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• 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

• ffmpeg : does 2 step encoding solves issues during video conversion ?

  14 novembre 2017, par Vini.g.fer

  I’m encoding several videos to x265 format to save disk storage, and on some of them some errors happen. Like these ones below :

  [h264 @ 0x285f800] error while decoding MB 15 15, bytestream -29ate=3310.7kbits/s
  
  [h264 @ 0x285f800] concealing 2434 DC, 2434 AC, 2434 MV errors in P frame
  
  [matroska,webm @ 0x22205e0] Read error at pos. 1932044330 (0x7328a82a)
  
  [h264 @ 0x27890c0] illegal short term buffer state detected
  
  [h264 @ 0x27890c0] Missing reference picture, default is 65694
  
  [h264 @ 0x27d0880] mmco: unref short failure
  
  [h264 @ 0x27d0880] error while decoding MB 63 29, bytestream -8rate=3230.1kbits/s dup=0 drop=1
  
  [h264 @ 0x27d0880] concealing 1266 DC, 1266 AC, 1266 MV errors in P frame
  
  [matroska,webm @ 0x22205e0] Read error at pos. 2048927876 (0x7a202884)
  
  [h264 @ 0x27304e0] mmco: unref short failureime=00:48:51.54 bitrate=3229.2kbits/s dup=0 drop=1
  
  [h264 @ 0x27890c0] error while decoding MB 28 35, bytestream -16ate=3177.0kbits/s dup=0 drop=1
  
  [h264 @ 0x27890c0] concealing 821 DC, 821 AC, 821 MV errors in P frame
  
  [matroska,webm @ 0x22205e0] Read error at pos. 2112109973 (0x7de43d95)
  
  [h264 @ 0x285f800] mmco: unref short failureime=00:50:36.21 bitrate=3175.5kbits/s dup=0 drop=1
  
  [h264 @ 0x27d0880] error while decoding MB 51 21, bytestream -28ate=3199.4kbits/s dup=0 drop=1
  
  [h264 @ 0x27d0880] concealing 1918 DC, 1918 AC, 1918 MV errors in P frame
  
  [matroska,webm @ 0x22205e0] Read error at pos. 2202555497 (0x83485469)
  
  [matroska,webm @ 0x22205e0] Read error at pos. 2409903171 (0x8fa43443)306.9kbits/s dup=0 drop=1
  
  [h264 @ 0x27d0880] error while decoding MB 3 30, bytestream -7
  
  [h264 @ 0x27d0880] concealing 1246 DC, 1246 AC, 1246 MV errors in P frame
  
  [h264 @ 0x27890c0] error while decoding MB 7 5, bytestream -7bitrate=3396.2kbits/s dup=0 drop=1
  
  [h264 @ 0x27890c0] concealing 3242 DC, 3242 AC, 3242 MV errors in B frame
  
  [matroska,webm @ 0x22205e0] Read error at pos. 2628527465 (0x9cac2569)
  
  [h264 @ 0x285f800] mmco: unref short failuretime=01:02:15.08 bitrate=3396.3kbits/s dup=0 drop=1
  
  [h264 @ 0x2818040] error while decoding MB 36 30, bytestream -12rate=3473.5kbits/s dup=0 drop=1
  
  [h264 @ 0x2818040] concealing 1213 DC, 1213 AC, 1213 MV errors in P frame
  
  [matroska,webm @ 0x22205e0] Read error at pos. 2874947326 (0xab5c36fe)
  
  [h264 @ 0x27890c0] error while decoding MB 46 8, bytestream -6itrate=3590.8kbits/s dup=0 drop=1
  
  [h264 @ 0x27890c0] concealing 2963 DC, 2963 AC, 2963 MV errors in B frame
  
  [matroska,webm @ 0x22205e0] Read error at pos. 3162785874 (0xbc844852)

  If I add 2-step encoding, that can fix these errors ? What exactly does 2-step encoding does ? The command I’m using is pretty much the one on this answer https://askubuntu.com/a/718300/396175 so how (which parameter) should I use to apply 2-step encoding ?

  Thanks !