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Autres articles (78)
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Personnaliser en ajoutant son logo, sa bannière ou son image de fond
5 septembre 2013, parCertains thèmes prennent en compte trois éléments de personnalisation : l’ajout d’un logo ; l’ajout d’une bannière l’ajout d’une image de fond ;
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Ecrire une actualité
21 juin 2013, parPrésentez les changements dans votre MédiaSPIP ou les actualités de vos projets sur votre MédiaSPIP grâce à la rubrique actualités.
Dans le thème par défaut spipeo de MédiaSPIP, les actualités sont affichées en bas de la page principale sous les éditoriaux.
Vous pouvez personnaliser le formulaire de création d’une actualité.
Formulaire de création d’une actualité Dans le cas d’un document de type actualité, les champs proposés par défaut sont : Date de publication ( personnaliser la date de publication ) (...) -
Websites made with MediaSPIP
2 mai 2011, parThis page lists some websites based on MediaSPIP.
Sur d’autres sites (12392)
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FFMPEG Wipe transition one layer over another
25 juillet 2021, par Dan WeaverHow to reveal one layer over another with a wipe transition using FFMPEG ?




NOTE : this is not a slide transition. The top image stays in one position but is gradually revealed over time.


I'd like a technique that can work for top layers with or without transparency and for images, videos or dynamically created sources, like
showwavespic
.

I tried making a mask animation like so :




but
alphamerge
doesn't work as I expected it to and I can't find ablend
mode that works with this type of mask.

EDIT : The
xfade
filter was suggested but it doesn't seem to work with when source has transparency. It renders transparent areas black. Example with transparent source :



But
xfade
renders this :



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ffmpeg - prop flicker removal works but ffmpeg insists on changing framerate [closed]
28 avril 2023, par Mutley EugeniusI have been researching how to use FFmpeg to do some fantastic wizardry on my cockpit videos to remove the dramatically distracting propeller, but after many hours now I cannot seem to find a way to get the program to stop stripping more than half the frames. The source video file is 1920 x 1080 @ 60fps and I believe I have my offset right (1/60= 0.0166) but the output video is always coming out at 25 fps. Can't see what element in the code is telling it to do that, or how to change it.


Here's my file :


https://drive.google.com/file/d/1VPttH4PHgUr0uzmsbl4Bcyg5_gAixblA/view?usp=sharing


Here's my code :


ffmpeg -i G:\PropFlicker.mp4 -itsoffset 0.01666 -i G:\PropFlicker.mp4 -filter_complex color=0x202020:s=1920x1080:d=24[mask];[mask][0][1]maskedmax=[out] -map [out] -crf 10 G:\PropNoFlicker.mp4



I have tried adding
-r 60
which gives me a 60 fps output file, but the video is still being processed at 25 and it just adds in duplicated frames after processing to pad it out to 60. The rendering shows more dropped frames than rendered frames by about a 3 to 2 ratio which matches frame drops from 60 to 25. I lose my shot fluidity and I get flickery artifacts

What am I missing to get the flicker removal processing done at 60 fps and the output file rendered at 60 fps with the original smoothness ?


I'm also not sure what the :d=24 is doing. I tried d=60, but it made no difference.


I copied original code that I found in this link :




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Merge commit ’04763c6f87690b31cfcd0d324cf36a451531dcd0’
18 mars 2017, par Clément BœschMerge commit ’04763c6f87690b31cfcd0d324cf36a451531dcd0’
* commit ’04763c6f87690b31cfcd0d324cf36a451531dcd0’ :
h264_direct : use the reference mask from the actual referenceThis commit is a noop, see d8151a7e944aea52d167571badc247c8d9972847
Merged-by : Clément Bœsch <u@pkh.me>