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Carte de Schillerkiez
13 mai 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Texte
Autres articles (111)
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Initialisation de MediaSPIP (préconfiguration)
20 février 2010, parLors de l’installation de MediaSPIP, celui-ci est préconfiguré pour les usages les plus fréquents.
Cette préconfiguration est réalisée par un plugin activé par défaut et non désactivable appelé MediaSPIP Init.
Ce plugin sert à préconfigurer de manière correcte chaque instance de MediaSPIP. Il doit donc être placé dans le dossier plugins-dist/ du site ou de la ferme pour être installé par défaut avant de pouvoir utiliser le site.
Dans un premier temps il active ou désactive des options de SPIP qui ne le (...) -
Script d’installation automatique de MediaSPIP
25 avril 2011, parAfin de palier aux difficultés d’installation dues principalement aux dépendances logicielles coté serveur, un script d’installation "tout en un" en bash a été créé afin de faciliter cette étape sur un serveur doté d’une distribution Linux compatible.
Vous devez bénéficier d’un accès SSH à votre serveur et d’un compte "root" afin de l’utiliser, ce qui permettra d’installer les dépendances. Contactez votre hébergeur si vous ne disposez pas de cela.
La documentation de l’utilisation du script d’installation (...) -
Que fait exactement ce script ?
18 janvier 2011, parCe script est écrit en bash. Il est donc facilement utilisable sur n’importe quel serveur.
Il n’est compatible qu’avec une liste de distributions précises (voir Liste des distributions compatibles).
Installation de dépendances de MediaSPIP
Son rôle principal est d’installer l’ensemble des dépendances logicielles nécessaires coté serveur à savoir :
Les outils de base pour pouvoir installer le reste des dépendances Les outils de développements : build-essential (via APT depuis les dépôts officiels) ; (...)
Sur d’autres sites (6665)
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Stream RAW8 video from camera using openCV and Python [Windows]
14 novembre 2022, par awinWe have a camera that streams RAW8 video at 1920x1080. The GUID used is GREY. We are able to stream video from this camera using ffmpeg on Windows with the below command :


ffmpeg -f dshow -pix_fmt gray -video_size 1920x1080 -i video="CAM0" -f nut - | ffplay -



We are now trying to grab images from this camera using OpenCV using the below code snippet, but its unable to grab any frame (frame_grabbed is always false)


import cv2
import numpy as np

# reading the video from CAM0
source = cv2.VideoCapture(1)

height = 1920
width = 1080

source.set(cv2.CAP_PROP_FRAME_WIDTH, width)
source.set(cv2.CAP_PROP_FRAME_HEIGHT, height)


image = np.zeros([height, width, 3], np.uint8)

while True:
 # Extracting the frames
 frame_grabbed , image = source.read()

 if (frame_grabbed ):
 colour1 = cv2.cvtColor(image, cv2.COLOR_BayerRG2BGR)
 cv2.imshow("Demosaiced image", colour1)
 else:
 print("No images grabbed")

#Exit on q
 key = cv2.waitKey(1)
 if key == ord("q"):
 break

# closing the window
cv2.destroyAllWindows()
source.release()




Are we missing something here ?


We then came across this post to pipe ffmpeg output to python (link). However, when we are passing the command as below :


command = [ 'ffmpeg.exe',
 '-f', 'dshow',
 '-i', 'video="CAM0"',
 '-pix_fmt', 'gray',
 '-video_size','1920x1080'
 '-f', 'nut', '-']



its throwing




Could not find video device with name ["CAM0"] among source devices
of type video. video="CAM0" : I/O error




I have verified that the camera is present using the below command :


command = [ 'ffmpeg.exe',
 '-list_devices', 'true',
 '-f', 'dshow',
 '-i', 'dummy']



This detects CAM0 as shown below :


ffmpeg version 5.0.1-full_build-www.gyan.dev Copyright (c) 2000-2022 the FFmpeg developers
 built with gcc 11.2.0 (Rev7, 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-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libdav1d --enable-libdavs2 --enable-libuavs3d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-liblensfun --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-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
 libavutil 57. 17.100 / 57. 17.100
 libavcodec 59. 18.100 / 59. 18.100
 libavformat 59. 16.100 / 59. 16.100
 libavdevice 59. 4.100 / 59. 4.100
 libavfilter 8. 24.100 / 8. 24.100
 libswscale 6. 4.100 / 6. 4.100
 libswresample 4. 3.100 / 4. 3.100
 libpostproc 56. 3.100 / 56. 3.100
[dshow @ 000001ea39e40600] "HP HD Camera" (video)
[dshow @ 000001ea39e40600] Alternative name "@device_pnp_\\?\usb#vid_04f2&pid_b6bf&mi_00#6&1737142c&0&0000#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\global"
[dshow @ 000001ea39e40600] "CAM0" (video)
[dshow @ 000001ea39e40600] Alternative name "@device_pnp_\\?\usb#vid_0400&pid_0011&mi_00#7&1affbd5b&0&0000#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\global"



In short, we are able to capture video using ffmpeg commandline, but unable to grab any frame using OpenCV videocapture or ffmpeg in opencv. Any pointers ?


Thanks !


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Combining png and mp3, why using -loop 1 on image and -shortest tag doesn't cut the output length when audio ends ?
9 novembre 2022, par AlexanderI have several image and audio files and I want to combine each of the set to a separate video file where image is stretched to audio file length. For example a lion image should be displayed as long as the lion voice is being played. The output file should end when lion audio ends.


I also try to normalize output clips resolution since image files doesn't have same width/height.


Here is the command I'm currently running. Command is on one line but I made some line breaks here for your convenience.


-loop 1 
-i "C:\Temp\screenshot\clip_1.png"
-i "C:\Temp\audio\clip_1.mp3" 
-shortest 
-filter_complex "[0:v]scale=3000:-2:force_original_aspect_ratio=decrease" 
-c:v h264_nvenc 
-c:a aac 
-b:a 192k 
-y 
C:\Temp\clips\clip_1.mp4



To my understanding the
-loop 1
before image input should make it to loop infinite and-shortest
should end the video when shortest input (audio in this case) ends. In following example, the audio file is 6 seconds long but the output is always 20 seconds.

Here is the full output of ffmpeg :


ffmpeg version 2022-11-03-git-5ccd4d3060-full_build-www.gyan.dev Copyright (c) 2000-2022 the FFmpeg developers
 built with gcc 12.1.0 (Rev2, 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-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libdav1d --enable-libdavs2 --enabl
e-libuavs3d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libaom --enable-libjxl --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --ena
ble-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libvpl --enable-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --e
nable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
 libavutil 57. 40.100 / 57. 40.100
 libavcodec 59. 51.101 / 59. 51.101
 libavformat 59. 34.101 / 59. 34.101
 libavdevice 59. 8.101 / 59. 8.101
 libavfilter 8. 49.101 / 8. 49.101
 libswscale 6. 8.112 / 6. 8.112
 libswresample 4. 9.100 / 4. 9.100
 libpostproc 56. 7.100 / 56. 7.100
Input #0, png_pipe, from 'C:\Temp\screenshot\clip_1.png':
 Duration: N/A, bitrate: N/A
 Stream #0:0: Video: png, rgba(pc), 640x148, 25 fps, 25 tbr, 25 tbn
[mp3 @ 0000016c26784a80] Estimating duration from bitrate, this may be inaccurate
Input #1, mp3, from 'C:\Temp\audio\clip_1.mp3':
 Duration: 00:00:06.10, start: 0.000000, bitrate: 32 kb/s
 Stream #1:0: Audio: mp3, 24000 Hz, mono, fltp, 32 kb/s
Stream mapping:
 Stream #0:0 (png) -> scale:default (graph 0)
 scale:default (graph 0) -> Stream #0:0 (h264_nvenc)
 Stream #1:0 -> #0:1 (mp3 (mp3float) -> aac (native))
Press [q] to stop, [?] for help
[aac @ 0000016c267ab180] Too many bits 8192.000000 > 6144 per frame requested, clamping to max
Output #0, mp4, to 'C:\Temp\clips\clip_1.mp4':
 Metadata:
 encoder : Lavf59.34.101
 Stream #0:0: Video: h264 (Main) (avc1 / 0x31637661), rgba(pc, gbr/unknown/unknown, progressive), 3000x694, q=2-31, 2000 kb/s, 25 fps, 12800 tbn
 Metadata:
 encoder : Lavc59.51.101 h264_nvenc
 Side data:
 cpb: bitrate max/min/avg: 0/0/2000000 buffer size: 4000000 vbv_delay: N/A
 Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 24000 Hz, mono, fltp, 144 kb/s
 Metadata:
 encoder : Lavc59.51.101 aac
frame= 504 fps=149 q=11.0 Lsize= 925kB time=00:00:20.00 bitrate= 378.8kbits/s speed=5.91x
video:852kB audio:67kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.645776%
[aac @ 0000016c267ab180] Qavg: 65496.695



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ffmpeg connection timeout for rtsp streams
24 décembre 2022, par Bods1994i tried to recoreds rtsp streams using ffmpeg with this command :

ffmpeg -hide_banner -loglevel error -y -rtsp_transport tcp -i rtsp://192.168.0.147:554/live/ch0 -t 600 -acodec copy -vcodec copy -metadata title="CAM1" -timeout 3 -f segment -reset_timestamps 1 -segment_time 60 -segment_atclocktime 1 -segment_format mkv -strftime 1 C:\temp\%Y%m%d_%H%M%S.mkv


If the connection is lost during recording, ffmpeg will exit within severals milliseconds.
But if the camera ist not available when connecting, it will hang forever.


I read severals posts to use "-stimeout Unrecognized option 'stimeout'. Error splitting the argument list : Option not found


For my tests i used the windows version downloaded from the two mirrors listed at https://ffmpeg.org/download.html#build-windows.
Each buils ist from 2022-12-22.


Has someone an idea how to detect conection problems and to a retry after some seconds ?