Recherche avancée

Médias (0)

Mot : - Tags -/formulaire

Aucun média correspondant à vos critères n’est disponible sur le site.

Autres articles (87)

  • Emballe médias : à quoi cela sert ?

    4 février 2011, par

    Ce plugin vise à gérer des sites de mise en ligne de documents de tous types.
    Il crée des "médias", à savoir : un "média" est un article au sens SPIP créé automatiquement lors du téléversement d’un document qu’il soit audio, vidéo, image ou textuel ; un seul document ne peut être lié à un article dit "média" ;

  • Contribute to documentation

    13 avril 2011

    Documentation is vital to the development of improved technical capabilities.
    MediaSPIP welcomes documentation by users as well as developers - including : critique of existing features and functions articles contributed by developers, administrators, content producers and editors screenshots to illustrate the above translations of existing documentation into other languages
    To contribute, register to the project users’ mailing (...)

  • Configuration spécifique pour PHP5

    4 février 2011, par

    PHP5 est obligatoire, vous pouvez l’installer en suivant ce tutoriel spécifique.
    Il est recommandé dans un premier temps de désactiver le safe_mode, cependant, s’il est correctement configuré et que les binaires nécessaires sont accessibles, MediaSPIP devrait fonctionner correctement avec le safe_mode activé.
    Modules spécifiques
    Il est nécessaire d’installer certains modules PHP spécifiques, via le gestionnaire de paquet de votre distribution ou manuellement : php5-mysql pour la connectivité avec la (...)

Sur d’autres sites (3717)

  • ffmpeg generates file with only audio from ts

    8 novembre 2016, par Seoman

    I’m trying to get some parts of a ts video and then merge them into a new video. The problem is that when doing the split, the video is lost. The splits only contains audio. Here is the video source information :

    ffmpeg -i source_file.ts

    ffmpeg version 3.0.1 Copyright (c) 2000-2016 the FFmpeg developers
    
built with Apple LLVM version 7.3.0 (clang-703.0.29)
    
configuration: --prefix=/usr/local/Cellar/ffmpeg/3.0.1 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-opencl --enable-libx264 --enable-libmp3lame --enable-libxvid --enable-vda
    
libavutil      55. 17.103 / 55. 17.103
    
libavcodec     57. 24.102 / 57. 24.102
    
libavformat    57. 25.100 / 57. 25.100
    
libavdevice    57.  0.101 / 57.  0.101
    
libavfilter     6. 31.100 /  6. 31.100
    
libavresample   3.  0.  0 /  3.  0.  0
    
libswscale      4.  0.100 /  4.  0.100
    
libswresample   2.  0.101 /  2.  0.101
    
libpostproc    54.  0.100 / 54.  0.100
    
Input #0, mpegts, from '97274181.ts':
    
Duration: 00:02:30.70, start: 60.000000, bitrate: 3582 kb/s
    
Program 1 
    
Stream #0:0[0x100]: Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 139 kb/s
    
Stream #0:1[0x101]: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p(tv, unknown/bt709/unknown), 1920x1080, 60 fps, 60 tbr, 90k tbn, 2k tbc
    
Stream #0:2[0x102]: Data: timed_id3 (ID3  / 0x20334449)
    
At least one output file must be specified

    This is the command used for doing the split :

    ffmpeg -ss 10 -i source_file.ts -t 5 -c copy cut1.ts

    And this is the video information after the cut :

    ffmpeg version 3.0.1 Copyright (c) 2000-2016 the FFmpeg developers
    
built with Apple LLVM version 7.3.0 (clang-703.0.29)
    
configuration: --prefix=/usr/local/Cellar/ffmpeg/3.0.1 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-opencl --enable-libx264 --enable-libmp3lame --enable-libxvid --enable-vda
    
libavutil      55. 17.103 / 55. 17.103
    
libavcodec     57. 24.102 / 57. 24.102
    
libavformat    57. 25.100 / 57. 25.100
    
libavdevice    57.  0.101 / 57.  0.101
    
libavfilter     6. 31.100 /  6. 31.100
    
libavresample   3.  0.  0 /  3.  0.  0
    
libswscale      4.  0.100 /  4.  0.100
    
libswresample   2.  0.101 /  2.  0.101
    
libpostproc    54.  0.100 / 54.  0.100
    
[NULL @ 0x7fc9ba008000] start time for stream 0 is not set in estimate_timings_from_pts
    
[mpegts @ 0x7fc9b9800000] Could not find codec parameters for stream 0 (Video: h264 ([27][0][0][0] / 0x001B), none): unspecified size
    
Consider increasing the value for the 'analyzeduration' and 'probesize' options
    
Input #0, mpegts, from 'siri1.ts':
    
Duration: 00:00:05.08, start: 1.400000, bitrate: 148 kb/s
    
Program 1 
    
Metadata:
    
  service_name    : Service01
    
  service_provider: FFmpeg
    
Stream #0:0[0x100]: Video: h264 ([27][0][0][0] / 0x001B), none, 90k tbr, 90k tbn, 180k tbc
    
Stream #0:1[0x101]: Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 120 kb/s
    
At least one output file must be specified

    If I reproduce cut1.ts I can only hear the audio. Video is gone.

  • FFmpeg(C/libav) VPX to mpeg2video stream cannot be reproduce in VLC

    21 septembre 2017, par caiomcg

    I am currently trying to transcode a VPX(VP8/VP9) video to a mpeg2video and stream it over UDP with mpegts.

    I have initialized all of the contexts and the streams and as long as I stream it to ffplay it works, if I send the stream to VLC or another player, the receiver only display the first frame and do nothing else. If I do the same thing through the command line it works flawlessly - ffmpeg -re -i video.webm -an -f mpegts udp://127.0.0.1:8080

    My output context :

    this->output_codec_ctx_->codec_type    = AVMEDIA_TYPE_VIDEO; // Set media type
    
this->output_codec_ctx_->pix_fmt       = AV_PIX_FMT_YUV420P; // Set stream pixel format
    
this->output_codec_ctx_->time_base.den = ceil(av_q2d(input_stream->r_frame_rate));     // Add the real video framerate. Eg.: 29.9
    
this->output_codec_ctx_->time_base.num = 1;                  // Numerator of the framerate. Eg.: num/29.9
    
this->output_codec_ctx_->width         = input_stream->codecpar->width;  // Video width
    
this->output_codec_ctx_->height        = input_stream->codecpar->height; // Video height
    
this->output_codec_ctx_->bit_rate      = 400000; // Video quality
    
this->output_codec_ctx_->gop_size      = 12;
    
this->output_codec_ctx_->max_b_frames  = 2;
    
this->output_codec_ctx_->framerate     = this->input_codec_ctx_->framerate;
    
this->output_codec_ctx_->sample_aspect_ratio     = this->input_codec_ctx_->sample_aspect_ratio;

    My av_dump :

    Output #0, mpegts, to 'udp://127.0.0.1:20010':
    
  Metadata:
    
    encoder         : Lavf57.72.101
    
    Stream #0:0: Video: mpeg2video (Main), 1 reference frame, yuv420p, 480x640 (0x0), q=2-31, 400 kb/s, SAR 1:1 DAR 3:4, 24 fps, 24 tbr, 90k tbn

    FFMPEG av_dump :

    Output #0, mpegts, to 'udp://127.0.0.1:20010':
    
  Metadata:
    
    title           : Tears of Steel
    
    encoder         : Lavf57.72.101
    
    Stream #0:0: Video: mpeg2video (Main), yuv420p, 480x640 [SAR 1:1 DAR 3:4], q=2-31, 200 kb/s, 24 fps, 90k tbn, 24 tbc (default)
    
    Metadata:
    
      encoder         : Lavc57.96.101 mpeg2video
    
    Side data:
    
      cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1

    Any ideia on what I may be doing wrong ?

  • ffmpeg create RTP stream

    27 novembre 2016, par DankMemes

    I’m trying to encode and stream using ffmpeg (libavcodec/libavformat - MSVC x64 with Zeranoe builds)

    Here is my code, largely adapted from the encoding example, error handling removed

    #include "stdafx.h"
    
extern "C" {
    
#include <libavformat></libavformat>avformat.h>
    
#include <libavcodec></libavcodec>avcodec.h>
    

    
#include <libavutil></libavutil>opt.h>
    
#include <libavutil></libavutil>channel_layout.h>
    
#include <libavutil></libavutil>common.h>
    
#include <libavutil></libavutil>imgutils.h>
    
#include <libavutil></libavutil>mathematics.h>
    
#include <libavutil></libavutil>samplefmt.h>
    
}
    
#pragma comment(lib, "avformat.lib")
    
#pragma comment(lib, "avutil.lib")
    
#pragma comment(lib, "avcodec.lib")
    

    
int main() {
    
    avcodec_register_all();
    
    av_register_all();
    
    avformat_network_init();
    

    
    AVCodecID codec_id = AV_CODEC_ID_H264;
    
    AVCodec *codec;
    
    AVCodecContext *c = NULL;
    
    int i, ret, x, y, got_output;
    
    AVFrame *frame;
    
    AVPacket pkt;
    

    
    codec = avcodec_find_encoder(codec_id);
    
    c = avcodec_alloc_context3(codec);
    

    
    c->bit_rate = 400000;
    
    c->width = 352;
    
    c->height = 288;
    
    c->time_base.num = 1;
    
    c->time_base.den = 25;
    
    c->gop_size = 25;
    
    c->max_b_frames = 1;
    
    c->pix_fmt = AV_PIX_FMT_YUV420P;
    
    c->codec_type = AVMEDIA_TYPE_VIDEO;
    
    c->flags = CODEC_FLAG_GLOBAL_HEADER;
    

    
    if (codec_id == AV_CODEC_ID_H264) {
    
        ret = av_opt_set(c->priv_data, "preset", "ultrafast", 0);
    
        ret = av_opt_set(c->priv_data, "tune", "zerolatency", 0);
    
    }
    

    
    avcodec_open2(c, codec, NULL)
    

    
    frame = av_frame_alloc();
    
    frame->format = c->pix_fmt;
    
    frame->width = c->width;
    
    frame->height = c->height;
    
    ret = av_image_alloc(frame->data, frame->linesize, c->width, c->height,
    
        c->pix_fmt, 32);
    

    
    AVFormatContext* avfctx;
    
    AVOutputFormat* fmt = av_guess_format("rtp", NULL, NULL);
    

    
    ret = avformat_alloc_output_context2(&amp;avfctx, fmt, fmt->name,
    
        "rtp://127.0.0.1:49990");
    

    
    printf("Writing to %s\n", avfctx->filename);
    

    
    avio_open(&amp;avfctx->pb, avfctx->filename, AVIO_FLAG_WRITE)
    

    
    struct AVStream* stream = avformat_new_stream(avfctx, codec);
    
    stream->codecpar->bit_rate = 400000;
    
    stream->codecpar->width = 352;
    
    stream->codecpar->height = 288;
    
    stream->codecpar->codec_id = AV_CODEC_ID_H264;
    
    stream->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
    
    stream->time_base.num = 1;
    
    stream->time_base.den = 25;
    

    
    avformat_write_header(avfctx, NULL);
    
    char buf[200000];
    
    AVFormatContext *ac[] = { avfctx };
    
    av_sdp_create(ac, 1, buf, 20000);
    
    printf("sdp:\n%s\n", buf);
    
    FILE* fsdp;
    
    fopen_s(&amp;fsdp, "test.sdp", "w");
    
    fprintf(fsdp, "%s", buf);
    
    fclose(fsdp);
    
    system("PAUSE");
    
    system("start "" \"C:\\Program Files (x86)\\VideoLAN\\VLC\\vlc.exe\" test.sdp");
    

    
    int j = 0;
    
    for (i = 0; i &lt; 10000; i++) {
    
        av_init_packet(&amp;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 &lt; c->height; y++) {
    
            for (x = 0; x &lt; c->width; x++) {
    
                frame->data[0][y * frame->linesize[0] + x] = x + y + i * 3;
    
            }
    
        }
    
        /* Cb and Cr */
    
        for (y = 0; y &lt; c->height / 2; y++) {
    
            for (x = 0; x &lt; 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;
    
            }
    
        }
    
        frame->pts = i;
    
        /* encode the image */
    
        ret = avcodec_send_frame(c, frame);
    
        ret = avcodec_receive_packet(c, &amp;pkt);
    

    
        if (ret == AVERROR_EOF) {
    
            got_output = false;
    
            printf("Stream EOF\n");
    
        } else if(ret == AVERROR(EAGAIN)) {
    
            got_output = false;
    
            printf("Stream EAGAIN\n");
    
        } else {
    
            got_output = true;
    
        }
    

    
        if (got_output) {
    
            printf("Write frame %3d (size=%5d)\n", j++, pkt.size);
    
            av_interleaved_write_frame(avfctx, &amp;pkt);
    
            av_packet_unref(&amp;pkt);
    
        }
    

    
        Sleep(40);
    
    }
    

    
    // end
    
    ret = avcodec_send_frame(c, NULL);
    

    
    /* get the delayed frames */
    
    for (; ; i++) {
    
        fflush(stdout);
    
        ret = avcodec_receive_packet(c, &amp;pkt);
    
        if (ret == AVERROR_EOF) {
    
            printf("Stream EOF\n");
    
            break;
    
        } else if (ret == AVERROR(EAGAIN)) {
    
            printf("Stream EAGAIN\n");
    
            got_output = false;
    
        } else {
    
            got_output = true;
    
        }
    

    
        if (got_output) {
    
            printf("Write frame %3d (size=%5d)\n", j++, pkt.size);
    
            av_interleaved_write_frame(avfctx, &amp;pkt);
    
            av_packet_unref(&amp;pkt);
    
        }
    
    }
    

    
    avcodec_close(c);
    
    av_free(c);
    
    av_freep(&amp;frame->data[0]);
    
    av_frame_free(&amp;frame);
    
    printf("\n");
    
    system("pause");
    
    return 0;
    
}

    However VLC (opened with the generated SDP file) isn’t able to play the stream. Messages has this

    core error: ES_OUT_RESET_PCR called

    followed by repeated

    packetizer_h264 warning: waiting for SPS/PPS
    
core debug: Buffering <some percent="percent">%
    
</some>

    What am I doing wrong ?

Navigation