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Autres articles (63)
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La file d’attente de SPIPmotion
28 novembre 2010, parUne file d’attente stockée dans la base de donnée
Lors de son installation, SPIPmotion crée une nouvelle table dans la base de donnée intitulée spip_spipmotion_attentes.
Cette nouvelle table est constituée des champs suivants : id_spipmotion_attente, l’identifiant numérique unique de la tâche à traiter ; id_document, l’identifiant numérique du document original à encoder ; id_objet l’identifiant unique de l’objet auquel le document encodé devra être attaché automatiquement ; objet, le type d’objet auquel (...) -
Websites made with MediaSPIP
2 mai 2011, parThis page lists some websites based on MediaSPIP.
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Configuration spécifique d’Apache
4 février 2011, parModules spécifiques
Pour la configuration d’Apache, il est conseillé d’activer certains modules non spécifiques à MediaSPIP, mais permettant d’améliorer les performances : mod_deflate et mod_headers pour compresser automatiquement via Apache les pages. Cf ce tutoriel ; mode_expires pour gérer correctement l’expiration des hits. Cf ce tutoriel ;
Il est également conseillé d’ajouter la prise en charge par apache du mime-type pour les fichiers WebM comme indiqué dans ce tutoriel.
Création d’un (...)
Sur d’autres sites (6324)
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Giving Thanks For VP8
25 novembre 2010, par Multimedia Mike — VP8It’s the Thanksgiving holiday here in the United States. I guess that’s as good a reason as any to release a first cut of my VP8 encoder. In order to remind people that they shouldn’t expect phenomenal quality from it — and to discourage inexperienced people from trying to create useful videos with it — I have hardcoded the quantizers to their maximum settings. For those not skilled in the art, this is the setting that yields maximum compression and worst quality. When compressing the Big Buck Bunny logo image, the resulting file is only 2839 bytes but observe the reconstructed quality :
It really just looks like a particularly stormy day in the forest.
First VP8 File From An Independent Encoder
I found a happy medium on the quantizer scale and encoded the first 30 seconds of Big Buck Bunny for your inspection. I guess this makes it the first VP8/WebM file from an independent encoder (using FFmpeg’s Matroska muxer as well).Download : bbb-360p-30sec-q40.webm ( 13 MBytes)
I think the quality makes it look like it was digitized from an old VHS tape.
For fun, here’s the version with the quantizer cranked to the max : bbb-360p-30sec-q127.webm ( 1.3 MBytes)
Aside : I was going to encapsulate the video in this post using a bare HTML5 <video> tag for the benefit of the small browsing population who could view that (indeed, it works fine in Chrome). But that would be insane due to the fact that supporting browsers preload the video with no easy (read : without the help of JavaScript) method for overriding this unacceptable default.
The Code
I’m still trying to get over my fear of git. To that end, I have posted the code on Github :https://github.com/multimediamike/ffvp8enc
I still don’t like you, git. But I’m sure we’ll find some way to make this work.
Other required code changes in the basic FFmpeg tree :
- Of course, copy vp8enc.c into libavcodec/
- In libavcodec/allcodecs.c, ’
REGISTER_DECODER (VP8, vp8);’ turns into ’REGISTER_ENCDEC (VP8, vp8);’ - Add ’
OBJS-$(CONFIG_VP8_ENCODER) += vp8enc.o’ to libavcodec/Makefile
Further Work
About the limitations and work yet to do :- it’s still intra-only, no interframes (which is where a lot of compression occurs)
- no rate control or distortion optimization, obviously
- no intra 4x4 coding (that’s close to working but didn’t my little T-day deadline)
- no quantization control ; this should really be hooked up to the FFmpeg command line but I’m not sure how
- encoder writes into a static-sized, 1/2 MB memory buffer ; this can overflow
- code is a mess (what did you expect at this stage of the game ?)
- lots and lots of other things, surely
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Evolution #3795 (Nouveau) : Ajouter un bouton Enregistrer en haut du formulaire editer_document
15 juin 2016, par b bDans la boite de dialogue Modifier un document, serait-il possible
d’ajouter un bouton Enregistrer aussi en haut vu que celui du bas on ne
le voit pas forcément à l’écran (le mien n’est pas assez haut pour ça) ?Je me fais avoir régulièrement en cliquant sur la fenêtre sans avoir
enregistré et ça m’énerve quand je me suis pris le chou à écrire en
trois langues.http://comments.gmane.org/gmane.comp.web.spip.user/198433
Peut-être n’afficher ce bouton supplémentaire que lorsque le formulaire est affiché dans une modale. À voir.
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FFMPEG not enough data (x y), trying to decode anyway
7 juin 2016, par Forest J. HandfordI’m trying to make videos of Direct3D games using a C# app. For non-Direct3D games I stream images from Graphics.CopyFromScreen which works. When I copy the screen from Direct3D and stream it to FFMPEG I get :
[bmp @ 00000276b0b9c280] not enough data (5070 < 129654), trying to
decode anywayAn MP4 file is created, but it is always 0 bytes.
To get screenshots from Direct3D, I am using Justin Stenning’s Direct3DHook. This produces images MUCH bigger than when I get images from Graphics.CopyFromScreen (8 MB vs 136 KB). I’ve tried increasing the buffer (-bufsize) but the number on the left of the error is not impacted.
I’ve tried resizing the image to 1/6th the original. That reduces the number on the right, but does not eliminate it. Even when the number on the right is close to what I have for Graphics.CopyFromScreen I get an error. Here is a sample of the current code :
using System;
using System.Diagnostics;
using System.Threading;
using System.Drawing;
using Capture.Hook;
using Capture.Interface;
using Capture;
using System.IO;
namespace GameRecord
{
public class Video
{
private const int VID_FRAME_FPS = 8;
private const int SIZE_MODIFIER = 6;
private const double FRAMES_PER_MS = VID_FRAME_FPS * 0.001;
private const int SLEEP_INTERVAL = 2;
private const int CONSTANT_RATE_FACTOR = 18; // Lower crf = Higher Quality https://trac.ffmpeg.org/wiki/Encode/H.264
private Image image;
private Capture captureScreen;
private int processId = 0;
private Process process;
private CaptureProcess captureProcess;
private Process launchingFFMPEG;
private string arg;
private int frame = 0;
private Size? resize = null;
/// <summary>
/// Generates the Videos by gathering frames and processing via FFMPEG.
/// </summary>
public void RecordScreenTillGameEnd(string exe, OutputDirectory outputDirectory, CustomMessageBox alertBox, Thread workerThread)
{
AttachProcess(exe);
RequestD3DScreenShot();
while (image == null) ;
Logger.log.Info("Launching FFMPEG ....");
resize = new Size(image.Width / SIZE_MODIFIER, image.Height / SIZE_MODIFIER);
// H.264 can let us do 8 FPS in high res . . . but must be licensed for commercial use.
arg = "-f image2pipe -framerate " + VID_FRAME_FPS + " -i pipe:.bmp -pix_fmt yuv420p -crf " +
CONSTANT_RATE_FACTOR + " -preset ultrafast -s " + resize.Value.Width + "x" +
resize.Value.Height + " -vcodec libx264 -bufsize 30000k -y \"" +
outputDirectory.pathToVideo + "\"";
launchingFFMPEG = new Process
{
StartInfo = new ProcessStartInfo
{
FileName = "ffmpeg",
Arguments = arg,
UseShellExecute = false,
CreateNoWindow = true,
RedirectStandardInput = true,
RedirectStandardError = true
}
};
launchingFFMPEG.Start();
Stopwatch stopWatch = Stopwatch.StartNew(); //creates and start the instance of Stopwatch
do
{
Thread.Sleep(SLEEP_INTERVAL);
} while (workerThread.IsAlive);
Logger.log.Info("Total frames: " + frame + " Expected frames: " + (ExpectedFrames(stopWatch.ElapsedMilliseconds) - 1));
launchingFFMPEG.StandardInput.Close();
#if DEBUG
string line;
while ((line = launchingFFMPEG.StandardError.ReadLine()) != null)
{
Logger.log.Debug(line);
}
#endif
launchingFFMPEG.Close();
alertBox.Show();
}
void RequestD3DScreenShot()
{
captureProcess.CaptureInterface.BeginGetScreenshot(new Rectangle(0, 0, 0, 0), new TimeSpan(0, 0, 2), Callback, resize, (ImageFormat)Enum.Parse(typeof(ImageFormat), "Bitmap"));
}
private void AttachProcess(string exe)
{
Thread.Sleep(300);
Process[] processes = Process.GetProcessesByName(Path.GetFileNameWithoutExtension(exe));
foreach (Process currProcess in processes)
{
// Simply attach to the first one found.
// If the process doesn't have a mainwindowhandle yet, skip it (we need to be able to get the hwnd to set foreground etc)
if (currProcess.MainWindowHandle == IntPtr.Zero)
{
continue;
}
// Skip if the process is already hooked (and we want to hook multiple applications)
if (HookManager.IsHooked(currProcess.Id))
{
continue;
}
Direct3DVersion direct3DVersion = Direct3DVersion.AutoDetect;
CaptureConfig cc = new CaptureConfig()
{
Direct3DVersion = direct3DVersion,
ShowOverlay = false
};
processId = currProcess.Id;
process = currProcess;
var captureInterface = new CaptureInterface();
captureInterface.RemoteMessage += new MessageReceivedEvent(CaptureInterface_RemoteMessage);
captureProcess = new CaptureProcess(process, cc, captureInterface);
break;
}
Thread.Sleep(10);
if (captureProcess == null)
{
ShowUser.Exception("No executable found matching: '" + exe + "'");
}
}
/// <summary>
/// The callback for when the screenshot has been taken
/// </summary>
///
///
///
void Callback(IAsyncResult result)
{
using (Screenshot screenshot = captureProcess.CaptureInterface.EndGetScreenshot(result))
if (screenshot != null && screenshot.Data != null && arg != null)
{
if (image != null)
{
image.Dispose();
}
image = screenshot.ToBitmap();
// image.Save("D3DImageTest.bmp");
image.Save(launchingFFMPEG.StandardInput.BaseStream, System.Drawing.Imaging.ImageFormat.Bmp);
launchingFFMPEG.StandardInput.Flush();
frame++;
}
if (frame < 5)
{
Thread t = new Thread(new ThreadStart(RequestD3DScreenShot));
t.Start();
}
else
{
Logger.log.Info("Done getting shots from D3D.");
}
}
/// <summary>
/// Display messages from the target process
/// </summary>
///
private void CaptureInterface_RemoteMessage(MessageReceivedEventArgs message)
{
Logger.log.Info(message);
}
}
}When I search the internet for the error all I get is the FFMPEG source code, which has not proven to be illuminating. I have been able to save the image directly to disk, which makes me feel like it is not an issue with disposing the data. I have also tried only grabbing one frame, but that produces the same error, which suggests to me it is not a threading issue.
Here is the full sample of stderr :
2016-06-02 18:29:38,046 === ffmpeg version N-79143-g8ff0f6a Copyright (c) 2000-2016 the FFmpeg developers
2016-06-02 18:29:38,047 === built with gcc 5.3.0 (GCC)
2016-06-02 18:29:38,048 === configuration: --enable-gpl
--enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmfx --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib
2016-06-02 18:29:38,062 === libavutil 55. 19.100 / 55. 19.100
2016-06-02 18:29:38,063 === libavcodec 57. 30.100 / 57. 30.100
2016-06-02 18:29:38,064 === libavformat 57. 29.101 / 57. 29.101
2016-06-02 18:29:38,064 === libavdevice 57. 0.101 / 57. 0.101
2016-06-02 18:29:38,065 === libavfilter 6. 40.102 / 6. 40.102
2016-06-02 18:29:38,066 === libswscale 4. 0.100 / 4. 0.100
2016-06-02 18:29:38,067 === libswresample 2. 0.101 / 2. 0.101
2016-06-02 18:29:38,068 === libpostproc 54. 0.100 / 54. 0.100
2016-06-02 18:29:38,068 === [bmp @ 000002cd7e5cc280] not enough data (13070 < 8294454), trying to decode anyway
2016-06-02 18:29:38,069 === [bmp @ 000002cd7e5cc280] not enough data (13016 < 8294400)
2016-06-02 18:29:38,069 === Input #0, image2pipe, from 'pipe:.bmp':
2016-06-02 18:29:38,262 === Duration: N/A, bitrate: N/A
2016-06-02 18:29:38,262 === Stream #0:0: Video: bmp, bgra, 1920x1080, 8 tbr, 8 tbn, 8 tbc
2016-06-02 18:29:38,263 === [libx264 @ 000002cd7e5d59a0] VBV bufsize set but maxrate unspecified, ignored
2016-06-02 18:29:38,264 === [libx264 @ 000002cd7e5d59a0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
2016-06-02 18:29:38,265 === [libx264 @ 000002cd7e5d59a0] profile Constrained Baseline, level 1.1
2016-06-02 18:29:38,266 === [libx264 @ 000002cd7e5d59a0] 264 - core 148 r2665 a01e339 - H.264/MPEG-4 AVC codec - Copyleft 2003-2016 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=8 scenecut=0 intra_refresh=0 rc=crf mbtree=0 crf=18.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=0
2016-06-02 18:29:38,463 === Output #0, mp4, to 'C:\Users\fores\AppData\Roaming\Affectiva\n_Artifacts_20160602_182857\GameplayVidOut.mp4':
2016-06-02 18:29:38,464 === Metadata:
2016-06-02 18:29:38,465 === encoder : Lavf57.29.101
2016-06-02 18:29:38,469 === Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 320x180, q=-1--1, 8 fps, 16384 tbn, 8 tbc
2016-06-02 18:29:38,470 === Metadata:
2016-06-02 18:29:38,472 === encoder : Lavc57.30.100 libx264
2016-06-02 18:29:38,474 === Side data:
2016-06-02 18:29:38,475 === cpb: bitrate max/min/avg: 0/0/0 buffer size: 30000000 vbv_delay: -1
2016-06-02 18:29:38,476 === Stream mapping:
2016-06-02 18:29:38,477 === Stream #0:0 -> #0:0 (bmp (native) -> h264 (libx264))
2016-06-02 18:29:38,480 === [bmp @ 000002cd7e5cc9a0] not enough data (13070 < 8294454), trying to decode anyway
2016-06-02 18:29:38,662 === [bmp @ 000002cd7e5cc9a0] not enough data (13016 < 8294400)
2016-06-02 18:29:38,662 === Error while decoding stream #0:0: Invalid data found when processing input
2016-06-02 18:29:38,663 === frame= 0 fps=0.0 q=0.0 Lsize= 0kB time=00:00:00.00 bitrate=N/A speed= 0x
2016-06-02 18:29:38,663 === video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
2016-06-02 18:29:38,664 === Conversion failed!In memory, the current image is 320 pixels wide and 180 pixels long. The pixel format is Format32bppRgb. The horizontal and vertical resolutions seem odd, they are both 96.01199. When filed to disk here is ffprobe output for the file :
ffprobe version N-79143-g8ff0f6a Copyright (c) 2007-2016 the FFmpeg developers
built with gcc 5.3.0 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmfx --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib
libavutil 55. 19.100 / 55. 19.100
libavcodec 57. 30.100 / 57. 30.100
libavformat 57. 29.101 / 57. 29.101
libavdevice 57. 0.101 / 57. 0.101
libavfilter 6. 40.102 / 6. 40.102
libswscale 4. 0.100 / 4. 0.100
libswresample 2. 0.101 / 2. 0.101
libpostproc 54. 0.100 / 54. 0.100
Input #0, png_pipe, from 'C:\Users\fores\git\game-playtest-tool\GamePlayTest\bin\x64\Debug\D3DFromCapture.bmp':
Duration: N/A, bitrate: N/A
Stream #0:0: Video: png, rgba(pc), 1920x1080 [SAR 3779:3779 DAR 16:9], 25 tbr, 25 tbn, 25 tbcHere is a PNG version of an example screenshot from the current code (playing Portal 2) :
Any ideas would be greatly appreciated. My current workaround is to save the files to the HDD and compile the video after gameplay, but it’s a far less performant option. Thank you !
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