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Médias (1)
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Carte de Schillerkiez
13 mai 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Texte
Autres articles (45)
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Pour fonctionner ce plugin nécessite que d’autres plugins soient installés : CFG Saisies SPIP Bonux Diogène swfupload jqueryui
D’autres plugins peuvent être utilisés en complément afin d’améliorer ses capacités : Ancres douces Légendes photo_infos spipmotion (...) -
Librairies et logiciels spécifiques aux médias
10 décembre 2010, parPour un fonctionnement correct et optimal, plusieurs choses sont à prendre en considération.
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Sur d’autres sites (4907)
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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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How can I remove every nth frame from raw video using ffmpeg ?
15 juin 2024, par DaveB44Question moved to SuperUser, please reply there


I have many cine films that have been digitally converted. They have been converted as a 25 fps with 2 frames in every 23 duplicated. I need to remove the duplicated frames using a bitstream filter so there is no decoding/encoding.


After removing the frames I will change to the original cine frame rate of 18 fps. I will then change the frame rate to 25 fps using duplicated frames. I don't want to interpolate as I want to preserve the jerky format of the cine. Finally I will video editing software that will do the final encoding.


All the additional steps will cause several stages of decoding/encoding, that I need to avoid.


First I used a combination of the answers to FFmpeg remove video frames at specific intervals and FFmpeg remove every 6th frame starting from the 3rd frame, on an mp4 file to check it works. I modified it to remove every 4th and 17th frame in 25.


ffmpeg -loglevel warning -i cine.mp4 -an -vf "select='if((mod(n-4,25)),(mod(n-17,25)))',setpts='N/FRAME_RATE/TB'" cine-23.mp4


This works fine, but I end up with a file a quarter the size.


I now used Gyan's answer in Using ffmpeg to change framerate to extract the raw bitstream.


ffmpeg -loglevel warning -i cine.mp4 -c copy -f h264 cine.h264


This created the h264 file as expected, surprisingly it was 16 kB smaller than the original (67 GB file size).


I then modified the code to use the .h264 file.


ffmpeg -loglevel warning -i cine.h264 -vf "select='if((mod(n-4,25)),(mod(n-17,25)))',setpts='N/FRAME_RATE/TB'" cine-23.h264


This gave the following error, but created the cine-23.h264 file although it was the same size as cine-23.mp4 in the test above


[h264 @ 00000245ec0bfb80] non-existing SPS 0 referenced in buffering period
 Last message repeated 1 times


I then checked the ffmpeg bitstream filter documentation and found the bitstream filter setts. I changed my code to the following.


ffmpeg -loglevel warning -i cine.h264 -bsf:v "select='if((mod(n-4,25)),(mod(n-17,25)))',setts=pts='N/FRAME_RATE/TB'" cine-23.h264


Which resulted in the following error.


[vost#0:0/libx264 @ 000002916cf173c0] Error parsing bitstream filter sequence 'select='if((mod(n-4,25)),(mod(n-17,25)))',setts=pts='N/FRAME_RATE/TB'': Bitstream filter not found
Error opening output file cine-23.h264.
Error opening output files: Bitstream filter not found


I'm assuming the error is because setts does not support select. Is there another way to achieve what I am looking for ?


I could use mpdecimate but as that has to compare each frame it is much slower than defining it only needs to delete frames 4 and 17 in every second.


This is the output of ffprobe on my original file.


ffprobe version 2023-11-28-git-47e214245b-full_build-www.gyan.dev Copyright (c) 2007-2023 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-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libaribcaption --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-libjxl --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libharfbuzz --enable-liblensfun --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-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-libcodec2 --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 58. 32.100 / 58. 32.100
 libavcodec 60. 35.100 / 60. 35.100
 libavformat 60. 18.100 / 60. 18.100
 libavdevice 60. 4.100 / 60. 4.100
 libavfilter 9. 14.100 / 9. 14.100
 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 'cine.mp4':
 Metadata:
 major_brand : mp42
 minor_version : 19529864
 compatible_brands: mp42isom
 creation_time : 2024-02-19T21:01:10.000000Z
 Duration: 00:01:00.00, start: 0.000000, bitrate: 9245 kb/s
 Stream #0:0[0x1](eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(progressive), 720x576 [SAR 35:32 DAR 175:128], 9243 kb/s, 25 fps, 25 tbr, 25 tbn (default)
 Metadata:
 creation_time : 2024-02-19T21:01:10.000000Z
 handler_name : Video Media Handler
 vendor_id : [0][0][0][0]
 encoder : AVC Coding


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