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• ffmpeg on iOS using Swift : init' is unavailable : use 'withMemoryRebound(to:capacity:_)'

  28 mars 2018, par Law Gimenez

  I am having trouble understanding with the compile error below

  ’init’ is unavailable : use ’withMemoryRebound(to:capacity:_)’ to temporarily view memory as another layout-compatible type.

  in this method

  av_image_fill_arrays(UnsafeMutablePointer(frameRGB?.pointee.data.0),
  
                                                           &lineSize,
  
                                                           &dataSize,
  
                                                           AVPixelFormat(rawValue: (frameRGB?.pointee.format)!),
  
                                                           (frameRGB?.pointee.width)!,
  
                                                           (frameRGB?.pointee.height)!,
  
                                                           1)

  particularly in the UnsafeMutablePointer(frameRGB?.pointee.data.0) part.
  I am trying to migrate ffmpeg pointers, variables and methods to Swift but the resources are very limited. Thank you for the help.

• Build failed in step 'Retrieving needed toolchain components' tarballs

  1er mars 2018, par VaFancy

  I tried to build crosstool in my raspberry pi, and the procedure I followed was from How to compile FFmpeg for Raspberry Pi (Raspbian). When I finished ct-ng build(which took a very long time), an error occurred. It shows that Build failed in step 'Retrieving needed toolchain components' tarballs called in step '{top-level}'

  Here is the error I copied from build.log.

  [ERROR]  
  
  [ERROR]  >>
  
  [ERROR]  >>  Build failed in step 'Retrieving needed toolchain components' tarballs'
  
  [ERROR]  >>        called in step '(top-level)'
  
  [ERROR]  >>
  
  [ERROR]  >>  Error happened in: do_kernel_get[scripts/build/kernel/linux.sh@735]
  
  [ERROR]  >>        called from: main[scripts/crosstool-NG.sh@576]
  
  [ERROR]  >>
  
  [ERROR]  >>  For more info on this error, look at the file: 'build.log'
  
  [ERROR]  >>  There is a list of known issues, some with workarounds, in:
  
  [ERROR]  >>      '/opt/cross/share/doc/crosstool-ng/ct-ng.1.19.0/B - Known issues.txt'
  
  [ERROR] 

  How can I solve this ? Please help me, I’ve already wasted 2 days on it.

• TCL script unable to work with multiple camera on windows 7 platform

  27 novembre 2017, par M. D. P

  My TCL script works properly for single camera. the TCL script is as follow :

  proc liveStreaming {} {
  
  
  
      #open the config file.
  
      set f [open "C:/main/video_config.txt" r] 
  
  
  
      #To retrive the values from the config file.
  
      while {![eof $f]} {
  
          set part [split [gets $f] "="]
  
          set props([string trimright [lindex $part 0]]) [string trimleft [lindex $part 1]]
  
      }
  
      close $f 
  
  
  
      #camera selection to live streaming.
  
      set camera "video"
  
      append cctv $camera "=" $props(cctv)
  
  
  
      #ffmpeg command to capture live streaming in background
  
      exec ffmpeg -f dshow -s 1280x720 -i $cctv c:/test/sample.avi >& c:/test/temp.txt &
  
  
  
  }
  
  liveStreaming
  
  
  
  //above code is to capture video using ffmpeg and tcl.

  My text file "video_config" is as follow :

  cctv=Logitech HD Webcam C525

  as, i want it to run with multiple camera : the text file should be as follow :

  cctv=Integrated Webcam,Logitech HD Webcam C525

  The problem is "," (comma), my TCL script is unable to predict the coma (,) . can any one provide me the proper TCL script which can predict the coma, so that my TCL script can work with multiple camera.

  Error Report :

  ffmpeg version N-89127-g8f4702a93f Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 7.2.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-cuda --enable-cuvid --enable-d3d11va --enable-nvenc --enable-dxva2 --enable-avisynth --enable-libmfx
  
    libavutil      56.  0.100 / 56.  0.100
  
    libavcodec     58.  3.103 / 58.  3.103
  
    libavformat    58.  2.100 / 58.  2.100
  
    libavdevice    58.  0.100 / 58.  0.100
  
    libavfilter     7.  2.100 /  7.  2.100
  
    libswscale      5.  0.101 /  5.  0.101
  
    libswresample   3.  0.101 /  3.  0.101
  
    libpostproc    55.  0.100 / 55.  0.100
  
  [dshow @ 05944ac0] Could not find video device with name [Integrated Webcam,Logitech HD Webcam C525] among source devices of type video.
  
  video=Integrated Webcam,Logitech HD Webcam C525: I/O error