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• Recursively scan and identify video files with FFMPEG

  2 mars 2021, par Jason Paul Michaels

  UPDATE

  


  Thank you everyone for sharing up your suggestions. I was able to make the work properly by modifying it as follows.

  


  #!/bin/bash

ROOTPATH="/Volumes/NVME-RAID/ASSET-Processing/CORRUPT-SCAN/SCAN " # manually define root  path to your folder that has subfolders
for subdir in *; do
  cd ${ROOTPATH}${subdir} 
  mkdir 00errors
  
  for path in *.{MOV,mov,MP4,mp4}; do

    ffmpeg -i "${path}" -f null -; echo$?
    RC=$?

    if [ "${RC}" -ne "0" ]; then
        # Do something to handle the error.
        mv ${path} ./00errors
    fi

  done
  cd ../
done


  


  The only issue i have now is that it does not appear to be traversing the subfolders. As I understand it it should create a "00errors" folder in within EACH sub folder and move the errors files within that sub folder.

  


  trying to sift through 14TB of recovered video...

  


  I'm trying to figure out how to properly convert this script so it will run on a bash/MacOS. I'm coming to a wall with the "ROOTPATH" call because MacOS doesn't use /mnt

  


  #!/bin/bash

ROOTPATH="/mnt/f/00test/" # manually define root  path to your folder that has subfolders
for subdir in *; do
  cd ${ROOTPATH}${subdir} 
  mkdir 00errors
  
  for path in *.mp4; do

    ffmpeg error -i "${path}"
    RC=$?

    if [ "${RC}" -ne "0" ]; then
        # Do something to handle the error.
        mv ${path} ./00errors
    fi

  done
  cd ../
done


  


  REF Quickly check the integrity of video files inside a directory with ffmpeg

  


• Does stream seek order matter for ffmpeg av_seek_frame() ?

  2 janvier 2019, par necrosato

  I am attempting to seek both audio and video streams for an mp4 using the ffmpeg av_seek_frame method.

  I have encountered an issue when seeking that I have remedied by changing my seek order, but would like to make sure my fix is actually a fix and not some coincidental hack that works.

  I am attempting to seek both the audio and video stream to the first packet. For video, the first packet has a pts of 0. For audio, the first packet has a pts of -1024. The video stream has an index of 0 and the audio stream has an index of 1. This has all been verified using ffprobe on the media file to view the packets and streams.

  The following code does not work, it seeks both the audio and video streams to packets with pts of 0 :

  for (int i = format_context->nb_streams - 1; i >= 0; --i) {
  
      AVStream* stream = format_context->streams[i];
  
      av_seek_frame(format_context, i, stream->first_dts, flags);
  
  }

  But this properly seeks the video stream to pts 0 and audio stream to pts -1024 :

  for (int i = 0; i < format_context->nb_streams; ++i) {
  
      AVStream* stream = format_context->streams[i];
  
      av_seek_frame(format_context, i, stream->first_dts, flags);
  
  }

  Note that in the first example, audio is seeked before video, and in the second example video is seeked before audio.

  Does the order of the av_seek_frame calls actually matter, or is there a bug somewhere else in my code that this just so happens to cover up ?

• parsing different ffmpeg -i output

  11 août 2012, par Jizbo Jonez

  I have a bit of code that gets a video files duration, width, height and framerate which works fine for some videos -

  $output = `ffmpeg -i /var/thismovie.avi`;
  
  preg_match('/Duration: (.*?),.*?Video:.*?0x.*?([0-9]+)x([[0-9]+).*?([0-9]+) fps/i'
  
  ,$output , $result);

  The problem is there are other videos that give a slightly different output information, for example the above code works with this output -

  Input #0, avi, from '/var/www/vhosts/thissite.com/httpdocs/video1.avi':
  
  Duration: 00:00:10.76, start: 0.000000, bitrate: 5180 kb/s
  
  Stream #0:0: Video: h264 (High) (H264 / 0x34363248), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 25 tbn, 50 tbc
  
  Stream #0:1: Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz, stereo, s16, 128 kb/s

  but another video gives this info and will not give any results when used with the above code -

  Input #0, avi, from '/var/www/vhosts/thissite.com/httpdocs/video2.avi':
  
  Duration: 00:00:05.68, start: 0.000000, bitrate: 887 kb/s
  
  Stream #0:0: Video: mpeg4 (Advanced Simple Profile) (XVID / 0x44495658), yuv420p, 640x272 [SAR 1:1 DAR 40:17], 25 tbr, 25 tbn, 25 tbc
  
  Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 48000 Hz, stereo, s16, 128 kb/s

  The difference between the two outputs is in the Stream #0:0 part. The fist output shows 7 different pieces of information separated by a comma, the last output only shows 6 bits. The missing piece of info in the last output is the frame rate (fps) but apparently I can use the value for tbr instead.

  So my question is, how can I modify the code I am using to cover both types of outputs ?