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Rennes Emotion Map 2010-11
19 octobre 2011, par
Mis à jour : Juillet 2013
Langue : français
Type : Texte
Autres articles (33)
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Publier sur MédiaSpip
13 juin 2013Puis-je poster des contenus à partir d’une tablette Ipad ?
Oui, si votre Médiaspip installé est à la version 0.2 ou supérieure. Contacter au besoin l’administrateur de votre MédiaSpip pour le savoir -
Automated installation script of MediaSPIP
25 avril 2011, parTo overcome the difficulties mainly due to the installation of server side software dependencies, an "all-in-one" installation script written in bash was created to facilitate this step on a server with a compatible Linux distribution.
You must have access to your server via SSH and a root account to use it, which will install the dependencies. Contact your provider if you do not have that.
The documentation of the use of this installation script is available here.
The code of this (...) -
Emballe médias : à quoi cela sert ?
4 février 2011, parCe plugin vise à gérer des sites de mise en ligne de documents de tous types.
Il crée des "médias", à savoir : un "média" est un article au sens SPIP créé automatiquement lors du téléversement d’un document qu’il soit audio, vidéo, image ou textuel ; un seul document ne peut être lié à un article dit "média" ;
Sur d’autres sites (6593)
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ffmpeg : getting larger gif file after optimization [closed]
28 août 2024, par xaxaI'm trying to use
ffmpegto reduce the size of GIF images by lowering fps and color palette size. This is the command I use :

ffmpeg -i initial.gif -filter_complex "[0]fps=${fps},split[m][t];[t]palettegen=max_colors=${max_colors}[p];[m][p]paletteuse" output.gif


however, for some reason I'm getting larger files even if I do something as stupid as
fps=1,max_colors=4.

here's the initial file :



here's what I've got after the transformation :



the command was :


ffmpeg -i eglite.gif -filter_complex "[0]fps=1,split[m][t];[t]palettegen=max_colors=4[p];[m][p]paletteuse" output.gif


and the sizes I get are :


-rw-r--r-- 1 work work 15860 Aug 26 11:30 eglite.gif
-rw-r--r-- 1 work work 21395 Aug 28 21:35 output.gif


Here's my ffmpeg version :


ffmpeg version n7.0.2 Copyright (c) 2000-2024 the FFmpeg developers
built with gcc 14.2.1 (GCC) 20240805
configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-amf --enable-avisynth --enable-cuda-llvm --enable-lto --enable-fontconfig --enable-frei0r --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libdav1d --enable-libdrm --enable-libdvdnav --enable-libdvdread --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libharfbuzz --enable-libiec61883 --enable-libjack --enable-libjxl --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libplacebo --enable-libpulse --enable-librav1e --enable-librsvg --enable-librubberband --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpl --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-libzimg --enable-nvdec --enable-nvenc --enable-opencl --enable-opengl --enable-shared --enable-vapoursynth --enable-version3 --enable-vulkan
libavutil 59. 8.100 / 59. 8.100
libavcodec 61. 3.100 / 61. 3.100
libavformat 61. 1.100 / 61. 1.100
libavdevice 61. 1.100 / 61. 1.100
libavfilter 10. 1.100 / 10. 1.100
libswscale 8. 1.100 / 8. 1.100
libswresample 5. 1.100 / 5. 1.100
libpostproc 58. 1.100 / 58. 1.100


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Struggling to add subtitles to a video using FFMPEG and C#
19 mars 2024, par MattHodsonI'm trying to add subtitles to my videos, 100% with code using FFMPEG and C#.


But I'm getting the following error :




ffmpeg version 2024-02-04-git-7375a6ca7b-essentials_build-www.gyan.dev Copyright (c) 2000-2024 the FFmpeg developers
built with gcc 12.2.0 (Rev10, Built by MSYS2 project)
configuration : —enable-gpl —enable-version3 —enable-static —pkg-config=pkgconf —disable-w32threads —disable-autodetect —enable-fontconfig —enable-iconv —enable-gnutls —enable-libxml2 —enable-gmp —enable-bzlib —enable-lzma —enable-zlib —enable-libsrt —enable-libssh —enable-libzmq —enable-avisynth —enable-sdl2 —enable-libwebp —enable-libx264 —enable-libx265 —enable-libxvid —enable-libaom —enable-libopenjpeg —enable-libvpx —enable-mediafoundation —enable-libass —enable-libfreetype —enable-libfribidi —enable-libharfbuzz —enable-libvidstab —enable-libvmaf —enable-libzimg —enable-amf —enable-cuda-llvm —enable-cuvid —enable-ffnvcodec —enable-nvdec —enable-nvenc —enable-dxva2 —enable-d3d11va —enable-libvpl —enable-libgme —enable-libopenmpt —enable-libopencore-amrwb —enable-libmp3lame —enable-libtheora —enable-libvo-amrwbenc —enable-libgsm —enable-libopencore-amrnb —enable-libopus —enable-libspeex —enable-libvorbis —enable-librubberband
libavutil 58. 36.101 / 58. 36.101
libavcodec 60. 38.100 / 60. 38.100
libavformat 60. 20.100 / 60. 20.100
libavdevice 60. 4.100 / 60. 4.100
libavfilter 9. 17.100 / 9. 17.100
libswscale 7. 6.100 / 7. 6.100
libswresample 4. 13.100 / 4. 13.100
libpostproc 57. 4.100 / 57. 4.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'C :\Users\Gamer\source\repos\XXXX\bin\Debug\net8.0\ce31c8ab-4b53-44e8-9e25-d02ba5466144\output.mp4' :
Metadata :
major_brand : isom
minor_version : 512
compatible_brands : isomiso2avc1mp41
encoder : Lavf60.20.100
Duration : 00:03:18.84, start : 0.000000, bitrate : 101 kb/s
Stream #0:00x1 : Video : h264 (High) (avc1 / 0x31637661), yuv420p(progressive), 1024x1792, 26 kb/s, 1 fps, 1 tbr, 16384 tbn (default)
Metadata :
handler_name : VideoHandler
vendor_id : [0][0][0][0]
encoder : Lavc60.38.100 libx264
Stream #0:10x2 : Audio : aac (LC) (mp4a / 0x6134706D), 24000 Hz, mono, fltp, 74 kb/s (default)
Metadata :
handler_name : SoundHandler
vendor_id : [0][0][0][0]
[Parsed_subtitles_0 @ 000001a87404e3c0] Unable to parse option value "UsersGamersourcereposXXXXbinDebugnet8.0ce31c8ab-4b53-44e8-9e25-d02ba5466144output.srt" as image size
Error applying option 'original_size' to filter 'subtitles' : Invalid argument
[vost#0:0/libx264 @ 000001a874064a40] Error initializing a simple filtergraph
Error opening output file C :\Users\Gamer\source\repos\XXXX\bin\Debug\net8.0\ce31c8ab-4b53-44e8-9e25-d02ba5466144\videoWithSubtitles.mp4.
Error opening output files : Invalid argument




It seems to be something related to paths, but I have tried EVERYTHING in my knowledge to fix this, still no luck... spent the majority of the day on it, no luck... so StackOverflow here I come !


My code :


public static async Task AddSubtitlesToVideoAsync(string videoPath, string subtitlesPath, string outputPath)
 {
 if (File.Exists(videoPath) && File.Exists(subtitlesPath))
 {
 //string subtitlesPathForwardSlashes = subtitlesPath.Replace("\\", "/");
 //string ffmpegCommand = $"-i \"{videoPath}\" -filter_complex \"subtitles='{subtitlesPathForwardSlashes}'\" \"{outputPath}\"";
 //string ffmpegCommand = $"-i \"{videoPath}\" -vf subtitles={subtitlesPathForwardSlashes} \"{outputPath}\"";
 //string ffmpegCommand = $"-i \"{videoPath}\" -vf subtitles=\"{subtitlesPath}\" \"{outputPath}\"";
 string subtitlesPathEscaped = subtitlesPath.Replace("\\", "\\\\");
 string ffmpegCommand = $"-i \"{videoPath}\" -vf subtitles=\"{subtitlesPathEscaped}\" \"{outputPath}\"";


 //output -i C:\Users\Gamer\source\repos\XXXX\bin\Debug\net8.0\d745a08d-b932-47ac-a81c-45e9483590a7\output.mp4 -vf subtitles="C:/Users/Gamer/source/repos/XXXX/bin/Debug/net8.0/d745a08d-b932-47ac-a81c-45e9483590a7/generatedSubtitles.srt" C:\Users\Gamer\source\repos\XXXX\bin\Debug\net8.0\d745a08d-b932-47ac-a81c-45e9483590a7\videoWithSubtitles.mp4
 await ExecuteSubtitleCommandAsync(ffmpegCommand);
 }
 else
 {
 Console.WriteLine("Files can't be found.");
 }
 }

 public static async Task ExecuteSubtitleCommandAsync(string arguments)
 {
 string ffmpegExecutablePath = ffmpegRoot;
 var startInfo = new ProcessStartInfo(ffmpegExecutablePath, arguments)
 {
 CreateNoWindow = true,
 UseShellExecute = false,
 RedirectStandardOutput = true,
 RedirectStandardError = true
 };

 using (var process = new Process { StartInfo = startInfo })
 {
 process.EnableRaisingEvents = true; // Enable the Exited event.
 process.Exited += (sender, e) =>
 {
 Console.WriteLine($"FFmpeg process exited with code {process.ExitCode}.");
 };

 try
 {
 process.Start();
 // Asynchronously read the standard output and standard error of the process
 var outputTask = process.StandardOutput.ReadToEndAsync();
 var errorTask = process.StandardError.ReadToEndAsync();
 // Wait for both asynchronous tasks to complete
 await Task.WhenAll(outputTask, errorTask);

 var output = await outputTask;
 var error = await errorTask;

 if (!string.IsNullOrEmpty(error))
 {
 Console.WriteLine("FFmpeg error: " + error);
 }
 else
 {
 Console.WriteLine("FFmpeg process completed successfully.");
 }
 }
 catch (Exception ex)
 {
 Console.WriteLine("Error: " + ex.Message);
 }
 finally
 {
 // Wait for the process to exit if it hasn't already.
 if (!process.HasExited)
 {
 process.WaitForExit();
 }
 }
 }
 }


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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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