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• FFMPEG trimming video (using select between) doesn't affect overall duration

  5 mai 2022, par srb7

  Completely new to working with FFMPEG, what I'm trying to achieve is applying overlaying graphics at certain positions and times, and cutting out sections of a single input video.

  


  I've worked out the overlaying graphics, so this code is working :

  


  ffmpeg -i /Users/username/projectdir/static/video.mp4 \
  -i overlay.png -i overlay2.png \
  -filter_complex "[0:v][1:v] overlay=192:108:enable='between(t, 0, 5)'[ov0]; 
                   [ov0] overlay=192:108:enable='between(t, 5, 10)'" \
  -pix_fmt yuv420p output_overlayed.mp4


  


  But when I try to cut out sections using this code :

  


  ffmpeg -i /Users/username/projectdir/static/video.mp4 \
  -i overlay.png -i overlay2.png \
  -filter_complex "[0:v][1:v] overlay=192:108:enable='between(t, 0, 5)'[ov0]; \
                   [ov0] overlay=192:108:enable='between(t, 5, 10)', \
                      select='between(t,0,5)+between(t,10,15)', \
                      setpts='N/FRAME_RATE/TB'" \
  -pix_fmt yuv420p output_overlayed_trimmed.mp4


  


  It seems to cut correctly, so the original video starts playing from 0 seconds until 5 seconds and then plays from 10 seconds in until 15 seconds and cuts out. But after the point where the video cuts out it's just a black screen for the duration of the video. I can't seem to get it to work so it affects the overall duration of the video.

  


  (The values being passed in are just examples by the way, eg. I've got it to start an overlay 5 seconds in but also cut 5 seconds in)

  


  I have the timestamps for when the overlays should appear on the non-trimmed video, so the overlaying should happen first and then the trimming. If the video is trimmed first then the overlays will appear at the wrong times.

  


  An alternative way of achieving this that is currently working is by performing the first line of code (which just produces a new video file with the overlay) and then separately take this new file and perform the trimming independently :

  


  ffmpeg -ss 0 -to 5 -i /Users/username/projectdir/static/output_overlayed.mp4 \
  -ss 15 -to 20 -i /Users/username/projectdir/static/output_overlayed.mp4 \
  -filter_complex "[0][1]concat=n=2:v=1:a=1" output_trimmed.mp4


  


  But this means working with 2 separate files and then having to remove the first after the 2nd execution is complete. Ideally I'd combine them into one command which doesn't produce multiple files.

  


  Would appreciate any help - thanks !

  


• openHEVC for audio decoding

  14 septembre 2017, par gsk

  I am using openHEVC decoder for one of my projects and am not really sure whether it supports decoding audio streams together with the video decoding. Initial testing with an AAC coded audio stream didn’t play inside the openHEVC. Can someone please help me to clarify this issue. If its not supporting what could be the way around given that I don’t want to give up openHEVC and use some other decoder.

  Thank you.

• Anomalie #3181 (Nouveau) : mots et groupes - API d’édition des objets

  7 mars 2014, par Sylvain Lesage

  Les fonctions d’action du plugin mots ne semblent pas suivre les mêmes règles que l’API d’édition des objets, ce qui en permet pas d’utiliser ces fonctions génériques pour les mots ou les groupes de mots (me semble-t-il). Est-il envisageable de les adapter au format défini par l’API ?

  Insertion¶

  API : objet_inserer

   bool | int objet_inserer( string $objet , int $id_parent = null , array | null $set = null ) 
  

  Mot : mot_inserer

   int | bool mot_inserer( int $id_groupe ) 
  

  Groupe de mots : groupemots_inserer

   int | bool groupemots_inserer( string $table = ’’ ) 
  

  Modification¶

  API : objet_modifier

   mixed | string objet_modifier( string $objet , int $id , array | null $set = null ) 
  

  Mot : mot_modifier

   string | null mot_modifier( int $id_mot , array | null $set = null ) 
  

  Groupe mots : groupemots_modifier

   string | null groupemots_modifier( int $id_groupe , array | null $set = null )