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• C# streaming drone video

  12 May 2017, by jasonmacintosh

  I am currently a student and I have a project which require using the drone and the livestream from its camera

  I managed to find a control program http://www.winardrone.com which can control my ar drone 2.0 , but the problem is that the program doesn’t support my drone’s camera live stream method(TCP)due to the fact that the program is more compatible to the ar drone 1.0(older version drone) which uses(UDP)

  so I have encountered a problem of putting the video stream into my program
  ,there are a really simple solution of using ffmpeg player with cmd command "ffplay tcp://192.168.1.1:5555", but it does mean that my program have to run in multiple windows and I won’t be able to save my frames with my program to do analyzation

  so could anyone tell me how to Stream my TCP video in my visual studio C# program and capture frames at the same time ?
  just like the program in this video
  https://www.youtube.com/watch?v=4V5B-DPWdOQ

  I wish to get the video image in a program instead of opening a new window

  And sorry for my bad grammar, thanks for your reply

• FFMPEG : Cut specific parts of a video, and merge them in a single file

  19 February 2017, by Jay D.

  I would like to cut out specific parts of a mp4 video, and merge back those parts to create a single video file. This is to make an animated preview of the video.

  More specifically :
  Cut out these parts of a video :

  • Part 1 : start time of the cut = 20% of total time ; end time of the
    cut = 20% of total time + 3seconds,
  • Part 2 : 40% of total time ; 40%nof total time + 3 seconds
  • Part 3 : 60% of total time ; 60% of total time + 3 seconds
  • Part 4 : 80% of total time ; 80% of total time + 3 seconds

  (The videos are more than 3 minutes long, so there should not be any overlap in the parts)

  Then merge those 4 parts in a new mp4 video file. How do you do that with FFMPEG ?

  Edit : so this is as far as I got for this question :

  I found answers to questions on "Superuser" and "Stackexchange" for these questions on FFMPEG:
   How to get video durations in seconds
   Cut part from video file with start/end positions
   Concatenate mp4 files

  So : Get total time of video :

  $ ffprobe -v error -show_entries format=duration \
  
    -of default=noprint_wrappers=1:nokey=1 -sexagesimal inputvideo.mp4

  With the -sexagesimal I should get the right time format to use after.

  Cut out part of video

  ffmpeg -ss [start] -i in.mp4 -t [duration] -c copy /path/videopart[number].mp4

  Right here I don’t know :
  How to do an operation on total time (20%, 40%... then 20% +3 seconds, 40% +3 seconds..)
  How to properly implement it in the code line

  Create a file videoparts.txt with the files names :

  $ cat videoparts.txt
  
  file '/path/videopart1.mp4'
  
  file '/path/videopart2.mp4'
  
  file '/path/videopart3.mp4'
  
  file '/path/videopart4.mp4'

  Then this should merge them in a single file :

  $ ffmpeg -f concat -i videoparts.txt -c copy outputvideo.mp4

• Silence (zero out) parts of an audio file [duplicate]

  5 July 2016, by Yoni Levy

  This question already has an answer here:

  • Mute specified sections of an audio file using ffmpeg
    
    1 answer
    

  I want to silence parts of an audio file (position varies) using some command line tool (ffmpeg, sox, ...) but can’t find out how.

  I found sox ... pad to be the closest to what I want but it’s still not it, I need to override the audio not add to it (pad).