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Richard Stallman et le logiciel libre
19 octobre 2011, par
Mis à jour : Mai 2013
Langue : français
Type : Texte
Autres articles (56)
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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 (9975)
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FFMPEG and Mencoder building screenshot returns 0 size images
12 avril 2014, par GenusI have a script and it used to work fine but suddenly it stopped working and giving me zero size images as screenshot after video convert.
here is the command for video screenshot.
$cmd = $GLOBALS["paths"]["ffmpeg"]." -y -i ".$file." -f mjpeg -r 1 -ss ".$time." -vframes 1 -an ".$tmpdir."/00000001.jpg 2>&1";
exec($cmd,$results);Debug :
-----------------------------------------------------
------------mencoder_and_fmpeg.php SCREENSHOT -------
-----------------------------------------------------
COMMAND: ffmpeg -y -i /home/TESTING/public_html/vid/6d/ad/29/6dad2946a2ba102.flv -f mjpeg -r 1 -ss 14.48 -vframes 1 -an /home/TESTING/public_html/scr/42/3a/92/00000001.jpg 2>&1
FFmpeg version SVN-r16244, Copyright (c) 2000-2008 Fabrice Bellard, et al.
configuration: --disable-mmx --enable-shared --enable-libvorbis --enable-gpl --enable-swscale --enable-pthreads --disable-static --disable-demuxer=v4l --disable-demuxer=v4l2 --enable-libtheora --enable-gpl --enable-libspeex --enable-libmp3lame --enable-libfaac --enable-libfaad --enable-libfaadbin --enable-libamr-nb --enable-libamr-wb --enable-nonfree --enable-libxvid
libavutil 49.12. 0 / 49.12. 0
libavcodec 52. 7. 0 / 52.108. 0
libavformat 52.23. 1 / 52.92. 0
libavdevice 52. 1. 0 / 52. 2. 3
libswscale 0. 6. 1 / 0.12. 0
built on Apr 9 2011 22:48:41, gcc: 4.1.2 20080704 (Red Hat 4.1.2-50)
built by Admin-Ahead Server Technologies FFmpeg installer v5.0.6b
Seems stream 0 codec frame rate differs from container frame rate: 1000.00 (1000/1) -> 10.92 (131/12)
Stream mapping:
Stream #0.0 -> #0.0
Press [q] to stop encoding
ffmpeg: symbol lookup error: ffmpeg: undefined symbol: frame_hook_process -
FFmpeg - avcodec_receive_frame returns AVERROR(EAGAIN)
8 novembre 2019, par JinxI’m using an QOpenGL widget to draw frames. However, I’m struggling to get frames by using
avcodec_receive_frame. It ended within the blockelse if (ret == AVERROR(EAGAIN))and returned -11. I have no idea what made this happen. Also I checked that codecs were fine, so I guess the problem wasn’t caused by codecs.MyDemux.cpp
AVPacket* MyDemux::allocatePacket()
{
AVPacket* packet = av_packet_alloc();
return packet;
}
AVFrame* MyDemux::allocateFrame()
{
AVFrame* frame = av_frame_alloc();
return frame;
}
int MyDemux::readFrame(AVPacket* packet)
{
mux.lock();
if (!formatCtx) {
std::cout << "formaetCtx is null" << std::endl;
mux.unlock();
return -1;
}
int ret = av_read_frame(formatCtx, packet);
if (ret == AVERROR_EOF) {
return -2;
}
if (ret != 0) {
mux.unlock();
av_packet_free(&packet);
return -1;
}
media_type = packet->stream_index;
mux.unlock();
return 0;
}MyDecode.cpp
void MyDecode::decode(AVFrame* frame, AVPacket* packet)
{
int ret;
ret = avcodec_send_packet(codecCtx, packet); // this returned 0
while (ret == 0) {
ret = avcodec_receive_frame(codecCtx, frame); // this returned -11
if (ret == AVERROR(EINVAL)) {
std::cout << "codec issue" << std::endl;
av_frame_free(&frame);
return;
}
else if (ret == AVERROR(EAGAIN)) { // program ends here
std::cout << "output is not available this state" << std::endl;
av_frame_free(&frame);
return;
}
else if (ret == AVERROR(EINVAL)) {
std::cout << "no more frames" << std::endl;
av_frame_free(&frame);
return;
}
}
}main.cpp
class MyThread : public QThread
{
public:
MyDemux demux;
MyDecode video_decode;
myDecode audio_decode;
MyVideoWidget* videoWidget;
AVPacket* packet;
AVFrame* frame;
void initThread()
{
char* url = "demo.mp4";
demux.openFile(url);
video_decode.openCodec(demux.copy_video_codec_par());
audio_decode.openCodec(demux.copy_audio_codec_par());
packet = demux.allocatePacket();
frame = demux.allocateFrame();
}
void run()
{
while (demux.readFrame(packet) != -2) {
if (demux.get_media_type() == 0) {
video_decode.decode(frame, packet);
videoWidget->paintFrame(frame);
}
else if (demux.get_media_type() == 1) {
}
}
video_decode.decode(frame, nullptr);
demux.clear();
demux.close();
}
}; -
ffmpeg : libavfilter API av_buffersink_get_frame returns alway EAGAIN
29 juin 2024, par aculnaigI want to resize an image with
libavfilterC API throughzscalefilter andlibplacebofilter but no matter how I callav_buffersink_get_frame, it always returnsEAGAINand no data is filled in thefiltered_frame.

#include 
#include 
#include 
#include 
#include 

#include <libavcodec></libavcodec>avcodec.h>
#include <libavformat></libavformat>avformat.h>
#include <libavfilter></libavfilter>avfilter.h>
#include <libavfilter></libavfilter>buffersrc.h>
#include <libavfilter></libavfilter>buffersink.h>
#include <libavutil></libavutil>log.h>

int main(int argc, char **argv)
{
 if (argc != 2) {
 fprintf(stderr, "usage: %s <filename>\n", argv[0]);
 exit(EXIT_FAILURE);
 }

 const char *src_name = argv[1];
 const char *dst_name = basename(src_name);
 int ret = 0;

 const enum AVPixelFormat src_format = AV_PIX_FMT_YUV422P;

 av_log_set_level(AV_LOG_TRACE);

 AVFormatContext *fmt_ctx = avformat_alloc_context();
 if (fmt_ctx == NULL) {
 av_log(NULL, AV_LOG_TRACE, "avformat_alloc_context(): failed.\n");
 exit(EXIT_SUCCESS);
 }
 if ((ret = avformat_open_input(&fmt_ctx, src_name, NULL, NULL)) != 0) {
 av_log(NULL, AV_LOG_TRACE, "avformat_open_input(): %s.\n", av_err2str(ret));
 exit(EXIT_SUCCESS);
 }

 AVCodecContext *dec_ctx;
 AVCodec *dec;

 if ((ret = av_find_best_stream(fmt_ctx, AVMEDIA_TYPE_VIDEO, -1, -1, &dec, 0)) < 0) {
 av_log(NULL, AV_LOG_TRACE, "av_find_best_stream(): %s.\n", av_err2str(ret));
 exit(EXIT_SUCCESS);
 }
 dec_ctx = avcodec_alloc_context3(dec);
 if (dec_ctx == NULL) {
 av_log(NULL, AV_LOG_TRACE, "avcodec_alloc_context3(): failed.\n");
 exit(EXIT_SUCCESS);
 }
 if ((ret = avcodec_open2(dec_ctx, dec, NULL)) < 0) {
 av_log(NULL, AV_LOG_TRACE, "avcodec_open2(): %s.\n", av_err2str(ret));
 exit(EXIT_SUCCESS);
 }

 AVFrame *frame = av_frame_alloc();
 if (frame == NULL) {
 av_log(NULL, AV_LOG_TRACE, "av_frame_alloc(): failed.\n");
 exit(EXIT_SUCCESS);
 }
 AVPacket *packet = av_packet_alloc();
 if (packet == NULL) {
 av_log(NULL, AV_LOG_TRACE, "av_packet_alloc(): failed.\n");
 exit(EXIT_SUCCESS);
 }

 if ((ret = av_read_frame(fmt_ctx, packet)) < 0) {
 av_log(NULL, AV_LOG_TRACE, "av_read_frame(): %s.\n", av_err2str(ret));
 exit(EXIT_SUCCESS);
 }
 ret = avcodec_send_packet(dec_ctx, packet);
 if (ret == AVERROR(EAGAIN)) {
 av_log(NULL, AV_LOG_TRACE, "avcodec_send_packet(): %s.\n", av_err2str(ret));
 avcodec_receive_frame(dec_ctx, frame);
 avcodec_send_packet(dec_ctx, packet);
 }
 
 if ((ret = avcodec_receive_frame(dec_ctx, frame)) < 0) {
 av_log(NULL, AV_LOG_TRACE, "avcodec_receive_frame(): %s.\n", av_err2str(ret));
 exit(EXIT_SUCCESS);
 }
 av_packet_unref(packet);

 av_log(NULL, AV_LOG_TRACE, "filename: %s, w: %d, h: %d, fmt: %d\n", src_name, frame->width, frame->height, frame->format);

 AVFilterGraph *filter_graph = avfilter_graph_alloc();

 char buffersrc_args[512];
 snprintf(buffersrc_args, sizeof(buffersrc_args), "video_size=%dx%d:pix_fmt=%d:time_base=1/25", frame->width, frame->height, frame->format); 

 AVFilterContext *buffersrc_ctx;
 if ((ret = avfilter_graph_create_filter(&buffersrc_ctx, avfilter_get_by_name("buffer"), NULL, buffersrc_args, NULL, filter_graph)) < 0) {
 av_log(NULL, AV_LOG_TRACE, "avfilter_graph_create_filter(): %s.\n", av_err2str(ret));
 exit(EXIT_SUCCESS);
 }

 char libplacebo_args[512];
 snprintf(libplacebo_args, sizeof(libplacebo_args), "format=yuv420p:colorspace=bt470bg:color_primaries=bt709:color_trc=iec61966-2-1:range=pc:w=(iw/2):h=(ih/2):downscaler=none:dithering=none");
 AVFilterContext *libplacebo_ctx;
 if ((ret = avfilter_graph_create_filter(&libplacebo_ctx, avfilter_get_by_name("libplacebo"), NULL, libplacebo_args, NULL, filter_graph)) < 0) {
 av_log(NULL, AV_LOG_TRACE, "avfilter_graph_create_filter(): %s.\n", av_err2str(ret));
 exit(EXIT_SUCCESS);
 }

 AVFilterContext *buffersink_ctx;
 if ((ret = avfilter_graph_create_filter(&buffersink_ctx, avfilter_get_by_name("buffersink"), NULL, NULL, NULL, filter_graph)) < 0) {
 av_log(NULL, AV_LOG_TRACE, "avfilter_graph_create_filter(): %s.\n", av_err2str(ret));
 exit(EXIT_SUCCESS);
 }

 if ((ret = avfilter_link(buffersrc_ctx, 0, libplacebo_ctx, 0)) != 0) {
 av_log(NULL, AV_LOG_TRACE, "avfilter_link(): %s.\n", av_err2str(ret));
 exit(EXIT_SUCCESS);
 }
 if ((ret = avfilter_link(libplacebo_ctx, 0, buffersink_ctx, 0)) != 0) {
 av_log(NULL, AV_LOG_TRACE, "avfilter_link(): %s.\n", av_err2str(ret));
 exit(EXIT_SUCCESS);
 }
 
 if ((ret = avfilter_graph_config(filter_graph, NULL)) < 0) {
 av_log(NULL, AV_LOG_TRACE, "avfilter_graph_config(): %s.\n", av_err2str(ret));
 exit(EXIT_SUCCESS);
 }

 AVFrame *filtered_frame = av_frame_alloc();
 if (filtered_frame == NULL) {
 av_log(NULL, AV_LOG_TRACE, "av_frame_alloc(): failed.\n");
 exit(EXIT_SUCCESS);
 }
 if ((ret = av_buffersrc_add_frame(buffersrc_ctx, frame)) < 0) {
 av_log(NULL, AV_LOG_TRACE, "av_buffersrc_add_frame(): %s.\n", av_err2str(ret));
 exit(EXIT_SUCCESS);
 }
 
 while (1) {
 int ret = av_buffersink_get_frame(buffersink_ctx, filtered_frame);
 if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
 break;
 if (ret < 0) {
 av_log(NULL, AV_LOG_TRACE, "av_buffersink_get_frame(): %s.\n", av_err2str(ret));
 exit(EXIT_FAILURE);
 } 
 }

 av_log(NULL, AV_LOG_TRACE, "filename: %s, w: %d, h: %d, f: %d\n", dst_name, filtered_frame->width, filtered_frame->height, filtered_frame->format);

 AVCodecContext *enc_ctx;
 AVCodec *enc;
 AVPacket *enc_packet = av_packet_alloc();

 enc = avcodec_find_encoder_by_name("mjpeg");
 enc_ctx = avcodec_alloc_context3(enc);
 enc_ctx->width = filtered_frame->width;
 enc_ctx->height = filtered_frame->height;
 enc_ctx->bit_rate = dec_ctx->bit_rate * 1024;
 enc_ctx->time_base = (AVRational) {1, 25};
 enc_ctx->framerate = (AVRational) {25, 1};
 enc_ctx->pix_fmt = filtered_frame->format;
 enc_ctx->strict_std_compliance = FF_COMPLIANCE_EXPERIMENTAL;
 enc_ctx->compression_level = 0;
 enc_ctx->color_range = AVCOL_RANGE_JPEG;

 avcodec_open2(enc_ctx, enc, NULL);

 avcodec_send_frame(enc_ctx, filtered_frame);
 avcodec_receive_packet(enc_ctx, enc_packet);

 FILE *dst_file = fopen(dst_name, "wb");
 fwrite(enc_packet->data, 1, enc_packet->size, dst_file);
 fclose(dst_file);

 av_packet_unref(enc_packet);
 av_frame_free(&frame);
 av_frame_free(&filtered_frame);
 
 avfilter_graph_free(&filter_graph);

 avformat_close_input(&fmt_ctx);
 avformat_free_context(fmt_ctx);
 
 exit(EXIT_SUCCESS);
}
</filename>

and here are the logs




PS : the logs were so many I could paste in stackoverflow


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