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• Waiting between FFMPEG scripts when creating .hdr/.chk and .mpd files on NGINX server using RTMP module

  17 avril 2020, par Mathew Knight

  Wonder if anyone might be able to suggest a solution to and issue i'm having.

  



  I'm running some FFMPEG scripts inside a RTMP server block on an NGINX server running on Ubuntu 18.04.

  



  Basically i'm ingesting the RTMP stream to the server then using FFMPEG to Demux into separate audio and video header and chunk files, then in separate scripts i'm creating two separate manifests for both the audio and video.

  



  The player i have (a development ambisonic, 360 video player) is having problems reading the stream correctly and i believe this is due to the FFMPEG process for the manifests not waiting 2 seconds before running.

  



  Is there a way to program a wait in between the scripts to facilitate this ?

  



  furthermore, is there a way to make the manifest scripts only run once then quit ?

  



  heres my current NGINX .conf

  



  user root;
#user www-data;
worker_processes 1;
pid /run/nginx.pid;
include /etc/nginx/modules-enabled/*.conf;
events {
    worker_connections 768;
    # multi_accept on;
}
http {
    ##
    # Basic Settings
    ##
    sendfile on;
    tcp_nopush on;
    tcp_nodelay on;
    keepalive_timeout 65;
    types_hash_max_size 2048;
    # server_tokens off;
    # server_names_hash_bucket_size 64;
    # server_name_in_redirect off;
    include /etc/nginx/mime.types;
    default_type application/octet-stream;
    ##
    # SSL Settings
    ##
    #ssl_protocols TLSv1 TLSv1.1 TLSv1.2; # Dropping SSLv3, ref: POODLE
    #ssl_prefer_server_ciphers on;
    ##
    # Logging Settings
    ##
    access_log /var/log/nginx/access.log;
    error_log /var/log/nginx/error.log;
    ##
    # Gzip Settings
    ##
    ##
    # Virtual Host Configs
    ##
    include /etc/nginx/conf.d/*.conf;
    include /etc/nginx/sites-enabled/*;
}
rtmp {
        server {
            listen 1935;
            chunk_size 4096;

            application live {
            live on;
            record off;
            interleave off;
            wait_key on;
            meta on;
            wait_video off;
            idle_streams off;
            sync 300ms;
            session_relay on;
            #allow publish 127.0.0.1;
            #allow publish 192.168.2.0/24;
            allow publish all;
            #deny publish all;
            allow play all;    
        #RX stream to FFMPEG, demux audio and video, write .hdr files, start chunking DASH segments .chk
         exec_push sudo ffmpeg -y -re -i 'rtmp://localhost:1935/live/stream' -map 0:1 -pix_fmt yuv420p -maxrate 750k -bufsize 3000k -c:v libvpx-vp9 -s 1920x1080 -keyint_min 60 -g 60 -speed 6 -tile-columns 4 -frame-parallel 1 -threads 8 -static-thresh 0 -max-intra-rate 300 -deadline realtime -lag-in-frames 0 -error-resilient 1 -b:v 6000k -f webm_chunk -header "/var/www/html/dash/video_360.hdr" -chunk_start_index 1 "/var/www/html/dash/video_360_%d.chk" -map 0:2 -c:a libopus -mapping_family 255 -b:a 1024k -vn -f webm_chunk -audio_chunk_duration 2000 -header "/var/www/html/dash/audio_171.hdr" -chunk_start_index 1 "/var/www/html/dash/audio_171_%d.chk" 2>>/var/log/nginx/ffmpegChunk.log;

        #Create video manifest
        exec_push sudo ffmpeg -probesize 500M -analyzeduration 100M -f webm_dash_manifest -live 1 -i "/var/www/html/dash/video_360.hdr" -map 0 -c copy -f webm_dash_manifest -live 1 -adaptation_sets "id=0,streams=0" -chunk_start_index 1 -chunk_duration_ms 2000 -minimum_update_period 7200 "/var/www/html/dash/video.mpd" 2>>/var/log/nginx/ffmpegManifestVideo.log;
        #Create audio manifest
        exec_push sudo ffmpeg -probesize 500M -analyzeduration 100M -f webm_dash_manifest -live 1 -i "/var/www/html/dash/audio_171.hdr" -map 0 -c libopus -mapping_family 255 -f webm_dash_manifest -live 1 -adaptation_sets "id=1,streams=0" -chunk_start_index 1 -chunk_duration_ms 2000 -minimum_update_period 7200 "/var/www/html/dash/audio_16ch.mpd" 2>>/var/log/nginx/ffmpegManifestAudio.log;

        ##
        # Record the incoming stream
        ##
        # Record audio and video together
        record all;
        record_path /home/mathewknight/Desktop/StreamRecord/Master;
        record_notify on;
        # Record audio seperately
        recorder audio {
            record audio;
            record_path /home/mathewknight/Desktop/StreamRecord/Audio;
            record_suffix -%d-%b-%y-%T.audio.flv;
            record_notify on;
            }
        # Record video seperately
        recorder video{
            record video;
            record_path /home/mathewknight/Desktop/StreamRecord/Video;
            record_suffix -%d-%b-%y-%T.video.flv;
            record_notify on;
            }

            }


        }

}



  


• Exception thrown at 0x7C2E6005 (swscale-5.dll) in Video_playing.exe : 0xC0000005 : Access violation reading location 0xCCCCCD04 [closed]

  11 mai 2020, par jatin yadav

  Trying to play a video using GLFW and FFmpeg on visual studio 2019 on windows 10.

  



  Exception is thrown at sws_scale(sws_scaler_ctx, av_frame->data, av_frame->linesize, 0, av_frame->height, dest, dest_linesize) ; in the code. Don't know why this is occurred. Please Help !!

  



  #include "video_reader.h"
#include 

bool video_reader_read_frame(VideoReaderState* state, uint8_t* frame_buffer, int64_t* pts) {

    // Unpack members of state
    auto& width = state->width;
    auto& height = state->height;
    auto& av_format_ctx = state->av_format_ctx;
    auto& av_codec_ctx = state->av_codec_ctx;
    auto& video_stream_index = state->video_stream_index;
    auto& av_frame = state->av_frame;
    auto& av_packet = state->av_packet;
    auto& sws_scaler_ctx = state->sws_scaler_ctx;

    // Decode one frame
    int response;
    while (av_read_frame(av_format_ctx, av_packet) >= 0) {
        if (av_packet->stream_index != video_stream_index) {
            av_packet_unref(av_packet);
            continue;
        }

        response = avcodec_send_packet(av_codec_ctx, av_packet);
        if (response < 0) {
            printf("Failed to decode packet: %s\n", response);
            return false;
        }

        response = avcodec_receive_frame(av_codec_ctx, av_frame);
        if (response == AVERROR(EAGAIN) || response == AVERROR_EOF) {
            av_packet_unref(av_packet);
            continue;
        }
        else if (response < 0) {
            printf("Failed to decode packet: %s\n", response);
            return false;
        }

        av_packet_unref(av_packet);
        break;
    }

    *pts = av_frame->pts;

    // Set up sws scaler
    if (!sws_scaler_ctx) {
        sws_scaler_ctx = sws_getContext(width, height, av_codec_ctx->pix_fmt,
            width, height, AV_PIX_FMT_RGB0,
            SWS_BILINEAR, NULL, NULL, NULL);
    }
    if (!sws_scaler_ctx) {
        printf("Couldn't initialize sw scaler\n");
        return false;
    }

    uint8_t* dest[4] = { frame_buffer, NULL, NULL, NULL };
    int dest_linesize[4] = { width * 4, 0, 0, 0 };
    sws_scale(sws_scaler_ctx, av_frame->data, av_frame->linesize, 0, av_frame->height, dest, dest_linesize);

    return true;
}


  


• Why does it say error finding module when I already installed it

  13 mai 2020, par MiqhtieLol

  I am trying to code a discord music bot and this is my code :

  



  const config = require('config.json')
const Discord = require('discord.js');
const ffmpeg = require('ffmpeg-extra')
const client = new Discord.Client();

client.once('ready', () => {
    console.log('Ready!');
});
client.on('message', message => {
    if(message.content.toLocaleLowerCase() === "elevator"){
        if(message.member.voice.channel){
            message.channel.send("Thanks to https://www.bensound.com for supplying us with this music.")
            play(message.member.voice.channel)
        }
        else {
            message.channel.send("Yo, please join a VC first.")
        }
    }
});

async function play(voiceChannel) {
    const connection = await voiceChannel.join();
    connection.play('elevator.mp3');
}

client.login(config.token);


  



  For some reason even though I installed ffmpeg via npm install ffmpeg it says :

  



  Error: Cannot find module 'ffmpeg-extra'


  



  EDIT : When I use const ffmpeg = require("ffmpeg") I get this error :

  



  UnhandledPromiseRejectionWarning: Error: FFmpeg/avconv not found!