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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
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Sur d’autres sites (11775)
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libavcodec.so.58 not found when running software compiled with opencv
22 avril, par AbinayaI am using ubuntu 22.04. Now every time I try to run software compiled with Opencv, I get the following error :


`libavcodec.so.58 => not found
 libavformat.so.58 => not found
 libavutil.so.56 => not found
 libswscale.so.5 => not found
`


Looking around /lib/x86_64-linux-gnu/, I can find libavcodec.so.59, but not libavcodec.so.58.


When trying to run sudo apt-get install libavcodec58, I get :


Package 'libavcodec58' has no installation candidate


I've scoured the internet in search of an answer, but could not find anything at this point. Any help with solving this problem will be very much appreciated.


I have tried to recreate symbolic link with
'ls -l libavcodec.so.59'
1 root root 23 Aug 10 2024 libavcodec.so.59 ->libavcodec.so.59.37.100`


'dconfig -vl libavcodec.so.59.37.100'
libavcodec.so.59 -> libavcodec.so.59.37.100`


But I am still struck


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OpenCV on MacOS : Match Camera Index and Name
15 janvier, par rpi_guruI have a builtin camera and a USB webcam connected to my MacOS.


Here is a result of
system_profiler SPCameraDataType -xmlcommand :

<?xml version="1.0" encoding="UTF-8"?>

<plist version="1.0">
<array>
 <dict>
 <key>_SPCommandLineArguments</key>
 <array>
 <string>/usr/sbin/system_profiler</string>
 <string>-nospawn</string>
 <string>-xml</string>
 <string>SPCameraDataType</string>
 <string>-detailLevel</string>
 <string>full</string>
 </array>
 <key>_SPCompletionInterval</key>
 <real>1.1997909545898438</real>
 <key>_SPResponseTime</key>
 <real>1.2810090780258179</real>
 <key>_dataType</key>
 <string>SPCameraDataType</string>
 <key>_detailLevel</key>
 <integer>-1</integer>
 <key>_items</key>
 <array>
 <dict>
 <key>_name</key>
 <string>USB Camera</string>
 <key>spcamera_model-id</key>
 <string>UVC Camera VendorID_3141 ProductID_25453</string>
 <key>spcamera_unique-id</key>
 <string>0x11000000c45636d</string>
 </dict>
 <dict>
 <key>_name</key>
 <string>FaceTime HD Camera</string>
 <key>spcamera_model-id</key>
 <string>FaceTime HD Camera</string>
 <key>spcamera_unique-id</key>
 <string>EAB7A68F-EC2B-4487-AADF-D8A91C1CB782</string>
 </dict>
 </array>
 <key>_parentDataType</key>
 <string>SPHardwareDataType</string>
 <key>_properties</key>
 <dict>
 <key>_name</key>
 <dict>
 <key>_isColumn</key>
 <string>NO</string>
 <key>_isOutlineColumn</key>
 <string>NO</string>
 <key>_order</key>
 <string>0</string>
 </dict>
 <key>spcamera</key>
 <dict>
 <key>_order</key>
 <string>10</string>
 </dict>
 <key>spcamera_model-id</key>
 <dict>
 <key>_order</key>
 <string>30</string>
 </dict>
 <key>spcamera_unique-id</key>
 <dict>
 <key>_order</key>
 <string>40</string>
 </dict>
 <key>volumes</key>
 <dict>
 <key>_detailLevel</key>
 <string>0</string>
 </dict>
 </dict>
 <key>_timeStamp</key>
 <date>2024-11-29T21:57:28Z</date>
 <key>_versionInfo</key>
 <dict>
 <key>com.apple.SystemProfiler.SPCameraReporter</key>
 <string>1.2.0</string>
 </dict>
 </dict>
</array>
</plist>


As you can see, I have a couple of video input devices :
USB Camera&FaceTime HD Camera

The problem is that when I use
cap = cv2.VideoCapture(0), it uses theFaceTime HD Camera.

Can we match the camera index in OpenCV with the camera names ?


P.S. I tried
ffmpeg, but it returned similar result :



ioreg | grep -i camresult :



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How to dump ALL metadata from a media file, including cover image title ? [closed]
9 avril, par UnidealI have an MP3 song :


# ffprobe -hide_banner -i filename.mp3
Input #0, mp3, from 'filename.mp3':
 Metadata:
 composer : Music Author
 title : Song Name
 artist : Singer
 encoder : Lavf61.7.100
 genre : Rock
 date : 2025
 Duration: 00:03:14.04, start: 0.023021, bitrate: 208 kb/s
 Stream #0:0: Audio: mp3 (mp3float), 48000 Hz, stereo, fltp, 192 kb/s
 Metadata:
 encoder : Lavc61.19
 Stream #0:1: Video: png, rgb24(pc, gbr/unknown/unknown), 600x600 [SAR 1:1 DAR 1:1], 90k tbr, 90k tbn (attached pic)
 Metadata:
 title : Cover
 comment : Cover (front)


The task is to save its metadata to a text file and restore from that file later. Both goals should be accomplished with ffmpeg.


The simpliest method is to run :


# ffmpeg -i filename.mp3 -f ffmetadata metadata.txt


After that,
metadata.txtcontains :

;FFMETADATA1
composer=Music Author
title=Song Name
artist=Singer
date=2025
genre=Rock
encoder=Lavf61.7.100


I got global metadata only, but stream-specific info (cover image title and comment in my case) are missing.


Google suggested a more complex form of the command above to extract all metadata fields without any exclusions :


# ffmpeg -y -i filename.mp3 -c copy -map_metadata 0 -map_metadata:s:v 0:s:v -map_metadata:s:a 0:s:a -f ffmetadata metadata.txt


But the output is exactly the same :


;FFMETADATA1
composer=Music Author
title=Song Name
artist=Singer
date=2025
genre=Rock
encoder=Lavf61.7.100


Again, no info about the attached image.


Please explain what am I doing wrong.


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