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Médias (39)
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Stereo master soundtrack
17 octobre 2011, par
Mis à jour : Octobre 2011
Langue : English
Type : Audio
-
ED-ME-5 1-DVD
11 octobre 2011, par
Mis à jour : Octobre 2011
Langue : English
Type : Audio
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1,000,000
27 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
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Demon Seed
26 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
-
The Four of Us are Dying
26 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
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Corona Radiata
26 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
Autres articles (85)
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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" (...) -
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 -
Les formats acceptés
28 janvier 2010, parLes commandes suivantes permettent d’avoir des informations sur les formats et codecs gérés par l’installation local de ffmpeg :
ffmpeg -codecs ffmpeg -formats
Les format videos acceptés en entrée
Cette liste est non exhaustive, elle met en exergue les principaux formats utilisés : h264 : H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 m4v : raw MPEG-4 video format flv : Flash Video (FLV) / Sorenson Spark / Sorenson H.263 Theora wmv :
Les formats vidéos de sortie possibles
Dans un premier temps on (...)
Sur d’autres sites (5080)
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where to save mpd file in raspberry pi so dash.js can access it remotely ?
11 mai 2016, par DjmThis is very high level question. I want to stream a live video from raspberry pi. I want to be able to watch live video in the browser remotely being streamed by the Raspberry pi.I want to use DASH stream protocol, and Dash.js as client to HTML5. I have looked through different tutorials but i am still puzzled about how this works.I understand that (assuming you have already prepared your videos with FFMPEG tool) from the client Dash.js
you have to make a call/request and pass a url to your mpd file. My question is where would you save the file in raspberry pi especially if the Dash client is in a different web app(i want to make the call remotely) ? -
ffmpeg : save separate frames as still gifs
7 novembre 2013, par Eugene MThe question is simple : I don't want ffmpeg to create an animated GIF from given video stream, I want separate frames, each in GIF format. But when I set output file to something like
frame%09d.gifffmpeg tends to create an animation (and stores it exactly asframe%09d.gif). The same for-f gifoption.Of course, I could save PNGs and use ImageMagic's
convertutility to transform them to GIFs, but I don't want any additional invocation overhead because I'm dealing with live streams and going to crunch large amounts of data.Here is what I do, nothing special :
ffmpeg -i http://brightcove03-f.akamaihd.net/valgbodmandag1378107345_1_300k@80362 -f gif -y frame_%09d.gif
ffmpeg version N-54643-g15cee5e Copyright (c) 2000-2013 the FFmpeg developers
built on Jul 11 2013 03:35:11 with gcc 4.7.3 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnu
tls --enable-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libilbc --enable-libmodplug --ena
ble-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger -
-enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-lib
vpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
libavutil 52. 39.100 / 52. 39.100
libavcodec 55. 18.102 / 55. 18.102
libavformat 55. 12.101 / 55. 12.101
libavdevice 55. 3.100 / 55. 3.100
libavfilter 3. 80.100 / 3. 80.100
libswscale 2. 3.100 / 2. 3.100
libswresample 0. 17.102 / 0. 17.102
libpostproc 52. 3.100 / 52. 3.100
[flv @ 00000000002cb700] Stream discovered after head already parsed
Input #0, flv, from 'http://brightcove03-f.akamaihd.net/valgbodmandag1378107345_1_300k@80362':
Metadata:
encoder : Lavf54.6.100
Duration: 00:00:00.00, start: 0.000000, bitrate: N/A
Stream #0:0: Video: h264 (Constrained Baseline), yuv420p, 480x270 [SAR 1:1 DAR 16:9], 25 tbr, 1k tbn, 50 tbc
Stream #0:1: Audio: aac, 44100 Hz, stereo, fltp, 128 kb/s
Stream #0:2: Data: none
[swscaler @ 0000000004d051e0] No accelerated colorspace conversion found from yuv420p to bgr8.
Output #0, gif, to 'frame_%09d.gif':
Metadata:
encoder : Lavf55.12.101
Stream #0:0: Video: gif, bgr8, 480x270 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 100 tbn, 25 tbc
Stream mapping:
Stream #0:0 -> #0:0 (h264 -> gif)
Press [q] to stop, [?] for help
frame= 141 fps=130 q=-1.0 Lsize= 4960kB time=00:00:05.68 bitrate=7153.1kbits/s
video:5100kB audio:0kB subtitle:0 global headers:0kB muxing overhead -2.743247%After all I get a file named "frame_%03d.gif", but instead I want to have several files "frame_001.gif", "frame_002.gif", etc.
Any ideas ?
Thanks in advance. -
How to save the video stream as h264
16 mars 2023, par aaadddzxcI pull the stream through ffmpeg, and then save the video of this stream as an h264 file, but the saved file cannot be played. Why is this ?


The h264 saved by the following code cannot be played,i dont know why...


i try to vlc play, but cant play the h264 file.


can be save to h264 without avformat_alloc_output_context2 function ?


#include <thread>
#include <iostream>
#include <fstream>
extern "C"
{
#include <libavcodec></libavcodec>avcodec.h>
#include <libavcodec></libavcodec>bsf.h>
#include <libavformat></libavformat>avformat.h>
}

#pragma comment(lib,"avcodec.lib")
#pragma comment(lib,"avdevice.lib")
#pragma comment(lib,"avfilter.lib")
#pragma comment(lib,"avformat.lib")
#pragma comment(lib,"avutil.lib")
#pragma comment(lib,"swresample.lib")
#pragma comment(lib,"swscale.lib")

int mp4toannexb(AVBSFContext* bsf_ctx, AVPacket* pkt, std::ofstream& out)
{
 int ret;

 ret = av_bsf_send_packet(bsf_ctx, pkt);
 if (ret < 0) {
 std::cout << "bsf send packet failed, errno:" << ret << std::endl;
 return -1;
 }

 for (;;) {
 ret = av_bsf_receive_packet(bsf_ctx, pkt);
 if (AVERROR_EOF == ret || AVERROR(EAGAIN) == ret) {
 return 0;
 }
 if (ret < 0) {
 std::cout << "Could not receive packet, errno:" << ret << std::endl;
 return -1;
 }
 out.write((const char*)pkt->data, pkt->size);
 }
 return 0;
}


int main()
{
 AVOutputFormat* ofmt = NULL;
 AVFormatContext* ifmt_ctx = NULL;
 AVBSFContext* bsf_ctx = NULL;
 AVPacket* pkt = NULL;
 const char* in_filename = "http://192.168.1.12:8088/live/123.flv";
 int ret = -1;
 int video_index = -1;
 std::ofstream outh264("D:\\ConsoleApplication1\\Debug\\out.h264", std::ios::binary | std::ios::trunc);

 avformat_network_init();

 if ((ifmt_ctx = avformat_alloc_context()) == NULL) {
 std::cout << "avformat_alloc_context failed." << std::endl;
 exit(1);
 }

 if ((ret = avformat_open_input(&ifmt_ctx, in_filename, 0, 0)) < 0) {
 std::cout << "Could not open input file." << std::endl;
 exit(1);
 }

 if ((ret = avformat_find_stream_info(ifmt_ctx, 0)) < 0) {
 std::cout << "Failed to retrieve input stream information" << std::endl;
 return -1;
 }

 if (!(pkt = av_packet_alloc())) {
 std::cout << "Could not allocate packet" << std::endl;
 return -1;
 }

 video_index = av_find_best_stream(ifmt_ctx, AVMEDIA_TYPE_VIDEO, -1, -1, NULL, 0);
 if (video_index < 0) {
 std::cout << "Could not find stream " << std::string(av_get_media_type_string(AVMEDIA_TYPE_VIDEO)) << std::endl;
 return -1;
 }

 av_dump_format(ifmt_ctx, 0, in_filename, 0);

 const AVBitStreamFilter* filter = av_bsf_get_by_name("h264_mp4toannexb");
 if (NULL == filter) {
 std::cout << "Could not create filter" << std::endl;
 return -1;
 }

 ret = av_bsf_alloc(filter, &bsf_ctx);
 if (ret < 0) {
 printf("Could not alloc bitstream filter \n");
 return -1;
 }

 // avcodec_parameters_from_context
 ret = avcodec_parameters_copy(bsf_ctx->par_in, ifmt_ctx->streams[video_index]->codecpar);
 if (ret < 0) {
 printf("Parameter copy filed, errno: %d \n", ret);
 return -1;
 }

 ret = av_bsf_init(bsf_ctx);
 if (ret < 0) {
 printf("BSF init failed, errno: %d \n", ret);
 return -1;
 }

 while (av_read_frame(ifmt_ctx, pkt) >= 0) {
 if (pkt->stream_index == video_index)
 {
 mp4toannexb(bsf_ctx, pkt, outh264);
 }
 av_packet_unref(pkt);
 }
 outh264.close();
 avformat_close_input(&ifmt_ctx);
 av_packet_free(&pkt);
 av_bsf_free(&bsf_ctx);

 return 0;
}
</fstream></iostream></thread>

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