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• ffmpeg hls video recording timing inforamtion is inaccurate

  27 juin 2018, par Haris

  I am recording the rtsp stream in HLS format which is working fine with below command.

  ~/bin/ffmpeg -i rtsp://10.0.7.39:554/media/live/1/1 -c:a aac -c:v copy -hls_list_size 65535 -hls_time 2 live.m3u8

  But when I check the the duration of each ts file with live.m3u8 file content the value is not accurate.

  Here is the live.m3u8

  #EXTM3U
  
  #EXT-X-VERSION:3
  
  #EXT-X-TARGETDURATION:2
  
  #EXT-X-MEDIA-SEQUENCE:0
  
  #EXTINF:2.000000,
  
  live0.ts
  
  #EXTINF:2.000000,
  
  live1.ts
  
  #EXTINF:1.200000,
  
  live2.ts
  
  #EXTINF:2.500000,
  
  live3.ts
  
  #EXTINF:2.000000,
  
  live4.ts
  
  #EXTINF:2.600000,
  
  live5.ts
  
  #EXTINF:1.700000,
  
  live6.ts
  
  #EXT-X-ENDLIST

  And when I check the timing information of the ts file live2.ts using the command,

    ~/bin/ffprobe -i live2.ts -show_entries format=duration -v quiet -of csv="p=0"

  I am getting the value 2.136000 where as in m3u8 file it is 1.20000.

  I have build the latest FFMPEG based on official guild https://trac.ffmpeg.org/wiki/CompilationGuide/Ubuntu.

  OS : Ubuntu 12.04

  ffmpeg Version

  $~/bin//ffmpeg -version
  
  
  
  
  
  ffmpeg version N-91369-g4ac88ba Copyright (c) 2000-2018 the FFmpeg developers
  
  built with gcc 4.8 (Ubuntu 4.8.1-2ubuntu1~12.04)
  
  configuration: --prefix=/home/haris/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/haris/ffmpeg_build/include --extra-ldflags=-L/home/haris/ffmpeg_build/lib --extra-libs='-lpthread -lm' --bindir=/home/haris/bin --enable-gpl --enable-libaom --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-nonfree
  
  libavutil      56. 18.102 / 56. 18.102
  
  libavcodec     58. 20.104 / 58. 20.104
  
  libavformat    58. 17.101 / 58. 17.101
  
  libavdevice    58.  4.101 / 58.  4.101
  
  libavfilter     7. 25.100 /  7. 25.100
  
  libswscale      5.  2.100 /  5.  2.100
  
  libswresample   3.  2.100 /  3.  2.100
  
  libpostproc    55.  2.100 / 55.  2.100

  Note

  If I tested the same command in Ubuntu 16.04 where ffmpeg installed with apt-get every thing works fine.

  Here is the ffmpeg details

  $ ~/bin/ffmpeg -version
  
  ffmpeg version 2.8.14-0ubuntu0.16.04.1 Copyright (c) 2000-2018 the FFmpeg developers
  
  built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.9) 20160609
  
  configuration: --prefix=/usr --extra-version=0ubuntu0.16.04.1 --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

  What could be the cause, any help will be appreciated.

• Why FFmpeg transcode with strips

  15 septembre 2023, par Андрей Тернити

  I have MJPEG video. I want get VP9 webm video.

  


  ffmpeg -loglevel verbose -i "input.yuvj422p" -pix_fmt yuv420p -c:v libvpx-vp9 -crf 20 -b:v 0 constantQualityExample.webm


  


  And it works ok (right image), log :

  


  [mjpeg @ 0x55b9b4b7ea40] Format mjpeg detected only with low score of 25, misdetection possible!
Input #0, mjpeg, from 'input.yuvj422p':
  Duration: N/A, bitrate: N/A
    Stream #0:0: Video: mjpeg (Baseline), 1 reference frame, yuvj422p(pc, bt470bg/unknown/unknown, center), 1280x720 [SAR 1:1 DAR 16:9], 25 tbr, 1200k tbn, 25 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (mjpeg (native) -> vp9 (libvpx-vp9))
Press [q] to stop, [?] for help
[graph 0 input from stream 0:0 @ 0x55b9b4ba4a00] w:1280 h:720 pixfmt:yuvj422p tb:1/1200000 fr:25/1 sar:1/1
[auto_scaler_0 @ 0x55b9b4ba7c00] w:iw h:ih flags:'bicubic' interl:0
[format @ 0x55b9b4ba5800] auto-inserting filter 'auto_scaler_0' between the filter 'Parsed_null_0' and the filter 'format'
[swscaler @ 0x55b9b4ba8b00] deprecated pixel format used, make sure you did set range correctly
[auto_scaler_0 @ 0x55b9b4ba7c00] w:1280 h:720 fmt:yuvj422p sar:1/1 -> w:1280 h:720 fmt:yuv420p sar:1/1 flags:0x4
[libvpx-vp9 @ 0x55b9b4b85840] v1.7.0
[libvpx-vp9 @ 0x55b9b4b85840] --prefix=/usr --enable-pic --enable-shared --disable-install-bins --disable-install-srcs --size-limit=16384x16384 --enable-postproc --enable-multi-res-encoding --enable-temporal-denoising --enable-vp9-temporal-denoising --enable-vp9-postproc --target=x86_64-linux-gcc
Output #0, webm, to 'constantQualityExample.webm':
  Metadata:
    encoder         : Lavf58.45.100
    Stream #0:0: Video: vp9 (libvpx-vp9), 1 reference frame, yuv420p(center), 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 25 fps, 1k tbn, 25 tbc
    Metadata:
      encoder         : Lavc58.91.100 libvpx-vp9
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
No more output streams to write to, finishing.
Automatically inserted bitstream filter 'vp9_superframe'; args=''


  


  But I want the same by libav. I take official example and make a little changes to make code easy (remove audio capabilities, remove multi-video streams capabilities), my code here. But it produce video with strips and drop last frame (left image).

Mediainfo :

My example log :

  


  Input #0, jpeg_pipe, from 'input.yuvj422p':
  Duration: N/A, bitrate: N/A
  Stream #0:0: Video: mjpeg (Baseline), yuvj422p(pc, bt470bg/unknown/unknown), 1280x720 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 25 tbn
[libvpx-vp9 @ 0x5593e186fa80] v1.11.0
Output #0, webm, to 'VideoOut.webm':
  Stream #0:0: Video: vp9, yuv420p(unknown/bt470bg/unknown), 1280x720 [SAR 1:1 DAR 16:9], q=2-31, 25 tbn
[swscaler @ 0x5593e221af00] deprecated pixel format used, make sure you did set range correctly


  


  What I should change in my code to take ok result like ffmpeg ?

  


• Mobile Analytics SDK : beta release of Piwik iOS SDK

  30 octobre 2013, par Piwik team

  Mattias Levin, a Mobile developer enthusiast from Sweden, has released the first public beta version of the official Piwik SDK for iOS !

  If you are building apps for iOS or OSX, you will be able to track your App usage with Piwik. Learn more in this blog post.

  Apps & Mobile apps Analytics

  Using Piwik to track your app usage would give interesting statistics usage such as :

  • number of active users (per day, week, month, …) of my mobile or desktop app,
  • how long users spend in the app,
  • track which icons, buttons are clicked (or any other custom event),
  • record device info, operating system,
  • reports on any Custom Variables you that are relevant to your app (see examples below),
  • how often is the app opened ? When and how long is the app opened ?
  • number of new users, active users, total users,
  • record errors or exception thrown

  Piwik SDK for iOS
  

  The PiwikTracker is an Objective-C framework (for iOS and OSX) designed to send app usage data to a Piwik analytics server. It is realeased under MIT license. Piwik server is a downloadable, Free/Libre (GPLv3 licensed) real time analytics platform.

  Getting started

  1. Create a new website in the Piwik web interface called “My App”. Copy the Website ID and the token_auth.
  2. Download the PiwikTracker SDK.
  3. Add the PiwikTracker files to your project.
  4. Create and configure the PiwikTracker.
  5. Add code in your app to track screen views, events, exceptions, goals and more
  6. Let the dispatch timer dispatch pending events to the Piwik server, or dispatch events manually.

  For more info, check out the Readme.

  Requirements

  The latest PiwikTracker version uses ARC and support iOS6+ and OSX 10.7+.

  • iOS tracker depends on : Core Data, Core Location, Core Graphics, UIKit and AFNetworking.
  • OSX tracker depends on : Core Data, Core Graphics, Cocoa and AFNetworking.

  Demo project

  The workspace contains an iPhone demo app that uses and demonstrates the features available in the SDK.

  

  Feedback needed

  If you use the iOS SDK to track your app, we would like to hear your suggestions, bug reports or general feedback.

  We hope to work with you to improve the SDK and move it out of beta !

  Please report suggestions, bugs, feature requests in the Github Issues at Piwik iOS SDK.

  Happy App Analytics !