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• Connect external cameras to iOS and decompress to a usable form

  27 septembre 2017, par Ping Chen

  I want to create a 2 camera setup which can send 1 of the camera views out as an RTMP stream depending on the motion intensity detected. The chosen camera view can change if motion intensity on the views changes.

  I imagine that I could use an iPhone/iPad as encoding/streaming hub as well as 1 of the cameras. And connect a WiFi camera to the iPad/iPhone to feed the 2nd camera view.

  My goals for the iOS side are :

  1. Connect with a WiFi camera on the local network
  2. Decode the data and run motion intensity detection on the WiFi camera feed AND the iPhone/iPad’s own camera feed with Brad Larson’s GPUImage framework https://github.com/BradLarson/GPUImage
  3. Stream out the chosen camera view. depending on motion detected

  Larson’s GPUImage framework works with an AVCaptureSession subclass. I’m only familiar with AVFoundation objects, but am a complete noob with it comes to VideoToolbox and some of the lower level iOS video stuff. Through googling, I kind of know that VTDecompressionSession is what I’d get from the WiFi camera. I have no clue how I can manipulate that to a usable form for my purposes.

  I’ve dug through stackoverflow answers such as : https://stackoverflow.com/a/29525001/7097455

  Very informative, but maybe I don’t even know to ask the correct questions

• ffplay -noborder option missing argument

  10 janvier 2021, par Tomás Arturo Herrera Castro

  If I do :

  


  ffplay -i vid.mp4


  


  ffplay works fine, however if I try the borderless option :

  


  ffplay -noborder -i vid.mp4

Failed to set value '-i' for option 'noborder': Option not found


  


  Trying the -noborder option at the end of the command :

  


  ffplay -i vid.mp4 -noborder

Missing argument for option 'noborder'


  


  Any clue on the argument -noborder is waiting for or why isn't this working ?

  


  This is the ffplay version I am using :

  


  ffplay version 2.8.17-0ubuntu0.1 Copyright (c) 2003-2020 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


  


• FFMPEG using concat but process was killed no Error message

  18 mars 2020, par 김태훈

  I am android devloper
  I use FFmpeg for edit video.
  use this library

  https://github.com/bravobit/FFmpeg-Android
  just

  FFmpeg.execute(" command ");

  I use filter-complex, but process was killed with no error

  is this clue error message ?

  "`[out_0_0 @ 000002092867e200] 100 buffers queued in out_0_0, something may be wrong.`"

  Can you tell me how to fix it ?
  below is my command
  I think syntax is ok, but sementics is wrong.

  -y -i /storage/emulated/0/Download/error_movie.mp4 -filter_complex "
  
  [0:v]trim=start=20.900:duration=14.500,setpts=PTS-STARTPTS[v1]; 
  
  [0:v]trim=start=0:duration=20.900,setpts=PTS-STARTPTS[v2]; 
  
  [0:v]trim=start=35.400:duration=30.300,setpts=PTS-STARTPTS[v3]; 
  
  [0:v]trim=start=20.900:duration=14.500,setpts=PTS-STARTPTS[v4]; 
  
  [0:v]trim=start=20.900:duration=14.500,setpts=PTS-STARTPTS[v5]; 
  
  [0:a]atrim=start=20.900:duration=14.500,asetpts=PTS-STARTPTS[a1]; 
  
  [0:a]atrim=start=0:duration=20.900,setpts=PTS-STARTPTS[a2]; 
  
  [0:a]atrim=start=35.400:duration=30.300,asetpts=PTS-STARTPTS[a3]; 
  
  [0:a]atrim=start=20.900:duration=14.500,asetpts=PTS-STARTPTS[a4]; 
  
  [0:a]atrim=start=20.900:duration=14.500,asetpts=PTS-STARTPTS[a5]; 
  
  [v1][v2][v3][v4][v5]concat=n=5:v=1:a=0[ffmpegVideoOut];
  
  [a1][a2][a3][a4][a5]concat=n=5:v=0:a=1[ffmpegAudioOut]" 
  
  -map [ffmpegVideoOut] -map [ffmpegAudioOut] 
  
  /storage/emulated/0/AiTube/AiTube_20200316_103442.mp4