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• How to repair a raw H.264 stream using FFmpeg

  13 janvier 2020, par Chris Kennedy

  I apologize if I start rambling or seem incoherent.

  Preface : My house caught on fire last week.

  I have been trying to get the footage off my security camera system (Zmodo, don’t ever buy this crap) to share with the fire marshal and my insurance. I can’t get it off the "proper" way because the box doesn’t detect any drive or any file system I throw at it, and none of their viewing apps (for Android or Windows) allow video downloads.

  I was able to get the files directly from the system’s hard drive, but they’re (of course) messed up in such a way that I can’t just open up VLC (or even Zmodo’s own viewing software !) and view them. I have spent several hours scouring the web for various ways to run it through FFmpeg to see if it can repair the file, but I’ve had no luck so far and my mind is already stretched thin with everything else.

  This is the output from ffprobe :

  ffprobe version 4.2.1 Copyright (c) 2007-2019 the FFmpeg developers
  
    built with gcc 9.1.1 (GCC) 20190807
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --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-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
  
    libavutil      56. 31.100 / 56. 31.100
  
    libavcodec     58. 54.100 / 58. 54.100
  
    libavformat    58. 29.100 / 58. 29.100
  
    libavdevice    58.  8.100 / 58.  8.100
  
    libavfilter     7. 57.100 /  7. 57.100
  
    libswscale      5.  5.100 /  5.  5.100
  
    libswresample   3.  5.100 /  3.  5.100
  
    libpostproc    55.  5.100 / 55.  5.100
  
  [h264 @ 000002479ee1c180] Format h264 detected only with low score of 1, misdetection possible!

  Then this repeats several dozen times :

      Last message repeated 1 times
  
  [h264 @ 000002479ee1de40] decode_slice_header error
  
  [h264 @ 000002479ee1de40] no frame!
  
  [h264 @ 000002479ee1de40] non-existing PPS 0 referenced

  And it finishes off with this :

  [h264 @ 000002479ee1c180] Could not find codec parameters for stream 0 (Video: h264, none): unspecified size
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  Input #0, h264, from '.\recfile_-200102-130000-135959-00001100.264':
  
    Duration: N/A, bitrate: N/A
  
      Stream #0:0: Video: h264, none, 25 fps, 25 tbr, 1200k tbn, 50 tbc

  I have tried several options with ffmpeg, including force_key_frames, setting the analyzeduration and probesize options to max_int, tried a -c copy, forcibly specified x264, tried to force a specific resolution (which it should all be standard HD video), and several others that I can’t recall at the moment.

  The video files are also accompanied by a .IDX file, but I haven’t figured out how important they are if they are at all to the video file.

  I can provide links to the smallest video and its associated IDX if needed, but if anyone can think of anything else to try on these files I’d greatly appreciate it.

• FFmpeg os.system commands not working but work in Terminal

  28 janvier 2020, par Oscar Dolloway

  I’ve downloaded ffmpeg through the website and ran some commands through the terminal to confirm its install.

  when running the command ’ffmpeg’ in the Terminal it returns

   ffmpeg version 4.2.2 Copyright (c) 2000-2019 the FFmpeg 
  
   developers
  
   built with Apple LLVM version 10.0.0 (clang-1000.11.45.5)

  if i type into Python

  import os
  
  os.system ('ffmpeg')

  it returns

   os.system ('ffmpeg')
  
   sh: ffmpeg: command not found
  
   Out[25]: 32512

  any ideas ?

  Solution :

   ffmpeg = '/bin/ffmpeg' #path to the binary file
  
  
  
   os.system(ffmpeg)

  Output :

  os.system (ffmpeg)
  
  ffmpeg version 4.2.2 Copyright (c) 2000-2019 the FFmpeg developers
  
  built with Apple LLVM version 10.0.0 (clang-1000.11.45.5)

• Unable to use FFMPEG to transcode video

  30 janvier 2020, par Mathew Paret

  I am getting the below error while transcoding videos automatically using nzbtomedia (https://github.com/clinton-hall/nzbToMedia/).

  Transcoder returned:b"Unknown encoder ’libx264’\n" has failed

  How do I install this encoder ?

  Raspbain (Raspberry PI)

  Additional Info :

  FFMPEG Version

  ffmpeg version N-96192-g2ff687c17f Copyright (c) 2000-2019 the FFmpeg developers
  
  built with gcc 8 (Raspbian 8.3.0-6+rpi1)
  
  configuration: 
  
  libavutil      56. 38.100 / 56. 38.100
  
  libavcodec     58. 65.100 / 58. 65.100
  
  libavformat    58. 35.101 / 58. 35.101
  
  libavdevice    58.  9.101 / 58.  9.101
  
  libavfilter     7. 69.101 /  7. 69.101
  
  libswscale      5.  6.100 /  5.  6.100
  
  libswresample   3.  6.100 /  3.  6.100

  ffmpeg -encoders | grep 264

  ffmpeg version N-96192-g2ff687c17f Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc 8 (Raspbian 8.3.0-6+rpi1)
  
    configuration: 
  
    libavutil      56. 38.100 / 56. 38.100
  
    libavcodec     58. 65.100 / 58. 65.100
  
    libavformat    58. 35.101 / 58. 35.101
  
    libavdevice    58.  9.101 / 58.  9.101
  
    libavfilter     7. 69.101 /  7. 69.101
  
    libswscale      5.  6.100 /  5.  6.100
  
    libswresample   3.  6.100 /  3.  6.100
  
   V..... h264_v4l2m2m         V4L2 mem2mem H.264 encoder wrapper (codec h264)