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Autres articles (61)
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Soumettre améliorations et plugins supplémentaires
10 avril 2011Si vous avez développé une nouvelle extension permettant d’ajouter une ou plusieurs fonctionnalités utiles à MediaSPIP, faites le nous savoir et son intégration dans la distribution officielle sera envisagée.
Vous pouvez utiliser la liste de discussion de développement afin de le faire savoir ou demander de l’aide quant à la réalisation de ce plugin. MediaSPIP étant basé sur SPIP, il est également possible d’utiliser le liste de discussion SPIP-zone de SPIP pour (...) -
Contribute to translation
13 avril 2011You can help us to improve the language used in the software interface to make MediaSPIP more accessible and user-friendly. You can also translate the interface into any language that allows it to spread to new linguistic communities.
To do this, we use the translation interface of SPIP where the all the language modules of MediaSPIP are available. Just subscribe to the mailing list and request further informantion on translation.
MediaSPIP is currently available in French and English (...) -
Contribute to documentation
13 avril 2011Documentation is vital to the development of improved technical capabilities.
MediaSPIP welcomes documentation by users as well as developers - including : critique of existing features and functions articles contributed by developers, administrators, content producers and editors screenshots to illustrate the above translations of existing documentation into other languages
To contribute, register to the project users’ mailing (...)
Sur d’autres sites (9167)
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FFMPEG - CONVERT VIDEO TO GREYSCALE EXCEPT ONE COLOR ? LEAVE ONE COLOR, THE REST BLACK & WHITE ? [closed]
19 décembre 2023, par scm360I have been researching and cannot find anything on how to preserve just one color / color range ; while converting a video to greyscale / black & white using FFMPEG. For example ; all black and white, except the peoples Blue Jeans, etc.


Anyone know how to do this in FFMPEG ?


Thanks in advance.


I haven't actually found anything that has promise to achieve this. Of course I know how to convert everything to greyscale / black & white. But, not just leave the color / color range.


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avcodec/tiff : Fix default white level
16 juillet 2020, par Michael Niedermayeravcodec/tiff : Fix default white level
According to the spec bits per sample should be used
Fix invalid shift with bpp=32
Fixes : shift exponent 32 is too large for 32-bit type 'unsigned int'
Fixes : 23507/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TIFF_fuzzer-4815432665268224Found-by : continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by : Michael Niedermayer <michael@niedermayer.cc> -
Filter useless white frames at the beginning and duplicated frames at the end of captured video
21 septembre 2020, par gumkinsI'm capturing HTML animation with use of Puppeteer and MediaRecorder API.


Before starting the capturing I'm waiting for
networkidleevent (I tried networkidle0-2 but result is identical)

await page.goto(url, { waitUntil: 'networkidle0' })


For some reason, the animation starts to play 2-3 seconds after the capturing starts, and thus, white frames are captures.
Similar, at the end of the video there are identical frames because capturing duration is a bit longer than animation plays.


Thus I want to detect and cut off those repeating white frames at the beginning and repeating non-white frames at the end of the video (mp4/webm).


I tried some solutions, like described here, for instance


ffmpeg -i input.mp4 -vf mpdecimate,setpts=N/FRAME_RATE/TB out.mp4


It does remove duplicates, but the problem is that it cuts off dups in the middle as well.


Thus, if I have a 15 sec animation,it removes all dups at the beginning, all dups at the end and all dups in the middle, and what is left after it is just a several identical frames which are pack into less than 1 sec video.


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