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• Merge commit 'a2a9e4eea0e4fde2ed8d3405b4f33f655b600c2d'

  25 janvier 2018, par Mark Thompson

  Merge commit 'a2a9e4eea0e4fde2ed8d3405b4f33f655b600c2d'
  * commit 'a2a9e4eea0e4fde2ed8d3405b4f33f655b600c2d' :
  
    rtmp : Plug leak if sending bytes read report fails.
  This commit is a noop, see ee88f31d34c848fd95daf12bdf054b7228efdf14
  Merged-by : Mark Thompson <sw@jkqxz.net>
  

• C++ RTSP Stream recording timebase wrong ffmpeg

  29 juillet 2021, par Tom Baires

  We fetch a camera stream over RTSP (Axis Q1755 H264). And after a random time we a start recording the stream to a file. I check the video file with ffprobe and realise the start time is not the start time of the recording it is the start time of fetch the stream. My Video has a length of 5 seconds and the start time of the video should be 0. But the real starttime of the Video is at second 20. This leads to a an incorrect timebase. (ffmpeg Version 3.3.3)

  


  I try to repair it, but now i have some time the error timebase 1/180000... i marked my changes with the comment (timebase repair logic)

  


  

  


  ffprobe Output (without timebase repair logic)
The start is higher as the duration, correctly the start is 0 and not 20.080000

  


  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from
'C:\testvideo.mp4':  
 Metadata:
     major_brand     : isom
     minor_version   : 512
     compatible_brands: isomiso2avc1mp41
     encoder         : Lavf57.71.100   Duration: 00:00:05.04, start: 20.080000, bitrate: 2675 kb/s
     Stream #0:0(und): Video: h264 (Baseline) (avc1 / 0x31637661), yuvj420p(pc, bt709), 800x450 [SAR 1:1 DAR 16:9], 2670 kb/s, 50.20 fps,
 50 tbr, 180k tbn, 360k tbc (default)
     Metadata:
       handler_name    : VideoHandler


  


  Error after the add of timebase repair logic

  


  


  [mpeg4 @ 00000178fcb12b40] timebase 1/180000 not supported by MPEG 4
standard, the maximum admitted value for the timebase denominator is
65535 Could not open codec 'mpeg4' : Unspecified error Cannot start
recording

  


  


  Here some parts of my code

  


  Start Logic

  


  bool RecordingStreamGrabber::start()
{
    CORE_LOG_INFO(m_logger, "Started RecordingStreamGrabber");
    if (m_thread == NULL)
    {
        if (this->prepareInputStream())
        {
            m_run = true;
            m_thread = new std::thread(RecordingStreamGrabber::run, this);
            return true;
        }
        CORE_LOG_ERROR(m_logger, "Error starting RecrodingStreamGrabber");
        return false;
    }
    return false;
}


  


  Prepare Input/Output Stream

  


  bool RecordingStreamGrabber::prepareInputStream()
{
    CORE_LOG_INFO(m_logger, "Preparing Inputstream for recording: " << m_url);

    m_ifmtctx = avformat_alloc_context();
    interrupt_recording_nostop = false;
    interrupt_recording_timeout = m_timeout; // Timeout in milisekunde
    interrupt_recording_starttime = GetTickCount();
    m_ifmtctx->interrupt_callback = interrupt_timeout_cb;

    if (avformat_open_input(&m_ifmtctx, m_url.c_str(), NULL, NULL) != 0)
    {
        m_ifmtctx = NULL;
        CORE_LOG_ERROR(m_logger, "Error opening recording URL: " << m_url);
        return false;
    }

    interrupt_recording_nostop = true;

    if (avformat_find_stream_info(m_ifmtctx, NULL) < 0)
    {
        CORE_LOG_ERROR(m_logger, "Error finding stream in URL: " << m_url);
        avformat_close_input(&m_ifmtctx);
        m_ifmtctx = NULL;
        return false;
    }

    //search for the first video stream
    m_stream_index = -1;
    for (unsigned int i = 0; i < m_ifmtctx->nb_streams && m_stream_index == -1; i++)
    {
        m_iccx = m_ifmtctx->streams[i]->codec;
        if (m_iccx->codec_type == AVMEDIA_TYPE_VIDEO)
        {
            m_istream = m_ifmtctx->streams[i];
            m_stream_index = i;
        }
    }

    if (m_stream_index == -1)
    {
        CORE_LOG_ERROR(m_logger, "Could not find video stream in URL: " << m_url);
        avformat_close_input(&m_ifmtctx);
        m_ifmtctx = NULL;
        return false;
    }

    return true;
}

bool RecordingStreamGrabber::prepareOutputStream()
{
    if (m_ofmtctx)
    {
        CORE_LOG_DEBUG(m_logger, "Close outputfile: " << m_targetfile);
        avformat_free_context(m_ofmtctx);
        m_ofmtctx = NULL;
    }

    m_ofmt = av_guess_format(NULL, m_targetfile.c_str(), NULL);

    m_ofmtctx = avformat_alloc_context();

    m_ofmtctx->oformat = m_ofmt;

    if (avio_open2(&m_ofmtctx->pb, m_targetfile.c_str(), AVIO_FLAG_WRITE, NULL, NULL) != 0)
    {
        avformat_free_context(m_ofmtctx);
        m_ofmtctx = NULL;
        CORE_LOG_ERROR(m_logger, "Error opening outputfile: " << m_targetfile);
        return false;
    }

    m_ostream = avformat_new_stream(m_ofmtctx, NULL);

    avcodec_copy_context(m_ostream->codec, m_iccx);

    m_ostream->sample_aspect_ratio.num = m_iccx->sample_aspect_ratio.num;
    m_ostream->sample_aspect_ratio.den = m_iccx->sample_aspect_ratio.den;

    /* time base: this is the fundamental unit of time (in seconds) in terms
    of which frame timestamps are represented. for fixed-fps content,
    timebase should be 1/framerate and timestamp increments should be
    identically 1. */
    m_ostream->time_base.num = m_iccx->time_base.num;
    m_ostream->time_base.den = m_iccx->time_base.den;

    avformat_write_header(m_ofmtctx, NULL);

#ifdef WIN32
    sprintf_s(m_ofmtctx->filename, sizeof(m_ofmtctx->filename), "%s", m_targetfile.c_str());
#else
    snprintf(m_ofmtctx->filename, sizeof(m_ofmtctx->filename), "%s", m_targetfile.c_str());
#endif
    return true;
}


  


  Recording Logic

  


  void RecordingStreamGrabber::run(RecordingStreamGrabber *_this)
{
    AVPacket packet;
    av_init_packet(&packet);
    int i = 0;
    bool startFrame = true;
    bool keyFrame = false;
    int64_t pts, dts;
    _this->m_tailWritten = true;
    while (_this->m_run)
    {
        if (av_read_frame(_this->m_ifmtctx, &packet) >= 0)
        {
            if ((packet.flags & AV_PKT_FLAG_KEY) == AV_PKT_FLAG_KEY)
            {
                keyFrame = true;
                CORE_LOG_DEBUG(_this->m_logger, "Detected key frame: " << i << "");
            }

            if (_this->m_record)
            {
                if (packet.stream_index == _this->m_stream_index)
                {
                    packet.stream_index = _this->m_ostream->id;

                    if (_this->m_tailWritten == false || keyFrame == true)
                    {
                        //#####################################
                        //timebase repair logic (my changes)
                        //#####################################
                        AVStream *in_stream;
                        AVStream *out_stream;

                        in_stream = _this->m_ifmtctx->streams[packet.stream_index];
                        out_stream = _this->m_ofmtctx->streams[packet.stream_index];

                        if (startFrame)
                        {
                            pts = packet.pts;
                            dts = packet.dts;
                            startFrame = false;
                        }
                        packet.pts -= pts;
                        packet.dts -= dts;

                        packet.pts = av_rescale_q_rnd(packet.pts, in_stream->time_base, out_stream->time_base, (AVRounding)((int)AV_ROUND_NEAR_INF | (int)AV_ROUND_PASS_MINMAX));
                        packet.dts = av_rescale_q_rnd(packet.dts, in_stream->time_base, out_stream->time_base, (AVRounding)((int)AV_ROUND_NEAR_INF | (int)AV_ROUND_PASS_MINMAX));

                        packet.duration = av_rescale_q(packet.duration, in_stream->time_base, out_stream->time_base);
                        //end of my changes
                        
                        av_interleaved_write_frame(_this->m_ofmtctx, &packet);
                        _this->m_tailWritten = false;
                    }
                }
            }
            else if (_this->m_ofmtctx)
            {
                if (_this->m_tailWritten == false)
                {
                    av_write_trailer(_this->m_ofmtctx);
                    avio_close(_this->m_ofmtctx->pb);
                }
                avformat_free_context(_this->m_ofmtctx);
                _this->m_tailWritten = true;
                _this->m_ofmtctx = NULL;
                startFrame = true;
            }
            i++;
            keyFrame = false;
        }
        av_free_packet(&packet);
        av_init_packet(&packet);
    }
    if (_this->m_record)
    {
        av_write_trailer(_this->m_ofmtctx);
        avio_close(_this->m_ofmtctx->pb);
    }
    if (_this->m_ofmtctx)
    {
        avformat_free_context(_this->m_ofmtctx);
        _this->m_ofmtctx = NULL;
    }
    _this->m_record = false;

    avformat_close_input(&_this->m_ifmtctx);
    _this->m_ifmtctx = NULL;
}


  


  Other question
How can I check whether my project uses the deprecated api (answer of @berak) ?

  


• Anomalie #3616 (Nouveau) : procure dans le core

  8 décembre 2015, par Franck Dalot

  Bonjour
  Spip 3.1 [22635]

  Il y a 2 procures dans ce fichier qui ne semble pas être correcte
  https://core.spip.net/projects/spip/repository/entry/spip/ecrire/paquet.xml#L136
  
  
  Il s’agit de plugin qui sont natif à spip depuis spip 3.0, mais je ne suis pas sûr concernant les versions

  "Queue" est en 0.6.8 en plugin
  http://zone.spip.org/trac/spip-zone/browser/_plugins_/job_queue

  "Itérateur" est en version 1.0.6 en plugin
  http://zone.spip.org/trac/spip-zone/browser/_plugins_/iterateurs

  Les plugins sur la zone ne sont pas compatible 3.0 n’y 3.1 (logique) par contre, logiquement, si dans le core, il y bien eu report des commits qui ont été fait dans les plug, alors les numéros de version devrait être identique ?
  Faudrait vérifier s’il y a bien eu tous les reports et sans doute mettre les numéros de version à jour dans le core
  Franck