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• How to extract duration time of online videos listed in a text file

  22 août 2022, par Ginofalaci

  I need to check the duration of thousand of videos online. I m trying to get this from a text file containing the urls of the videos.

  


  I have those two commands that are working great with one url, but i don't find out how to get it work with a list within a file text.

  


  fmpeg -i My.url 2>&1 | grep "Duration"| cut -d ' ' -f 4 | sed s/,//


  


  or this :

  


  ffmpeg -i my.url 2>&1 | grep Duration | sed 's/Duration: \(.*\), start/\1/g'


  


  im trying :

  


  fmpeg -i listurls.txt 2>&1 | grep "Duration"| cut -d ' ' -f 4 | sed s/,//


  


  or this :

  


  ffmpeg -i listurls.txt 2>&1 | grep Duration | sed 's/Duration: \(.*\), start/\1/g'


  


  my file text is like this :

  


  myurl1.m3u8
  
myurl2.m3u8
  
myurl3.m3u8
  
myurl4.m3u8
  
myurl5.m3u8

  


  I've also tried :

  


  file 'myurl1.m3u8'
  
file 'myurl2.m3u8'
  
file 'myurl3.m3u8'
  
file 'myurl4.m3u8'
  
file 'myurl5.m3u8'

  


  but it doesn't work.

  


  Also some videos might not be online anymore, but still referenced, so it would give no result, but I would like if possible to have the result "0" than nothing, it will be much easier to use the results afterwards.

  


  (awk, sed, mediainfo, exiftool, any will be good, ) Thanks in advance.

  


• Apply an FFMPEG overlay TWICE after some time

  22 juillet 2022, par Norb Batt

  I already made an image sliding into itself using the overlay filter, but after that first overlay, I want it to happen again during the same video.

  


  My script looks like

  


  ffmpeg -loop 1 -i IMAGE.jpg -filter_complex "[0][0]overlay=x='max(W-(w/2)*t,0)':y=0" -t 10 OUT.mp4


  


  ---

  


  I thought repeating the filter with a time delay would work, as in :

  


  ffmpeg -loop 1 -i IMAGE.jpg -filter_complex "[0][0]overlay=x='max(W-(w/2)*t,0)';[0][0]overlay=x='if(gte(t,2), max(W-(w/2)*(t-2),0), NAN)'" -t 10 OUT.mp4


  


  But the second filter does not happen.
What am I missing ?

  


• How to extract video clip from larger video based on specific time and duration

  26 juillet 2022, par user19019404

  I have video clips that get created. Each video is recorded for 5 minutes and starts at a time e.g. 10:01:20 to 10:06:19 then the next video from 10:06:20 etc. These videos are recorded at a specific frame rate, be it 5 frames or 30 frames (its dependent on the platform making the recording). The net result is NOT a 5 minute video clip but might be a 2 minute video clip (where everyone moves very quickly in the view as a result of the frame rates). I cannot restrict a 1 to 1 recording as these are generated by external systems.

  


  I need to extract specific portions out of the video. For example I need to extract from 10:03:10 to 10:03:35 (25 seconds). This would equate to 10 seconds into the video up to 14 seconds into the video, in those 4 seconds of video, 25 real world seconds are displayed.

  


  My question is do you have any guidance as to how I can calculate that each second of recording actually means 10 or 12 seconds in real life, therefore go to this frame and record to this frame for example.

  


  I have been looking at cv2.CAP_PROP_FPS to get the video frame rates, CAP_PROP_POS_MSEC and CAP_PROP_FRAME_COUNT and believe the answer might lie there, but not sure.

  


  The thinking being if I work out the frame rate of the video, the total frames then I can divide the one by the other to get to how many frames make up real world seconds (this is where I fail). This way I can run from frame to frame as a result.

  


  Thank you