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• ffmpeg concat + invalid data found when processing + check for valid avi file

  11 juillet 2015, par user3585723

  I’m using ffmpeg to concatenate (merge) multiple avi files to a single avi file.
  I’m using the following command.

  ffmpeg -f concat -i mylist.txt -c copy out.avi

  The list of files to merge is given in mylist.txt

  Ex 'mylist.txt':
  
   file 'v01.avi'
  
   file 'v02.avi'
  
   file 'v03.avi'
  
  ...
  
   file 'vxx.avi'

  However, there is a problem when one of the file is corrupted (or empty).
  In this case, the video only contains the files up to the corrupted file.

  In this case, ffmpeg return the following errors :

  [concat @ 02b2ac80] Impossible to open 'v24.avi'
  
  mylist.txt: Invalid data found when processing input

  Q1) Is there a way to tell ffmpeg to continue merging even if it encounters an invalid file ?

  Alternatively, I decided to write a batch file that check if my avi files are valid before doing the merging.
  My second problem is that this operation takes more time that doing the merging itself.

  Q2) Is there a fast way to check if multiple avi files are valid with ffmpeg ? (and delete, ignore or rename them if they are not valid).

  Thanks in advance for your comments.

  ssinfod.

  For information, here is my current DOS batch file. (This batch is working but very slow because of the ffprobe to check if my avi are valids)

  GO.bat

  @ECHO OFF
  
  echo.
  
  echo == MERGING STARTED ==
  
  echo.
  
  set f=C:\myfolder
  
  set outfile=output.avi
  
  set listfile=mylist.txt
  
  set count=1
  
  
  
  if exist %listfile% call :deletelistfile
  
  if exist %outfile% call :deleteoutfile
  
  
  
  echo == Checking if avi is valid (with ffprobe) ==
  
  for %%f in (*.avi) DO (
  
      call ffprobe -v error %%f
  
      if errorlevel 1 (
  
          echo "ERROR:Corrupted file"
  
          move %%f %%f.bad
  
          del %%f
  
      )
  
  )
  
  
  
  echo == List avi files to convert in listfile ==
  
  for %%f in (*.avi) DO (
  
      echo file '%%f' >> %listfile%
  
      set /a count+=1
  
  )
  
  ffmpeg -v error -f concat -i mylist.txt -c copy %outfile%
  
  echo.
  
  echo == MERGING COMPLETED ==
  
  echo.
  
  GOTO :EOF
  
  
  
  :deletelistfile
  
   echo "Deleting mylist.txt"
  
   del %listfile%
  
  GOTO :EOF
  
  
  
  :deleteoutfile
  
   echo "Deleting output.avi"
  
   del %outfile%
  
  GOTO :EOF
  
  
  
  :EOF

• Reduce video processing time using FFMpeg ?

  17 février 2020, par Ali Raza

  Users of my app upload videos to my server and I process them to create different qualities, thumbnails and gifs etc. Which are then useful for mobile and web apps. It takes almost 15-20 minutes for each video to be processed. I am using ffmpeg. How can I reduce my processing time ?

• Keep FFMPEG processing if input fails

  17 janvier 2020, par Javier Urrestarazu

  I’m trying to save a stream to a video file. If the input stream goes down, FFMPEG automatically stops encoding, but I want to somehow still display those seconds in which the input is down (as a black frame or freezing the last frame).

  What I have tried :

  ffmpeg -i udp://x.x.x.x:y -c:v copy output.mp4

  I wonder if it is possible to keep writing the mp4 file even if the input goes down.