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Autres articles (48)
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Installation en mode ferme
4 février 2011, parLe mode ferme permet d’héberger plusieurs sites de type MediaSPIP en n’installant qu’une seule fois son noyau fonctionnel.
C’est la méthode que nous utilisons sur cette même plateforme.
L’utilisation en mode ferme nécessite de connaïtre un peu le mécanisme de SPIP contrairement à la version standalone qui ne nécessite pas réellement de connaissances spécifique puisque l’espace privé habituel de SPIP n’est plus utilisé.
Dans un premier temps, vous devez avoir installé les mêmes fichiers que l’installation (...) -
MediaSPIP Init et Diogène : types de publications de MediaSPIP
11 novembre 2010, parÀ l’installation d’un site MediaSPIP, le plugin MediaSPIP Init réalise certaines opérations dont la principale consiste à créer quatre rubriques principales dans le site et de créer cinq templates de formulaire pour Diogène.
Ces quatre rubriques principales (aussi appelées secteurs) sont : Medias ; Sites ; Editos ; Actualités ;
Pour chacune de ces rubriques est créé un template de formulaire spécifique éponyme. Pour la rubrique "Medias" un second template "catégorie" est créé permettant d’ajouter (...) -
Installation en mode standalone
4 février 2011, parL’installation de la distribution MediaSPIP se fait en plusieurs étapes : la récupération des fichiers nécessaires. À ce moment là deux méthodes sont possibles : en installant l’archive ZIP contenant l’ensemble de la distribution ; via SVN en récupérant les sources de chaque modules séparément ; la préconfiguration ; l’installation définitive ;
[mediaspip_zip]Installation de l’archive ZIP de MediaSPIP
Ce mode d’installation est la méthode la plus simple afin d’installer l’ensemble de la distribution (...)
Sur d’autres sites (3544)
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FFMPEG attach thumbnail to first frame of the video
31 août 2021, par MwthreexI want to attach/append an image (something like youtube) to first frame of the video, i tried this command :


ffmpeg -i video.mp4 -i image.png -map 1 -map 0 -c copy -disposition:0 attached_pic out.mp4


But it doesnt working, the first frame is not my custom image


my ffmpeg version :




ffmpeg version n4.4-80-gbf87bdd3f6-20210830 Copyright (c) 2000-2021 the FFmpeg developers




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Mixing and overlaying audio into a 4x4 video with -ffmpeg-
31 août 2021, par Clive NicholasThanks to @llogan in reply to my post here, I've been able to merge 16 different videos into a 4x4 .mp4 movie.


Unfortunately, I'm also looking to add in the audio from those 16 clips as well as overlay them. With the code as it is, it takes the audio from the first clip declared in the call.


I tried :


ffmpeg -i a.mp4 -i b.mp4 -i c.mp4 -i d.mp4 -i e.mp4 -i f.mp4 -i g.mp4 -i h.mp4 -i i.mp4 -i j.mp4 -i k.mp4 -i l.mp4 -i m.mp4 -i n.mp4 -i o.mp4 -i q.mp4 -i p.mp4 \
 -filter_complex \
 "[0:v]scale=iw/4:-1[v0];[1:v]scale=iw/4:-1[v1];[2:v]scale=iw/4:-1[v2]; \ 
 [3:v]scale=iw/4:-1[v3];[4:v]scale=iw/4:-1[v4];[5:v]scale=iw/4:-1[v5]; \
 [6:v]scale=iw/4:-1[v6];[7:v]scale=iw/4:-1[v7];[8:v]scale=iw/4:-1[v8]; \ 
 [9:v]scale=iw/4:-1[v9];[10:v]scale=iw/4:-1[v10];[11:v]scale=iw/4:-1[v11]; \
 [12:v]scale=iw/4:-1[v12];[13:v]scale=iw/4:-1[v13];[14:v]scale=iw/4:-1[v14]; \ 
 [15:v]scale=iw/4:-1[v15]; \
 [v0][v1][v2][v3][v4][v5][v6][v7][v8][v9][v10][v11][v12][v13][v14] 
[v15]xstack=inputs=16:layout=0_0|w0_0|w0+w1_0|w0+w1+w2_0|0_h0|w4_h0|w4+w5_h0|w4+w5+w6_h0|0_h0+h4|w8_h0+h4|w8+w9_h0+h4|w8+w9+w10_h0+h4|0_h0+h4+h8|w12_h0+h4+h8|w12+w13_h0+h4+h8|w12+w13+w14_h0+h4+h8; \
 [0:a][1:a][2:a][3:a][4:a][5:a][6:a][7:a][8:a][9:a][10:a][11:a][12:a][13:a][14:a][15:a]amerge=inputs=16[a]" \
 -map "[a]" -ac 2 \
output.mp4


whilst incorporating that third-last line as an attempt to merge audio inputs, but it produces :


ffmpeg version 4.3.2-0+deb11u1ubuntu1 Copyright (c) 2000-2021 the FFmpeg developers
 built with gcc 10 (Ubuntu 10.2.1-20ubuntu1)
 configuration: --prefix=/usr --extra-version=0+deb11u1ubuntu1 --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-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libdav1d --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-librabbitmq --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --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-pocketsphinx --enable-libmfx --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-nvenc --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
 WARNING: library configuration mismatch
 avcodec configuration: --prefix=/usr --extra-version=0+deb11u1ubuntu1 --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-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libdav1d --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-librabbitmq --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --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-pocketsphinx --enable-libmfx --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-nvenc --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared --enable-version3 --disable-doc --disable-programs --enable-libaribb24 --enable-liblensfun --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libtesseract --enable-libvo_amrwbenc
 libavutil 56. 51.100 / 56. 51.100
 libavcodec 58. 91.100 / 58. 91.100
 libavformat 58. 45.100 / 58. 45.100
 libavdevice 58. 10.100 / 58. 10.100
 libavfilter 7. 85.100 / 7. 85.100
 libavresample 4. 0. 0 / 4. 0. 0
 libswscale 5. 7.100 / 5. 7.100
 libswresample 3. 7.100 / 3. 7.100
 libpostproc 55. 7.100 / 55. 7.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'ang.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf58.45.100
 Duration: 00:00:10.00, start: 0.000000, bitrate: 480 kb/s
 Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360, 271 kb/s, 60 fps, 60 tbr, 15360 tbn, 120 tbc (default)
 Metadata:
 handler_name : VideoHandler
 Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 194 kb/s (default)
 Metadata:
 handler_name : SoundHandler
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'atv.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf58.45.100
 Duration: 00:00:17.00, start: 0.000000, bitrate: 259 kb/s
 Stream #1:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360, 53 kb/s, 60 fps, 60 tbr, 15360 tbn, 120 tbc (default)
 Metadata:
 handler_name : VideoHandler
 Stream #1:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 193 kb/s (default)
 Metadata:
 handler_name : SoundHandler
Input #2, mov,mp4,m4a,3gp,3g2,mj2, from 'bor.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf58.45.100
 Duration: 00:00:09.00, start: 0.000000, bitrate: 255 kb/s
 Stream #2:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360, 48 kb/s, 60 fps, 60 tbr, 15360 tbn, 120 tbc (default)
 Metadata:
 handler_name : VideoHandler
 Stream #2:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 192 kb/s (default)
 Metadata:
 handler_name : SoundHandler
Input #3, mov,mp4,m4a,3gp,3g2,mj2, from 'cen.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf58.45.100
 Duration: 00:00:07.00, start: 0.000000, bitrate: 461 kb/s
 Stream #3:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360, 250 kb/s, 60 fps, 60 tbr, 15360 tbn, 120 tbc (default)
 Metadata:
 handler_name : VideoHandler
 Stream #3:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 196 kb/s (default)
 Metadata:
 handler_name : SoundHandler
Input #4, mov,mp4,m4a,3gp,3g2,mj2, from 'cha.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf58.45.100
 Duration: 00:00:05.00, start: 0.000000, bitrate: 267 kb/s
 Stream #4:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360, 59 kb/s, 60 fps, 60 tbr, 15360 tbn, 120 tbc (default)
 Metadata:
 handler_name : VideoHandler
 Stream #4:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 194 kb/s (default)
 Metadata:
 handler_name : SoundHandler
Input #5, mov,mp4,m4a,3gp,3g2,mj2, from 'grd.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf58.45.100
 Duration: 00:00:07.00, start: 0.000000, bitrate: 235 kb/s
 Stream #5:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360, 28 kb/s, 60 fps, 60 tbr, 15360 tbn, 120 tbc (default)
 Metadata:
 handler_name : VideoHandler
 Stream #5:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 193 kb/s (default)
 Metadata:
 handler_name : SoundHandler
Input #6, mov,mp4,m4a,3gp,3g2,mj2, from 'grm.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf58.45.100
 Duration: 00:00:09.00, start: 0.000000, bitrate: 294 kb/s
 Stream #6:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360, 86 kb/s, 60 fps, 60 tbr, 15360 tbn, 120 tbc (default)
 Metadata:
 handler_name : VideoHandler
 Stream #6:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 195 kb/s (default)
 Metadata:
 handler_name : SoundHandler
Input #7, mov,mp4,m4a,3gp,3g2,mj2, from 'htv.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf58.45.100
 Duration: 00:00:12.01, start: 0.000000, bitrate: 238 kb/s
 Stream #7:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360, 29 kb/s, 60 fps, 60 tbr, 15360 tbn, 120 tbc (default)
 Metadata:
 handler_name : VideoHandler
 Stream #7:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 196 kb/s (default)
 Metadata:
 handler_name : SoundHandler
Input #8, mov,mp4,m4a,3gp,3g2,mj2, from 'lwt.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf58.45.100
 Duration: 00:00:10.00, start: 0.000000, bitrate: 239 kb/s
 Stream #8:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360, 30 kb/s, 60 fps, 60 tbr, 15360 tbn, 120 tbc (default)
 Metadata:
 handler_name : VideoHandler
 Stream #8:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 195 kb/s (default)
 Metadata:
 handler_name : SoundHandler
Input #9, mov,mp4,m4a,3gp,3g2,mj2, from 'sou.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf58.45.100
 Duration: 00:00:08.00, start: 0.000000, bitrate: 247 kb/s
 Stream #9:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360, 39 kb/s, 60 fps, 60 tbr, 15360 tbn, 120 tbc (default)
 Metadata:
 handler_name : VideoHandler
 Stream #9:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 194 kb/s (default)
 Metadata:
 handler_name : SoundHandler
Input #10, mov,mp4,m4a,3gp,3g2,mj2, from 'stv.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf58.45.100
 Duration: 00:00:09.00, start: 0.000000, bitrate: 257 kb/s
 Stream #10:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360, 51 kb/s, 60 fps, 60 tbr, 15360 tbn, 120 tbc (default)
 Metadata:
 handler_name : VideoHandler
 Stream #10:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 192 kb/s (default)
 Metadata:
 handler_name : SoundHandler
Input #11, mov,mp4,m4a,3gp,3g2,mj2, from 'tha.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf58.45.100
 Duration: 00:00:06.00, start: 0.000000, bitrate: 454 kb/s
 Stream #11:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360, 245 kb/s, 60 fps, 60 tbr, 15360 tbn, 120 tbc (default)
 Metadata:
 handler_name : VideoHandler
 Stream #11:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 194 kb/s (default)
 Metadata:
 handler_name : SoundHandler
Input #12, mov,mp4,m4a,3gp,3g2,mj2, from 'ttt.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf58.45.100
 Duration: 00:00:10.01, start: 0.000000, bitrate: 258 kb/s
 Stream #12:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360, 51 kb/s, 60 fps, 60 tbr, 15360 tbn, 120 tbc (default)
 Metadata:
 handler_name : VideoHandler
 Stream #12:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 193 kb/s (default)
 Metadata:
 handler_name : SoundHandler
Input #13, mov,mp4,m4a,3gp,3g2,mj2, from 'utv.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf58.45.100
 Duration: 00:00:08.00, start: 0.000000, bitrate: 443 kb/s
 Stream #13:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360, 234 kb/s, 60 fps, 60 tbr, 15360 tbn, 120 tbc (default)
 Metadata:
 handler_name : VideoHandler
 Stream #13:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 194 kb/s (default)
 Metadata:
 handler_name : SoundHandler
Input #14, mov,mp4,m4a,3gp,3g2,mj2, from 'wtv.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf58.45.100
 Duration: 00:00:08.00, start: 0.000000, bitrate: 431 kb/s
 Stream #14:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360, 224 kb/s, 60 fps, 60 tbr, 15360 tbn, 120 tbc (default)
 Metadata:
 handler_name : VideoHandler
 Stream #14:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 194 kb/s (default)
 Metadata:
 handler_name : SoundHandler
Input #15, mov,mp4,m4a,3gp,3g2,mj2, from 'ytv.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf58.45.100
 Duration: 00:00:08.00, start: 0.000000, bitrate: 332 kb/s
 Stream #15:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360, 123 kb/s, 60 fps, 60 tbr, 15360 tbn, 120 tbc (default)
 Metadata:
 handler_name : VideoHandler
 Stream #15:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 195 kb/s (default)
 Metadata:
 handler_name : SoundHandler
File 'output.mp4' already exists. Overwrite? [y/N] y
Stream mapping:
 Stream #0:0 (h264) -> scale
 Stream #0:1 (aac) -> amerge:in0
 Stream #1:0 (h264) -> scale
 Stream #1:1 (aac) -> amerge:in1
 Stream #2:0 (h264) -> scale
 Stream #2:1 (aac) -> amerge:in2
 Stream #3:0 (h264) -> scale
 Stream #3:1 (aac) -> amerge:in3
 Stream #4:0 (h264) -> scale
 Stream #4:1 (aac) -> amerge:in4
 Stream #5:0 (h264) -> scale
 Stream #5:1 (aac) -> amerge:in5
 Stream #6:0 (h264) -> scale
 Stream #6:1 (aac) -> amerge:in6
 Stream #7:0 (h264) -> scale
 Stream #7:1 (aac) -> amerge:in7
 Stream #8:0 (h264) -> scale
 Stream #8:1 (aac) -> amerge:in8
 Stream #9:0 (h264) -> scale
 Stream #9:1 (aac) -> amerge:in9
 Stream #10:0 (h264) -> scale
 Stream #10:1 (aac) -> amerge:in10
 Stream #11:0 (h264) -> scale
 Stream #11:1 (aac) -> amerge:in11
 Stream #12:0 (h264) -> scale
 Stream #12:1 (aac) -> amerge:in12
 Stream #13:0 (h264) -> scale
 Stream #13:1 (aac) -> amerge:in13
 Stream #14:0 (h264) -> scale
 Stream #14:1 (aac) -> amerge:in14
 Stream #15:0 (h264) -> scale
 Stream #15:1 (aac) -> amerge:in15
 xstack -> Stream #0:0 (libx264)
 amerge -> Stream #0:1 (aac)
Press [q] to stop, [?] for help
[Parsed_amerge_17 @ 0x558494cd1180] No channel layout for input 1
[Parsed_amerge_17 @ 0x558494cd1180] Input channel layouts overlap: output layout will be determined by the number of distinct input channels
[auto_resampler_16 @ 0x558494ce5fc0] [SWR @ 0x558494e3cb40] Input channel layout '32 channels (FL+FR+FC+LFE+BL+BR+FLC+FRC+BC+SL+SR+TC+TFL+TFC+TFR+TBL+TBC+TBR+DL+DR+WL)' is not supported
[auto_resampler_16 @ 0x558494ce5fc0] Failed to configure output pad on auto_resampler_16
Error reinitializing filters!
Failed to inject frame into filter network: Invalid argument
Error while processing the decoded data for stream #15:0
Conversion failed!


Using other options in place of that call, such as :


[0][over] overlay=0:0[v];[0][1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]amix[a]


produces :


[AVFilterGraph @ 0x55ddeb2032c0] Too many inputs specified for the "amix" filter.
Error initializing complex filters.
Invalid argument


I've scoured several SO pages on this - many with solutions to slightly different questions from @llogan, @Gyan and other experts - but, unfortunately, none has worked.


No doubt the solution is very obvious, but not to me ! Can anybody please assist ? I'd be grateful to you if you could.


-
Simultaneously adding a 2-second delay and delaying one of the inputs in -ffmpeg-
2 septembre 2021, par Clive NicholasI want to add two seconds of silent blackspace at the beginning my multi-screen movie and effectively bring forward the start of one of the inputs (video and audio) by three seconds, with all the other inputs starting after this.


Here's a 3x3 grid example of what I'm trying to do :


ffmpeg -i r.mp4 -i s.mp4 -i t.mp4 -i u.mp4 -i v.mp4 -i w.mp4 -i x.mp4 -i y.mp4 -i z.mp4 -filter_complex "[0:v]scale=iw/5:-1[v0];[1:v]scale=iw/3:-1[v1];[2:v]scale=iw/3:-1[v2];[3:v]scale=iw/3:-1[v3];[4:v]scale=iw/3:-1[v4];[5:v]scale=iw/3:-1[v5];[6:v]scale=iw/3:-1[v6];[7:v]scale=iw/3:-1[v7];[8:v]scale=iw/3:-1[v8];[0:v]tpad=start_duration=3[v0];[1:v]tpad=start_duration=3[v1];[2:v]tpad=start_duration=3[v2];[3:v]tpad=start_duration=0[v3];[4:v]tpad=start_duration=3[v4];[5:v]tpad=start_duration=3[v5];[6:v]tpad=start_duration=3[v6];[7:v]tpad=start_duration=3[v7];[8:v]tpad=start_duration=3[v8];[1:a]adelay=3s:all=true[a1];[2:a]adelay=3s:all=true[a2];[3:a]adelay=3s:all=true[a3];[4:a]adelay=0s:all=true[a4];[5:a]adelay=3s:all=true[a5];[6:a]adelay=3s:all=true[a6];[7:a]adelay=3s:all=true[a7];[8:a]adelay=3s:all=true[a7];[8:a]adelay=3s:all=true[a8];[v0][v1][v2][v3][v4][v5][v6][v7][v8]xstack=inputs=9:layout=0_0|0_h0|0_h0+h1|w0_0|w0_h0|w0_h0+h1|w0+w4_0|w0+w4_h0|w0+w4_h0+h1;[0:a][1:a][2:a][3:a][4:a][5:a][6:a][7:a][8:a]amix=inputs=9" -vsync 2 output.mp4


The resulting output is :


ffmpeg version 4.3.2-0+deb11u1ubuntu1 Copyright (c) 2000-2021 the FFmpeg developers
 built with gcc 10 (Ubuntu 10.2.1-20ubuntu1)
 configuration: --prefix=/usr --extra-version=0+deb11u1ubuntu1 --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-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libdav1d --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-librabbitmq --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --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-pocketsphinx --enable-libmfx --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-nvenc --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
 WARNING: library configuration mismatch
 avcodec configuration: --prefix=/usr --extra-version=0+deb11u1ubuntu1 --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-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libdav1d --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-librabbitmq --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --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-pocketsphinx --enable-libmfx --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-nvenc --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared --enable-version3 --disable-doc --disable-programs --enable-libaribb24 --enable-liblensfun --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libtesseract --enable-libvo_amrwbenc
 libavutil 56. 51.100 / 56. 51.100
 libavcodec 58. 91.100 / 58. 91.100
 libavformat 58. 45.100 / 58. 45.100
 libavdevice 58. 10.100 / 58. 10.100
 libavfilter 7. 85.100 / 7. 85.100
 libavresample 4. 0. 0 / 4. 0. 0
 libswscale 5. 7.100 / 5. 7.100
 libswresample 3. 7.100 / 3. 7.100
 libpostproc 55. 7.100 / 55. 7.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'r.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf58.45.100
 Duration: 00:00:08.00, start: 0.000000, bitrate: 248 kb/s
 Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360, 41 kb/s, 60 fps, 60 tbr, 15360 tbn, 120 tbc (default)
 Metadata:
 handler_name : VideoHandler
 Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 193 kb/s (default)
 Metadata:
 handler_name : SoundHandler
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 's.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf58.45.100
 Duration: 00:00:10.00, start: 0.000000, bitrate: 480 kb/s
 Stream #1:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360, 271 kb/s, 60 fps, 60 tbr, 15360 tbn, 120 tbc (default)
 Metadata:
 handler_name : VideoHandler
 Stream #1:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 194 kb/s (default)
 Metadata:
 handler_name : SoundHandler
Input #2, mov,mp4,m4a,3gp,3g2,mj2, from 't.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf58.45.100
 Duration: 00:00:09.00, start: 0.000000, bitrate: 256 kb/s
 Stream #2:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360, 49 kb/s, 60 fps, 60 tbr, 15360 tbn, 120 tbc (default)
 Metadata:
 handler_name : VideoHandler
 Stream #2:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 193 kb/s (default)
 Metadata:
 handler_name : SoundHandler
Input #3, mov,mp4,m4a,3gp,3g2,mj2, from 'u.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf58.45.100
 Duration: 00:00:17.00, start: 0.000000, bitrate: 259 kb/s
 Stream #3:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360, 53 kb/s, 60 fps, 60 tbr, 15360 tbn, 120 tbc (default)
 Metadata:
 handler_name : VideoHandler
 Stream #3:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 193 kb/s (default)
 Metadata:
 handler_name : SoundHandler
Input #4, mov,mp4,m4a,3gp,3g2,mj2, from 'v.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf58.45.100
 Duration: 00:00:09.00, start: 0.000000, bitrate: 255 kb/s
 Stream #4:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360, 48 kb/s, 60 fps, 60 tbr, 15360 tbn, 120 tbc (default)
 Metadata:
 handler_name : VideoHandler
 Stream #4:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 192 kb/s (default)
 Metadata:
 handler_name : SoundHandler
Input #5, mov,mp4,m4a,3gp,3g2,mj2, from 'w.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf58.45.100
 Duration: 00:00:07.00, start: 0.000000, bitrate: 461 kb/s
 Stream #5:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360, 250 kb/s, 60 fps, 60 tbr, 15360 tbn, 120 tbc (default)
 Metadata:
 handler_name : VideoHandler
 Stream #5:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 196 kb/s (default)
 Metadata:
 handler_name : SoundHandler
Input #6, mov,mp4,m4a,3gp,3g2,mj2, from 'x.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf58.45.100
 Duration: 00:00:05.00, start: 0.000000, bitrate: 267 kb/s
 Stream #6:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360, 59 kb/s, 60 fps, 60 tbr, 15360 tbn, 120 tbc (default)
 Metadata:
 handler_name : VideoHandler
 Stream #6:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 194 kb/s (default)
 Metadata:
 handler_name : SoundHandler
Input #7, mov,mp4,m4a,3gp,3g2,mj2, from 'y.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf58.45.100
 Duration: 00:00:05.01, start: 0.000000, bitrate: 246 kb/s
 Stream #7:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360, 39 kb/s, 60 fps, 60 tbr, 15360 tbn, 120 tbc (default)
 Metadata:
 handler_name : VideoHandler
 Stream #7:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 192 kb/s (default)
 Metadata:
 handler_name : SoundHandler
Input #8, mov,mp4,m4a,3gp,3g2,mj2, from 'z.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf58.45.100
 Duration: 00:00:09.00, start: 0.000000, bitrate: 294 kb/s
 Stream #8:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360, 86 kb/s, 60 fps, 60 tbr, 15360 tbn, 120 tbc (default)
 Metadata:
 handler_name : VideoHandler
 Stream #8:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 195 kb/s (default)
 Metadata:
 handler_name : SoundHandler
File 'output.mp4' already exists. Overwrite? [y/N] y
Filter adelay has an unconnected output


This is odd (to me) because I've faithfully followed Lou Logan's example under the section entitled Delaying/pausing videos here, but yet my code still chokes on errors. Basically, I cannot clearly see which
adelaycall (if only one of them ; it maybe all nine of them) is 'unconnected' and why.

What's the solution here ? Again, it's probably obvious !


Many thanks as always, Clive


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