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MediaSPIP Simple : futur thème graphique par défaut ?
26 septembre 2013, par
Mis à jour : Octobre 2013
Langue : français
Type : Video
Autres articles (33)
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Gestion générale des documents
13 mai 2011, parMédiaSPIP ne modifie jamais le document original mis en ligne.
Pour chaque document mis en ligne il effectue deux opérations successives : la création d’une version supplémentaire qui peut être facilement consultée en ligne tout en laissant l’original téléchargeable dans le cas où le document original ne peut être lu dans un navigateur Internet ; la récupération des métadonnées du document original pour illustrer textuellement le fichier ;
Les tableaux ci-dessous expliquent ce que peut faire MédiaSPIP (...) -
Des sites réalisés avec MediaSPIP
2 mai 2011, parCette page présente quelques-uns des sites fonctionnant sous MediaSPIP.
Vous pouvez bien entendu ajouter le votre grâce au formulaire en bas de page. -
HTML5 audio and video support
13 avril 2011, parMediaSPIP uses HTML5 video and audio tags to play multimedia files, taking advantage of the latest W3C innovations supported by modern browsers.
The MediaSPIP player used has been created specifically for MediaSPIP and can be easily adapted to fit in with a specific theme.
For older browsers the Flowplayer flash fallback is used.
MediaSPIP allows for media playback on major mobile platforms with the above (...)
Sur d’autres sites (5286)
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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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Adding album cover art to FLAC audio files using `ffmpeg`
27 décembre 2022, par user5395338I have ripped files from an audio CD I just bought. I ripped using the
Musicapp on my Macbook Pro, Catalina 10.15.6 - output format was.wavas there was no option forFLAC. My plan was to change format usingffmpeg:

% ffmpeg -v
ffmpeg version 4.4 Copyright (c) 2000-2021 the FFmpeg developers


Except for the "album cover artwork" addition, the
.wav-to-.flacconversion implemented in the shortbashscript below seems to have worked as expected :

#!/bin/bash
for file in *.wav
do
echo $file 
ffmpeg -loglevel quiet -i "$file" -ar 48000 -c:a flac -disposition:v AnotherLand.png -vsync 0 -c:v png "${file/%.wav/.flac}"
done


A script very similar to this one worked some time ago on a series of
FLAC-to-FLACconversions I had to do to reduce the bit depth. However, in that case, the originalFLACfiles already had the artwork embedded. Since this script produced usable audio files, I decided that I would try adding the artwork with a secondffmpegcommand.

I did some research, which informed me that there have been issues with
ffmpeg(1, 2, 3, 4) on adding album artwork toFLACfiles.

I have tried several commands given in the references above, but still have not found a way to add album artwork to my
FLACfiles. The following command was a highly upvoted answer, which I felt would work, but didn't :

% ffmpeg -i "01 Grave Walker.flac" -i ./AnotherLand.png -map 0:0 -map 1:0 -codec copy -id3v2_version 3 -metadata:s:v title="Album cover" -metadata:s:v comment="Cover (front)" output.flac

...


Input #0, flac, from '01 Grave Walker.flac':
 Metadata:
 encoder : Lavf58.76.100
 Duration: 00:06:59.93, start: 0.000000, bitrate: 746 kb/s
 Stream #0:0: Audio: flac, 48000 Hz, stereo, s16
Input #1, png_pipe, from './AnotherLand.png':
 Duration: N/A, bitrate: N/A
 Stream #1:0: Video: png, rgba(pc), 522x522, 25 fps, 25 tbr, 25 tbn, 25 tbc
File 'output.flac' already exists. Overwrite? [y/N] y
[flac @ 0x7fb4d701e800] Video stream #1 is not an attached picture. Ignoring
Output #0, flac, to 'output.flac':
 Metadata:
 encoder : Lavf58.76.100
 Stream #0:0: Audio: flac, 48000 Hz, stereo, s16
 Stream #0:1: Video: png, rgba(pc), 522x522, q=2-31, 25 fps, 25 tbr, 25 tbn, 25 tbc
 Metadata:
 title : Album cover
 comment : Cover (front)
Stream mapping:
 Stream #0:0 -> #0:0 (copy)
 Stream #1:0 -> #0:1 (copy)

...



I don't understand the error message :
Video stream #1 is not an attached picture.It seems to imply that that the artwork is "attached" (embedded ???) in the input file, but as I've specified the artwork is a separate file, this makes no sense to me.

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