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• insert audio into another audio file (eg a censor bleep)

  3 avril 2019, par Redzarf

  I need to insert a short beep into another audio file (similar to a censorship bleep) using linux and/or php.

  I’m thinking there should be some way to do it with ffmpeg (with some combination of -t, concat, map, async, adelay, itsoffset ?) or avconv or mkvmerge - but haven’t found anyone doing this. Maybe I need to do it in 2 stages somehow ?

  For example if I have a 60 second mp3 and want to beep out 2 seconds at 2 places the desired result would be :

  0:00-0:15  from original
  
  0:15-0:17  beep (overwrites the 2 secs of original)
  
  0:17-0:40  from original
  
  0:40-0:42  beep
  
  0:42-0:60  from original

  I have a 2 second beep.mp3, but can use something else instead like -i "sine=frequency=1000:duration=2"

• Using command line find to encode files and save to same directory

  15 janvier 2017, par Ali Samii

  I am trying to execute a find bash command to process hundreds of video files that are all named video-original.mp4 but are in subdirectories of a parent directory.

  Here’s an example of the directory structure :

  videos
  
  ├── 01a
  
  │   └── video-original.mp4
  
  ├── 01b
  
  │   └── video-original.mp4
  
  ├── 02a
  
  │   └── video-original.mp4
  
  ├── 02b
  
  │   └── video-original.mp4
  
  ├── 03a
  
  │   └── video-original.mp4
  
  └── 03b
  
      └── video-original.mp4

  I am using the following command :

  find ./ -name 'video-original.mp4' -exec bash -c 'ffmpeg -i "$0" -f mp4 -vcodec libx264 -preset veryslow -profile:v high -acodec aac -movflags faststart video.mp4 -hide_banner' {} \;

  The problem I am having is that it is saving the file video.mp4 in the parent videos directory, instead of in the subdirectory next to the original video-original.mp4

  Afterwards, I want to delete the file video-original.mp4. Currently, my process entails waiting for all the videos to be reencoded, and then once complete, issuing a separate command to delete the file video-original.mp4 :

  find ./ -name 'video-original.mp4' -exec bash -c 'rm -rf "$0"' {} \;

  And my final step would be to extract a screenshot of the new video.mp4 at 10 seconds and save it as thumbnail.jpg. Again, I am currently doing that as a separate step that I execute after the previous two steps are completed.

  find ./ -name 'video.mp4' -exec bash -c 'ffmpeg -i "$0" -ss 00:00:10 -vframes 1 thumbnail.jpg' {} \;

  What I would like to do is combine these three steps into a single command so the end result will be :

  videos
  
  ├── 01a
  
  │   ├── thumbnail.jpg
  
  │   └── video.mp4
  
  ├── 01b
  
  │   ├── thumbnail.jpg
  
  │   └── video.mp4
  
  ├── 02a
  
  │   ├── thumbnail.jpg
  
  │   └── video.mp4
  
  ├── 02b
  
  │   ├── thumbnail.jpg
  
  │   └── video.mp4
  
  ├── 03a
  
  │   ├── thumbnail.jpg
  
  │   └── video.mp4
  
  └── 03b
  
      ├── thumbnail.jpg
  
      └── video.mp4

  Finally, it would be great to save that as a bash script and include it in my path in /usr/local/bin or ~/bin as an executable so I could just issue the command reencode and it would run. Would be even better if the input file could have any video file, for example, random_name.mp4 or random_name.mov or random_name.webm, basically any video file (but skipping video.mp4 at the encoding step).

• How to downlaod 5 min video from 1 hour you tube video

  27 novembre 2013, par psanjib

  I have tried and also success to download you tube video for that i use ffmpeg. But there is a problem if the video duration is long (1 hour) the that will take more time to download.

  Is there any way to download 5 min video from 1 hour you tube video

  Thanks in advance