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• FFMPEG : Remove silence with exact INTERVALS detected by silencedetect Filter

  29 mai 2021, par AfricanMamba

  I am trying to remove silence given the specific intervals given the output of the silencedetect filter. I recently read this post, but in my case, I want to use ONLY the intervals produced by the filter while using the same noise threshold. Here is what I have tried and the issues I am running into.

  


  After running the ffprobe :

  


  Input #0, wav, from 'audio.wav':
  Metadata:
    encoder         : Lavf58.76.100
  Duration: 00:00:56.21, bitrate: 1536 kb/s


  


  Here you can see that the video is exactly 56.21 seconds.

  


  After running silencedetect it produces an interval of silence with a threshold of -20dB :

  


  [silencedetect @ 000001dd38cead80] silence_start: 0
[silencedetect @ 000001dd38cead80] silence_end: 4.5631 | silence_duration: 4.5631
[silencedetect @ 000001dd38cead80] silence_start: 13.320
[silencedetect @ 000001dd38cead80] silence_end: 17.5232 | silence_duration: 4.2032


  


  After running this, I expected after using silenceremove, it would remove 8.7663 seconds of audio and the video would trim down to about 47.4437 seconds.

  


  The command silenceremove :

  


  ffmpeg -i audio.wav -af silenceremove=stop_periods=-1:stop_threshold=-20dB:window=0 output.wav


  


  After listening to the output I noticed that it cut out different regions of the audio that were not a part of the two intervals I was expecting it to remove. I ran the output in fprobe again to see the results :

  


  Input #0, wav, from 'output.wav':
  Metadata:
    encoder         : Lavf58.76.100
  Duration: 00:00:33.48, bitrate: 1536 kb/s


  


  It removed much more than the expected 8 seconds. Does anyone happen to know the command input parameters I need to use in order for it to only remove the intervals that it detected in silencedetect ? I do not think using duration will be the best tool because 1 : the two durations are different 2 : I am trying to create a program that removes the segments of silence automatically without me having to hard code it. Does anyone happen to know how I can solve this issue ? All help is appreciated !

  


• convert mms live audio stream with ffmpeg and upload on rackspace CDN [closed]

  28 mars 2013, par user584569

  im a complete newbie with ffmpeg. The following is the scenario

  I have an mms stream mms ://wms.di-ve.com/vibe which I cannot stream on mobile devices being Microsoft proprietary.
  I know that ffmpeg can do conversions to a stream. The idea is to feed this stream to ffmpeg and its output place it on Rackspace streaming CDN (see :http://www.rackspace.com/knowledge_center/product-faq/cloud-files)
  is this possible ? and if so, how can I do this ?

  Thanks

• ffmpegintrop namespace not recognized

  13 mars 2016, par Muhammad Touseef

  I used the sample ffmpegintrop project provided by Microsoft, I followed all steps of building and compilation and it was succesfully built. But then I tried to run the project it fails to build giving error : ’type or namespace ffmpegintrop cannot be resolved’. As you can see in the attached image below that using statement of the namespace is also giving error that it is not working. Please help.