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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
Autres articles (72)
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Amélioration de la version de base
13 septembre 2013Jolie sélection multiple
Le plugin Chosen permet d’améliorer l’ergonomie des champs de sélection multiple. Voir les deux images suivantes pour comparer.
Il suffit pour cela d’activer le plugin Chosen (Configuration générale du site > Gestion des plugins), puis de configurer le plugin (Les squelettes > Chosen) en activant l’utilisation de Chosen dans le site public et en spécifiant les éléments de formulaires à améliorer, par exemple select[multiple] pour les listes à sélection multiple (...) -
Le profil des utilisateurs
12 avril 2011, parChaque utilisateur dispose d’une page de profil lui permettant de modifier ses informations personnelle. Dans le menu de haut de page par défaut, un élément de menu est automatiquement créé à l’initialisation de MediaSPIP, visible uniquement si le visiteur est identifié sur le site.
L’utilisateur a accès à la modification de profil depuis sa page auteur, un lien dans la navigation "Modifier votre profil" est (...) -
Configurer la prise en compte des langues
15 novembre 2010, parAccéder à la configuration et ajouter des langues prises en compte
Afin de configurer la prise en compte de nouvelles langues, il est nécessaire de se rendre dans la partie "Administrer" du site.
De là, dans le menu de navigation, vous pouvez accéder à une partie "Gestion des langues" permettant d’activer la prise en compte de nouvelles langues.
Chaque nouvelle langue ajoutée reste désactivable tant qu’aucun objet n’est créé dans cette langue. Dans ce cas, elle devient grisée dans la configuration et (...)
Sur d’autres sites (8949)
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Create drawbox with ffmpeg between specific seconds (without reencoding whole video - faster)
31 mars 2022, par protterMy plan was to put a transparent red box behind a video. This box should only be present from second 1-45.
But if the videos are 3 hours long, the process takes a long time although it only has to process 45 seconds.


My first attempt takes too long :


ffmpeg -i %1 -vf drawbox=0:9*ih/10:iw:ih/10:t=fill:color=red@0.5:enable='between(t,1,45)' "%~dp0transpred\%~n1%~x1

Then i tried splitting the video into two parts. put the box on the first video, and then put the two back together again.


ffmpeg -ss 00:00:00.0000 -i %1 -to 00:00:45.0000 -vf drawbox=0:9*ih/10:iw:ih/10:t=fill:color=red@0.5:enable='between(t,1,45)' "%~dp0transpred\%~n1A%~x1"

FFMpeg -ss 00:00:45.0000 -i %1 -c:v copy -c:a copy -avoid_negative_ts make_zero "%~dp0transpred\%~n1B%~x1"

But i don't even have to try to put these two together, because they are not separated exactly at the second. I have read that this is due to "timestamps" and the different video and audio streams.


Now I'm trying an approach to create a stream with the bar, and then overlay it with the finished video. I haven't quite managed that yet, and I don't know if it's faster.
Shortening the video is very fast.


EDIT (Added as a replacement for the comment later)


Thanks for your help I have almost done it with a slightly different approach. Unfortunately, the second part now always has no sound. No matter if I put A and B (B no sound) or B and A (A no sound) together.


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- First split with mkvmerge so i have no worrys about the keyframes and get the exact time

mkvmerge --split timestamps:00:00:45.100 A.MKV -o splitmkm.mkv - Then add the Bar (Black because of easier testing) :

ffmpeg -i splitmkm-001.mkv -vf drawbox=0:9*ih/10:iw:ih/10:t=fill BAR1.MKV - Merge (mkvmerge ends with error) :

ffmpeg -safe 0 -f concat -i list.txt -c copy output1.mkv








EDIT (Answer to kesh)


This was the error
Again, audio codec config's must match across all your concat files. Thedrawboxchanged the audio Codec from AC-3 to Vorbis.

the procedure is now :


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mkvtoolnix\mkvmerge --split timestamps:00:00:05.100 %1 -o A_splitmkm.mkvwith mkvmerge i have an exact split at the time, and i don't have to learn about keyframes.ffmpeg -i A_splitmkm-001.mkv -vf drawbox=0:9*ih/10:iw:ih/10:t=fill:color=red A_BARmkm.MKVcreate the Barffmpeg -i A_BARmkm.MKV -i A_splitmkm-001.mkv -map 0:v -map 1 -map -1:v -c copy A_BARwithAudio.mkvredo the step with the changed audio from drawboxffmpeg -safe 0 -f concat -i list.txt -map 0 -c copy A_output1.mkvmerge










Now everything works.
Thanks alot !


- First split with mkvmerge so i have no worrys about the keyframes and get the exact time

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CUDA_ERORR_INVALID_CONTEXT
15 août 2021, par Meme MachineI am making a desktop sharing application based off of these repositories from NVIDIA.


https://github.com/NVIDIA/video-sdk-samples/tree/master/nvEncDXGIOutputDuplicationSample


https://github.com/NVIDIA/video-sdk-samples/blob/master/Samples/AppDecode/AppDecD3D/


https://github.com/NVIDIA/video-sdk-samples/tree/master/Samples/AppDecode/AppDecMem


I intend to have a setup function that is called once when Remote Desktop is selected, and then a second function that actually displays the received frames which is called when a frame is received


The below functions are nearly identical to the main() and NvD3D() functions found in AppDecD3D and AppDecMem repositories


CUcontext cuContext = NULL; // maybe it has to do with this variable?

int setup()
{
 char szInFilePath[256] = "C:\\Users\\Admin\\Desktop\\test.h264";
 int iGpu = 0;
 int iD3d = 0;
 try
 {
 //ParseCommandLine(argc, argv, szInFilePath, NULL, iGpu, NULL, &iD3d);
 CheckInputFile(szInFilePath);

 ck(cuInit(0));
 int nGpu = 0;
 ck(cuDeviceGetCount(&nGpu));
 if (iGpu < 0 || iGpu >= nGpu)
 {
 std::ostringstream err;
 err << "GPU ordinal out of range. Should be within [" << 0 << ", " << nGpu - 1 << "]" << std::endl;
 throw std::invalid_argument(err.str());
 }
 CUdevice cuDevice = 0;
 ck(cuDeviceGet(&cuDevice, iGpu));
 char szDeviceName[80];
 ck(cuDeviceGetName(szDeviceName, sizeof(szDeviceName), cuDevice));
 std::cout << "GPU in use: " << szDeviceName << std::endl;

 ck(cuCtxCreate(&cuContext, CU_CTX_SCHED_BLOCKING_SYNC, cuDevice));
 //NvDecD3D<framepresenterd3d11>(szInFilePath);

 std::cout << "Display with D3D11." << std::endl;
 }
 catch (const std::exception& ex)
 {
 std::cout << ex.what();
 exit(1);
 }
 return 0;
}

template<class typename="std::enable_if<std::is_base_of<FramePresenterD3D," framepresentertype="framepresentertype">::value>>
int NvDecD3D(char* szInFilePath)
{
 FileDataProvider dp(szInFilePath);
 FFmpegDemuxer demuxer(&dp);
 NvDecoder dec(cuContext, demuxer.GetWidth(), demuxer.GetHeight(), true, FFmpeg2NvCodecId(demuxer.GetVideoCodec()));
 FramePresenterType presenter(cuContext, demuxer.GetWidth(), demuxer.GetHeight());
 CUdeviceptr dpFrame = 0;
 ck(cuMemAlloc(&dpFrame, demuxer.GetWidth() * demuxer.GetHeight() * 4));
 int nVideoBytes = 0, nFrameReturned = 0, nFrame = 0;
 uint8_t* pVideo = NULL, ** ppFrame;

 do
 {
 demuxer.Demux(&pVideo, &nVideoBytes);
 dec.Decode(pVideo, nVideoBytes, &ppFrame, &nFrameReturned);
 if (!nFrame && nFrameReturned)
 LOG(INFO) << dec.GetVideoInfo();

 for (int i = 0; i < nFrameReturned; i++)
 {
 if (dec.GetBitDepth() == 8)
 Nv12ToBgra32((uint8_t*)ppFrame[i], dec.GetWidth(), (uint8_t*)dpFrame, 4 * dec.GetWidth(), dec.GetWidth(), dec.GetHeight());
 else
 P016ToBgra32((uint8_t*)ppFrame[i], 2 * dec.GetWidth(), (uint8_t*)dpFrame, 4 * dec.GetWidth(), dec.GetWidth(), dec.GetHeight());
 presenter.PresentDeviceFrame((uint8_t*)dpFrame, demuxer.GetWidth() * 4);
 }
 nFrame += nFrameReturned;
 } while (nVideoBytes);
 ck(cuMemFree(dpFrame));
 std::cout << "Total frame decoded: " << nFrame << std::endl;
 return 0;
}
</class></framepresenterd3d11>

Notice the line
NvDecD3D<framepresenterd3d11>(szInFilePath);</framepresenterd3d11>? I plan to callNvDecD3D()when a frame is received. So, I commented out the call insetup()and moved it to my asio:async_read function. (see below)

void do_read_body()
 {
 readBuffer.reserve(_read_msg.ReadLength);
 _read_msg.Body = readBuffer.data();
 auto self(shared_from_this());
 asio::async_read(_socket,
 asio::buffer(_read_msg.Body, _read_msg.ReadLength),
 [this, self](std::error_code ec, std::size_t /*length*/)
 {
 if (!ec)
 {
 if (_read_msg.CmdId == 0x5)
 {
 std::cout << "Received a frame" << std::endl;

 NvDecD3D<framepresenterd3d11>(szInFilePath);
 }
 else
 {
 std::cout << std::string(_read_msg.Body, 0, _read_msg.ReadLength) << std::endl;
 }
 
 do_read_header();
 }
 else
 {
 _room.leave(shared_from_this());
 }
 });
 }
</framepresenterd3d11>

However, when I go to execute it, I get
CUDA_ERORR_INVALID_CONTEXTwhencuMemAlloc()is called. If I uncomment the call toNvDecD3D()insidesetup()and call it from there, it does not error however.

Do you have any idea what could be causing this problem ? Perhaps it is related to the ASIO.


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FFMPEG/NVDEC Fails When Under 7 Frames
13 août 2021, par Meme MachineI was looking the examples from NVIDIA's repository, specifically their Encoding and Decoding projects. I downloaded the desktop duplication project, which allows you to capture a certain number of frames from the desktop as raw h264. I also got AppDecode, which decodes and displays frames from an input file. I noticed that if I try and capture only a single frame, it fails to decode the input file.


Here is the output


C:\Users\Admin>C:\Users\Admin\source\repos\video-sdk-samples\Samples\x64.Debug\AppDecD3d -d3d 11 -i C:\Users\Admin\source\repos\video-sdk-samples\nvEncDXGIOutputDuplicationSample\x64\Debug\ddatest_0.h264
GPU in use: NVIDIA GeForce RTX 2080 Super with Max-Q Design
Display with D3D11.
[INFO ][17:59:47] Media format: raw H.264 video (h264)
Session Initialization Time: 39 ms
[INFO ][17:59:47] Video Input Information
 Codec : AVC/H.264
 Frame rate : 30000/1000 = 30 fps
 Sequence : Progressive
 Coded size : [1920, 1088]
 Display area : [0, 0, 1920, 1080]
 Chroma : YUV 420
 Bit depth : 8
Video Decoding Params:
 Num Surfaces : 20
 Crop : [0, 0, 0, 0]
 Resize : 1920x1088
 Deinterlace : Weave

Total frame decoded: 7
Session Deinitialization Time: 10 ms

C:\Users\Admin>C:\Users\Admin\source\repos\video-sdk-samples\Samples\x64.Debug\AppDecD3d -d3d 11 -i C:\Users\Admin\source\repos\video-sdk-samples\nvEncDXGIOutputDuplicationSample\x64\Debug\ddatest_0.h264
GPU in use: NVIDIA GeForce RTX 2080 Super with Max-Q Design
Display with D3D11.
[INFO ][17:59:54] Media format: raw H.264 video (h264)
[h264 @ 0000023B8AB5C3A0] decoding for stream 0 failed
Session Initialization Time: 42 ms
[INFO ][17:59:54] Video Input Information
 Codec : AVC/H.264
 Frame rate : 30000/1000 = 30 fps
 Sequence : Progressive
 Coded size : [1920, 1088]
 Display area : [0, 0, 1920, 1080]
 Chroma : YUV 420
 Bit depth : 8
Video Decoding Params:
 Num Surfaces : 20
 Crop : [0, 0, 0, 0]
 Resize : 1920x1088
 Deinterlace : Weave

Total frame decoded: 6
Session Deinitialization Time: 10 ms


I started from 10 frames and counted down to 6 where it eventually failed. It is important for me to know why this happens, because I plan to implement this decoder into my project, and will be feeding it single frames from a stream.


Oh, and also I noticed the coded size is 1088 by 1920 instead of 1080 according to the output log. Not sure why that is occurring or if it is relevant


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