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• downloading and concatenating parts of videos from youtube

  17 octobre 2018, par amit

  I’m trying to create a video quiz, that will contain small parts of other videos, concatenated together (with the purpose, that people will identify from where these short snips are taken from).

  For this purpose I created a file that contain the URL of the video, the starting time of the "snip", and its length. for example :

  https://www.youtube.com/watch?v=5-j6LLkpQYY   00:00   01:00
  
  https://www.youtube.com/watch?v=b-DqO_D1g1g   14:44   01:20
  
  https://www.youtube.com/watch?v=DPAgWKseVhg   12:53   01:00

  Meaning that the first part should take the video from the first URL from its beginning and last for a minute, the second part should be taken from the second URL starting from 14:44 (minutes:seconds) and last one minute and 20 seconds and so forth.

  Then all these parts should be concatenated to a single video.

  I’m trying to write a script (I use ubuntu and fluent in several scripting languages) that does that, and I tried to use youtube-dl command line package and ffmpeg, but I couldn’t find the right options to achieve what I need.

  Any suggestions will be appreciated.

• C# streaming drone video

  12 mai 2017, par 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 février 2017, par 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