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• Anomalie #3636 : cohérence de l’ergonomie de la fonction de changement de statut

  7 janvier 2016, par Maïeul Rouquette

  Effectivement. Mais comme c’est uniquement pour le premier l’utilisateur a le temps d’oublier cela ;-)

  En outre je continue de penser que cette manie spipienne de faire des boutons de validation qui n’apparaissent pas au premier regard est une mauvaise approche. Surtout lorsqu’on a un menu deroulant, ce qui peut laisser penser qu’il n’y a plus rien à faire.

  Donc suggestion :
  - ou bien afficher systématiquement le bouton de validation
  - ou bien lors du changement dans le menu déroulant, faire une popup (comme pour les puces de statut) demandant de valider, et enregistrer ensuite ce résultat (ou bien revenir à l’ancienne méthode qui consistait à avoir une liste de statut à cliquer…)

• Révision 17173 : articles_page en php est remplacee par mes_articles, qui dit bien ce qu’elle veu...

  12 février 2011, par cedric -

  et pas d’articles, pas d’acces a la page dans le menu !

• How to extract time-accurate video segments with ffmpeg ?

  25 mai 2016, par Jim Miller

  This is not a particularly new question area around here, but I’ve tried what’s been suggested there without much luck. So, my story :

  I’ve got a hunk of 15 seconds of straight-from-the-camera.mov video out of which I want to extract a specific chunk, which I can identify by start time and stop time, in seconds. I started by trying to do what I’ll call a "copy extraction" : to get seconds 9 to 12,

  ffmpeg -i test.mov -vcodec copy -acodec copy -ss 9 -to 12 test-copy.mov

  This was a not-bad start, but there are some black frames at the beginning and end of the clip, which I can’t have — it has to be a clean edit from the original. So, I tried recoding the original into a new, trimmed clip :

  ffmpeg -i test.mov -ss 00:00:09 -t 00:00:03 test-out.mov

  This is better, but not quite : There are no longer any black frames at the beginning of the clip, but they’re still there at the end.

  After some more browsing and reading, I then suspected that the problem is that ffmpeg is having trouble finding the proper points because of a lack of keyframes in the original video. So I recoded the original video to (presumably) add keyframes, in a couple of different ways. Since I want to be able to pick video at boundaries of a second ("from 9 seconds to 12 seconds"), I tried, copying various suggestions around the web,

  ffmpeg -i test.mov -force_key_frames "expr:gte(t, n_forced)" test-forced.mp4

  and

  ffmpeg -i test.mov -g 1 test-g-inserted.mp4

  (I built these as mp4’s based on some comments about an mp4 container being needed to support the keyframe search, but I’m honestly just hacking here.) I then tried the extraction as before, but on these new videos that presumably now have keyframes in them. No luck — both seem to be about the same ; the start is OK but there are still black frames at the end. (FWIW, both test-forced.mp4 and test-g-inserted.mp4 also have trailing black frames.)

  So : I’m still stuck, and would like to not be. Any insights out there as to what I’m doing wrong ? I feel like I’m close, but I really need to get rid of those trailing black frames....