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• How to create videos with small file size but large resolution ?

  13 février 2017, par Gregory Magarshak

  Is there a programmatic way to create videos that capture, essentially, a powerpoint presentation, that would be not much larger than the audio + screenshots of the powerpoint itself ?

  I want to make software that produces videos with the full resolution of a powerpoint on a large screen, and with a person speaking over it and wvwn doodling. Kind of like "bcontext" software. And then I want to export videos for youtube and other places to be hosted. But I want them to be SMALL. So they can be downloaded by people with slow connections eg in India.

  What factors can affect video size and how can i take advantage of the relative "stillness" of most pixels at most times to make the compression preserve the full sharpness and yet take advantage of the lack of visual changes ? What software do you recommend ?

• Extract Progress tone from Audio file

  15 février 2017, par spicyramen

  Is there a way to extract Progress tone frequency and duration from an audio file (Audacity, VLC, ffmpeg, etc.)

  I need to configure Freeswitch spandsp.conf.xml for India.

  I collected the audio file where I can hear the tone, wondering if there is a tool to extract and configure the settings required in Freeswitch.

  Current non-working config :

     
  
       <descriptor>
  
          <tone>
  
           <element freq1="2100" freq2="0" min="700" max="0"></element>
  
          </tone>
  
          <tone>
  
       <element freq1="400" freq2="0" min="384" max="400"></element>
  
           <element freq1="0" freq2="0" min="200" max="224"></element>
  
           <element freq1="400" freq2="0" min="384" max="400"></element>
  
           <element freq1="0" freq2="0" min="1968" max="1984"></element>
  
      </tone>
  
          <tone>
  
           <element freq1="425" freq2="0" min="256" max="272"></element>
  
           <element freq1="0" freq2="0" min="240" max="256"></element>
  
           <element freq1="425" freq2="0" min="256" max="272"></element>
  
           <element freq1="0" freq2="0" min="224" max="240"></element>
  
      </tone>
  
          <tone>
  
           <element freq1="400" freq2="0" min="700" max="760"></element>
  
           <element freq1="0" freq2="0" min="700" max="760"></element>
  
           <element freq1="400" freq2="0" min="700" max="760"></element>
  
           <element freq1="0" freq2="0" min="700" max="760"></element> 
  
      </tone>
  
       </descriptor>

  Image of progress tone.

  

• requesting script for compressing mp3 files recursively using ffmpeg

  3 mai 2017, par Guddla Rupesh

  Hi I am Rupesh from India. I have a directory of size 65 GB which contains 2500 folders and 7000 mp3 files with 64 kbps bitrate.

  I have installed Windows 8 and Linux with ffmpeg on my system.

  I want to convert all these files to 16 kbps recursively I mean maintain folder structure of source. I have searched web for script and found some code but none of them provided what I want. I have searched even GUI frontend for ffmpeg and found some software but they don’t have option to convert all these files recursively and some don’t have option to convert to lower bitrate.

  I have read ffmpeg manual pages and those was difficult to understand and even I don’t have scripting experience.

  Can you create a script to perform the following steps
  1) The script must compress files in each and every directory maintaining directory structure.
  2) All files must be compressed to 16 kbps and 11500 samples per second with highest quality.
  3) If any errors are encountered during the process the corresponding file information ie., file name with path must be stored in a seperate text file for future viewing.
  4) After the process has been completed the system must shutdown.

  I want accurate compression. Please try to create a bash script ( linux ) or a batch script ( Windows ) and post the script.

  Regards,
  Rupesh.