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• ffmpeg : overlay video on top of a cropped video, map the overlay audio, cut the base video to the overlays length

  14 mars 2023, par roku

  I'm trying to overlay a video on top of a base video which is cropped to a shorts video format (standing phone). The overlayed video should be centered on top of the base layer. The base video's length should be reduced to the overlay's length. And I want to save only the overlay's audio.

  


  I've tried a bunch of stuff without much success. The current state of my ffmpeg command is this :

  


  ffmpeg -i overlay.mp4 -ss 00:00:00 -to <insert base="base"> -i base.mp4 -map 1:v:0 -map 1:a -vf "crop=ih*(9/16):ih" -crf 21 output.mp4&#xA;</insert>

  


  But this only gives me the cropped version of the base video. So my questions are :

  


  

  1. How can I figure out the base video's length ?

  


  2. How can I actually overlay (not map) other video on top of the base video ?

  


  3. How can I map the overlay's audio ? Since -map 1:a the base's audio and -map 0:a says : "Stream map '0:a' matches no streams. To ignore this, add a trailing ' ?' to the map."

  


  


  Any help is appreciated.

  


• How to extract video clip from larger video based on specific time and duration

  26 juillet 2022, par user19019404

  I have video clips that get created. Each video is recorded for 5 minutes and starts at a time e.g. 10:01:20 to 10:06:19 then the next video from 10:06:20 etc. These videos are recorded at a specific frame rate, be it 5 frames or 30 frames (its dependent on the platform making the recording). The net result is NOT a 5 minute video clip but might be a 2 minute video clip (where everyone moves very quickly in the view as a result of the frame rates). I cannot restrict a 1 to 1 recording as these are generated by external systems.

  


  I need to extract specific portions out of the video. For example I need to extract from 10:03:10 to 10:03:35 (25 seconds). This would equate to 10 seconds into the video up to 14 seconds into the video, in those 4 seconds of video, 25 real world seconds are displayed.

  


  My question is do you have any guidance as to how I can calculate that each second of recording actually means 10 or 12 seconds in real life, therefore go to this frame and record to this frame for example.

  


  I have been looking at cv2.CAP_PROP_FPS to get the video frame rates, CAP_PROP_POS_MSEC and CAP_PROP_FRAME_COUNT and believe the answer might lie there, but not sure.

  


  The thinking being if I work out the frame rate of the video, the total frames then I can divide the one by the other to get to how many frames make up real world seconds (this is where I fail). This way I can run from frame to frame as a result.

  


  Thank you

  


• Anomalie #2307 : md5_boutons_plugins()

  21 juillet 2014, par marcimat ☺☮☯♫

  Et les traces pour voir plus clairement les 2 créations du même define (_UPDATED_boutons_plugins) :

  Premier passage (constante non définie)¶

  array (size=5)
    0 => 
      array (size=4)
        ’file’ => string ’[...]spip/ecrire/inc/plugin.php’ (length=57)
        ’line’ => int 636
        ’function’ => string ’plugin_ongletbouton’ (length=19)
    1 => 
      array (size=4)
        ’file’ => string ’[...]spip/ecrire/inc/plugin.php’ (length=57)
        ’line’ => int 530
        ’function’ => string ’plugins_precompile_xxxtions’ (length=27)
    2 => 
      array (size=4)
        ’file’ => string ’[...]spip/ecrire/inc/plugin.php’ (length=57)
        ’line’ => int 431
        ’function’ => string ’ecrire_plugin_actifs’ (length=20)
    3 => 
      array (size=4)
        ’file’ => string ’[...]spip/ecrire/inc_version.php’ (length=58)
        ’line’ => int 391
        ’function’ => string ’actualise_plugins_actifs’ (length=24)
    4 => 
      array (size=4)
        ’file’ => string ’[...]spip/ecrire/index.php’ (length=52)
        ’line’ => int 21
        ’function’ => string ’include’ (length=7)
  

  Second passage (constante déjà définie)¶

  array (size=5)
    0 => 
      array (size=4)
        ’file’ => string ’[...]spip/ecrire/inc/plugin.php’ (length=57)
        ’line’ => int 636
        ’function’ => string ’plugin_ongletbouton’ (length=19)
    1 => 
      array (size=4)
        ’file’ => string ’[...]spip/ecrire/inc/plugin.php’ (length=57)
        ’line’ => int 530
        ’function’ => string ’plugins_precompile_xxxtions’ (length=27)
    2 => 
      array (size=4)
        ’file’ => string ’[...]spip/ecrire/inc/plugin.php’ (length=57)
        ’line’ => int 431
        ’function’ => string ’ecrire_plugin_actifs’ (length=20)
    3 => 
      array (size=4)
        ’file’ => string ’[...]spip/plugins-dist/svp/exec/admin_plugin.php’ (length=74)
        ’line’ => int 52
        ’function’ => string ’actualise_plugins_actifs’ (length=24)
    4 => 
      array (size=4)
        ’file’ => string ’[...]spip/ecrire/index.php’ (length=52)
        ’line’ => int 151
        ’function’ => string ’exec_admin_plugin_dist’ (length=22)