
Recherche avancée
Autres articles (60)
-
Demande de création d’un canal
12 mars 2010, parEn fonction de la configuration de la plateforme, l’utilisateur peu avoir à sa disposition deux méthodes différentes de demande de création de canal. La première est au moment de son inscription, la seconde, après son inscription en remplissant un formulaire de demande.
Les deux manières demandent les mêmes choses fonctionnent à peu près de la même manière, le futur utilisateur doit remplir une série de champ de formulaire permettant tout d’abord aux administrateurs d’avoir des informations quant à (...) -
Des sites réalisés avec MediaSPIP
2 mai 2011, parCette page présente quelques-uns des sites fonctionnant sous MediaSPIP.
Vous pouvez bien entendu ajouter le votre grâce au formulaire en bas de page. -
Contribute to a better visual interface
13 avril 2011MediaSPIP is based on a system of themes and templates. Templates define the placement of information on the page, and can be adapted to a wide range of uses. Themes define the overall graphic appearance of the site.
Anyone can submit a new graphic theme or template and make it available to the MediaSPIP community.
Sur d’autres sites (8054)
-
FFmpeg - divide single .webm video into multiple videos (each representing part of the screen) specifying rows and columns count
23 mai 2022, par salveiroCan FFmpeg divide one big rectangular video into x smaller rectangular ones ?
What would be a command for it ?


Can we parametrize the command with number of rows and columns we desire ?


Can we somehow prevent loosing pixel precision when command is provided with improper rows/column count for source video resolution ?


-
ffmpeg usb Web cam recording terminates randomly before set duration
16 mars 2018, par pomptondriveThe output of this script is just fine ; it’s pretty much what I want. But it seems to terminate randomly. My next step will be to try this on another computer to see if the issue persists.
My configuration :
Dell Precision laptop, m4400
2x Intel(R) Core(TM)2 Duo CPU P8600 @ 2.40GHz
Linux Mint 18.3 Sylvia
Kernel : Linux 4.4.0-116-generic (x86_64)
Card : NVIDIA G96GLM [Quadro FX 770M]
ffmpeg version 2.8.11-0ubuntu0.16.04.1
USB Camera-B4.09.24.1 Sony Playstation EyeAnd this is the script that I’m running - the last time it recorded for about three hours and forty-five minutes, before that it was about 55 minutes ; once it ran five and a half hours :
#!/bin/bash
echo "This is a shell script to make a timelapse video."
ffmpeg \
-f v4l2 -input_format yuyv422 -video_size 640x480 -framerate 5 -t 09:00:00 -i /dev/video0 \
-vf "select=not(mod(n\,5)),setpts=N/(60*TB),fps=60, drawtext=fontfile=/usr/share/fonts/truetype/dejavu/DejaVuSansMono.ttf:text='%{localtime\:%T}':x=20:y=20:fontcolor=white" \
-c:v libx264 -preset superfast -crf 23 -pix_fmt yuv422p -g 15 -keyint_min 15 \
-f mpegts /media/dkm/OneTB/Video/Timelapse_$(date +%Y-%m-%d_%H.%M.%S).tsAny suggestions would be appreciated. Thanks !
-
FFMPEG extract frame-accurate video fragments with minimal transcoding
9 mars 2018, par LeeroyHow can I extract frame-accurate video or audio fragments using FFMPEG without transcoding the full portion ?
ffmpeg -i input.mp4 -ss 00:00:01.234 -to 00:00:05.678 output.mp4
works because it re-encodes... If I use-codec: copy
then it disregards the precision of my start and end time arguments and instead uses the closest keyframe (I understand).Is there a command or combination of commands to instruct FFMPEG to transcode only what’s needed, the bits near the start/end markers, up to keyframes ?
EDIT : A bit of context... I’m trying to write this function to process video piped from
youtube-dl
, perhaps even as a service. So it matters that I minimize bandwidth (downloading to timestamp and discarding after) and CPU utilization (re-encoding all of the fragment).