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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 (...) -
XMP PHP
13 mai 2011, parDixit Wikipedia, XMP signifie :
Extensible Metadata Platform ou XMP est un format de métadonnées basé sur XML utilisé dans les applications PDF, de photographie et de graphisme. Il a été lancé par Adobe Systems en avril 2001 en étant intégré à la version 5.0 d’Adobe Acrobat.
Étant basé sur XML, il gère un ensemble de tags dynamiques pour l’utilisation dans le cadre du Web sémantique.
XMP permet d’enregistrer sous forme d’un document XML des informations relatives à un fichier : titre, auteur, historique (...)
Sur d’autres sites (3629)
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Error using FFMPEG to convert each input image into H264 compiling in Visual Studio running in MevisLab
21 février 2014, par user3012914I am creating a ML Module in MevisLab Framework, I am using FFMPEG to convert each image i get into a H264 Video and save it after I get all the frames. But unfortunately I have problem allocating the output buffer size. The application crashes when I include this in my code.If I am not including it, the output file size is just 4kb. Nothing is stored in it.
I am also not very sure whether it is correct way of getting the HBitmap into the Encoder. Would be great to have your suggestions.
My Code :
BITMAPINFO bitmapInfo;
HDC hdc;
ZeroMemory(&bitmapInfo, sizeof(bitmapInfo));
BITMAPINFOHEADER &bitmapInfoHeader = bitmapInfo.bmiHeader;
bitmapInfoHeader.biSize = sizeof(bitmapInfoHeader);
bitmapInfoHeader.biWidth = _imgWidth;
bitmapInfoHeader.biHeight = _imgHeight;
bitmapInfoHeader.biPlanes = 1;
bitmapInfoHeader.biBitCount = 24;
bitmapInfoHeader.biCompression = BI_RGB;
bitmapInfoHeader.biSizeImage = ((bitmapInfoHeader.biWidth * bitmapInfoHeader.biBitCount / 8 + 3) & 0xFFFFFFFC) * bitmapInfoHeader.biHeight;
bitmapInfoHeader.biXPelsPerMeter = 10000;
bitmapInfoHeader.biYPelsPerMeter = 10000;
bitmapInfoHeader.biClrUsed = 0;
bitmapInfoHeader.biClrImportant = 0;
//RGBQUAD* Ref = new RGBQUAD[_imgWidth,_imgHeight];
HDC hdcscreen = GetDC(0);
hdc = CreateCompatibleDC(hdcscreen);
ReleaseDC(0, hdcscreen);
_hbitmap = CreateDIBSection(hdc, (BITMAPINFO*) &bitmapInfoHeader, DIB_RGB_COLORS, &_bits, NULL, NULL);To get the BitMap I use the above code. Then I allocate the Codec Context as followed
c->bit_rate = 400000;
// resolution must be a multiple of two
c->width = 1920;
c->height = 1080;
// frames per second
frame_rate = _framesPerSecondFld->getIntValue();
//AVRational rational = {1,10};
//c->time_base = (AVRational){1,25};
//c->time_base = (AVRational){1,25};
c->gop_size = 10; // emit one intra frame every ten frames
c->max_b_frames = 1;
c->keyint_min = 1; //minimum GOP size
c->time_base.num = 1; // framerate numerator
c->time_base.den = _framesPerSecondFld->getIntValue();
c->i_quant_factor = (float)0.71; // qscale factor between P and I frames
c->pix_fmt = AV_PIX_FMT_RGB32;
std::string msg;
msg.append("Context is stored");
_messageFld->setStringValue(msg.c_str());I create the Bitmap Image as followed from the input
PagedImage *inImg = getUpdatedInputImage(0);
ML_CHECK(inImg);
ImageVector imgExt = inImg->getImageExtent();
if ((imgExt.x = _imgWidth) && (imgExt.y == _imgHeight))
{
if (((imgExt.x % 4)==0) && ((imgExt.y % 4) == 0))
{
// read out input image and write output image into video
// get input image as an array
void* imgData = NULL;
SubImageBox imageBox(imgExt); // get the whole image
getTile(inImg, imageBox, MLuint8Type, &imgData);
iData = (MLuint8*)imgData;
int r = 0; int g = 0;int b = 0;
// since we have only images with
// a z-ext of 1, we can compute the c stride as follows
int cStride = _imgWidth * _imgHeight;
uint8_t offset = 0;
// pointer into the bitmap that is
// used to write images into the avi
UCHAR* dst = (UCHAR*)_bits;
for (int y = _imgHeight-1; y >= 0; y--)
{ // reversely scan the image. if y-rows of DIB are set in normal order, no compression will be available.
offset = _imgWidth * y;
for (int x = 0; x < _imgWidth; x++)
{
if (_isGreyValueImage)
{
r = iData[offset + x];
*dst++ = (UCHAR)r;
*dst++ = (UCHAR)r;
*dst++ = (UCHAR)r;
}
else
{
b = iData[offset + x]; // windows bitmap need reverse order: bgr instead of rgb
g = iData[offset + x + cStride ];
r = iData[offset + x + cStride + cStride];
*dst++ = (UCHAR)r;
*dst++ = (UCHAR)g;
*dst++ = (UCHAR)b;
}
// alpha channel in input image is ignored
}
}Then I add it to the Encoder as followed as write as H264
in_width = c->width;
in_height = c->height;
out_width = c->width;
out_height = c->height;
ibytes = avpicture_get_size(PIX_FMT_BGR32, in_width, in_height);
obytes = avpicture_get_size(PIX_FMT_YUV420P, out_width, out_height);
outbuf_size = 100000 + c->width*c->height*(32>>3); // allocate output buffer
outbuf = static_cast(malloc(outbuf_size));
if(!obytes)
{
std::string msg;
msg.append("Bytes cannot be allocated");
_messageFld->setStringValue(msg.c_str());
}
else
{
std::string msg;
msg.append("Bytes allocation done");
_messageFld->setStringValue(msg.c_str());
}
//create buffer for the output image
inbuffer = (uint8_t*)av_malloc(ibytes);
outbuffer = (uint8_t*)av_malloc(obytes);
inbuffer = (uint8_t*)dst;
//create ffmpeg frame structures. These do not allocate space for image data,
//just the pointers and other information about the image.
AVFrame* inpic = avcodec_alloc_frame();
AVFrame* outpic = avcodec_alloc_frame();
//this will set the pointers in the frame structures to the right points in
//the input and output buffers.
avpicture_fill((AVPicture*)inpic, inbuffer, PIX_FMT_BGR32, in_width, in_height);
avpicture_fill((AVPicture*)outpic, outbuffer, PIX_FMT_YUV420P, out_width, out_height);
av_image_alloc(outpic->data, outpic->linesize, c->width, c->height, c->pix_fmt, 1);
inpic->data[0] += inpic->linesize[0]*(_imgHeight-1); // flipping frame
inpic->linesize[0] = -inpic->linesize[0];
if(!inpic)
{
std::string msg;
msg.append("Image is empty");
_messageFld->setStringValue(msg.c_str());
}
else
{
std::string msg;
msg.append("Picture has allocations");
_messageFld->setStringValue(msg.c_str());
}
//create the conversion context
fooContext = sws_getContext(in_width, in_height, PIX_FMT_BGR32, out_width, out_height, PIX_FMT_YUV420P, SWS_FAST_BILINEAR, NULL, NULL, NULL);
//perform the conversion
sws_scale(fooContext, inpic->data, inpic->linesize, 0, in_height, outpic->data, outpic->linesize);
//out_size = avcodec_encode_video(c, outbuf,outbuf_size, outpic);
if(!out_size)
{
std::string msg;
msg.append("Outsize is not valid");
_messageFld->setStringValue(msg.c_str());
}
else
{
std::string msg;
msg.append("Outsize is valid");
_messageFld->setStringValue(msg.c_str());
}
fwrite(outbuf, 1, out_size, f);
if(!fwrite)
{
std::string msg;
msg.append("Frames couldnt be written");
_messageFld->setStringValue(msg.c_str());
}
else
{
std::string msg;
msg.append("Frames written to the file");
_messageFld->setStringValue(msg.c_str());
}
// for (;out_size; i++)
// {
out_size = avcodec_encode_video(c, outbuf, outbuf_size, NULL);
std::string msg;
msg.append("Writing Frames");
_messageFld->setStringValue(msg.c_str());// encode the delayed frames
_numFramesFld->setIntValue(_numFramesFld->getIntValue()+1);
fwrite(outbuf, 1, out_size, f);
// }
outbuf[0] = 0x00;
outbuf[1] = 0x00; // add sequence end code to have a real mpeg file
outbuf[2] = 0x01;
outbuf[3] = 0xb7;
fwrite(outbuf, 1, 4, f);
}Then close and clean the Image Buffer and file
ML_TRACE_IN("MovieCreator::_endRecording()")
if (_numFramesFld->getIntValue() == 0)
{
_messageFld->setStringValue("Empty movie, nothing saved.");
}
else
{
_messageFld->setStringValue("Movie written to disk.");
_numFramesFld->setIntValue(0);
if (_hbitmap)
{
DeleteObject(_hbitmap);
}
if (c != NULL)
{
av_free(outbuffer);
av_free(inpic);
av_free(outpic);
fclose(f);
avcodec_close(c); // freeing memory
free(outbuf);
av_free(c);
}
}}
I think the Main Problem is over here !!
//out_size = avcodec_encode_video(c, outbuf,outbuf_size, outpic); -
FFmpeg returning an error - What does it mean ?
19 mars 2013, par user1031947I am using FFmpeg, libmp3lame & libx264 along with the node fluent-ffmpeg module. This is my first foray into processing uploaded videos.
From node, I use the following code to process an uploaded video :
var proc = new ffmpeg({ source: src, nolog: true })
.usingPreset( "podcast" )
.withAudioCodec( "libmp3lame" )
.saveToFile( dest, function( retcode, err ){
if( err ) throw err;
...
});When I try to process a video, this fails with the following error, which I don't understand. I am hoping someone here can help point me in the right direction. Thanks !
> ffmpeg version 0.8.5-6:0.8.5-1, Copyright (c) 2000-2012 the Libav
> developers built on Jan 13 2013 12:05:48 with gcc 4.7.2
> *** THIS PROGRAM IS DEPRECATED *** This program is only provided for compatibility and will be removed in a future release. Please use
> avconv instead.
>
> Seems stream 0 codec frame rate differs from container frame rate:
> 5994.00 (5994/1) -> 29.97 (2997/100) Input #0, mov,mp4,m4a,3gp,3g2,mj2, from
> '/home/ssp/resources/tmp/32111bf4217e87c23328ec81c56c7d02':
> Metadata:
> major_brand : M4VP
> minor_version : 1
> compatible_brands: M4VPM4A mp42isom
> creation_time : 2008-08-26 17:28:47 Duration: 00:00:08.01, start: 0.000000, bitrate: 944 kb/s
> Stream #0.0(eng): Video: h264 (Constrained Baseline), yuv420p, 480x272, 815 kb/s, 29.97 fps, 29.97 tbr, 2997 tbn, 5994 tbc
> Metadata:
> creation_time : 2008-08-26 17:28:47
> Stream #0.1(eng): Audio: aac, 44100 Hz, stereo, s16, 124 kb/s
> Metadata:
> creation_time : 2008-08-26 17:28:47 [buffer @ 0xb685a0] w:480 h:272 pixfmt:yuv420p [scale @ 0xb63280] w:480 h:272 fmt:yuv420p ->
> w:320 h:176 fmt:yuv420p flags:0x4 [libx264 @ 0xb67c20] VBV maxrate
> unspecified, assuming CBR [libx264 @ 0xb67c20] using cpu capabilities:
> MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2 AVX [libx264 @ 0xb67c20]
> profile Main, level 1.3 Output #0, m4v, to
> '/home/ssp/resources/users/11/026468c8f4ea1beee0a585ebc2208137.m4v':
> Metadata:
> major_brand : M4VP
> minor_version : 1
> compatible_brands: M4VPM4A mp42isom
> creation_time : 2008-08-26 17:28:47
> encoder : Lavf53.21.1
> Stream #0.0(eng): Video: libx264, yuv420p, 320x176, q=10-51, 512 kb/s, 90k tbn, 29.97 tbc
> Metadata:
> creation_time : 2008-08-26 17:28:47
> Stream #0.1(eng): Audio: libmp3lame, 44100 Hz, 1 channels, s16, 128 kb/s
> Metadata:
> creation_time : 2008-08-26 17:28:47 Stream mapping: Stream #0.0 -> #0.0 Stream #0.1 -> #0.1 Press ctrl-c to stop encoding frame= 240 fps=154 q=11.0 Lsize= 642kB time=7.97 bitrate=
> 659.3kbits/s video:516kB audio:126kB global headers:0kB muxing overhead 0.000000% frame I:1 Avg QP:15.35 size: 9995 [libx264 @
> 0xb67c20] frame P:77 Avg QP:13.25 size: 5419 [libx264 @ 0xb67c20]
> frame B:162 Avg QP:18.31 size: 625 [libx264 @ 0xb67c20]
> consecutive B-frames: 2.5% 12.5% 30.0% 55.0% [libx264 @ 0xb67c20] mb
> I I16..4: 9.1% 0.0% 90.9% [libx264 @ 0xb67c20] mb P I16..4: 2.1%
> 0.0% 2.8% P16..4: 18.0% 29.9% 44.8% 0.0% 0.0% skip: 2.3% [libx264 @ 0xb67c20] mb B I16..4: 0.1% 0.0% 0.0% B16..8: 35.2%
> 20.2% 1.9% direct:14.5% skip:28.1% L0:26.3% L1:38.1% BI:35.6% [libx264 @ 0xb67c20] coded y,uvDC,uvAC intra: 83.7% 91.7% 84.7% inter:
> 27.7% 43.4% 13.9% [libx264 @ 0xb67c20] i16 v,h,dc,p: 20% 29% 42% 9% [libx264 @ 0xb67c20] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 17% 29% 20% 4%
> 8% 6% 9% 3% 4% [libx264 @ 0xb67c20] i8c dc,h,v,p: 60% 19% 16% 5%
> [libx264 @ 0xb67c20] Weighted P-Frames: Y:2.6% UV:0.0% [libx264 @
> 0xb67c20] ref P L0: 75.6% 13.5% 8.0% 2.8% 0.1% [libx264 @ 0xb67c20]
> ref B L0: 94.5% 5.5% [libx264 @ 0xb67c20] kb/s:528.00 -
Python SWIG bindings with SomeType ** as function argument
2 mai 2013, par vericuleI couldn't find any working Python bindings for ffmpeg, so I decided to generate one with SWIG. Generation was quick and easy (no customization, just default SWIG interface), but these a problem using some functions like
int avformat_open_input(AVFormatContext **ps, const char *filename, AVInputFormat *fmt, AVDictionary **options);from libavformat/avformat.h. Using C this can be run simply by :AVFormatContext *pFormatCtx = NULL;
int status;
status = avformat_open_input(&pFormatCtx, '/path/to/my/file.ext', NULL, NULL);In Python I try following :
>>> from ppmpeg import *
>>> av_register_all()
>>> FormatCtx = AVFormatContext()
>>> FormatCtx
>
>>> avformat_open_input(FormatCtx, '/path/to/my/file.ext', None, None)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: in method 'avformat_open_input', argument 1 of type 'AVFormatContext **'
</module></stdin>Problem is that Python do not have & equivalent. I tried to use
cpointer.iand itspointer_class(%pointer_class(AVFormatContext, new_ctx)), butnew_ctx()returns pointer and this is not I want definitely.%pointer_class(AVFormatContext *, new_ctx)is illegal and gives syntax error. I would be grateful for any help. Thanks.EDIT :
I forgot to mention I tried to use typemaps, but don't know how to write custom typemap for struct and documentation has only examples for basic types like int or float...
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