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• How to write command line argument input redirection within a bash script ?

  3 septembre 2013, par Serg ikS

  I'm putting together a bash script to run movie rendering jobs. ffmpeg expects a multi-line text file as one of the arguments for concatenation filter to join several files into one. Like this :

  ffmpeg -f concat -i mylist.txt -c copy output

  There's also an option to write it all in a single line like so :

  ffmpeg -f concat -i <(printf "file '%s'\n" A.mp4 B.mp4) -c copy Output.mp4

  How do I write the latter for into a bash script, substituting the file names from other variables ? Tryed splitting the variables, but its not the one that works. $A and $B variables contains paths to input files.

  #!/bin/bash
  
  ...
  
  TMP_LIST=$(printf "file '%s'\n" ${A} ${B})
  
  APPEND="${FFMPEG} -f concat -i <<< {${TMP_LIST}} -c copy ${OUTPUT}"
  
  # run the concatenation:
  
  $APPEND

• ffmpeg not finding audio streams ?

  24 septembre 2013, par Jim Miller

  I'm doing some video conversion with ffmpeg v. N-54271-g7f866c1 (a fresh pull from the git sources in late June 2013) on Fedora 19. One of the things I want to do is to concatenate two videos and then convert the result to an mp4. The following code is working well for me :

  ffmpeg -i video_a.mov -i video_b.mov -acodec libfaac -vcodec libx264 
  
       -preset fast -crf 22  -s 940x528 -pix_fmt yuv420p 
  
       -filter_complex '[0:1] [0:0] [1:1] [1:0]  concat=n=2:v=1:a=1 [v] [a]' 
  
       -map '[v]' -map '[a]' output.mp4

  except for a couple of older hunks of test video I've been using. On those, ffmpeg isn't finding the audio stream, and so the above call dies with ffmpeg complaining that Stream specifier ':1' in filtergraph description [0:1][0:0][1:1][1:0] concat=n=2:v=1:a=1 [v] [a] matches no streams. The catch, of course, is that there is an audio stream in the video ; it's just not getting found.

  When ffmpeg starts, I get a description of the input like so :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/var/www/priv/videorising7/raw_take_video/v2261-MTQxMzgwMDM4NzAx.mov':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 537199360
  
      compatible_brands: qt  
  
      creation_time   : 2011-10-13 16:08:18
  
    Duration: 00:00:25.52, start: 0.000000, bitrate: 49 kb/s
  
      Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 608x342, 47 kb/s, 10.03 fps, 10 tbr, 1k tbn, 2k tbc
  
      Metadata:
  
        creation_time   : 2011-10-13 16:08:18
  
        handler_name    : Apple Alias Data Handler

  I suppose the video might just be so old (2006 ?) that I should be lucky that it plays at all. However, I'm able to run these videos through some other ffmpeg jobs (converting from .mov to .mp4, for instance), but those don't require explicitly referencing the audio and video tracks. Any insights out there ?

• Anomalie #3745 (Nouveau) : pb paquetage ?

  9 mars 2016, par jluc -

  1) Sur http://plugins.spip.net/dev.html le plugin apparaît 2 fois avec la même version 0.4.4 - stable Compatible : SPIP 3.1

  2) Dans la page "ajouter un plugin" de SPIP 3.1, il n’apparaît pas si on cherche "dev" ou "developpement" ou "développement", avec les critères "toutes les catégorie", "tous les états", "tous les dépot" (le dépot par défaut spip zone http://plugins.spip.net/depots/principal.xml étant activé) et "toutes les versions compatibles".