0.101 / 59.  0.101
  libavfilter     8.  9.100 /  8.  9.100
  libswscale      6.  1.100 /  6.  1.100
  libswresample   4.  0.100 /  4.  0.100
  libpostproc    56.  0.100 / 56.  0.100
[hls @ 000001c67608d140] Skip ('#EXT-X-VERSION:3')
[hls @ 000001c67608d140] Opening 'keyfile.txt' for reading
[hls @ 000001c67608d140] Opening 'crypto:seg-1-z.ts' for reading
[hls @ 000001c67608d140] Error when loading first segment 'seg-1-z.ts'
play.m3u8: Invalid data found when processing input


  


  Can anyone help ? Thanks

  


• select a screen section ffmpeg c++ on macos

  21 avril 2022, par C1ngh10

  I am trying to record the screen on macos, with ffmpeg. I would like to be able to select a section of the screen instead of the whole desktop. I tried to set several options such as vf, with values like "crop=150:150:0:0", or video_size with value "150x150". The result was that the output video had the correct dimensions (150x150) but whole screen has been recorded instead of the specified section. Does anybody know another way to do that ?

  


  int ScreenRecorder::openVideoDevice() {
    value = 0;
    videoOptions = nullptr;
    pAVFormatContext = nullptr;

    pAVFormatContext = avformat_alloc_context();


    string dimension = to_string(width) + "x" + to_string(height);
    av_dict_set(&videoOptions, "video_size", dimension.c_str(), 0);   //option to set the dimension of the screen section to record
    value = av_dict_set(&videoOptions, "framerate", "25", 0);
    if (value < 0) {
        cerr << "Error in setting dictionary value (setting framerate)" << endl;
        exit(-1);
    }

    value = av_dict_set(&videoOptions, "preset", "ultrafast", 0);
    if (value < 0) {
        cerr << "Error in setting dictionary value (setting preset value)" << endl;
        exit(-1);
    }

    //The distance from the left edge of the screen or desktop
    value = av_dict_set(&videoOptions, "vf", ("crop=" + to_string(width) + ":" + to_string(height) + ":" + to_string(x_offset) + ":" +
        to_string(y_offset)).c_str(), 0);

    if (value < 0) {
        cerr << "Error in setting crop" << endl;
        exit(-1);
    }

    value = av_dict_set(&videoOptions, "pixel_format", "yuv420p", 0);
    if (value < 0) {
        cerr << "Error in setting pixel format" << endl;
        exit(-1);
    }
    
    pAVInputFormat = av_find_input_format("avfoundation");

    if (avformat_open_input(&pAVFormatContext, "1:none", pAVInputFormat, &videoOptions) != 0) {
        cerr << "Error in opening input device" << endl;
        exit(-1);
    }
    //get video stream infos from context
    value = avformat_find_stream_info(pAVFormatContext, nullptr);
    if (value < 0) {
        cerr << "Error in retrieving the stream info" << endl;
        exit(-1);
    }

    VideoStreamIndx = -1;
    for (int i = 0; i < pAVFormatContext->nb_streams; i++) {
        if (pAVFormatContext->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
            VideoStreamIndx = i;
            break;
        }
    }
    if (VideoStreamIndx == -1) {
        cerr << "Error: unable to find video stream index" << endl;
        exit(-2);
    }

    pAVCodecContext = pAVFormatContext->streams[VideoStreamIndx]->codec;
    pAVCodec = avcodec_find_decoder(pAVCodecContext->codec_id/*params->codec_id*/);
    if (pAVCodec == nullptr) {
        cerr << "Error: unable to find decoder video" << endl;
        exit(-1);
    }

    return 0;
}


  


• avfilter/af_apsyclip : fix peak overestimation

  29 janvier 2022, par Jason Jang

  avfilter/af_apsyclip : fix peak overestimation
  Ignore more samples that are near the edge of the block. The reason
  
  is that the filtering tends to cause these samples to go above the
  
  window more than the samples near the middle. If these samples are
  
  included in the unwindowed peak estimation, the peak can be
  
  overestimated. Because the block is windowed again before
  
  overlapping, overshoots near the edge of the block are not very
  
  important.
  0.1 is the value from the version originally contributed to calf.
  Signed-off-by : Jason Jang <jcj83429@gmail.com>
  

  • [DH] libavfilter/af_apsyclip.c