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• FFMPEG RTSP stream to MPEG4/H264 file using libx264

  16 octobre 2020, par Phi

  Heyo folks,

  



  I'm attempting to transcode/remux an RTSP stream in H264 format into a MPEG4 container, containing just the H264 video stream. Basically, webcam output into a MP4 container.

  



  I can get a poorly coded MP4 produced, using this code :

  



  // Variables here for demo
AVFormatContext * video_file_output_format = nullptr;
AVFormatContext * rtsp_format_context = nullptr;
AVCodecContext * video_file_codec_context = nullptr;
AVCodecContext * rtsp_vidstream_codec_context = nullptr;
AVPacket packet = {0};
AVStream * video_file_stream = nullptr;
AVCodec * rtsp_decoder_codec = nullptr;
int errorNum = 0, video_stream_index = 0;
std::string outputMP4file = "D:\\somemp4file.mp4";

// begin
AVDictionary * opts = nullptr;
av_dict_set(&opts, "rtsp_transport", "tcp", 0);

if ((errorNum = avformat_open_input(&rtsp_format_context, uriANSI.c_str(), NULL, &opts)) < 0) {
    errOut << "Connection failed: avformat_open_input failed with error " << errorNum << ":\r\n" << ErrorRead(errorNum);
    TacticalAbort();
    return;
}

rtsp_format_context->max_analyze_duration = 50000;
if ((errorNum = avformat_find_stream_info(rtsp_format_context, NULL)) < 0) {
    errOut << "Connection failed: avformat_find_stream_info failed with error " << errorNum << ":\r\n" << ErrorRead(errorNum);
    TacticalAbort();
    return;
}

video_stream_index = errorNum = av_find_best_stream(rtsp_format_context, AVMEDIA_TYPE_VIDEO, -1, -1, NULL, 0);

if (video_stream_index < 0) {
    errOut << "Connection in unexpected state; made a connection, but there was no video stream.\r\n"
        "Attempts to find a video stream resulted in error " << errorNum << ": " << ErrorRead(errorNum);
    TacticalAbort();
    return;
}

rtsp_vidstream_codec_context = rtsp_format_context->streams[video_stream_index]->codec;

av_init_packet(&packet);

if (!(video_file_output_format = av_guess_format(NULL, outputMP4file.c_str(),  NULL))) {
    TacticalAbort();
    throw std::exception("av_guess_format");
}

if (!(rtsp_decoder_codec = avcodec_find_decoder(rtsp_vidstream_codec_context->codec_id))) {
    errOut << "Connection failed: connected, but avcodec_find_decoder returned null.\r\n"
        "Couldn't find codec with an AV_CODEC_ID value of " << rtsp_vidstream_codec_context->codec_id << ".";
    TacticalAbort();
    return;
}

video_file_format_context = avformat_alloc_context();
video_file_format_context->oformat = video_file_output_format;

if (strcpy_s(video_file_format_context->filename, sizeof(video_file_format_context->filename), outputMP4file.c_str())) {
    errOut << "Couldn't open video file: strcpy_s failed with error " << errno << ".";
    std::string log = errOut.str();
    TacticalAbort();
    throw std::exception("strcpy_s");
}

if (!(video_file_encoder_codec = avcodec_find_encoder(video_file_output_format->video_codec))) {
    TacticalAbort();
    throw std::exception("avcodec_find_encoder");
}

// MARKER ONE

if (!outputMP4file.empty() &&
    !(video_file_output_format->flags & AVFMT_NOFILE) &&
    (errorNum = avio_open2(&video_file_format_context->pb, outputMP4file.c_str(), AVIO_FLAG_WRITE, nullptr, &opts)) < 0) {
    errOut << "Couldn't open video file \"" << outputMP4file << "\" for writing : avio_open2 failed with error " << errorNum << ": " << ErrorRead(errorNum);
    TacticalAbort();
    return;
}

// Create stream in MP4 file
if (!(video_file_stream = avformat_new_stream(video_file_format_context, video_file_encoder_codec))) {
    TacticalAbort();
    return;
}

AVCodecContext * video_file_codec_context = video_file_stream->codec;

// MARKER TWO

// error -22/-21 in avio_open2 if this is skipped
if ((errorNum = avcodec_copy_context(video_file_codec_context, rtsp_vidstream_codec_context)) != 0) {
    TacticalAbort();
    throw std::exception("avcodec_copy_context");
}

//video_file_codec_context->codec_tag = 0;

/*
// MARKER 3 - is this not needed? Examples suggest not.
if ((errorNum = avcodec_open2(video_file_codec_context, video_file_encoder_codec, &opts)) < 0)
{
    errOut << "Couldn't open video file codec context: avcodec_open2 failed with error " << errorNum << ": " << ErrorRead(errorNum);
    std::string log = errOut.str();
    TacticalAbort();
    throw std::exception("avcodec_open2, video file");
}*/

//video_file_format_context->flags |= AVFMT_FLAG_GENPTS;
if (video_file_format_context->oformat->flags & AVFMT_GLOBALHEADER)
{
    video_file_codec_context->flags |= CODEC_FLAG_GLOBAL_HEADER;
}

if ((errorNum = avformat_write_header(video_file_format_context, &opts)) < 0) {
    errOut << "Couldn't open video file: avformat_write_header failed with error " << errorNum << ":\r\n" << ErrorRead(errorNum);
    std::string log = errOut.str();
    TacticalAbort();
    return;
}


  



  However, there are several issues :

  



  

  1. I can't pass any x264 options to the output file. The output H264 matches the input H264's profile/level - switching cameras to a different model switches H264 level.

  


  2. The timing of the output file is off, noticeably.

  


  3. The duration of the output file is off, massively. A few seconds of footage becomes hours, although playtime doesn't match. (FWIW, I'm using VLC to play them.)

  


  



  Passing x264 options

  



  If I manually increment PTS per packet, and set DTS equal to PTS, it plays too fast, 2-3 seconds' worth of footage in one second playtime, and duration is hours long. The footage also blurs past several seconds, about 10 seconds' footage in a second.

  



  If I let FFMPEG decide (with or without GENPTS flag), the file has a variable frame rate (probably as expected), but it plays the whole file in an instant and has a long duration too (over forty hours for a few seconds). The duration isn't "real", as the file plays in an instant.

  



  At Marker One, I try to set the profile by passing options to avio_open2. The options are simply ignored by libx264. I've tried :

  



  av_dict_set(&opts, "vprofile", "main", 0);
av_dict_set(&opts, "profile", "main", 0); // error, missing '('
// FF_PROFILE_H264_MAIN equals 77, so I also tried
av_dict_set(&opts, "vprofile", "77", 0); 
av_dict_set(&opts, "profile", "77", 0);


  



  It does seem to read the profile setting, but it doesn't use them. At Marker Two, I tried to set it after the avio_open2, before avformat_write_header .

  



  // I tried all 4 av_dict_set from earlier, passing it to avformat_write_header.
// None had any effect, they weren't consumed.
av_opt_set(video_file_codec_context, "profile", "77", 0);
av_opt_set(video_file_codec_context, "profile", "main", 0);
video_file_codec_context->profile = FF_PROFILE_H264_MAIN;
av_opt_set(video_file_codec_context->priv_data, "profile", "77", 0);
av_opt_set(video_file_codec_context->priv_data, "profile", "main", 0);


  



  Messing with privdata made the program unstable, but I was trying anything at that point.
I'd like to solve issue 1 with passing settings, since I imagine it'd bottleneck any attempt to solve issues 2 or 3.

  



  I've been fiddling with this for the better part of a month now. I've been through dozens of documentation, Q&As, examples. It doesn't help that quite a few are outdated.

  



  Any help would be appreciated.

  



  Cheers

  


• create an Json file as an output from a ffmpeg command line

  22 juin 2020, par ringola27

  I am trying to put the output I get from a ffmpeg command into a json file.
So I tried :

  


  ffmpeg -i 2.y4m -i netflixboxing.y4m -lavfi "libvmaf=model_path=/usr/local/share/model/vmaf_v0.6.1.pkl" -f null - > out.json 


  


  I get an empty json file. Do i have to specify which information I need in my json file ?

  


  I hope someone can help me.

  


• Calculate VMAF for HEVC or H264 with ffmpeg

  3 juin 2020, par ringola27

  I am able to calculate VMAF for the videos encoded with VP9 but not for the videos encoded with HEVC and H264.

  



  I am getting the output :

  



  VMAF score: nan

  



  For the Command Line : 
ffmpeg -i netflix200kHEVC.mp4 -i netflixboxing.y4m -lavfi "libvmaf=model_path=/usr/local/share/model/vmaf_v0.6.1.pkl" -f null -

  



  Do you know this kind of problem ? How can I solve it ?

  



      ffmpeg -i netflix200kHEVC.mp4 -i netflixboxing.y4m -lavfi "libvmaf=model_path=/usr/local/share/model/vmaf_v0.6.1.pkl" -f null -
ffmpeg version 4.2.2 Copyright (c) 2000-2019 the FFmpeg developers
  built with Apple clang version 11.0.3 (clang-1103.0.32.62)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.2.2-with-options_2 --enable-shared --cc=clang --host-cflags=-fno-stack-check --host-ldflags= --enable-gpl --enable-libaom --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-libsnappy --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --disable-libjack --disable-indev=jack --enable-opencl --enable-videotoolbox --disable-htmlpages --enable-libvmaf --enable-version3
  libavutil      56. 31.100 / 56. 31.100
  libavcodec     58. 54.100 / 58. 54.100
  libavformat    58. 29.100 / 58. 29.100
  libavdevice    58.  8.100 / 58.  8.100
  libavfilter     7. 57.100 /  7. 57.100
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'netflix200kHEVC.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2mp41
    encoder         : Lavf58.29.100
  Duration: 00:00:04.23, start: 0.000000, bitrate: 2070 kb/s
    Stream #0:0(und): Video: hevc (Main 10) (hev1 / 0x31766568), yuv420p10le(tv, progressive), 4096x2160 [SAR 1:1 DAR 256:135], 2058 kb/s, 60 fps, 60 tbr, 15360 tbn, 60 tbc (default)
    Metadata:
      handler_name    : VideoHandler
Input #1, yuv4mpegpipe, from 'netflixboxing.y4m':
  Duration: 00:00:04.23, start: 0.000000, bitrate: 12740202 kb/s
    Stream #1:0: Video: rawvideo (Y3[11][10] / 0xA0B3359), yuv420p10le(progressive), 4096x2160, SAR 1:1 DAR 256:135, 60 fps, 60 tbr, 60 tbn, 60 tbc
Stream mapping:
  Stream #0:0 (hevc) -> libvmaf:main
  Stream #1:0 (rawvideo) -> libvmaf:reference
  libvmaf -> Stream #0:0 (wrapped_avframe)
Press [q] to stop, [?] for help
frame=    0 fps=0.0 q=0.0 size=N/A time=-577014:32:22.77 bitrate=N/A speed=N/A  Output #0, null, to 'pipe:':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2mp41
    encoder         : Lavf58.29.100
    Stream #0:0: Video: wrapped_avframe, yuv420p10le, 4096x2160 [SAR 1:1 DAR 256:135], q=2-31, 200 kb/s, 60 fps, 60 tbn, 60 tbc (default)
    Metadata:
      encoder         : Lavc58.54.100 wrapped_avframe
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time=00:00:00.30 bitrate=N/A speed=0.0189x  frame=   19 fps=1.1 q=-0.0 size=N/A time=00:00:00.31 bitrate=N/A speed=0.0181x  frame=   20 fps=1.1 q=-0.0 size=N/A time=00:00:00.33 bitrate=N/A speed=0.0183x  frame=   22 fps=1.2 q=-0.0 size=N/A time=00:00:00.36 bitrate=N/A speed=0.0195x  frame=   23 fps=1.1 q=-0.0 size=N/A time=00:00:00.38 bitrate=N/A speed=0.0188x  frame=   24 fps=1.1 q=-0.0 size=N/A time=00:00:00.40 bitrate=N/A speed=0.019x   frame=   26 fps=1.2 q=-0.0 size=N/A time=00:00:00.43 bitrate=N/A speed=0.0199x  frame=   27 fps=1.2 q=-0.0 size=N/A time=00:00:00.45 bitrate=N/A speed=0.0194x  frame=   28 fps=1.2 q=-0.0 size=N/A time=00:00:00.46 bitrate=N/A speed=0.0194x  frame=   30 fps=1.2 q=-0.0 size=N/A time=00:00:00.50 bitrate=N/A speed=0.0203x  frame=   31 fps=1.2 q=-0.0 size=N/A time=00:00:00.51 bitrate=N/A speed=0.0199x  frame=   32 fps=1.2 q=-0.0 size=N/A time=00:00:00.53 bitrate=N/A speed=0.0199x  frame=   33 fps=1.2 q=-0.0 size=N/A time=00:00:00.55 bitrate=N/A speed=0.0202x  frame=   35 fps=1.2 q=-0.0 size=N/A time=00:00:00.58 bitrate=N/A speed=0.0201x  frame=   37 fps=1.2 q=-0.0 size=N/A time=00:00:00.61 bitrate=N/A speed=0.0202x  frame=   39 fps=1.2 q=-0.0 size=N/A time=00:00:00.65 bitrate=N/A speed=0.0203x  frame=   40 fps=1.2 q=-0.0 size=N/A time=00:00:00.66 bitrate=N/A speed=0.0203x  frame=   41 fps=1.2 q=-0.0 size=N/A time=00:00:00.68 bitrate=N/A speed=0.0205x  frame=   43 fps=1.2 q=-0.0 size=N/A time=00:00:00.71 bitrate=N/A speed=0.0206x  frame=   44 fps=1.2 q=-0.0 size=N/A time=00:00:00.73 bitrate=N/A speed=0.0205x  frame=   46 fps=1.3 q=-0.0 size=N/A time=00:00:00.76 bitrate=N/A speed=0.0211x  frame=   47 fps=1.3 q=-0.0 size=N/A time=00:00:00.78 bitrate=N/A speed=0.0209x  frame=   48 fps=1.2 q=-0.0 size=N/A time=00:00:00.80 bitrate=N/A speed=0.0208x  frame=   50 fps=1.3 q=-0.0 size=N/A time=00:00:00.83 bitrate=N/A speed=0.0212x  frame=   51 fps=1.3 q=-0.0 size=N/A time=00:00:00.85 bitrate=N/A speed=0.021x   frame=   52 fps=1.3 q=-0.0 size=N/A time=00:00:00.86 bitrate=N/A speed=0.0209x  frame=   54 fps=1.3 q=-0.0 size=N/A time=00:00:00.90 bitrate=N/A speed=0.0213x  frame=   55 fps=1.3 q=-0.0 size=N/A time=00:00:00.91 bitrate=N/A speed=0.0212x  frame=   56 fps=1.3 q=-0.0 size=N/A time=00:00:00.93 bitrate=N/A speed=0.021x   frame=   57 fps=1.3 q=-0.0 size=N/A time=00:00:00.95 bitrate=N/A speed=0.0211x  frame=   59 fps=1.3 q=-0.0 size=N/A time=00:00:00.98 bitrate=N/A speed=0.0212x  frame=   60 fps=1.3 q=-0.0 size=N/A time=00:00:01.00 bitrate=N/A speed=0.0211x  frame=   61 fps=1.3 q=-0.0 size=N/A time=00:00:01.01 bitrate=N/A speed=0.0212x  frame=   63 fps=1.3 q=-0.0 size=N/A time=00:00:01.05 bitrate=N/A speed=0.0212x  frame=   64 fps=1.3 q=-0.0 size=N/A time=00:00:01.06 bitrate=N/A speed=0.0211x  frame=   65 fps=1.3 q=-0.0 size=N/A time=00:00:01.08 bitrate=N/A speed=0.0212x  frame=   67 fps=1.3 q=-0.0 size=N/A time=00:00:01.11 bitrate=N/A speed=0.0213x  frame=   68 fps=1.3 q=-0.0 size=N/A time=00:00:01.13 bitrate=N/A speed=0.0212x  frame=   69 fps=1.3 q=-0.0 size=N/A time=00:00:01.15 bitrate=N/A speed=0.0212x  frame=   71 fps=1.3 q=-0.0 size=N/A time=00:00:01.18 bitrate=N/A speed=0.0213x  frame=   72 fps=1.3 q=-0.0 size=N/A time=00:00:01.20 bitrate=N/A speed=0.0212x  frame=   73 fps=1.3 q=-0.0 size=N/A time=00:00:01.21 bitrate=N/A speed=0.0213x  frame=   75 fps=1.3 q=-0.0 size=N/A time=00:00:01.25 bitrate=N/A speed=0.0214x  frame=   76 fps=1.3 q=-0.0 size=N/A time=00:00:01.26 bitrate=N/A speed=0.0213x  frame=   77 fps=1.3 q=-0.0 size=N/A time=00:00:01.28 bitrate=N/A speed=0.0213x  frame=   79 fps=1.3 q=-0.0 size=N/A time=00:00:01.31 bitrate=N/A speed=0.0215x  frame=   80 fps=1.3 q=-0.0 size=N/A time=00:00:01.33 bitrate=N/A speed=0.0214x  frame=   81 fps=1.3 q=-0.0 size=N/A time=00:00:01.35 bitrate=N/A speed=0.0214x  frame=   83 fps=1.3 q=-0.0 size=N/A time=00:00:01.38 bitrate=N/A speed=0.0216x  frame=   84 fps=1.3 q=-0.0 size=N/A time=00:00:01.40 bitrate=N/A speed=0.0214x  frame=   85 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video:133kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
[libvmaf @ 0x7ff05a61b300] VMAF score: nan