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• copy step written on stackoverflow to install FFMPEG on wamp not working

  17 septembre 2019, par user3833682

  I’m working on project for converting youtube videos into mp3 format and found this also to install ffmpeg on wamp server Install FFMPEG on WAMP and try other links also but ffmpeg extension is not installing so I also checked it at phpinfo to confirm its installed or not but not installed and I’ve windows 7 64, wampserver 2.4, apache 2.4.4 and php version is 5.4.12 I don’t know what am I missing, I spent my 6 hours to figure out but extension of ffmpeg is not installed yet please tell me what am I doing wrong ?

  Now after that I’m getting popup message twice when I start wamp server `PHP Startup : Unable to load dynamic library

  c :/wamp/bin/php/php5.4.12/ext/php_ffmpeg.dll’ - %1 is not a valid
  Win32 application.

  

• automatically run script recording video at interval using command line and ffmpg

  29 décembre 2014, par arrie

  I’m really a beginner noob newbie command line noob. But. I’m trying to create a script that automatically starts my isight camera when turning on my mac laptop. It should create clips of about 5 seconds at an interval of 5 hours or so. (These numbers I can change of course later on if I have the basis for my script).

  So what I in fact need is (i think) a launch script, that launches a video recording script.

  Right now I’m as far as my video recording script, which is not finished : camera.sh

  #!/bin/bash
  
  
  
  FNAME=videocapture_`date +"%F_%H_%M"`.mpg
  
  echo $FNAME
  
  
  
  ffmpeg -f -t "0.20avfoundation -i "" $FNAME

  ---

  This in fact records a video when I play the script in the command line, until I tell it to quit. These videos are then named according to the date etc. But of course I want it to automatically record videos, in an already determined duration. And I just can’t seem to figure out how to make it happen. I come back to different kind of scripts using isight capture, which in fact doesn’t seem to exist anymore, and even so, I would like to stay with my own basis script just because I understand it haha.

  Hopefully someone here can help me figure this out ! Much appreciated :) Thanks !

• Scenecut detection and consistent GOP size - adaptive streaming

  24 mars 2014, par Tarun

  Sample Command :

  -map 0:0 -f mp4 -vcodec libx264 -preset slow -profile:v main -vf scale="640:trunc(ow/a/2)*2" -vb 700k -minrate 650k -maxrate 750k -bufsize 10000k -an -g 48 -x264opts keyint=48:min-keyint=10:scenecut=40 -flags +cgop -sc_threshold 40 -pix_fmt yuv420p -threads 0 -y

  There is as such no error in encoding, But I wanted to understand following points-

  1) the above command will ensure that range of GOP size is 10,48, and if any scene change value (frame1 to fame2) is >40%, then a keyframe is introduced there ?

  2) So that means in a 3 hours of source video, there is no guarantee that GOP size will remain same

  3) No consider, I am creating 7 MP4 files each with different bitrate and resolution. (These Mp4s will be encoded to smooth in later stage). Hence i am targeting adaptive streaming. But when I did that, I found that if GOP sizes were not consistent across each bitrates. What I mean by this is, for ex : if in Bitrate1 - GOP size is like 10, 20, 48 and so on, in other bitrates it wasnt in the same sequence. I hope my question makes sense.

  So is there a way to ensure that GOP size may vary across one single output. But it should be consistent across each bitrate provided that the source is same ?

  Also for adaptive streaming Is scenecut detection advisable ?