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Rennes Emotion Map 2010-11
19 octobre 2011, par
Mis à jour : Juillet 2013
Langue : français
Type : Texte
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Carte de Schillerkiez
13 mai 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Texte
Autres articles (69)
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Les autorisations surchargées par les plugins
27 avril 2010, parMediaspip core
autoriser_auteur_modifier() afin que les visiteurs soient capables de modifier leurs informations sur la page d’auteurs -
Support de tous types de médias
10 avril 2011Contrairement à beaucoup de logiciels et autres plate-formes modernes de partage de documents, MediaSPIP a l’ambition de gérer un maximum de formats de documents différents qu’ils soient de type : images (png, gif, jpg, bmp et autres...) ; audio (MP3, Ogg, Wav et autres...) ; vidéo (Avi, MP4, Ogv, mpg, mov, wmv et autres...) ; contenu textuel, code ou autres (open office, microsoft office (tableur, présentation), web (html, css), LaTeX, Google Earth) (...)
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Supporting all media types
13 avril 2011, parUnlike most software and media-sharing platforms, MediaSPIP aims to manage as many different media types as possible. The following are just a few examples from an ever-expanding list of supported formats : images : png, gif, jpg, bmp and more audio : MP3, Ogg, Wav and more video : AVI, MP4, OGV, mpg, mov, wmv and more text, code and other data : OpenOffice, Microsoft Office (Word, PowerPoint, Excel), web (html, CSS), LaTeX, Google Earth and (...)
Sur d’autres sites (11167)
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Increase Duration of a video FFMPEG C++
9 avril 2015, par Shahroz TariqI am using the code from the samples of FFmpeg which encodes a picture into a video. All I want to do is to give it a series of pictures and it gives me a video with each picture is taking one second`Code below is just taking one picture from my file system & creating video from it
AVCodec *codec;
AVCodecContext *c = NULL;
int i, ret, x, y, got_output;
FILE *f;
AVPacket pkt;
uint8_t endcode[] = { 0, 0, 1, 0xb7 };
printf("Encode video file %s\n", filename);
/* find the mpeg1 video encoder */
codec = avcodec_find_encoder((AVCodecID)codec_id);
if (!codec)
{
fprintf(stderr, "Codec not found\n");
exit(1);
}
c = avcodec_alloc_context3(codec);
if (!c)
{
fprintf(stderr, "Could not allocate video codec context\n");
exit(1);
}
/* put sample parameters */
c->bit_rate = 400000;
/* resolution must be a multiple of two */
c->width = 200;
c->height = 200;
/* frames per second */
AVRational rational;
rational.num = 1;
rational.den = 25;
c->time_base = rational;
/* emit one intra frame every ten frames
* check frame pict_type before passing frame
* to encoder, if frame->pict_type is AV_PICTURE_TYPE_I
* then gop_size is ignored and the output of encoder
* will always be I frame irrespective to gop_size
*/
c->gop_size = 10;
c->max_b_frames = 1;
c->pix_fmt = AV_PIX_FMT_YUV420P;
if (codec_id == AV_CODEC_ID_H264)
av_opt_set(c->priv_data, "preset", "slow", 0);
/* open it */
if (avcodec_open2(c, codec, NULL) < 0)
{
fprintf(stderr, "Could not open codec\n");
exit(1);
}
fopen_s(&f, filename, "wb");
if (!f)
{
fprintf(stderr, "Could not open %s\n", filename);
exit(1);
}
AVFrame *frame = OpenImage("..\\..\\..\\..\\..\\..\\1.jpg");
//frame = av_frame_alloc();
if (!frame)
{
fprintf(stderr, "Could not allocate video frame\n");
exit(1);
}
frame->format = c->pix_fmt;
frame->width = c->width;
frame->height = c->height;
/* the image can be allocated by any means and av_image_alloc() is
* just the most convenient way if av_malloc() is to be used */
int screenHeight = 200;
int screenWidth = 200;
for (i = 0; i < 25; i++)
{
av_init_packet(&pkt);
pkt.data = NULL; // packet data will be allocated by the encoder
pkt.size = 0;
fflush(stdout);
frame->pts = i;
/* encode the image */
ret = avcodec_encode_video2(c, &pkt, frame, &got_output);
if (ret < 0)
{
fprintf(stderr, "Error encoding frame\n");
exit(1);
}
if (got_output)
{
printf("Write frame %3d (size=%5d)\n", i, pkt.size);
fwrite(pkt.data, 1, pkt.size, f);
av_free_packet(&pkt);
}
}
/* get the delayed frames */
for (got_output = 1; got_output; i++)
{
fflush(stdout);
ret = avcodec_encode_video2(c, &pkt, NULL, &got_output);
if (ret < 0)
{
fprintf(stderr, "Error encoding frame\n");
exit(1);
}
if (got_output)
{
printf("Write frame %3d (size=%5d)\n", i, pkt.size);
fwrite(pkt.data, 1, pkt.size, f);
av_free_packet(&pkt);
}
}
/* add sequence end code to have a real mpeg file */
fwrite(endcode, 1, sizeof(endcode), f);
fclose(f);
avcodec_close(c);
av_free(c);
av_freep(&frame->data[0]);
av_frame_free(&frame);
printf("\n");` -
FFmpeg using Intel quicksync
3 mars 2016, par KevinAI’m trying to use FFmpeg with Intel QuickSync(qsv)
Finding the codec works, but when I go to open the codec I get a -40
I’ve traced it to :
ret = MFXVideoENCODE_GetVideoParam(q->session, &q->param) ;Below in my initialzation code :
AVCodec* m_codec = ::avcodec_find_encoder_by_name("h264_qsv");
if (!m_codec){
DBGPRINTF("Could not find encoder");
return E_INVALIDARG;
}
AVCodecContext* m_context = ::avcodec_alloc_context3(m_codec);
if (!m_context){
DBGPRINTF("Could not alloc AV context");
return E_INVALIDARG;
}
mfxIMPL impl = MFX_IMPL_AUTO;
mfxVersion ver = { { 1, 1 } };
MFXInit(impl, &ver, &m_qsvContext->session);
m_qsvContext->iopattern = MFX_IOPATTERN_IN_OPAQUE_MEMORY;
m_qsvContext->opaque_alloc = 1;
m_qsvContext->nb_opaque_surfaces = 16;
m_context->hwaccel_context = m_qsvContext;
m_context->profile = FF_PROFILE_H264_BASELINE;
AVRational fps;
AVRational sar;
fps.num = static_cast(m_targetFPS);
fps.den = 1;
sar.num = m_iHeightOut;
sar.den = m_iWidthOut;
//m_context->bit_rate = 400000;
m_context->width = m_iWidthOut;
m_context->height = m_iHeightOut;
m_context->has_b_frames = 0;
m_context->sample_aspect_ratio = sar;
m_context->time_base = fps;
m_context->gop_size = s_keyFramesMax;
m_context->pix_fmt = AV_PIX_FMT_QSV;
m_context->flags |= AV_CODEC_FLAG_QSCALE;
m_context->flags |= CODEC_FLAG_PASS1;
m_context->thread_count = 1;
m_context->codec_type = AVMEDIA_TYPE_VIDEO;
::av_opt_set(m_context->priv_data, "preset", "fast", 0);
::av_opt_set(m_context->priv_data, "look_ahead", "0", 0);
int ret = avcodec_open2(context, codec, nullptr);
if (ret < 0) {
DBGPRINTF("Could not open codec h264_qsv with code %d", ret);
return ret;
}I’m obviously missing something, but i’m not sure what. Can someone help point me in the correct direction ?
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FFMEPG error : Exactly one scaler algorithm must be chosen
28 mai 2015, par Dave_DevI am currently working on a FFMPEG project. I am trying to convert a RGB image in a YUV image using this code (I found it in the internet last night) :
void Decode::video_encode_example(const char *filename, int codec_id)
{
AVCodec *codec;
AVCodecContext *c= NULL;
int i, ret, x, y, got_output;
FILE *f;
AVFrame *frame;
AVPacket pkt;
uint8_t endcode[] = { 0, 0, 1, 0xb7 };
printf("Encode video file %s\n", filename);
/* find the mpeg1 video encoder */
codec = avcodec_find_encoder((enum AVCodecID)codec_id);
if (!codec) {
fprintf(stderr, "Codec not found\n");
exit(1);
}
c = avcodec_alloc_context3(codec);
if (!c) {
fprintf(stderr, "Could not allocate video codec context\n");
exit(2);
}
/* put sample parameters */
c->bit_rate = 400000;
/* resolution must be a multiple of two */
c->width = 352;
c->height = 288;
/* frames per second */
c->time_base = (AVRational){1,25};
/* emit one intra frame every ten frames
* check frame pict_type before passing frame
* to encoder, if frame->pict_type is AV_PICTURE_TYPE_I
* then gop_size is ignored and the output of encoder
* will always be I frame irrespective to gop_size
*/
c->gop_size = 10;
c->max_b_frames = 1;
c->pix_fmt = AV_PIX_FMT_YUV420P;
if (codec_id == AV_CODEC_ID_H264)
av_opt_set(c->priv_data, "preset", "slow", 0);
/* open it */
if (avcodec_open2(c, codec, NULL) < 0) {
fprintf(stderr, "Could not open codec\n");
exit(3);
}
f = fopen(filename, "wb");
if (!f) {
fprintf(stderr, "Could not open %s\n", filename);
exit(4);
}
frame = avcodec_alloc_frame();// Dans une version plus récente c'est av_frame_alloc
if (!frame) {
fprintf(stderr, "Could not allocate video frame\n");
exit(5);
}
frame->format = c->pix_fmt;
frame->width = c->width;
frame->height = c->height;
/* the image can be allocated by any means and av_image_alloc() is
* just the most convenient way if av_malloc() is to be used */
ret = av_image_alloc(frame->data, frame->linesize, c->width, c->height,
c->pix_fmt, 32);
if (ret < 0) {
fprintf(stderr, "Could not allocate raw picture buffer\n");
exit(6);
}
//
// RGB to YUV:
// http://stackoverflow.com/questions/16667687/how-to-convert-rgb-from-yuv420p-for-ffmpeg-encoder
//
// Create some dummy RGB "frame"
uint8_t *rgba32Data = new uint8_t[4*c->width*c->height];
SwsContext * ctx = sws_getContext(c->width, c->height,
AV_PIX_FMT_RGBA, c->width, c->height,
AV_PIX_FMT_YUV420P, 0, 0, 0, 0);
/* encode 1 second of video */
for (i = 0; i < 25; i++) {
av_init_packet(&pkt);
pkt.data = NULL; // packet data will be allocated by the encoder
pkt.size = 0;
fflush(stdout);
/* prepare a dummy image */
/* Y */
// for (y = 0; y < c->height; y++) {
// for (x = 0; x < c->width; x++) {
// frame->data[0][y * frame->linesize[0] + x] = x + y + i * 3;
// }
// }
//
// /* Cb and Cr */
// for (y = 0; y < c->height/2; y++) {
// for (x = 0; x < c->width/2; x++) {
// frame->data[1][y * frame->linesize[1] + x] = 128 + y + i * 2;
// frame->data[2][y * frame->linesize[2] + x] = 64 + x + i * 5;
// }
// }
uint8_t *pos = rgba32Data;
for (y = 0; y < c->height; y++)
{
for (x = 0; x < c->width; x++)
{
pos[0] = i / (float)25 * 255;
pos[1] = 0;
pos[2] = x / (float)(c->width) * 255;
pos[3] = 255;
pos += 4;
}
}
uint8_t * inData[1] = { rgba32Data }; // RGBA32 have one plane
//
// NOTE: In a more general setting, the rows of your input image may
// be padded; that is, the bytes per row may not be 4 * width.
// In such cases, inLineSize should be set to that padded width.
//
int inLinesize[1] = { 4*c->width }; // RGBA stride
sws_scale(ctx, inData, inLinesize, 0, c->height, frame->data, frame->linesize);
frame->pts = i;
/* encode the image */
ret = avcodec_encode_video2(c, &pkt, frame, &got_output);
if (ret < 0) {
fprintf(stderr, "Error encoding frame\n");
exit(7);
}
if (got_output) {
printf("Write frame %3d (size=%5d)\n", i, pkt.size);
fwrite(pkt.data, 1, pkt.size, f);
av_free_packet(&pkt);
}
}
/* get the delayed frames */
for (got_output = 1; got_output; i++) {
fflush(stdout);
ret = avcodec_encode_video2(c, &pkt, NULL, &got_output);
if (ret < 0) {
fprintf(stderr, "Error encoding frame\n");
exit(8);
}
if (got_output) {
printf("Write frame %3d (size=%5d)\n", i, pkt.size);
fwrite(pkt.data, 1, pkt.size, f);
av_free_packet(&pkt);
}
}
/* add sequence end code to have a real mpeg file */
fwrite(endcode, 1, sizeof(endcode), f);
fclose(f);
avcodec_close(c);
av_free(c);
av_freep(&frame->data[0]);
avcodec_free_frame(&frame);// Dans une version plus récente c'est av_frame_alloc
printf("\n");
}
int main()
{
Decode d;
avcodec_register_all();
d.video_encode_example("/home/Dave/Desktop/test.mpg",AV_CODEC_ID_MPEG2VIDEO);
}When I run this application, my Linux terminal shows me the following error :
[swscaler @ 0x1e1dc60] Exactly one scaler algorithm must be chosen
Segmentation fault (core dumped)I do not know what is actually happening. Could you help me please ?
Best regards
Dave_Dev
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