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Autres articles (69)
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Websites made with MediaSPIP
2 mai 2011, parThis page lists some websites based on MediaSPIP.
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MediaSPIP v0.2
21 juin 2013, parMediaSPIP 0.2 est la première version de MediaSPIP stable.
Sa date de sortie officielle est le 21 juin 2013 et est annoncée ici.
Le fichier zip ici présent contient uniquement les sources de MediaSPIP en version standalone.
Comme pour la version précédente, il est nécessaire d’installer manuellement l’ensemble des dépendances logicielles sur le serveur.
Si vous souhaitez utiliser cette archive pour une installation en mode ferme, il vous faudra également procéder à d’autres modifications (...) -
Creating farms of unique websites
13 avril 2011, parMediaSPIP platforms can be installed as a farm, with a single "core" hosted on a dedicated server and used by multiple websites.
This allows (among other things) : implementation costs to be shared between several different projects / individuals rapid deployment of multiple unique sites creation of groups of like-minded sites, making it possible to browse media in a more controlled and selective environment than the major "open" (...)
Sur d’autres sites (7237)
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Streaming video written using FFmpeg (C# using AutoGen) sends multiple data requests
26 juin 2016, par williamtroupI’ve written a video generator that rights a video in h264 format (mp4). When I stream the video from my azure service, i’m seeing the following network traffic :
The AVCodecContext layout I’m using is as follows :
AVCodec* videoCodec = ffmpeg.avcodec_find_encoder(AVCodecID.AV_CODEC_ID_H264)
AVCodecContext* videoCodecContext = ffmpeg.avcodec_alloc_context3(videoCodec);
videoCodecContext->bit_rate = 400000;
videoCodecContext->width = 1280;
videoCodecContext->height = 720;
videoCodecContext->gop_size = 12;
videoCodecContext->max_b_frames = 1;
videoCodecContext->pix_fmt = videoCodec->pix_fmts[0];
videoCodecContext->codec_id = videoCodec->id;
videoCodecContext->codec_type = videoCodec->type;
videoCodecContext->time_base = new AVRational
{
num = 1,
den = 30
};
ffmpeg.av_opt_set(videoCodecContext->priv_data, "preset", "ultrafast");I cannot figure out how to solve this problem. Videos generating using Windows Movie Maker stream perfectly.
Also, this appears to only happening in Google Chrome.
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QRTLE is supported by ffmpeg ?
22 avril 2016, par Sagar- I am trying to create video using QRTLE format with RGB24 or ARGB pixel format in ffmpeg library.But video is not played.
- But is i use H264 format with yuv format then it’s working fine.
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Is QRTLE is not supported by ffmpeg or i m doing any mistake ?
static void 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((AVCodecID) codec_id);
// codec = 28;
if (!codec) {
fprintf(stderr, "Codec not found : %d\n", codec_id);
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 = 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_RGB24;
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);
}
f = fopen(filename, "wb");
if (!f) {
fprintf(stderr, "Could not open %s\n", filename);
exit(1);
}
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 */
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(1);
}
////////////////////////////////////
cv::Mat input = imread("image for creating video(image.png)");
Mat output;
resize(input, input, Size(c->width, c->height));
cvtColor(input, input, CV_BGR2RGB);
av_image_fill_arrays(frame->data, frame->linesize, input.data,
c->pix_fmt, c->width, c->height, 1);
////////////////////////////////////
for (i = 0; i < 250; 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_packet_unref(&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_packet_unref(&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");
}
int main() {
av_register_all();
video_encode_example("test.mov", AV_CODEC_ID_QTRLE);
}
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How do I download a list mpd with ffmpeg
13 mai 2016, par Don DonlleiI did download the video from a site that used M3U8 but he moved to mpd and do not know how do I download it.
<mpd type="static" minbuffertime="PT1S" mediapresentationduration="PT0H1M56.320S" profiles="urn:mpeg:dash:profile:full:2011"><programinformation moreinformationurl="http://gpac.sourceforge.net"></programinformation><period start="PT0S" duration="PT0H1M56.320S"><adaptationset segmentalignment="true" maxwidth="1920" maxheight="1080" maxframerate="25" par="16:9"><contentcomponent contenttype="video"></contentcomponent><contentcomponent contenttype="audio"></contentcomponent><segmenttemplate timescale="1000" duration="9693" media="$RepresentationID$/Y7aRjDxbh_$Number$.m4s" startnumber="1" initialization="$RepresentationID$/Y7aRjDxbh_init.mp4"></segmenttemplate><representation mimetype="video/mp4" codecs="avc3.64000d,mp4a.40.2" width="320" height="240" framerate="25" sar="4:3" audiosamplingrate="44100" startwithsap="1" bandwidth="400000">
</representation><representation mimetype="video/mp4" codecs="avc3.64001e,mp4a.40.2" width="720" height="480" framerate="25" sar="32:27" audiosamplingrate="44100" startwithsap="1" bandwidth="900000">
</representation><representation mimetype="video/mp4" codecs="avc3.64001f,mp4a.40.2" width="960" height="720" framerate="25" sar="4:3" audiosamplingrate="44100" startwithsap="1" bandwidth="1500000">
</representation><representation mimetype="video/mp4" codecs="avc3.640028,mp4a.40.2" width="1920" height="1080" framerate="25" sar="1:1" audiosamplingrate="44100" startwithsap="1" bandwidth="3500000">
</representation><representation mimetype="video/mp4" codecs="avc3.640028,mp4a.40.2" width="2730" height="1440" framerate="25" sar="1:1" audiosamplingrate="44100" startwithsap="1" bandwidth="10000000">
</representation><representation mimetype="video/mp4" codecs="avc3.640028,mp4a.40.2" width="4096" height="2160" framerate="25" sar="1:1" audiosamplingrate="44100" startwithsap="1" bandwidth="20000000">
</representation></adaptationset></period></mpd>
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