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La conservation du net art au musée. Les stratégies à l’œuvre
26 mai 2011
Mis à jour : Juillet 2013
Langue : français
Type : Texte
Autres articles (106)
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Les autorisations surchargées par les plugins
27 avril 2010, parMediaspip core
autoriser_auteur_modifier() afin que les visiteurs soient capables de modifier leurs informations sur la page d’auteurs -
Ajouter notes et légendes aux images
7 février 2011, parPour pouvoir ajouter notes et légendes aux images, la première étape est d’installer le plugin "Légendes".
Une fois le plugin activé, vous pouvez le configurer dans l’espace de configuration afin de modifier les droits de création / modification et de suppression des notes. Par défaut seuls les administrateurs du site peuvent ajouter des notes aux images.
Modification lors de l’ajout d’un média
Lors de l’ajout d’un média de type "image" un nouveau bouton apparait au dessus de la prévisualisation (...) -
Taille des images et des logos définissables
9 février 2011, parDans beaucoup d’endroits du site, logos et images sont redimensionnées pour correspondre aux emplacements définis par les thèmes. L’ensemble des ces tailles pouvant changer d’un thème à un autre peuvent être définies directement dans le thème et éviter ainsi à l’utilisateur de devoir les configurer manuellement après avoir changé l’apparence de son site.
Ces tailles d’images sont également disponibles dans la configuration spécifique de MediaSPIP Core. La taille maximale du logo du site en pixels, on permet (...)
Sur d’autres sites (9298)
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FFMPEG : alphaextract+split create transparent video in 1080 x 1920 pixels not working
30 juin 2021, par Karim ElhalloumiCreate your transparent video :
i found a solution to a problem of creating alpha from a video then put it next to original as an output it give one video with original+alpha
using this ffmpeg cmd :


ffmpeg -i video_name.video_extension -vf "split [a], pad=iw*2:ih [b], [a] alphaextract, [b] overlay=w" -y final_name_alpha.mp4



source :https://docs.minsar.app/create/howtos/transparentvideos/
the problem is This operation with Ffmpeg will not work if your video is not in 16:9 format, or has no alpha background.


Result :
CMD Result 
iwant put as input a template for phone size with black background and generate the 2 video in one


what Iam trying to get is video.mp4 :
Process here


I'm new to ffmpeg, is there any cmd to generate alpha next to original without having only black back ground and with 9:16 instead ?



ffmpeg version 4.4-essentials_build-www.gyan.dev Copyright (c) 2000-2021 the FFmpeg developers
 built with gcc 10.2.0 (Rev6, Built by MSYS2 project)
 configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-sdl2 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libgme --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libtheora --enable-libvo-amrwbenc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-librubberband
 libavutil 56. 70.100 / 56. 70.100
 libavcodec 58.134.100 / 58.134.100
 libavformat 58. 76.100 / 58. 76.100
 libavdevice 58. 13.100 / 58. 13.100
 libavfilter 7.110.100 / 7.110.100
 libswscale 5. 9.100 / 5. 9.100
 libswresample 3. 9.100 / 3. 9.100
 libpostproc 55. 9.100 / 55. 9.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'output.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf57.83.100
 Duration: 00:00:14.02, start: 0.000000, bitrate: 797 kb/s
 Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc), 540x960, 662 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
 Metadata:
 handler_name : VideoHandler
 vendor_id : [0][0][0][0]
 Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
 Metadata:
 handler_name : SoundHandler
 vendor_id : [0][0][0][0]
Stream mapping:
 Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
 Stream #0:1 -> #0:1 (aac (native) -> aac (native))
Press [q] to stop, [?] for help
[Parsed_alphaextract_2 @ 000001a9dae4bdc0] Requested planes not available.
[Parsed_alphaextract_2 @ 000001a9dae4bdc0] Failed to configure input pad on Parsed_alphaextract_2
Error reinitializing filters!
Failed to inject frame into filter network: Invalid argument
Error while processing the decoded data for stream #0:0
[aac @ 000001a9dadd4280] Qavg: 6441.061
[aac @ 000001a9dadd4280] 2 frames left in the queue on closing
Conversion failed!



cmd I'm using to merge video :


- filter_complexe "[2]split=2[color][alpha];[color]crop=iw/2:ih:0:0[color];[alpha]crop=iw/2:ih:iw/2:0[alpha];[color][alpha]alphamerge[ovrly];[0]scale=460:505,setsar=1[0_scaled];[1]scale=460:505,setsar=1[1_scaled];[3][0_scaled]overlay=x=80:y=175[base_img_1];[3][1_scaled]overlay=x=80:y=175[base_img_2];[base_img_1]zoompan=z='if(lte(zoom,1.0),1.2,max(1.001,zoom-0.0006))':d=25*14:s=540x960,fade=out:st=6:d=1:alpha=1,fade=t=in:st=0:d=1[video1];[base_img_2]zoompan=z='if(lte(on,25*6),1,if(lte(zoom,-1.0),1.2,min(zoom+0.0006,1.2)))':d=25*14:s=540x960[video2];[video2][video1]overlay[overlay_video1];[overlay_video1][ovrly]overlay=0:0[base_video];[base_video][4]overlay=enable='between(t,0,7)':x=30:y=30[watermarked_part1];[watermarked_part1][4]overlay=enable='between(t,7,14)':x=(main_w-overlay_w-30):y=(main_h-overlay_h-10)[final_video]"



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FFMPEG Python : Encountered scale(1920, 1080) with multiple outgoing edges with same upstream label None ; a `split` filter is probably required
12 juillet, par Lysander CoxHere is the code in question :


for comment in thread['comments']:
 commentClips += fragmentConcat(comment, filePrefix)
 
 staticClip = ffmpeg.input('assets/static.mp4')
 commentClips.append(staticClip
 .filter('setsar', 1, 1)
 .filter('scale', 1920, 1080)
 )
 commentClips.append(staticClip.audio)



This code generates the following error :


ValueError: Encountered scale(1920, 1080) <6adb028f8ef5> with multiple outgoing edges with same upstream label None; a `split` filter is probably required



I have tried using only the video part of the input for the first call (e.g.
staticClip['v'].filter...
), and I have tried using thesplit
call as suggested (e.g.ffmpeg.input(...).split()
. Nothing has worked. What is the issue, and how can I rememdy it ? Thanks.

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Picture size 0x0 is invalid : trying to downsample 4k raw video into 1080 using ffmpeg
25 février 2021, par neetu siggerffmpeg -i CityAlley_3840x2160_50fps_8bit.yuv -vf scale=1920:1080 CityAlly.yuv



But I got the error :


ffmpeg version 4.2.4-1ubuntu0.1 Copyright (c) 2000-2020 the FFmpeg developers
 built with gcc 9 (Ubuntu 9.3.0-10ubuntu2)
 configuration: --prefix=/usr --extra-version=1ubuntu0.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-nvenc --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
 libavutil 56. 31.100 / 56. 31.100
 libavcodec 58. 54.100 / 58. 54.100
 libavformat 58. 29.100 / 58. 29.100
 libavdevice 58. 8.100 / 58. 8.100
 libavfilter 7. 57.100 / 7. 57.100
 libavresample 4. 0. 0 / 4. 0. 0
 libswscale 5. 5.100 / 5. 5.100
 libswresample 3. 5.100 / 3. 5.100
 libpostproc 55. 5.100 / 55. 5.100
[IMGUTILS @ 0x7fffc0509b50] Picture size 0x0 is invalid
CityAlley_3840x2160_50fps_8bit.yuv: Invalid argument