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• ffmpeg nginx "Past duration ... too large" [duplicate]

  25 août 2017, par Philip Kirkbride

  This question already has an answer here :

  • What does ’Past duration X.XXX too large’ mean ?
    
    3 answers
    

  I have nginx compiled with the rtmp module. I start nginx and run the following to start streaming my webcam :

  ffmpeg -i /dev/video0 -f flv rtmp://localhost/live/test    

  Which works, I can then connect to my stream at rtmp://localhost/live/test

  The logs look like :

  frame=51 fps=34 q=31.0 size=203kB time=00:00:02.60 bitrate=638.9
  
  frame=66 fps=33 q=31.0 size=239kB time=00:00:03.10 bitrate=632.0 
  
  frame=82 fps=33 q=31.0 size=271kB time=00:00:03.63 bitrate=611.6
  
  ...

  With a new line being output every second or so. After streaming for 3-4 minutes I start getting logs like these about 5 per second :

  Past duration 0.987877 too large
  
  Past duration 0.911079 too large
  
  Past duration 0.949013 too large

  Despite the warnings the stream still seems to be live and working.

  I believe nginx is triggering the following ffmpeg command :

  exec ffmpeg -i rtmp://localhost:1935/encode/$name
  
    -c:a libfdk_aac -b:a 128k -c:v libx264 -b:v 1000k -f flv -g 30 -r 30 -s 854x480 -preset superfast -profile:v baseline rtmp://localhost:1935/live/$name
  
  ;

  Complete nginx.conf file.

  Does anyone know what this warning is referring to ?

• Extracting thumbnails with FFMPEG is super slow on large video files ? [duplicate]

  5 octobre 2015, par vaid

  This question already has an answer here :

  • Fastest way to extract a specific frame from a video (PHP/ffmpeg/anything)
    
    1 answer
    

  I extract thumbnails from a .MOV file using FFMPEG on Linus (Debian 64bit).

  The file I extract the thumbnail from is about 430 Megabytes large.

  I use the following command to do so :

  ffmpeg -i 'largeVideoFile.mov' -ss 00:14:37 -vframes 1 'thumbnail.jpg'

  It takes well over 3 minutes for a single frame to be extracted.

  How can I speed it up ?

• all : fix enum definition for large values

  23 octobre 2015, par Ganesh Ajjanagadde

  all : fix enum definition for large values
  ISO C restricts enumerator values to the range of int. Thus (for instance) 0x80000000
  
  unfortunately does not work, and throws a warning with -Wpedantic on
  
  clang 3.7.
  This fixes it by using alternative expressions that result in identical
  
  values but do not have this issue.
  Tested with FATE.
  Reviewed-by : Ronald S. Bultje <rsbultje@gmail.com>
  
  Reviewed-by : Michael Niedermayer <michael@niedermayer.cc>
  
  Signed-off-by : Ganesh Ajjanagadde <gajjanagadde@gmail.com>
  

  • [DH] libavcodec/dca_syncwords.h
  • [DH] libavformat/cinedec.c
  • [DH] libavformat/mov_chan.c