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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.

  

• Customizing HomeKit (using HomeBridge plug-in or building custom app ?)

  5 mai 2019, par Fréderic Cox

  I am running HomeBridge on a RBPi3 and displaying my home accessories through an iPad hub running the Home app.

  I really like it but I’m missing some things like a big clock (The iPad is hanging on my kitchen wall with screen-on display most of the day), a summary of my Google Calendar and some other nice widgets. It is not possible to add those widgets to the Home app (typically so with Apple software .. :-)) but I’m looking for a solution to achieve this.

  I have two options (at least that’s what I think) :

  1) Build my own iPad using the HomeKit API where I can then customize the app appearance and add the widgets the way I want.

  2) Using HomeBridge FFMpeg camera plugin and creating a video stream containing a big clock and some calendar item titles.

  Option 1 is the most work but also provides the flexibility. Option 2 is easier but limited in functionality. Option 2 might also be a performance overkill to have a video stream ? The video stream would provide me with the advantage that the camera widget in HomeKit is pretty big and clearly visible from distance (the clock at least).

  What do you think is the best option and how would option 2 be achieved ? How can I set up a video stream from for example a SWF file created in Adobe Animate ? Or how to achieve this dynamic info inside a video stream ?

  Any tips are most welcome ! Thanks

• How the ffmpeg astats crest factor is calculated

  30 août 2017, par FranGar

  I’m scripting a ffmpeg chain process for my work. The aim is normalizing/compressing lot of audio files (mp3’s).
  It’s done in Python and the critical part is the line :

  ffmpeg -y -i "Input.mp3" -codec:a libmp3lame -b:a 96k -af acompressor=threshold=-15dB:ratio=5:attack=0.01:release=1000:knee=2,dynaudnorm=g=3:m=2:p=0.95 "Output.mp3"

  The python script it’s complete and working BUT the nature of the audios (voice recordings) are very different so I can’t use the same params for all of them.

  I make some experimenting with the values of the ffmpeg filter astats and i discovered that the crest factor (Standard ratio of peak to RMS level ) gave a good reference to programatically get the better params.

  In fact I saw that a recording with a nice dynamic range sound and smooth in shape, get crest values around 9-15 (the compress/normlz params will be somehow conservative). But audios with crest around 22-30 need more aggressive processing.
  (All empirically)

  Somebody can clarify how the crest values are really calculated ? Which are the peaks taken to account ? (Why the flat factor is always 0 ?)
  Or if somebody knows how to get a value representing the sound ’smoothness’ will be nice also.

  Thanks for the ideas.