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• How to measure the performance of a newsletter (or any email) with Piwik

  19 décembre 2017, par InnoCraft — Community

  To be able to grow your business, it is crucial to track all your marketing efforts. This includes all newsletters and emails that you share with people outside of your business. Otherwise, you won’t be able to know which of your daily efforts are yielding results.

  Are you wondering if it is possible to track the performance of an emailing campaign in Piwik efficiently ? Would you like to know if it is technically easy ? No worries, here is a “How to” tutorial showing you how easily you can track an emailing in Piwik properly.

  Different tracking levels for different needs

  There are many things that you may be interested to track, for example :

  

  1. How many users opened your email
  2. How many users interacted with the links in your email
  3. How many users interacted on your website through your email

  Let’s have a look at each of these levels.

  Step 1 – Tracking email and newsletter openings in Piwik

  Tracking email openings requires to add an HTML code to your newsletter. It works through what we call a tracking pixel, a tiny image of 1×1 that is transparent so the user will not be able to see it.
  In order to install it, here is an example of what this code looks like :

  <img src="https://piwik.example.com/piwik.php?idsite=YOUR_PIWIK_WEBSITE_ID&rec=1&bots=1&url=https%3A%2F%2Fexample.com%2Femail-opened%2Fnewsletter_XYZ&action_name=Email%20opened&_rcn=internal%20email%20name&_rck=newsletter_XYZ" style="border:0;” alt="" />

  The Piwik tracking pixel explained

  The above URL is composed of the following URL parameters which are part of our Tracking API :

  • idsite : Corresponds to the ID of the website you would like to track.
  • rec : You need to have rec=1 in order for the request to be actually recorded.
  • bots : Set it to 1 to include all the connections made to this request, bots included.
  • url : corresponds to the URL you would like to display in Piwik every time the email is opened.
  • action_name : This is the page name you would like to be tracked when the email is opened.
  • _rcn : The name you would like to give to your campaign.
  • _rck : The keyword you may like to use in order to summarize the content of your newsletter.

  You may have noticed some special characters here such as “%20”, “%2F”. That’s because the URL is encoded. We strongly recommend you to do so in order for your tracking not to break. Many tools are available on the web in order to encode your URLs such as https://www.urlencoder.org/.

  If you would like to access the previous tracking code easily, keep in mind that you can always find the tracking code generator within the “Piwik admin panel → Tracking code” :

  

  You can find more information about it on our guide at : How do I track how many users open and read my newsletter emails (using a pixel / beacon) ?

  As a result, the information will be pushed as following for any user who opens your email :

  

  To not bias your regular page views on your website with newsletter openings, we recommend tracking newsletter openings into a new website.

  Tracking even more data : the user ID example

  You can go deeper in your URL tracking by inserting other parameters such as the user id if you have this information within your emailing database. One of the main benefit of tracking the User ID is to connect data across multiple devices and browsers for a given user.

  You only need to add the following parameter &uid=XXX where XXX equals the dynamic value of the user ID :

  

  Make sure that UID from your emailing provider is the same as the one used on your website in order for your data to be consistent.

  Important note : some email providers are loading email messages by default which results in an opening even if the user did not actually open the email.

  Step 2 – Measure the clicks within your emailing

  Tracking clicks within an email lets you know with which content readers interacted the most. We recommend tracking all links in all your emails as a campaign, whether it is a newsletter, a custom support email, an email invoice, etc. You might be surprised to see which of your emails lead to conversions and if they don’t, try to tweak those emails, so they might in the future.

  Tracking clicks This works thanks to URL campaign tracking. In order to perform this action, you will need to add Piwik URL parameters to all your existing link URLs :

  • Website URL : for example “www.your-website.com”.
  • Campaign name : for example “pk_campaign=emailing”. Represents the name you would like to give to your campaign.
  • Campaign keyword : for example “pk_keyword=name-of-your-article”. Represents the name you would like to give to your content.
  • Campaign source : for example “pk_source=newsletter”. Represents the name of the referrer.
  • Campaign medium : for example “pk_medium=email”. Represents the type of referrer you are using.
  • Campaign content : for example “pk_content=title”. Represents the type of content.

  You can find more information about campaign url tracking in our “Tracking marketing campaigns with Piwik” guide.

  Here is a sample showing you how you can differentiate some links in a newsletter, all pointing to the same URL :

  

  Once you have added these URL parameters to each of your link, Piwik will clearly indicate the referrer of this specific campaign when a user clicks on a link in the newsletter and visits your website.

  Important note : if you do not track your campaigns, it will result in a bad interpretation of your data within Piwik as you will get webmail services or direct entries as referrer instead of your newsletter campaign.

  Step 3 – Measure emailing performances on your website

  Thanks to Piwik URL campaign parameters, you can now clearly identify the traffic brought through your emailing. You can now specifically isolate users who come from emails by creating a segment :

  

  Once done, you can either have a look at each user specifically through the visitor log report or analyze it as a whole within the rest of the reports.

  You can even measure your return on investment directly if goals have been defined. In order to know more about how to track goals within Piwik.

  Did you like this article ?

  If you enjoyed reading this article, do not hesitate to share it around you. Moreover, if there are any topics you would like to write us about in particular, just drop us an email and we will be more than happy to write about it.

• C++ OpenCV 3.4 / FFMPEG 3.4.1 VideoWriter and MP4 Output File Format

  11 janvier 2019, par PhilBot

  I’m running on an ARM BeagleBone X-15 Debian machine with Linux Kernel 4.9.35-ti-r44. In my C++ ( Qt 5 ) application, I want to save my cv::Mat frames to an MP4 format video. I have libx264 installed and compiled from scratch both ffmpeg and OpenCv. I can successfully record and view video with MJPEG with the AVI video container type but not MP4. Whenever I try to write an MP4 video, I get run time errors of the form :

  OpenCV: FFMPEG: tag 0x44495658/'XVID' is not supported with codec id 13 and format 'mp4 / MP4 (MPEG-4 Part 14)'
  
  OpenCV: FFMPEG: fallback to use tag 0x00000020/' ???'

  I’ve tried various Google answers but none have worked.

  Relevant code :

  cv::Size frameSize = frame.size();
  
  
  
  qDebug() << "Initializing Video Recording to save Video file here: " << destinationFileName;
  
  
  
  std::string filename = destinationFileName.toStdString();
  
  //int fcc =   CV_FOURCC('M','J','P','G');
  
  //int fcc =   CV_FOURCC('X','2','6','4');
  
  int fcc = CV_FOURCC('X','V','I','D');
  
  int fps =   1;
  
  videoRecorder = new cv::VideoWriter(filename,fcc,fps,frameSize);
  
  
  
  ...
  
  
  
  videoRecorder->write(frame);

  I’ve downloaded and built the latest OpenCV 3.4 but the problem persists.
  How can I write to an MP4 File with OpenCV’s video writer ?

  When I try the ’X’,’2’,’6’,’4’ format I get the error :

      Initializing Video Recording to save Video file here:  "/tmp/Garage.mp4"
  
  OpenCV: FFMPEG: tag 0x34363258/'X264' is not supported with codec id 28 and format 'mp4 / MP4 (MPEG-4 Part 14)'
  
  OpenCV: FFMPEG: fallback to use tag 0x31637661/'avc1'
  
  [h264_v4l2m2m @ 0x81042020] Could not find a valid device
  
  [h264_v4l2m2m @ 0x81042020] can't configure encoder
  
  Could not open codec 'h264_v4l2m2m': Unspecified error
  
  Starting

  When I try the ’X’,’V’,’I’,’D’ format I get the error :

  Initializing Video Recording to save Video file here:  "/tmp/Garage.mp4"
  
  OpenCV: FFMPEG: tag 0x44495658/'XVID' is not supported with codec id 13 and format 'mp4 / MP4 (MPEG-4 Part 14)'
  
  OpenCV: FFMPEG: fallback to use tag 0x7634706d/'mp4v'
  
  Starting

  When I try the ’M’,’P’,’E’,’G’ format I get the error :

  Initializing Video Recording to save Video file here:  "/tmp/Garage.mp4"
  
  OpenCV: FFMPEG: tag 0x4745504d/'MPEG' is not supported with codec id 2 and format 'mp4 / MP4 (MPEG-4 Part 14)'
  
  OpenCV: FFMPEG: fallback to use tag 0x7634706d/'mp4v'
  
  Starting

  When I try the ’H’,’2’,’6’,’4’ format I get the error :

  OpenCV: FFMPEG: tag 0x34363248/'H264' is not supported with codec id 28 and format 'mp4 / MP4 (MPEG-4 Part 14)'
  
  OpenCV: FFMPEG: fallback to use tag 0x31637661/'avc1'
  
  [h264_v4l2m2m @ 0x7fdde340] Could not find a valid device
  
  [h264_v4l2m2m @ 0x7fdde340] can't configure encoder
  
  Could not open codec 'h264_v4l2m2m': Unspecified error
  
  Starting

  When I try the ’M’,’P’,’4’,’V’ format I get the error :

  Initializing Video Recording to save Video file here:  "/tmp/Garage.mp4"
  
  OpenCV: FFMPEG: tag 0x5634504d/'MP4V' is not supported with codec id 13 and format 'mp4 / MP4 (MPEG-4 Part 14)'
  
  OpenCV: FFMPEG: fallback to use tag 0x7634706d/'mp4v'
  
  Starting

  When I try the ’A’,’V’,’C’,’1’ format I get the error :

  Initializing Video Recording to save Video file here:  "/tmp/Garage.mp4"
  
  OpenCV: FFMPEG: tag 0x31435641/'AVC1' is not supported with codec id 28 and format 'mp4 / MP4 (MPEG-4 Part 14)'
  
  OpenCV: FFMPEG: fallback to use tag 0x31637661/'avc1'
  
  [h264_v4l2m2m @ 0x810f5f50] Could not find a valid device
  
  [h264_v4l2m2m @ 0x810f5f50] can't configure encoder
  
  Could not open codec 'h264_v4l2m2m': Unspecified error
  
  Starting

  When I try the ’D’,’I’,’V’,’X’ format I get the error :

  Initializing Video Recording to save Video file here:  "/tmp/Garage.mp4"
  
  OpenCV: FFMPEG: tag 0x58564944/'DIVX' is not supported with codec id 13 and format 'mp4 / MP4 (MPEG-4 Part 14)'
  
  OpenCV: FFMPEG: fallback to use tag 0x7634706d/'mp4v'
  
  Starting

  When I try the 0x21 format I get the error :

  Initializing Video Recording to save Video file here:  "/tmp/Garage.mp4"
  
  OpenCV: FFMPEG: tag 0x00000021/'!???' is not found (format 'mp4 / MP4 (MPEG-4 Part 14)')'
  
  Starting

  Here is my complete class which shows all tried formats :

      #include "downloader.h"
  
  
  
  Downloader::Downloader(QString url, QString destinationFile) : downloadUrl(url) , destinationFileName(destinationFile)
  
  {
  
  
  
      didInitializeVideoWriter = false;
  
  
  
      qDebug() << "Initialized Downloader...";
  
  
  
  }
  
  
  
  Downloader::~Downloader() {
  
  
  
      videoRecorder->release();
  
      delete videoRecorder;
  
  
  
  }
  
  
  
  void Downloader::doDownload()
  
  {
  
      networkManager = new QNetworkAccessManager(this);
  
  
  
      connect(networkManager, SIGNAL(finished(QNetworkReply*)),
  
              this, SLOT(replyFinished(QNetworkReply*)));
  
  
  
      networkManager->get(QNetworkRequest(QUrl(downloadUrl)));
  
  }
  
  
  
  void Downloader::writeFrame(cv::Mat frame) {
  
  
  
      QMutexLocker locker(&videoFrameMutex);
  
  
  
      videoRecorder->write(frame);
  
  
  
  }
  
  
  
  void Downloader::replyFinished(QNetworkReply *reply)
  
  {
  
  
  
      if(reply->error())
  
      {
  
          qDebug() << "ERROR!";
  
          qDebug() << reply->errorString();
  
      }
  
      else
  
      {
  
          //qDebug() << reply->header(QNetworkRequest::ContentTypeHeader).toString();
  
          //qDebug() << reply->header(QNetworkRequest::LastModifiedHeader).toDateTime().toString();
  
          //qDebug() << reply->header(QNetworkRequest::ContentLengthHeader).toULongLong();
  
          qDebug() << reply->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt();
  
          qDebug() << reply->attribute(QNetworkRequest::HttpReasonPhraseAttribute).toString();
  
  
  
          QString tempFileName = destinationFileName;
  
          QString jpegTempFilename = QString("%1").arg(tempFileName.replace("mp4","jpeg"));
  
  
  
          qDebug() << "Overwriting: " << jpegTempFilename;
  
          QFile *file = new QFile(jpegTempFilename);
  
          if(file->open(QFile::WriteOnly))
  
          {
  
              file->write(reply->readAll());
  
              file->flush();
  
              file->close();
  
          }
  
          delete file;
  
  
  
          cv::Mat frame = imread(jpegTempFilename.toStdString(), CV_LOAD_IMAGE_COLOR);   // CV_LOAD_IMAGE_COLOR (>0) loads the image in the BGR format
  
          cv::cvtColor(frame,frame,CV_BGR2RGB);
  
  
  
          // Now lazy load the recorder
  
          if ( !didInitializeVideoWriter ) {
  
  
  
              cv::Size frameSize = frame.size();
  
  
  
              qDebug() << "Initializing Video Recording to save Video file here: " << destinationFileName;
  
  
  
              std::string filename = destinationFileName.toStdString();
  
              //int fcc =   CV_FOURCC('M','J','P','G');
  
              int fcc =   CV_FOURCC('X','2','6','4');
  
              //int fcc = CV_FOURCC('X','V','I','D');
  
              //int fcc = CV_FOURCC('M','P','E','G');
  
              //int fcc = CV_FOURCC('H','2','6','4');
  
              //int fcc = CV_FOURCC('M','P','4','V');
  
              //int fcc = CV_FOURCC('A','V','C','1');
  
              //int fcc = CV_FOURCC('D','I','V','X');
  
              //int fcc = 0x21;
  
              //int fcc = 0x00000021;
  
              int fps =   1;
  
              videoRecorder = new cv::VideoWriter(filename,fcc,fps,frameSize);
  
  
  
              qDebug() << "Starting";
  
              frameCounter = 1;
  
              performanceTimer.start();
  
  
  
              didInitializeVideoWriter = true;
  
  
  
          }
  
  
  
          cv::putText(frame,"[REC]",cv::Point(50,50),5,1,cv::Scalar(0,0,225));
  
  
  
          QFuture<void> backgroundRun = QtConcurrent::run(this, &amp;Downloader::writeFrame, frame);
  
          //backgroundRun.waitForFinished();
  
  
  
      }
  
  
  
      reply->deleteLater();
  
  
  
      qDebug() &lt;&lt; "RequestTimer: " &lt;&lt; performanceTimer.elapsed() &lt;&lt; frameCounter;
  
  
  
      // Requests Again
  
      networkManager->get(QNetworkRequest(QUrl(downloadUrl)));
  
  
  
      frameCounter++;
  
  
  
      performanceTimer.restart();
  
  
  
  
  
  }
  
  </void>

  Update - I tried ’a’,’v’,’c’,’1’ and unfortunately that also does not work :

  Initializing Video Recording to save Video file here:  "/tmp/Garage.mp4"
  
  [h264_v4l2m2m @ 0x810f6aa0] Could not find a valid device
  
  [h264_v4l2m2m @ 0x810f6aa0] can't configure encoder
  
  Could not open codec 'h264_v4l2m2m': Unspecified error
  
  
  
  (qt-downloader:6234): GStreamer-CRITICAL **: gst_element_make_from_uri: assertion 'gst_uri_is_valid (uri)' failed
  
  OpenCV Error: Unspecified error (GStreamer: cannot link elements
  
  ) in CvVideoWriter_GStreamer::open, file /media/usb/opencv/modules/videoio/src/cap_gstreamer.cpp, line 1635
  
  VIDEOIO(cvCreateVideoWriter_GStreamer (filename, fourcc, fps, frameSize, is_color)): raised OpenCV exception:
  
  
  
  /media/usb/opencv/modules/videoio/src/cap_gstreamer.cpp:1635: error: (-2) GStreamer: cannot link elements
  
   in function CvVideoWriter_GStreamer::open

  When I try the X264 FOURCC, the mp4 file is 48 bytes and never grows :

  Initializing Video Recording to save Video file here:  "/tmp/Garage.mp4"
  
  OpenCV: FFMPEG: tag 0x34363258/'X264' is not supported with codec id 27 and format 'mp4 / MP4 (MPEG-4 Part 14)'
  
  OpenCV: FFMPEG: fallback to use tag 0x31637661/'avc1'

  Static Size :

  debian@BeagleBoard-X15:/tmp$ ls -lrt Garage.*
  
  -rw-r--r-- 1 debian debian     48 Dec 24 21:13 Garage.mp4
  
  -rw-r--r-- 1 debian debian 100424 Dec 24 21:14 Garage.jpeg
  
  debian@BeagleBoard-X15:/tmp$ hexdump Garage.mp4 
  
  0000000 0000 2000 7466 7079 7369 6d6f 0000 0002
  
  0000010 7369 6d6f 7369 326f 7661 3163 706d 3134
  
  0000020 0000 0800 7266 6565 0000 0000 646d 7461
  
  0000030

  Here is my ffmpeg build conf :

  debian@BeagleBoard-X15:/tmp$ ffmpeg -buildconf
  
  ffmpeg version N-89524-g74f408cc8e Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 6.3.0 (Debian 6.3.0-18) 20170516
  
    configuration: --enable-gpl --enable-libx264 --enable-pthreads --enable-static --extra-cflags=-I./x264/include --extra-ldflags=-L./x264/lib --extra-libs=-ldl
  
    libavutil      56.  6.100 / 56.  6.100
  
    libavcodec     58.  8.100 / 58.  8.100
  
    libavformat    58.  3.100 / 58.  3.100
  
    libavdevice    58.  0.100 / 58.  0.100
  
    libavfilter     7.  7.100 /  7.  7.100
  
    libswscale      5.  0.101 /  5.  0.101
  
    libswresample   3.  0.101 /  3.  0.101
  
    libpostproc    55.  0.100 / 55.  0.100
  
  
  
    configuration:
  
      --enable-gpl
  
      --enable-libx264
  
      --enable-pthreads
  
      --enable-static
  
      --extra-cflags=-I./x264/include
  
      --extra-ldflags=-L./x264/lib
  
      --extra-libs=-ldl

• FFMPEG ALSA xrun crash

  13 décembre 2017, par Liam Martens

  I’m running a YouTube RTMP stream using FFMPEG with x11grab and an alsa loopback device but sometimes after let’s say 20 hours there is an ALSA xrun and then the ffmpeg command crashes, but I’m not sure why or how this happens. (mind you the ffmpeg command does not run continuously it gets restarted automatically every so often, but the xrun makes the command crash causing the stream to go offline sometimes because a crash restart is not fast enough)

  I’m using thread_queue_size and I’ve even manually compiled ffmpeg with a higher ALSA BUFFER SIZE, but the issue appears to persist still. Besides this I’ve also scoured many posts with people having similar issues but these never really seem to end up resolved.

  This is the stream command

  ffmpeg -loglevel verbose -f alsa -thread_queue_size 12288 -ac 2 -i hw:Loopback,1,0 \
  
           -probesize 10M -f x11grab -field_order tt -thread_queue_size 12288 -video_size 1280x720 -r 30 -i :1.1 \
  
          -c:v libx264 -c:a libmp3lame -shortest -tune fastdecode -tune zerolatency \
  
          -crf 26 -pix_fmt yuv420p -threads 0 -maxrate 2500k -bufsize 2500k -pass 1 -af aresample=async=1 \
  
          -movflags +faststart -flags +global_header -preset ultrafast -r 30 -g 60 -b:v 2000k -b:a 192k -ar 44100 \
  
          -f flv -rtmp_live live rtmp://a.rtmp.youtube.com/live2/{KEY}

  Log excerpt

  ffmpeg version N-89463-gc7a5e80 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 6.3.0 (Debian 6.3.0-18) 20170516
  
    configuration: --prefix=/usr --enable-avresample --enable-avfilter --enable-gpl --enable-libmp3lame --enable-librtmp --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libtheora --enable-postproc --enable-pic --enable-pthreads --enable-shared --disable-stripping --disable-static --enable-vaapi --enable-libopus --enable-libfreetype --enable-libfontconfig --enable-libpulse --disable-debug
  
    libavutil      56.  5.100 / 56.  5.100
  
    libavcodec     58.  6.103 / 58.  6.103
  
    libavformat    58.  3.100 / 58.  3.100
  
    libavdevice    58.  0.100 / 58.  0.100
  
    libavfilter     7.  7.100 /  7.  7.100
  
    libavresample   4.  0.  0 /  4.  0.  0
  
    libswscale      5.  0.101 /  5.  0.101
  
    libswresample   3.  0.101 /  3.  0.101
  
    libpostproc    55.  0.100 / 55.  0.100
  
  Guessed Channel Layout for Input Stream #0.0 : stereo
  
  Input #0, alsa, from 'hw:Loopback,1,0':
  
    Duration: N/A, start: 1513163617.594224, bitrate: 1536 kb/s
  
      Stream #0:0: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
  
  Input #1, x11grab, from ':1.1':
  
    Duration: N/A, start: 1513163617.632434, bitrate: N/A
  
      Stream #1:0: Video: rawvideo, 1 reference frame (BGR[0] / 0x524742), bgr0(top first), 854x480, 30 fps, 30 tbr, 1000k tbn, 1000k tbc
  
  Parsing...
  
  Parsed protocol: 0
  
  Parsed host    : a.rtmp.youtube.com
  
  Parsed app     : live2
  
  RTMP_Connect1, ... connected, handshaking
  
  HandShake: Type Answer   : 03
  
  HandShake: Server Uptime : 0
  
  HandShake: FMS Version   : 4.0.0.1
  
  HandShake: Handshaking finished....
  
  RTMP_Connect1, handshaked
  
  Invoking connect
  
  HandleServerBW: server BW = 2500000
  
  HandleClientBW: client BW = 10000000 2
  
  HandleChangeChunkSize, received: chunk size change to 256
  
  RTMP_ClientPacket, received: invoke 240 bytes
  
  (object begin)
  
  Property: 
  
  Property: 
  
  Property: 
  
  (object begin)
  
  Property: 3,5,3,824>
  
  Property: 
  
  Property: 
  
  (object end)
  
  Property: 
  
  (object begin)
  
  Property: 
  
  Property: 
  
  Property: 
  
  Property: 
  
  Property: 
  
  (object begin)
  
  Property: 
  
  (object end)
  
  (object end)
  
  (object end)
  
  HandleInvoke, server invoking <_result>
  
  HandleInvoke, received result for method call <connect>
  
  Invoking releaseStream
  
  Invoking FCPublish
  
  Invoking createStream
  
  RTMP_ClientPacket, received: invoke 21 bytes
  
  (object begin)
  
  Property: 
  
  Property: 
  
  Property: NULL
  
  (object end)
  
  HandleInvoke, server invoking <onbwdone>
  
  Invoking _checkbw
  
  RTMP_ClientPacket, received: invoke 29 bytes
  
  (object begin)
  
  Property: 
  
  Property: 
  
  Property: NULL
  
  Property: 
  
  (object end)
  
  HandleInvoke, server invoking &lt;_result>
  
  HandleInvoke, received result for method call <createstream>
  
  Invoking publish
  
  RTMP_ClientPacket, received: invoke 73 bytes
  
  (object begin)
  
  Property: 
  
  Property: 
  
  Property: NULL
  
  Property: 
  
  (object begin)
  
  Property: 
  
  Property: 
  
  (object end)
  
  (object end)
  
  HandleInvoke, server invoking <onstatus>
  
  HandleInvoke, onStatus: NetStream.Publish.Start
  
  Stream mapping:
  
    Stream #1:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
  
    Stream #0:0 -> #0:1 (pcm_s16le (native) -> mp3 (libmp3lame))
  
  Press [q] to stop, [?] for help
  
  [graph 0 input from stream 1:0 @ 0x5607d087e060] w:854 h:480 pixfmt:bgr0 tb:1/30 fr:30/1 sar:0/1 sws_param:flags=2
  
  [auto_scaler_0 @ 0x5607d087d800] w:iw h:ih flags:'bicubic' interl:0
  
  [format @ 0x5607d087ed40] auto-inserting filter 'auto_scaler_0' between the filter 'Parsed_null_0' and the filter 'format'
  
  [auto_scaler_0 @ 0x5607d087d800] w:854 h:480 fmt:bgr0 sar:0/1 -> w:854 h:480 fmt:yuv420p sar:0/1 flags:0x4
  
  [swscaler @ 0x5607d0880260] Warning: data is not aligned! This can lead to a speed loss
  
  [libx264 @ 0x5607d08684e0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
  
  [libx264 @ 0x5607d08684e0] profile Constrained Baseline, level 3.1
  
  [libx264 @ 0x5607d08684e0] 264 - core 148 r2748 97eaef2 - H.264/MPEG-4 AVC codec - Copyleft 2003-2016 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=2 lookahead_threads=2 sliced_threads=1 slices=2 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=60 keyint_min=6 scenecut=0 intra_refresh=0 rc_lookahead=0 rc=crf mbtree=0 crf=26.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 vbv_maxrate=1500 vbv_bufsize=1500 crf_max=0.0 nal_hrd=none filler=0 ip_ratio=1.40 aq=0
  
  [graph_1_in_0_0 @ 0x5607d091c840] tb:1/48000 samplefmt:s16 samplerate:48000 chlayout:0x3
  
  [Parsed_aresample_0 @ 0x5607d0916b40] ch:2 chl:stereo fmt:s16 r:48000Hz -> ch:2 chl:stereo fmt:s16p r:44100Hz
  
  Output #0, flv, to 'rtmp://a.rtmp.youtube.com/live2/{KEY}':
  
    Metadata:
  
      encoder         : Lavf58.3.100
  
      Stream #0:0: Video: h264 (libx264), 1 reference frame ([7][0][0][0] / 0x0007), yuv420p(top coded first (swapped)), 854x480, q=-1--1, 1000 kb/s, 30 fps, 1k tbn, 30 tbc
  
      Metadata:
  
        encoder         : Lavc58.6.103 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 1500000/0/1000000 buffer size: 1500000 vbv_delay: -1
  
      Stream #0:1: Audio: mp3 (libmp3lame) ([2][0][0][0] / 0x0002), 44100 Hz, stereo, s16p, delay 1105, 192 kb/s
  
      Metadata:
  
        encoder         : Lavc58.6.103 libmp3lame
  
  frame=   29 fps=0.0 q=17.0 size=     146kB time=00:00:00.94 bitrate=1267.3kbits/s speed=1.86x    
  
  frame=   44 fps= 44 q=18.0 size=     168kB time=00:00:01.46 bitrate= 942.4kbits/s speed=1.45x    
  
  frame=   60 fps= 40 q=16.0 size=     191kB time=00:00:01.96 bitrate= 794.8kbits/s speed= 1.3x    
  
  ...
  
  frame= 2740 fps= 30 q=17.0 size=    7993kB time=00:01:31.32 bitrate= 717.0kbits/s speed=   1x    
  
  frame= 2755 fps= 30 q=18.0 size=    8013kB time=00:01:31.82 bitrate= 714.9kbits/s speed=   1x    
  
  [alsa @ 0x5607d084d7e0] ALSA buffer xrun.
  
  </onstatus></createstream></onbwdone></connect>