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• ffmpeg failed to drawbox and set volume

  27 janvier 2021, par Hussam Al-Barodi

  I don't know what is wrong in my command with ffmpeg.
Lets say I have a video and I want to make a black screen with muted audio between 20-30 seconds. So what I wrote is :

  


  ffmpeg -i input.mp4 -filter_complex "[0:v]trim=0:20[0v];[0:a]atrim=0:20[0a];[0:v]trim=20:30,drawbox=color=black:t=fill[1v];[0:a]atrim=20:30,volume=0[1a];[0:v]trim=30:60[2v];[0:a]atrim=30:60[2a];[0v][1v][2v]concat=n=3:v=1:a=0[outv];[0a][1a][2a]concat=n=3:v=0:a=1[outa]" -map [outv] -map [outa] output.mp4


  


  Now, I expect to have a video with 1 min length where the seconds between 20 & 30 are muted with black screen, but what I got is :

  


  20 sec correct
20 sec freezing video with no audio
40 sec black video with no audio
30 sec correct


  


  Can anyone help and tell me what is wrong in the command line ?

  


• FFMPEG - modify only part of video with select filter

  28 janvier 2023, par Compact

  I have a video file - an NTSC DVD rip. I want to convert it into PAL DVD. The problem with that NTSC DVD is that it's a mixture of telecined content, true progressive 29.97 content, true interlaced content at 29.97 fps. The problem is with the true interlaced content - it's sometimes encoded as top field first and sometimes as bottom field first...

  


  To keep quality as much as possible, I would like remove telecined frames, but keep those interlaced sequences and turn them to 25 fps top field first. This is where the problem arises.

  


  I tried to make filter_complex chain with two select filters, where I reverse the fields for bottom field first frames, but the video is not encoding at all when I do that.

  


  Here is an example filter chain I tried to make - I've made a lot of iterations of something similar, using select or metadata select to no avail. I guess I don't understand how select and metadata select filters work. And I don't know how to do what I want.

  


  ffmpeg -i "input" -flags +ildct+ilme \
-filter_complex\
[0:v]idet,setparams=color_primaries=smpte170m:color_trc=bt709:colorspace=smpte170m \
,metadata=select:key=lavfi.idet.single.current_frame:value=bff:function=same_str,phase=b[bot];\[bot]metadata=select:key=lavfi.idet.single.current_frame:value=tff:function=same_str\
,fieldmatch=mode=pcn_ub:combmatch=full,decimate[tff];\
[tff]metadata=select:key=lavfi.idet.single.current_frame:value=progressive:function=same_str\
,fps=24000/1001[v1];[v1]select,setfield=tff[v]"


  


  If all of the interlaced content was top field first, I could simply do something similar to this :

  


  ffmpeg -i "input" -flags +ildct+ilme \
-filter:v "dejudder,fps=30000/1001,fieldmatch=mode=pcn_ub:combmatch=full,\
decimate,settb=1/25000,setpts=N/(25*TB),setfield=tff,setparams=field_mode=tff"


  


  Is that possible with ffmpeg ? To just modify a part of video and then modify it whole, including with the previous modification ?

  


• Champs inclus deux fois dans la liste, dans diogene

  2 janvier 2014

  Les formulaires d’édition des diogenes contiennent une option de configuration, avec un multiselect, pour choisir les champs à cacher dans le diogène. Par exemple, pour les rubriques, on propose "Descriptif" et "Texte".
  Mais dans le fichier http://zone.spip.org/trac/spip-zone/browser/_plugins_/diogene/diogene/trunk/saisies/champs_objets.html, on voit que les mêms champs sont inclus deux fois :

  • ligne 4
  • lignes 5 à 8.

  J’imagine qu’il faudrait choisir l’un ou l’autre, ou mélanger les deux.

  À noter aussi que la ligne 4 inclut les champs avec un nom traduit, alors que les lignes 5 à 8 incluent les noms des colonnes (texte, descriptif, extra) sans les traduire.