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• FFMPEG segment stream into MP4 chunks of 4 seconds [AV out of sync]

  18 décembre 2015, par Kr0e

  I want to segment an incoming RTMP stream into MP4 chunks of 4 seconds.
  These MP4 chunks contain both, audio and video tracks.

  Unfortunately, the duration of the audio and video track are not equal, which leads to AV out-of-sync when playing both tracks at the same time in HTML 5 MSE source buffers.

  mp4info outputs :

  Track 1:
  
    flags:        3 ENABLED IN-MOVIE
  
    id:           1
  
    type:         Video
  
    duration: 4000 ms
  
  
  
  Track 2:
  
    flags:        3 ENABLED IN-MOVIE
  
    id:           2
  
    type:         Audio
  
    duration: 3994 ms

  So, obviously, the audio system does not care about video keyframes.

  How can I fix this ?

  Btw. :

  This is my only issue, MP4 fragmentation is solved using mp4box.js.

  AV out-of-sync is my end boss =]

  Command :

  let camera2TS = spawn('./ffmpeg/darwin/ffmpeg', [
  
        '-rtmp_listen', '1', '-i', 'rtmp://127.0.0.1:1935/foxnet/live',
  
        '-c:v', 'libx264', '-x264-params', 'keyint=240:no-scenecut=1', '-pix_fmt', 'yuv420p',
  
        '-force_key_frames', 'expr:gte(t,n_forced*4)', '-frag_duration', '4',
  
        '-preset', 'ultrafast', '-profile:v', 'baseline', '-level:v', '3', '-r', '25', '-g', '100',
  
        '-strict', 'experimental', '-b:v', '3500k', '-bufsize', '3500k',
  
        '-c:a', 'aac', '-af', 'aresample=async=1',
  
        '-f', 'segment', '-segment_time', '4', '-reset_timestamps', '1',
  
        'chunks/%01d.mp4'
  
      ]);

• How do I cut the last 10 seconds from mpeg using ffmpeg (and applescript etc) [closed]

  10 décembre 2015, par EvGeniy Ilyin

  I have many different mpeg files. In every mpeg file are credits at the end of the video. I need to cut it. How I can do it for bath(list) ?
  for example :

  ffmpeg -i my.mp4 -vcodec copy -acodec copy -ss 00:10:10 my_cute.mp4

  but every mpeg file has different duration...
  Is there a way to specify the indent from the end ?

  my answer
  using applescript organizing logic
  main parameters : the length of the titles and file folder

  1. to draw up a list of specified path mp4 files
  2. cycles through each file
     1. using ffprobe obtain data in xml with a total length video
     2. parse xml, we obtain the duration of the
     3. using ffmpeg, knowing the total duration of the video and the length of the credits at the end - set the new duration

  -- settings
  
  set titresDuration to 54.0
  
  set folderPath to "/Users/-/Downloads/-.XviD.SATRip.Thunder"
  
  
  
  set filesList to my filesInFolder(folderPath, true, ".mp4")
  
  repeat with fileName in filesList
  
      set videoDuration to my videoDurationOfFile(fileName)
  
      set fileCutName to do shell script "echo '" & fileName & "' | sed 's/\\.mp4/c\\.mp4/g'"
  
      if videoDuration > titresDuration then
  
          set videoDurationWithoutTitres to videoDuration - titresDuration
  
          set videoDurationWithoutTitres to my numberToString(videoDurationWithoutTitres)
  
          set ffmpegScript to "/usr/local/bin/ffmpeg -y -i " & quoted form of fileName & " -t " & videoDurationWithoutTitres & " -c copy " & quoted form of fileCutName
  
          set info to do shell script ffmpegScript
  
      end if
  
  end repeat
  
  log "the end"
  
  
  
  
  
  
  
  -- helpers methods
  
  on videoDurationOfFile(fileName)
  
      set probeScript to "/usr/local/bin/ffprobe -v quiet -print_format xml -show_format " & quoted form of fileName
  
      set videoTags to do shell script probeScript --"/usr/local/bin/ffprobe -v quiet -print_format xml -show_format " & fileName
  
      set videoDuration to 0.0
  
      tell application "System Events"
  
          set xmlData to make new XML data with properties {name:"xmldata", text:videoTags}
  
          set xmlFFprobe to XML element "ffprobe" of xmlData
  
          set xmlFormat to XML element "format" of xmlFFprobe
  
          set attrs to value of XML attribute "duration" of xmlFormat
  
          set attrs to do shell script "echo '" & attrs & "' | sed 's/[0]*$//g'"
  
          set attrs to do shell script "echo '" & attrs & "' | sed 's/\\./,/g'"
  
          set videoDuration to attrs as real
  
      end tell
  
      return videoDuration
  
  end videoDurationOfFile
  
  
  
  on numberToString(this_number)
  
      set this_number to this_number as string
  
      set this_number to do shell script "echo '" & this_number & "' | sed 's/,/\\./g'"
  
      if this_number contains "E+" then
  
          set x to the offset of "." in this_number
  
          set y to the offset of "+" in this_number
  
          set z to the offset of "E" in this_number
  
          set the decimal_adjust to characters (y - (length of this_number)) thru ¬
  
              -1 of this_number as string as number
  
          if x is not 0 then
  
              set the first_part to characters 1 thru (x - 1) of this_number as string
  
          else
  
              set the first_part to ""
  
          end if
  
          set the second_part to characters (x + 1) thru (z - 1) of this_number as string
  
          set the converted_number to the first_part
  
          repeat with i from 1 to the decimal_adjust
  
              try
  
                  set the converted_number to ¬
  
                      the converted_number & character i of the second_part
  
              on error
  
                  set the converted_number to the converted_number & "0"
  
              end try
  
          end repeat
  
          return the converted_number
  
      else
  
          return this_number
  
      end if
  
  end numberToString
  
  
  
  on filesInFolder(folderPath, lookInSubfolders, filter)
  
      set filesList to {}
  
      tell application "System Events" to set filesList to POSIX path of (files of folder folderPath whose name contains filter)
  
      if lookInSubfolders then
  
          tell application "System Events" to set subfoldersList to POSIX path of (folders of folder folderPath)
  
          repeat with subfolderPath in subfoldersList
  
              set subfilesList to my filesInFolder(subfolderPath, true, filter)
  
              repeat with subfile in subfilesList
  
                  set end of filesList to subfile
  
              end repeat
  
          end repeat
  
      end if
  
      return filesList
  
  end filesInFolder

• FFMPEG to trim off last 3 seconds of videos

  27 janvier 2023, par humble5050

  I am trying to trim/cut off the last 3 secs of my videos with FFMPEG but this has really been an headache.

  



  The following code trims but only retains the last 3 seconds.
I don't want to retain the 3 secs, i don't need that, i want to retain the deleted part.

  



  ffmpeg -sseof -3 -i input.mp4 output.mp4

  



  Can someone please help me with the right code ?.
I will also like to request a batch code that will auto trim all last 3 secs of videos in my folder.
Thanks for the help.