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• How to mimic Audacity's "truncate silence" with ffmpeg "silenceremove" filter

  16 juin 2024, par Cara Duf

  I want to remove completely silence parts from wav files with ffmpeg.

  


  Input wav can be like :


  


  I am using the following ffmpeg command to remove silence part ffmpeg -i input.wav -af silenceremove=stop_periods=-1:stop_duration=0.2:stop_threshold=-45dB output.wav because I understand from the doc that it will remove all silence parts longer than 0.2 s (silence being below -45dB).

  


  But I get that where silence part has only been reduced to around 0.1 wheras I want it to be 0 (no remaining silence).

  


  In Audacity I will use "truncate audio" filter and choose the above parameters to detect silence and in the action part I will choose to truncate to 0 : .

  


  This will yield to what I want (ie an audio with no silence part remaining) :


  


  Searching on the internet only lead me to what I already do.

  


  So how can I reproduce the output I get from Audacity "Truncate Silence" filter with ffmpeg and remove all silence parts from audio ?

  


  Edit : The output from silencedetect filter is correct : ffmpeg -i input.wav -af silencedetect=0.2:n=-45dB -f null - detects exactly what audacity detects.

  


  Thanks in advance for your help

  


• drawtext video transition is not smooth

  7 juin 2020, par Sterpu Mihai

  Edit : it seems that youtube displays the 00:05 transition smoothly ; however, my local VLC doesn't so I think this must be a VLC issue of some kind.

  



  Take a look at this video : https://youtu.be/47JJnrH_LyM

  



  It's created from a bigger video and it's composed of 3 parts :

  



  part 1: 00:00 - 00:05 original.mp4
part 2: 00:05 - 00:10 original_with_caption.mp4
part 3: 00:10 - 00:15 original.mp4


  



  The caption snippet was created using the following command :

  



  ffmpeg -ss 00:05 -t 5 -i original.MP4 -vf drawtext="fontfile=C\\:/Windows/Fonts/arial.ttf:fontsize=100:fontcolor=white:x=(w-text_w)/2:y=(h-th-100):text='some random text here'" original_with_caption.MP4


  



  The cuts from the original video were made with the following commands :

  



  ffmpeg -y -i D:\temp\0706\caption\original.MP4 -ss 0 -t 5 -c copy D:\temp\0706\caption\ws\original_split_0_5.MP4
ffmpeg -y -i D:\temp\0706\caption\original.MP4 -ss 10 -t 5 -c copy D:\temp\0706\caption\ws\original_split_10_15.MP4


  



  Finally, all 3 have been merged together by creating a concat.txt file containing the following :

  



  file D:\\temp\\0706\\caption\\ws\\original_split_0_5.MP4
file D:\\temp\\0706\\caption\\original_with_caption.MP4
file D:\\temp\\0706\\caption\\ws\\original_split_10_15.MP4


  



  and then executing the command :

  



  ffmpeg -f concat -safe 0 -i D:\temp\0706\caption\ws\concat.txt -c copy D:\temp\0706\caption\ws\output.MP4


  



  The problem I'm facing is that the transition from 00:05 is not smooth whereas the one from 00:10 is.
What do I need to adapt so the transition is smooth ?

  


• FFmpeg not working in android 13, give : error=13, Permission denied [closed]

  1er février 2023, par Yasir Khan

  I have created an application for a video editor it's working on android 10 but not working on android 13. I'm using this library
implementation 'com.arthenica:mobile-ffmpeg-full:4.4'

  


  Cannot run program "/data/user/0/com.bettingsite.videoeditorprac/files/ffmpeg" : error=13, Permission denied

  


  E/FFmpeg : Exception while trying to run : [Ljava.lang.String ;@9d4c88e

  


  I have added permission for android 13 also but still not working.