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Autres articles (98)
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MediaSPIP 0.1 Beta version
25 avril 2011, parMediaSPIP 0.1 beta is the first version of MediaSPIP proclaimed as "usable".
The zip file provided here only contains the sources of MediaSPIP in its standalone version.
To get a working installation, you must manually install all-software dependencies on the server.
If you want to use this archive for an installation in "farm mode", you will also need to proceed to other manual (...) -
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 (...) -
Possibilité de déploiement en ferme
12 avril 2011, parMediaSPIP peut être installé comme une ferme, avec un seul "noyau" hébergé sur un serveur dédié et utilisé par une multitude de sites différents.
Cela permet, par exemple : de pouvoir partager les frais de mise en œuvre entre plusieurs projets / individus ; de pouvoir déployer rapidement une multitude de sites uniques ; d’éviter d’avoir à mettre l’ensemble des créations dans un fourre-tout numérique comme c’est le cas pour les grandes plate-formes tout public disséminées sur le (...)
Sur d’autres sites (7643)
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Black screen when recording specific screen / window using ffmpeg [closed]
16 mai, par Mark BrinIssue :
I'm trying to capture the specific window using
ffmpeg
& i've tried these below command for that :

ffmpeg -f gdigrab -framerate 30 -i title="Window Title" -b:v 3M -pix_fmt yuv420p output_FILENAME.webm



And also try changing output format to
.mp4


ffmpeg -f gdigrab -framerate 30 -i title="Window Title" -b:v 3M -pix_fmt yuv420p output_FILENAME.mp4



but the output video just shows the black screen with cursor.


What i've tried :


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Tried online solutions like Recording Screen with FFmpeg, How to record a specific window using ffmpeg ?, Record specific window using ffmpeg, but none of them worked.


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even tried some of the tweaks like removing flags like
-pix_fmt yuv420p
also tried-f d3d11grab
but didn't work.

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When i try desktop capture it works completely fine.


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I'm using this command to confirm that i'm using correct window title












Get-Process |
 Where-Object { $_.MainWindowTitle -ne "" } |
 Select-Object -Unique MainWindowTitle



System I'm using :


Windows 11


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Overlaying one video on another one and making black pixels or green pixels transparent
30 décembre 2017, par kostya572I found great answer here : https://stackoverflow.com/a/38581696/2337706
It works only for black pixels. The result is not perfect. I guess if change the overlay background color to other color, e.g. green, red, blue the results would be better. How can I change the other background color ?
Here is my working code :
ffmpeg -y \
-i video.webm -i overlay.mov \
-filter_complex " \
[0:v]setpts=PTS-STARTPTS[base]; \
[1:v]crop=iw:0.50*ih,setpts=PTS-STARTPTS+0/TB, \
format=yuva420p,colorchannelmixer=aa=0.7[overlay]; \
[base][overlay]overlay=x=(W-w)/2:y=0[v]" \
-map "[v]" -map 0:a -c:a copy -c:v libvpx-vp9 -lossless 1 -threads 4 -quality realtime \
-speed 8 -tile-columns 6 -frame-parallel 1 -vsync 2 -shortest output.webmOr need result (if impossible first with good quality) :
Thank you, sorry for the frequent questions on ffpmpeg topic.
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How do I use ffmpeg to concatenate 2 videos and add a period of silence + black screen between them ?
29 avril 2022, par masotimeThere are several existing examples, but I'd like a single command that uses complex_filter to achieve the objective without doing extra things like generating blank video / audio files.


Looking around, this is the best I've come up with so far :


ffmpeg -i video1.mp4 -i video2.mp4 -filter_complex "color=black:s=960x540:d=1[b0];aevalsrc=0:d=1[s0];[0:v:0][0:a:0][b0][s0][1:v:0][1:a:0]concat=n=3:v=1:a=1[outv][outa]" -map '[outv]' -map '[outa]' out.mp4



My understanding of the breakdown of such a command is


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- specify 2 inputs
- define a complex filter
- define a black video stream of duration 1s and call it b0
- define a silent audio stream of duration 1s and call it s0
- pipe it through the concat filter with












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- First stream : [0:v:0][0:a:0] // video1.mp4
- Second stream : [b0][s0] // stuff I defined earlier
- Third stream : [1:v:0][1:a:0] // video2.mp4








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- define 2 output streams [outv][outa] for video and audio respectively
- combine them into out.mp4






All file inputs are correctly 960x540, all using the same audio and video codecs but ffmpeg gives me this error and starts using 100% CPU


More than 1000 frames duplicated



I think there's something wrong with the streams I'm defining in the filter - what's wrong ? Do I need to specify more parameters somewhere ?


EDIT : Here's a MediaInfo printout of the input video's metadata


Format : MPEG-4
Format profile : Base Media
Codec ID : isom (isom/iso2/mp41)
File size : 7.82 MiB
Duration : 31 s 449 ms
Overall bit rate : 2 086 kb/s
Writing application : Lavf59.16.100

Video
ID : 1
Format : HEVC
Format/Info : High Efficiency Video Coding
Format profile : Main@L3@Main
Codec ID : hvc1
Codec ID/Info : High Efficiency Video Coding
Duration : 31 s 449 ms
Bit rate : 1 973 kb/s
Maximum bit rate : 2 000 kb/s
Width : 960 pixels
Height : 540 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 23.976 (24000/1001) FPS
Color space : YUV
Chroma subsampling : 4:2:0 (Type 0)
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.159
Stream size : 7.40 MiB (95%)
Writing library : x265 3.4+31-6722fce1f:[Mac OS X][clang 12.0.0][64 bit] 8bit+10bit+12bit
Encoding settings : cpuid=1111039 / frame-threads=4 / wpp / no-pmode / no-pme / no-psnr / no-ssim / log-level=2 / input-csp=1 / input-res=960x540 / interlace=0 / total-frames=0 / level-idc=0 / high-tier=1 / uhd-bd=0 / ref=3 / no-allow-non-conformance / no-repeat-headers / annexb / no-aud / no-hrd / info / hash=0 / no-temporal-layers / open-gop / min-keyint=23 / keyint=250 / gop-lookahead=0 / bframes=4 / b-adapt=2 / b-pyramid / bframe-bias=0 / rc-lookahead=20 / lookahead-slices=0 / scenecut=40 / hist-scenecut=0 / radl=0 / no-splice / no-intra-refresh / ctu=64 / min-cu-size=8 / no-rect / no-amp / max-tu-size=32 / tu-inter-depth=1 / tu-intra-depth=1 / limit-tu=0 / rdoq-level=0 / dynamic-rd=0.00 / no-ssim-rd / signhide / no-tskip / nr-intra=0 / nr-inter=0 / no-constrained-intra / strong-intra-smoothing / max-merge=3 / limit-refs=1 / no-limit-modes / me=1 / subme=2 / merange=57 / temporal-mvp / no-frame-dup / no-hme / weightp / no-weightb / no-analyze-src-pics / deblock=0:0 / sao / no-sao-non-deblock / rd=3 / selective-sao=4 / early-skip / rskip / no-fast-intra / no-tskip-fast / no-cu-lossless / b-intra / no-splitrd-skip / rdpenalty=0 / psy-rd=2.00 / psy-rdoq=0.00 / no-rd-refine / no-lossless / cbqpoffs=0 / crqpoffs=0 / rc=abr / bitrate=2000 / qcomp=0.60 / qpstep=4 / stats-write=1 / stats-read=0 / slow-firstpass / ipratio=1.40 / pbratio=1.30 / aq-mode=2 / aq-strength=1.00 / cutree / zone-count=0 / no-strict-cbr / qg-size=32 / no-rc-grain / qpmax=69 / qpmin=0 / no-const-vbv / sar=1 / overscan=0 / videoformat=5 / range=0 / colorprim=1 / transfer=1 / colormatrix=1 / chromaloc=1 / chromaloc-top=0 / chromaloc-bottom=0 / display-window=0 / cll=0,0 / min-luma=0 / max-luma=255 / log2-max-poc-lsb=8 / vui-timing-info / vui-hrd-info / slices=1 / no-opt-qp-pps / no-opt-ref-list-length-pps / no-multi-pass-opt-rps / scenecut-bias=0.05 / hist-threshold=0.03 / no-opt-cu-delta-qp / no-aq-motion / no-hdr10 / no-hdr10-opt / no-dhdr10-opt / no-idr-recovery-sei / analysis-reuse-level=0 / analysis-save-reuse-level=0 / analysis-load-reuse-level=0 / scale-factor=0 / refine-intra=0 / refine-inter=0 / refine-mv=1 / refine-ctu-distortion=0 / no-limit-sao / ctu-info=0 / no-lowpass-dct / refine-analysis-type=0 / copy-pic=1 / max-ausize-factor=1.0 / no-dynamic-refine / no-single-sei / no-hevc-aq / no-svt / no-field / qp-adaptation-range=1.00 / scenecut-aware-qp=0conformance-window-offsets / right=0 / bottom=0 / decoder-max-rate=0 / no-vbv-live-multi-pass
Color range : Limited
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.709
Codec configuration box : hvcC

Audio
ID : 2
Format : AAC LC
Format/Info : Advanced Audio Codec Low Complexity
Codec ID : mp4a-40-2
Duration : 31 s 449 ms
Source duration : 31 s 492 ms
Source_Duration_LastFrame : -17 ms
Bit rate mode : Constant
Bit rate : 106 kb/s
Channel(s) : 2 channels
Channel layout : L R
Sampling rate : 48.0 kHz
Frame rate : 46.875 FPS (1024 SPF)
Compression mode : Lossy
Stream size : 405 KiB (5%)
Source stream size : 406 KiB (5%)
Title : Core Media Audio
Language : English
Default : Yes
Alternate group : 1