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• nginx-rtmp + ffmpeg move mp4's moov to head on the fly

  14 février 2017, par eddie.xie

  I have the following use case :

  1) Alice publish stream to the nginx-rtmp server

  2) The server convert the stream to mp4 (default is flv if I understand correctly, and a codec transformation is needed)

  3) Bob should be able to do range request to that mp4 file while Alice is still publishing

  However it seems ffmpeg command for converting a flv to mp4 can only be done when the mp4 file is fully generated, and then ffmpeg will do second pass and move "moov" to its new file’s head

  Our use case is to allow Bob use range request to retrive the mp4 file while Alice is still publishing (i.e. watch Alice’s video as soon as possible) from time 0 (i.e. from the second Alice started publishing). Thus with mp4’s moov at its head, it’s simple to do range requests and implement the functionality. Raw RTMP doesn’t seem to solve our problem, since we can’t let Bob watch from time 0 of Alice’s recording.

  The question is :
  1) Is it possible to do it while the flv is not fully generated yet ?
  2) Any other idea how shall we use nginx-rtmp/ffmpeg to achieve the functionality we desire ?

  Thanks a bunch

• FFMPEG (BASH) Trying to record stream from IP camera, getting really bad framerates and random stuttering in video

  12 février 2017, par user2419553

  I’m trying to record an .asf from my IP camera using FFMPEG to save it as an .mp4 file every 15 minutes. The stream coming from the camera is variable, but averages at around 10 FPS. However, when I watch the output mp4, the framerate is much lower, and there is often stuttering, random frame skips, and sometimes the video freezes and doesn’t play (on VLC player).

  Is there any way I can make the recording smoother and/or have less stuttering ?

  Here is the code that I use :

  ffmpeg -i http://USER:PASSWORD@IP:PORT/videostream.asf -r 10 -vcodec copy -an -t 900 /root/Record/"$(date +"%Y_%m_%d %I.%M %p")".mp4

  Any help would be appreciated.

• appending a string constant selectively within a while loop in bash

  29 janvier 2017, par Maxwell Chandler

  I have a script called automateutube that I edit in VIM and execute in the terminal with sh ./automateutube.sh This script pulls youtube links from a file called songs.txt and downloads the video from youtube then extracts the audio.

  The songs.txt file looks like this

  https://www.youtube.com/watch?v=IxQOlZ3pqtI
  
  https://www.youtube.com/watch?v=IxQOlZ3pqtI
  
  https://www.youtube.com/watch?v=IxQOlZ3pqtI
  
  https://www.youtube.com/watch?v=IxQOlZ3pqtI

  It is just a bunch of links, one per line.

  The script looks like this

  #!/bin/bash
  
  
  
  while read p; do    
  
  
  
  x=/tmp/.youtube-dl-$(date +%y.%m.%d_%H.%M.%S)-$RANDOM.flv
  
  
  
  youtube-dl --audio-quality 160k --output=$x --format=18 "$p"
  
  
  
  ffmpeg -i $x -acodec libmp3lame -ac 2 -ab 128k -vn -y "$p"
  
  
  
  rm $x
  
  
  
  done code>

  Now the first part executes. It downloads the video and starts to unpack it.

  It is the second part that fails. ffmpeg -i $x -acodec libmp3lame -ac 2 -ab 128k -vn -y "$p"

  This is because "$p" is supposed to be in format "filename.mp3" However as it is p takes the value of a youtube link, without ".mp3" appended.

  This works for the first line

  youtube-dl --audio-quality 160k --output=$x --format=18 "$p"

  because "$p" is supposed to be in the form of a link there.

  Now I have tried adding three lines in

  a="$.mp3"
  
  b="$p"
  
  c=$b$a

  and making ffmpeg -i $x -acodec libmp3lame -ac 2 -ab 128k -vn -y "$p"

  into ffmpeg -i $x -acodec libmp3lame -ac 2 -ab 128k -vn -y "$c"

  but I am still getting an error. Any ideas ?

  parse error, at least 3 arguments were expected, only 1 given in string ’om/watch ?v=sOAHOxbMOJY’