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• How to verify user permissions – Introducing the Piwik Platform

  9 novembre 2014, par Thomas Steur — Development

  This is the next post of our blog series where we introduce the capabilities of the Piwik platform (our previous post was How to make your plugin multilingual). This time you’ll learn how to verify user permissions. For this tutorial you will need to have basic knowledge of PHP and the Piwik platform.

  When should a plugin verify permissions ?

  Usually you want to do this before executing any action – such as deleting or fetching data – and before rendering any sensitive information that should not be accessible by everyone. For instance in an API method or Controller action. You sometimes also need to verify permissions before registering menu items or widgets.

  How does Piwik’s user management work ?

  It is quite simple as it only differentiates between a few roles : View permission, Admin permission and Super User permission. If you manage multiple websites with Piwik a user can be assigned to different roles as a user might have no permission for some websites but view or admin permission for another set of websites.

  Worth mentioning is that roles inherit from each other. This means the role admin automatically includes the role view and a super user automatically covers the view and admin role.

  Getting started

  In this post, we assume that you have already set up your development environment and created a plugin. If not, visit the Piwik Developer Zone where you’ll find the tutorial Setting up Piwik and other Guides that help you to develop a plugin.

  Verifying user permissions

  To protect your data the platform offers many convenient methods in the \Piwik\Piwik class. There you will find methods that either start with check, is or has. While methods that start with check throw an exception in case a condition is not met, the other methods return a boolean true or false.

  Use methods that throw an exception if you want to stop any further execution in case a user does not have an appropriate role. The platform will catch the exception and display an error message or ask the user to log in.

  public function deleteAllMessages()
  {
      // delete messages only if user has super user access, otherwise show an error message
      Piwik::checkUserSuperUserAccess();
   
      $this->getModel()->deleteAllMessages();
  }
  Télécharger

  Use methods that return a boolean for instance when registering menu items or widgets.

  public function configureAdminMenu(MenuAdmin $menu)
  {
      if (Piwik::hasUserSuperUserAccess()) {
          $menu->addPlatformItem('Plugins', $this->urlForDefaultAction());
      }
  }
  Télécharger

  It is important to be aware that just because the menu item won’t be displayed in the UI a user can still open the registered URL manually. Therefore you have to check for permissions in the actual controller action as well.

  View permission

  A user having a view permission should be only able to view reports but not make any changes apart from his personal settings. The methods that end with UserHasSomeViewAccess make sure a user has at least view permission for one website whereas the methods *UserHasViewAccess($idSites = array(1,2,3)) check whether a user has view access for all of the given websites.

  Piwik::checkUserHasSomeViewAccess();
   
  Piwik::checkUserHasViewAccess($idSites = array(1,2,3));
  Télécharger

  As a plugin developer you would usually use the latter example to verify the permissions for specific websites. Use the first example in case you develop something like an “All Websites Dashboard” where you only want to make sure the user has a view permission for at least one website.

  Admin permission

  A user having an admin permission cannot only view reports but also change website related settings. The methods to check for this role are similar to the ones before, just swap the term View with Admin.

  Piwik::checkUserHasSomeAdminAccess();
   
  Piwik::checkUserHasAdminAccess($idSites = array(1,2,3));
  Télécharger

  Super user permission

  A user having the super user permission is allowed to access all of the data stored in Piwik and change any settings. To check if a user has this role use one of the methods that end with UserSuperUserAccess.

  Piwik::checkUserHasSuperUserAccess();

  As a plugin developer you would check for this permission for instance in places where your plugin shows an activity log over all users or where it offers the possibility to change any system wide settings.

  Getting information about the currently logged in user

  Sometimes you might want to know which user is currently logged in. This can be useful if you want to persist user related information in the database or if you want to send an email to the currently logged in user. You can easily get this information by calling the following methods :

  $login = Piwik::getCurrentUserLogin()
  $email = Piwik::getCurrentUserEmail()
  Télécharger

  Advanced features

  Of course there is more that you can do. For instance you can verify whether a user is an anonymous user or whether a user has a specific role. You can also perform any operation in the context of a super user even if the current user does not have this role. Would you like to know more about those features ? Check out the Piwik class reference, the Security guide and the Manage Users user guide.

  If you have any feedback regarding our APIs or our guides in the Developer Zone feel free to send it to us.

• FFmpeg : Invalid buffer size when streaming to Twitch

  1er décembre 2020, par user1965074

  I am streaming a 2560x1440 @ 24FPS to Twitch with this command :

  


  ffmpeg \
>     -f rawvideo \
>     -vcodec rawvideo \
>     -s 2560x1440 \
>     -pix_fmt bgr24 \
>     -r "24" \
>     -i 20200818-074700.mp4 \
>     -f flv \
>     -vcodec libx264 \
>     -profile:v main \
>     -g 48 \
>     -keyint_min 24 \
>     -b:v 4500k \
>     -minrate 4500k \
>     -maxrate 4500k \
>     -pix_fmt yuv420p \
>     -preset ultrafast \
>     -tune zerolatency \
>     -threads 0 \
>     -bufsize 4500k \
>     rtmp://live-arn.twitch.tv/app/{KEY}


  


  It fails with message Invalid buffer size, packet size 9137374 < expected frame_size 11059200. Given the error message, I have tried decreasing and increasing the 4500k in all places of the command as explained in this answer but it does not help.

  


  Here is the full log

  


  ffmpeg version 2.8.17-0ubuntu0.1 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.12) 20160609
  configuration: --prefix=/usr --extra-version=0ubuntu0.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv
  libavutil      54. 31.100 / 54. 31.100
  libavcodec     56. 60.100 / 56. 60.100
  libavformat    56. 40.101 / 56. 40.101
  libavdevice    56.  4.100 / 56.  4.100
  libavfilter     5. 40.101 /  5. 40.101
  libavresample   2.  1.  0 /  2.  1.  0
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  2.101 /  1.  2.101
  libpostproc    53.  3.100 / 53.  3.100
[rawvideo @ 0xfb3120] Estimating duration from bitrate, this may be inaccurate
Input #0, rawvideo, from '20200818-074700.mp4':
  Duration: 00:00:02.96, start: 0.000000, bitrate: 2118169 kb/s
    Stream #0:0: Video: rawvideo (BGR[24] / 0x18524742), bgr24, 2560x1440, 2123366 kb/s, 24 tbr, 24 tbn, 24 tbc
[libx264 @ 0xfbdfc0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
[libx264 @ 0xfbdfc0] profile Constrained Baseline, level 5.0
[libx264 @ 0xfbdfc0] 264 - core 148 r2643 5c65704 - H.264/MPEG-4 AVC codec - Copyleft 2003-2015 - 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=22 lookahead_threads=16 sliced_threads=1 slices=22 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=48 keyint_min=24 scenecut=0 intra_refresh=0 rc_lookahead=0 rc=cbr mbtree=0 bitrate=4500 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 vbv_maxrate=4500 vbv_bufsize=4500 nal_hrd=none filler=0 ip_ratio=1.40 aq=0
Output #0, flv, to 'rtmp://live-arn.twitch.tv/app/{KEY}':
  Metadata:
    encoder         : Lavf56.40.101
    Stream #0:0: Video: h264 (libx264) ([7][0][0][0] / 0x0007), yuv420p, 2560x1440, q=-1--1, 4500 kb/s, 24 fps, 1k tbn, 24 tbc
    Metadata:
      encoder         : Lavc56.60.100 libx264
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[libx264 @ 0xfbdfc0] VBV underflow (frame 0, -1827312 bits)
Truncating packet of size 11059200 to 9137375me=00:00:02.33 bitrate=6051.7kbits/s    
[rawvideo @ 0xfbca80] Invalid buffer size, packet size 9137374 < expected frame_size 11059200
Error while decoding stream #0:0: Invalid argument
[flv @ 0xfbd020] Failed to update header with correct duration.
[flv @ 0xfbd020] Failed to update header with correct filesize.
frame=   70 fps= 54 q=52.0 Lsize=    2029kB time=00:00:02.91 bitrate=5698.4kbits/s    
video:2026kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.152412%
[libx264 @ 0xfbdfc0] frame I:2     Avg QP:47.09  size:381468
[libx264 @ 0xfbdfc0] frame P:68    Avg QP:51.00  size: 19279
[libx264 @ 0xfbdfc0] mb I  I16..4: 100.0%  0.0%  0.0%
[libx264 @ 0xfbdfc0] mb P  I16..4: 14.1%  0.0%  0.0%  P16..4:  2.7%  0.0%  0.0%  0.0%  0.0%    skip:83.2%
[libx264 @ 0xfbdfc0] coded y,uvDC,uvAC intra: 8.2% 94.6% 83.0% inter: 0.0% 3.2% 0.7%
[libx264 @ 0xfbdfc0] i16 v,h,dc,p: 87%  1% 12%  0%
[libx264 @ 0xfbdfc0] i8c dc,h,v,p: 98%  1%  2%  0%
[libx264 @ 0xfbdfc0] kb/s:5688.52


  


• How can i create a portrait video using Android's MediaRecorder

  23 mars 2015, par urudroid

  I have an Android application which is able to record and play a videos in portrait mode, those features are working fine on Android phones.

  The issue comes up because this video is needed to be played also on iOS devices (after being shared through a server).

  iOS is not correctly showing the video as it looks "cropped", but videos recorded on iOS are played without issues.

  So, the main difference between videos created on Android and iOS’ is the size and the rotation.

  Im using CWAC-Camera library for preview and recording and ffmpeg to scale the video down to 320x568px (as this is the standard size for both Android and iOS apps).

  Here is the metadata from an video created from Android :

  General
  
  Complete name                            : android_video.mp4
  
  Format                                   : MPEG-4
  
  Format profile                           : Base Media
  
  Codec ID                                 : isom
  
  File size                                : 447 KiB
  
  Duration                                 : 5s 596ms
  
  Overall bit rate                         : 654 Kbps
  
  Encoded date                             : UTC 1904-01-01 00:00:00
  
  Tagged date                              : UTC 1904-01-01 00:00:00
  
  Writing application                      : Lavf56.4.101
  
  
  
  Video
  
  ID                                       : 1
  
  Format                                   : AVC
  
  Format/Info                              : Advanced Video Codec
  
  Format profile                           : High@L2.1
  
  Format settings, CABAC                   : Yes
  
  Format settings, ReFrames                : 4 frames
  
  Codec ID                                 : avc1
  
  Codec ID/Info                            : Advanced Video Coding
  
  Duration                                 : 5s 406ms
  
  Bit rate                                 : 536 Kbps
  
  Width                                    : 568 pixels
  
  Height                                   : 320 pixels
  
  Display aspect ratio                     : 16:9
  
  Original display aspect ratio            : 16:9
  
  Rotation                                 : 270°
  
  Frame rate mode                          : Constant
  
  Frame rate                               : 14.985 fps
  
  Color space                              : YUV
  
  Chroma subsampling                       : 4:2:0
  
  Bit depth                                : 8 bits
  
  Scan type                                : Progressive
  
  Bits/(Pixel*Frame)                       : 0.197
  
  Stream size                              : 354 KiB (79%)
  
  Writing library                          : x264 core 142
  
  Encoding settings                        : cabac=1 / ref=3 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=7 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=6 / lookahead_threads=1 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=2 / keyint=250 / keyint_min=14 / scenecut=40 / intra_refresh=0 / rc_lookahead=40 / rc=crf / mbtree=1 / crf=23.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00
  
  Language                                 : English
  
  Encoded date                             : UTC 1904-01-01 00:00:00
  
  Tagged date                              : UTC 1904-01-01 00:00:00
  
  
  
  Audio
  
  ID                                       : 2
  
  Format                                   : AAC
  
  Format/Info                              : Advanced Audio Codec
  
  Format profile                           : LC
  
  Codec ID                                 : 40
  
  Duration                                 : 5s 596ms
  
  Bit rate mode                            : Constant
  
  Bit rate                                 : 132 Kbps
  
  Channel(s)                               : 2 channels
  
  Channel(s)_Original                      : 1 channel
  
  Channel positions                        : Front: C
  
  Sampling rate                            : 44.1 KHz
  
  Compression mode                         : Lossy
  
  Stream size                              : 89.4 KiB (20%)
  
  Language                                 : English
  
  Encoded date                             : UTC 1904-01-01 00:00:00
  
  Tagged date                              : UTC 1904-01-01 00:00:00

  And here is the metadata from the video created on iOS :

  General
  
  Complete name                            : ios_video.mp4
  
  Format                                   : MPEG-4
  
  Format profile                           : Base Media / Version 2
  
  Codec ID                                 : mp42
  
  File size                                : 673 KiB
  
  Duration                                 : 7s 38ms
  
  Overall bit rate                         : 783 Kbps
  
  Encoded date                             : UTC 2015-03-17 19:16:36
  
  Tagged date                              : UTC 2015-03-17 19:16:37
  
  
  
  Video
  
  ID                                       : 2
  
  Format                                   : AVC
  
  Format/Info                              : Advanced Video Codec
  
  Format profile                           : Main@L3.0
  
  Format settings, CABAC                   : Yes
  
  Format settings, ReFrames                : 2 frames
  
  Codec ID                                 : avc1
  
  Codec ID/Info                            : Advanced Video Coding
  
  Duration                                 : 7s 33ms
  
  Bit rate                                 : 711 Kbps
  
  Width                                    : 320 pixels
  
  Height                                   : 568 pixels
  
  Display aspect ratio                     : 0.563
  
  Frame rate mode                          : Constant
  
  Frame rate                               : 30.000 fps
  
  Color space                              : YUV
  
  Chroma subsampling                       : 4:2:0
  
  Bit depth                                : 8 bits
  
  Scan type                                : Progressive
  
  Bits/(Pixel*Frame)                       : 0.130
  
  Stream size                              : 610 KiB (91%)
  
  Title                                    : Core Media Video
  
  Encoded date                             : UTC 2015-03-17 19:16:36
  
  Tagged date                              : UTC 2015-03-17 19:16:37
  
  Color primaries                          : BT.709
  
  Transfer characteristics                 : BT.709
  
  Matrix coefficients                      : BT.709
  
  Color range                              : Limited
  
  
  
  Audio
  
  ID                                       : 1
  
  Format                                   : AAC
  
  Format/Info                              : Advanced Audio Codec
  
  Format profile                           : LC
  
  Codec ID                                 : 40
  
  Duration                                 : 7s 38ms
  
  Source duration                          : 7s 105ms
  
  Bit rate mode                            : Constant
  
  Bit rate                                 : 64.0 Kbps
  
  Channel(s)                               : 2 channels
  
  Channel(s)_Original                      : 1 channel
  
  Channel positions                        : Front: C
  
  Sampling rate                            : 44.1 KHz
  
  Compression mode                         : Lossy
  
  Stream size                              : 56.8 KiB (8%)
  
  Source stream size                       : 57.2 KiB (9%)
  
  Title                                    : Core Media Audio
  
  Encoded date                             : UTC 2015-03-17 19:16:36
  
  Tagged date                              : UTC 2015-03-17 19:16:37

  The values width and height are inverted on Android, also the Rotation parameter is set to 270º (this is the rotation parameter for portrait videos).

  This is a sketch of how iOS’ videos look on iOS app :

  

  And this is how Android’s videos look on iOS app :

  

  So, in order to get the videos correctly displayed both on iOS and Android i need to be able to set the width to 320 and height to 568 on Android. I tried it from several places (outside and inside CWAC-Camera library) but i always get a Camera.Parameters error.

  It is possible to do this on Android ?

  EDIT :

  This is the result i get when i set the rotation to 0 with ffmpeg :