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• ffmpeg SDP file for Darwin Streaming Server

  10 septembre 2012, par SP Sandhu

  I am making a streaming server to view live video feed of my webcam on my mobile device.

  I considered using ffmpeg , VLC and DSS and made the following setup that worked somewhat, though the frames were skipped :-

  video4linux2 > ffserver > VLC transcoding > DSS

  (RAW to ffserver) > (outputs to SDP link) > (SDP link to SDP file) > (SDP file to live streaming to mobile)

  Later, on testing VLC i found to be very inefficient and slow on my Netbook(Intel Atom N480) as it skips lot of frames.

  DSS can stream a SDP file from its /usr/local/movies(default).

  And at the same time, ffmpeg's ffserver module can stream live feed to SDP link(not SDP file).

  My requirement is that i need to create SDP file in DSS's /usr/local/movies directory so as to pass this DSS for streaming.

  So, how to create a sdp file from ffmpeg or how to create SDP file from SDP link (without using VLC's trans-coding).

  How to do that ?

• How to eliminate ffplay delay on a local network

  29 mai 2021, par Vigrond

  I am streaming audio from one computer to another on my local LAN.

  


  Server command :

  


  ffmpeg -re -f alsa -ac 2 -i default -fflags nobuffer -flags low_delay -sdp_file ~/sdp_stream -f rtp rtp://192.168.1.5:1234


  


  Client command :

  


  ffplay -fflags nobuffer -flags low_delay -nodisp -fast -framedrop -infbuf -protocol_whitelist rtp,file,udp sdp_stream


  


  This works with near-zero delay for a while, but after a bit the delay increases over time.

  


  My perception of delay is due to playing a YouTube video or Spotify on the server, and experiencing a delay on the client (both monitors in front of me).

  


  I am certain that it should be possible to set this up correctly with a near-zero delay on my local hardwired network, but I can't seem to find the correct setting in the FFmpeg documentation.

  


• Convert a video with unknown channels layout

  28 octobre 2020, par Thibault

  Well, here's my problem. I want to convert a .mov to a .mp4. Quite simple.

  


  But, my input : 1 video stream, 1 audio stream with 10 unknown channels layout

  


  Look at the MediaInfo :

  


  

  


  And what I want to get is a stereo .mp4 using a command like this :

  


  


  ffmpeg -i "input.mov" -vf fps=fps=23.976 -r 23.976 -vsync cfr -c:v libx264 -c:a aac -ac 2 "output.mp4"

  


  


  And it results :

  


  


  [aac @ 000002d305e453c0] Unsupported channel layout "0 channels"
Error initializing output stream 0:1 — Error while opening encoder for output stream #0:1 - maybe incorrect parameters such as bit_rate, rate, width or height
Conversion failed !

  


  


  I have tried such options like -filter_complex but can't fix this.

  


  Can you help ?

  


  EDIT

  


  I know now what are these channels layout. My goal is to get a stereo video but it would be easier for me to learn just how to "tag" them.

  


  Here's the audio info :

  


  

  1. Lt

  


  2. Rt

  


  3. Stereo M&E LT

  


  4. Stereo M&E Rt

  


  5. Left front

  


  6. Right Front

  


  7. Center

  


  8. LFE

  


  9. Ls

  


  


  10.Rs