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• How to recover corrupted MTS/AVCHD file ?

  5 février 2018, par Dmitry

  Several MTS files were copied from flashcard to PC. All files larger then 500 were damaged and can not be open using VLC or ffmpeg. For example 00011.MTS :

  $ ffmpeg -i 00011.MTS
  
  ffmpeg version 3.4.1 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with Apple LLVM version 9.0.0 (clang-900.0.39.2)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/3.4.1 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-gpl --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --enable-videotoolbox --disable-lzma
  
  libavutil      55. 78.100 / 55. 78.100
  
  libavcodec     57.107.100 / 57.107.100
  
  libavformat    57. 83.100 / 57. 83.100
  
  libavdevice    57. 10.100 / 57. 10.100
  
  libavfilter     6.107.100 /  6.107.100
  
  libavresample   3.  7.  0 /  3.  7.  0
  
  libswscale      4.  8.100 /  4.  8.100
  
  libswresample   2.  9.100 /  2.  9.100
  
  libpostproc    54.  7.100 / 54.  7.100
  
  00011.MTS: Invalid data found when processing input

  Smaller files works fine and can be opened using VLC or ffmpeg :

  $ ffmpeg -i 00012.MTS
  
  ffmpeg version 3.4.1 Copyright (c) 2000-2017 the FFmpeg developers
  
  built with Apple LLVM version 9.0.0 (clang-900.0.39.2)
  
  configuration: --prefix=/usr/local/Cellar/ffmpeg/3.4.1 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-gpl --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --enable-videotoolbox --disable-lzma
  
  libavutil      55. 78.100 / 55. 78.100
  
  libavcodec     57.107.100 / 57.107.100
  
  libavformat    57. 83.100 / 57. 83.100
  
  libavdevice    57. 10.100 / 57. 10.100
  
  libavfilter     6.107.100 /  6.107.100
  
  libavresample   3.  7.  0 /  3.  7.  0
  
  libswscale      4.  8.100 /  4.  8.100
  
  libswresample   2.  9.100 /  2.  9.100
  
  libpostproc    54.  7.100 / 54.  7.100
  
  Input #0, mpegts, from '00012.MTS':
  
  Duration: 00:00:30.16, start: 1.040000, bitrate: 23790 kb/s
  
  Program 1
  
      Stream #0:0[0x1011]: Video: h264 (High) (HDMV / 0x564D4448), yuv420p(top first), 1920x1080 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 90k tbn, 50 tbc
  
      Stream #0:1[0x1100]: Audio: pcm_bluray (HDMV / 0x564D4448), 48000 Hz, stereo, s16, 1536 kb/s
  
      Stream #0:2[0x1200]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] / 0x0090), 1920x1080
  
  At least one output file must be specified

  The size of the corrupted file looks ok (617594880). However if I compare corrupted 00011.MTS with good 00012.MTS using binary diff I see that the header differs too much :
  vbindiff 00011.MTS 00012.MTS

  There are not so much difference between good 00012.MTS and another good file 00013.MTS :
  vbindiff 00013.MTS 00012.MTS

  Questions :

  How to check which data is inside corrupted 00011.MTS and can audio or video data be recovered ?

  Are there any tools around that can recover video or audio steams (or parts of them) ?

• m3u8 split into audio and video frames stream simultaneously

  25 janvier 2018, par Turan Mammadov

  I am trying to capture live m3u8 stream in python and split it into two streams : rawaudio and rawvideo. Then to analyze them separately.

  It is possible to get both streams separately by using ffmpeg

  for audio

  import subprocess
  
  videolink = 'http://20.7.7.1:8080/live/xyz.m3u8'
  
  command = ['ffmpeg','-v','0', '-i', videolink, '-acodec', 'pcm_s16le', '-ac', '2', '-ar', '48000', '-f', 's16le', '-']
  
  proc = subprocess.Popen(command, stdout=subprocess.PIPE, bufsize=10**8)
  
  while True:
  
      raw_audio = proc.stdout.read(192000) #reads 1s audio

  for video

  import subprocess
  
  videolink = 'http://20.7.7.1:8080/live/xyz.m3u8'
  
  command = ['ffmpeg','-v','0', '-i', videolink,'-f', 'image2pipe',
  
         '-pix_fmt', 'bgr24','-vcodec', 'rawvideo', '-']
  
  proc = subprocess.Popen(command, stdout=subprocess.PIPE, bufsize=10**8)
  
  while True:
  
      raw_video = proc.stdout.read(432*240*3) #reads 1 frame

  In this case if I compare obtained results from these streams I can get time differences.
  My question is : Is it possible to capture both streams simultaneously using one command ?

• Sync two audio files

  3 février 2021, par kostya572

  I have 2 audio files :

  



  

  • correct.wav (duration 3:07)

  


  • incorrect.wav (duration 3:10)

  


  



  

  



  They are almost the same, but was generated with different sound fonts.

  



  The problem : The second file is late for a few seconds.

  



  How can I sync second file with the first one ? Maybe there some bash software that could detect first loud sounds appearance in the first sound and compare correct.wav with incorrect.wav, shorten the end of the incorrect.wav file.

  



  I know I can do it manually, but I need automated soulution for a lot of files.

  



  Here is approximate solutions I found :

  



  1) for detecting sound syncing to use this Python script - https://github.com/jeorgen/align-videos-by-sound but it's not perfect, not detecting 100%.

  



  2) use sox for cutting/trimming/comparing/detecting sound durations (code extraction) :

  



  length1ok=$(sox correct.wav -n stat 2>&1 | sed -n 's#^Length (seconds):[^0-9]*\([0-9.]*\)$#\1#p')
length2ok=$(sox incorrect.wav -n stat 2>&1 | sed -n 's#^Length (seconds):[^0-9]*\([0-9.]*\)$#\1#p')
if [[ $length1ok == $length2ok ]]; then
    echo "Everything OK: $length1ok = $length2ok"
else
    echo "Fatal error: Not the same final files"
fi

diff=$(echo "$length2 - $length1" | bc -l)
echo "difference = $diff"
echo "webm $length1 not greater than fluid2 $length2"
sox correct.wav incorrect.wav pad 0 $diff


  



  Comment to UltrasoundJelly's answer :
Here what result I get for your code :

  



  

  



  Here what result I need :