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• Will ffmpeg transcoding change the media's duration ?

  6 juillet 2012, par MaiTiano

  For example, I have a example flv media : 1775818137_1775828481_10344.flv. Only audio data has contained in it. (No video data)

  The major properties of this flv are :

  _____________________________________________________________________
  
  Format                                   : Flash Video
  
  
  
  File size                                : 87.4 KiB
  
  
  
  Duration                                 : 494 hours
  
  
  
  Overall bit rate mode                    : CBR
  
  
  
  Overall bit rate                         : 0 bps
  
  
  
  Writing application                      : Lavf53.4.0
  
  
  
  Audio
  
  
  
  Format                                   : MPEG Audio
  
  
  
  Format version                           : Version 1
  
  
  
  Format profile                           : Layer 3
  
  
  
  Mode                                     : Joint stereo
  
  
  
  Mode extension                           : MS Stereo
  
  
  
  Codec ID                                 : 2
  
  
  
  Codec ID/Hint                            : MP3
  
  
  
  Duration                                 : 49hours
  
  
  
  Bit rate mode                            : CBR
  
  
  
  Bit rate                                 : 64.0 Kbps
  
  
  
  Channel(s)                               : 2 channels
  
  
  
  Sampling rate                            : 44.1 KHz
  
  
  
  Compression mode                         : Lossy
  
  
  
  Stream size                              : 13.3 GiB
  
  
  
  _____________________________________________________________________

  Because this is the flv piece generated from the Suse10.0 server, the timestamp may be not correctly wrote into the flv metadata. Therefore, the Duration item listed above is not the real time of it.
  I has record the time in its file name.
  So, the beginning time is 1775818137 ms
  the ending time of this flv is 1775828481 ms
  The actual duation of this flv is 10344 ms which is about 10 seconds.

  **HERE IS MY QUESTION -.- **

  When I use ffmpeg to transcode flv fromat into ts format, like this,

  ./ffmpeg -i 1775818137_1775828481_10344.flv -f mpegts -vn -acodec libfaac -ar 44100 -ab 48k 1775818137_1775828481_10344.ts

  Is there possibility that the duration of final gotten ts file is not equal to the duation of original flv file ? In other words, the ts file's duration is not 10344ms.

• Live streaming Rmtp node-media-server real server not creating video files but wont fail (OBS)

  3 octobre 2020, par Orgil

  I have made a live streaming server with node-media-server and it works well in local but when i put it on a real server (ubuntu, nginx) its just creating the folder but not creating video files and no errors given OBS the streaming sofware not failing. is it something to do with ffmpeg ? maybe needed packages didnt install or ? idk whats going on :D

  


  Cofig of node-media-server :

  


  rtmp_server: {
    rtmp: {
        port: 1935,
        chunk_size: 60000,
        gop_cache: false,
        ping: 60,
        ping_timeout: 30
    },
    http: {
        port: 8088,
        mediaroot: '/home/ubuntu/projects/amjilt_media/media',
        allow_origin: '*'
    },
    trans: {
        ffmpeg: '/usr/bin/ffmpeg',
        // ffmpeg: 'C:/Users/User/Desktop/ffmpeg/bin/ffmpeg.exe',
        tasks: [
            {
                app: 'live',
                hls: true,
                hlsFlags: '[hls_time=2:hls_list_size=3:hls_flags=delete_segments]',
                dash: true,
                dashFlags: '[f=dash:window_size=3:extra_window_size=5]'
            }
        ]
    }
}


  


• How to prepare media stream to play using dash.js web player ?

  7 avril 2016, par Paweł Tobiszewski

  I want to stream media from nginx server to Android device and play it using web player embedded into web page. Player I want to use is dash.js.
  I play the same media also using different methods (MediaPlayer and ExoPlayer) and they are working great. But when I try to use dash.js, I faced problem with codecs - they are not supported.
  I prepare my streams using ffmpeg and MP4Box, I also tried different codecs, like libx264, x264, x265 - always with the same effect.
  My based media are video in Y4M format and audio in WAV.
  How to encode it to use it in dash.js player ?

  EDIT :
  I get error "Video Element Error : MEDIA_ERR_DECODE" while trying to decode video stream.

  Here is full log :

  [16] EME detected on this user agent! (ProtectionModel_21Jan2015) 
  
  [19] Playback Initialized 
  
  [28] [dash.js 2.0.0] MediaPlayer has been initialized 
  
  [102] Parsing complete: ( xml2json: 3ms, objectiron: 3ms, total: 0.006s) 
  
  [103] Manifest has been refreshed at Thu Apr 07 2016 22:02:52 GMT+0200 (CEST)[1460059372.696]  
  
  [107] SegmentTimeline detected using calculated Live Edge Time 
  
  [118] MediaSource is open! 
  
  [118] [object Event] 
  
  [119] Duration successfully set to: 18.58 
  
  [119] Added 0 inline events 
  
  [120] video codec: video/mp4;codecs="avc1.640032" 
  
  [132] Schedule controller stopping for video 
  
  [137] No audio data. 
  
  [137] No text data. 
  
  [137] No fragmentedText data. 
  
  [137] No embeddedText data. 
  
  [138] No muxed data. 
  
  [139] Start Event Controller 
  
  [141] Schedule controller starting for video 
  
  [143] Native video element event: play 
  
  [144] Schedule controller starting for video 
  
  [148] loaded video:InitializationSegment:NaN (200, 0ms, 7ms) 
  
  [149] Initialization finished loading 
  
  [154] Getting the request for video time : 0 
  
  [155] SegmentList: 0 / 18.58 
  
  [164] loaded video:MediaSegment:0 (200, 7ms, 1ms) 
  
  [169] Native video element event: loadedmetadata 
  
  [171] Starting playback at offset: 0 
  
  [175] Got enough buffer to start. 
  
  [175] Buffered Range: 0 - 0.999999 
  
  [179] Requesting seek to time: 0 
  
  [181] Prior to making a request for time, NextFragmentRequestRule is aligning index handler's currentTime with bufferedRange.end. 0  was changed to  0.999999 
  
  [182] Getting the request for video time : 0.999999 
  
  [183] SegmentList: 0 / 18.58 
  
  [183] Getting the next request at index: 1 
  
  [184] SegmentList: 1 / 18.58 
  
  [190] loaded video:MediaSegment:1 (200, 5ms, 0ms) 
  
  [192] Buffered Range: 0 - 0.999999 
  
  [195] Getting the request for video time : 2 
  
  [196] Index for video time 2 is 1 
  
  [197] SegmentList: 1 / 18.58 
  
  [197] Getting the next request at index: 2 
  
  [198] SegmentList: 2 / 18.58 
  
  [205] loaded video:MediaSegment:2 (200, 4ms, 1ms) 
  
  [207] Buffered Range: 0 - 0.999999 
  
  [207] Getting the request for video time : 3 
  
  [208] Index for video time 3 is 2 
  
  [208] SegmentList: 2 / 18.58 
  
  [209] Getting the next request at index: 3 
  
  [209] SegmentList: 3 / 18.58 
  
  [212] Video Element Error: MEDIA_ERR_DECODE 
  
  [212] [object MediaError] 
  
  [215] Schedule controller stopping for video 
  
  [219] Native video element event: pause