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• lavu/libm : add exp10 support

  22 décembre 2015, par Ganesh Ajjanagadde

  lavu/libm : add exp10 support
  exp10 is a function available in GNU libm. Looks like no other common
  
  libm has it. This adds support for it to FFmpeg.
  There are essentially 2 ways of handling the fallback :
  
  1. Using pow(10, x)
  
  2. Using exp2(M_LOG2_10 * x).
  First one represents a Pareto improvement, with no speed or accuracy
  
  regression anywhere, but speed improvement limited to GNU libm.
  Second one represents a slight accuracy loss (relative error 1e-13)
  
  for non GNU libm. Speedup of > 2x is obtained on non GNU libm platforms,
  
   30% on GNU libm. These are "average case numbers", another benefit is
  
  the lack of triggering of the well-known terrible worst case paths
  
  through pow.
  Based on reviews, second one chosen. Comment added accordingly.
  Reviewed-by : Hendrik Leppkes <h.leppkes@gmail.com>
  
  Reviewed-by : Michael Niedermayer <michael@niedermayer.cc>
  
  Reviewed-by : Ronald S. Bultje <rsbultje@gmail.com>
  
  Signed-off-by : Ganesh Ajjanagadde <gajjanagadde@gmail.com>
  

  • [DH] configure
  • [DH] libavutil/libm.h

• ffmpwg failed with code 1 at ChildProcess

  13 janvier 2021, par awabs

  I am trying to add a watermark over the a video in firebase storage using firebase functions and ffmpeg,
but no matter what I try it always exit the same error.

  


   return spawn('ffmpeg', ['-i', tmpFilePath, '-vf',`drawtext="text='hello World'`, tmpFilePath]);


  


  And I tried this as well :

  


          return spawn('ffmpeg', ['-i', tmpFilePath, '-i', tmpLogoPath, '-filter_complex', '"overlay=10:10"', tmpFilePath]);


  


  console log :

  


  ChildProcessError: `ffmpeg -i /tmp/anything -vf drawtext="text=&#x27;Stack Overflow&#x27; /tmp/anything` failed with code 1&#xA;at ChildProcess.<anonymous> (/workspace/node_modules/child-process-promise/lib/index.js:132:23)&#xA;at ChildProcess.emit (events.js:315:20)&#xA;at ChildProcess.EventEmitter.emit (domain.js:506:15)&#xA;at maybeClose (internal/child_process.js:1021:16)&#xA;at Socket.<anonymous> (internal/child_process.js:443:11)&#xA;at Socket.emit (events.js:315:20)&#xA;at Socket.EventEmitter.emit (domain.js:506:15)&#xA;at Pipe.<anonymous> (net.js:674:12)&#xA;at Pipe.callbackTrampoline (internal/async_hooks.js:120:14)&#xA;</anonymous></anonymous></anonymous>

  


• Not able to configure FFserver for RTSP

  2 novembre 2015, par Sujith

  I am kind of new to the streaming world... so, please forgive me if I ask kind of dumb question.

  I am trying to stream my pre-recorded file over RTSP through FFserver.

  My config file is :

  RTSPPort 8544
  
  <feed>
  
      File /home/xyz/tmp/feed2.ffm
  
      FileMaxSize 200K
  
      ACL allow 127.0.0.1
  
  </feed>
  
  
  
  <stream>
  
      Feed feed2.ffm
  
      Format rtsp
  
      VideoFrameRate 15
  
      VideoSize 352x240
  
      VideoBitRate 256
  
      VideoBufferSize 40
  
      VideoGopSize 30
  
      AudioBitRate 64
  
      StartSendOnKey
  
  </stream>

  After starting the server, it give the below log :

  $ ./ffserver -f doc/ffserver.conf
  
  ffserver version 0.11.1 Copyright (c) 2000-2012 the FFmpeg developers
  
  built on Sep 17 2012 19:46:38 with gcc 4.1.2 20080704 (Red Hat 4.1.2-52)
  
  configuration: --enable-gpl --enable-libmp3lame --enable-libtheora --enable-libvo-aacenc 
  
  -enable-libvorbis --enable-libvpx --enable-libx264 --enable-version3
  
  libavutil 51. 54.100 / 51. 54.100
  
  libavcodec 54. 23.100 / 54. 23.100
  
  libavformat 54. 6.100 / 54. 6.100
  
  libavdevice 54. 0.100 / 54. 0.100
  
  libavfilter 2. 77.100 / 2. 77.100
  
  libswscale 2. 1.100 / 2. 1.100
  
  libswresample 0. 15.100 / 0. 15.100
  
  libpostproc 52. 0.100 / 52. 0.100
  
  Wed Sep 19 17:03:32 2012 FFserver started.

  And now from my VLC client I am trying to type the URL : rtsp ://xxx.xxx.xxx.xxx:8554/test.sdp

  But, what happens is that, there is no response on the ffserver.

  I have no clue what might be the problem. Thanks in advance.