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• lavf : Add WebM DASH Manifest Muxer

  14 juillet 2014, par Vignesh Venkatasubramanian

  lavf : Add WebM DASH Manifest Muxer
  This patch adds the ability to generate WebM DASH manifest XML using
  
  ffmpeg. A sample command line would be as follows :
  ffmpeg \
  
    -f webm_dash_manifest -i video1.webm \
  
    -f webm_dash_manifest -i video2.webm \
  
    -f webm_dash_manifest -i audio1.webm \
  
    -f webm_dash_manifest -i audio2.webm \
  
    -map 0 -map 1 -map 2 -map 3 \
  
    -c copy \
  
    -f webm_dash_manifest \
  
    -adaptation_sets “id=0,streams=0,1 id=1,streams=2,3” \
  
    manifest.xml
  It works by exporting necessary fields as metadata tags in matroskadec
  
  and use those values to write the appropriate XML fields as per the WebM
  
  DASH Specification [1]. Some ideas are adopted from webm-tools project
  
  [2].
  [1]
  
  https://sites.google.com/a/webmproject.org/wiki/adaptive-streaming/webm-dash-specification
  
  [2]
  
  https://chromium.googlesource.com/webm/webm-tools/+/master/webm_dash_manifest/
  Signed-off-by : Vignesh Venkatasubramanian <vigneshv@google.com>
  
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] Changelog
  • [DH] RELEASE_NOTES
  • [DH] doc/muxers.texi
  • [DH] libavformat/Makefile
  • [DH] libavformat/allformats.c
  • [DH] libavformat/version.h
  • [DH] libavformat/webmdashenc.c

• ffmpeg - Seek to absolute time stamp in MPEG DASH segment [closed]

  30 mai 2024, par iBent

  I need to extract short audio segments at specific time stamps from specific dash segments.

  


  I tried the following :

  


  ffmpeg -ss 00:10:00 -i segment_x.m4s -t 10 out.mp3


  


  -ss seeks relative to the segment's start time however, and not absolutely.
That absolute time data is there however as ffmpeg prints it during the conversation like this :

  


  Duration: 00:10:14.01, start: 595.018667, bitrate: 7 kb/s


  


  How can I make ffmpeg extract the audio from exactly 00:10:00 to 00:10:10 ?

  


• Live video streaming with Node js ,HTML5, MPEG-DASH, FFMPEG and IP camera/Raspberry Pi

  12 mai 2016, par sparks

  I am a programmer but i am very new in live video streaming concepts.I need help

  What i want to accomplish

  I want to develop an online live video streaming system.The scenario is i would have a device or number of devices(raspberry pi & camera only OR ip camera only ...not sure yet) to capture the video and stream the video live in real time remotely to my web app.Multiple clients can connect to the web app and watch the video live.The key things to note here, is that these devices should be wireless(able to connect to internet and live stream the content) and also i want to eliminate the idea of manually configuring the ip adrress to local WIFI router.So simply i turn on the device and it start streaming right away to the web app.

  Infrastructure, Platforms,Browsers, Streaming methods and formats

  In the beginning i just want to stream though chrome web browser(that’s all i care about).But in the future i would build android and IOS mobile apps.So long term i would expect to be Chrome and mobile(Android & IOS platforms)
  So based on my research i learned that the client should be HTML5, streaming method MPEG-DASH(In the future add HLS), the web app will be in Node Js.I also came across Dash.js for Html5.

  My understanding of streaming based on my research

  I also came across things like FFMPEG,Dash encoder and wowza which i am not clear about.Now correct me if i am wrong, my understanding is that FFMPEG get hold of the device/camera and the content(i am not sure the format of the content at this point)and format it(i am not sure what this means in simple english) and then Dash encoder picks up and re-format the content to MPEG-DASH format, which produces MPD and then Dash.js client uses MPD to display the video to the browser.

  QUESTIONS

  1. First correct me if i am wrong based on my understanding above or
     clarify for me.Also I am not sure of where the wowza streaming
     engine come into play. Do i even need it ?

  2. I am not sure of the devices to use between Raspberry pi with camera
     module/ Or IP Wifi camera by itself.I know with raspberry pi
     connected to internet you can set up all the necessary programs and
     stream the video to web app directly(not sure about quality and
     performance) but I am not sure about Wifi camera.Is it possible to
     connect to the wifi camera remotely from the web app programatically
     without opening the wifi router portal manually or i should stick
     with Raspbery Pi ?

  3. For raspberry Pi would i be able to connect it with high quality
     picture IP camera/web cam ? (The point here to get the best picture
     through raspbery Pi)

     My expectations

     Better performance and quality would be great.But i know live streaming is not easy so i am willing to compromise performance to a point but not quality.

  Thank you in advance, Anything will be appreciated.I know this is a lot so take your time :)