Recherche avancée

Sur d’autres sites (5636)

• fmpeg : concat reduces FPS

  25 octobre 2019, par Diamonde123

  I used ffmpeg to make one video out of 49 (those videos are 25 fps 6-15min long).

  ffmpeg -f concat -safe 0 -i path\inputs.txt -c copy video.mp4

  Somehow it made a video that is 80 hours long and with 3,68 framerate

• ffmpeg select subclips from large video bash and create outputfile names

  29 juin 2018, par martins

  I am using bash command on a Mac Terminal. For each of the 250 .mp4 files in a directory I need to create a new outputfile which extracts 4 subclips from each inputfile : 1st subclip (from second 10 to 20), 2nd subclip (10 seconds at a 33% stage of the inputfile), 3rd subclip (10 seconds at a 66% of the inputfile), and a 4th subclip (10 seconds starting 30seconds before the end of the inputfile). Each inputfile has a different length of about 10-15minutes.

  I tried with one inputfile and the following bash script works :

  #!/bin/bash
  
  for file in *.mp4; do ffmpeg -i "$file" -vf "select='between(t, 10, 20) + between(t, 197, 207) + between(t, 393, 403) + between(t, 570,580)',
  
  setpts=N/FRAME_RATE/TB" -qscale 0 -af "aselect='between(t, 10, 20) + 
  
  between(t, 197, 207) + between(t, 393, 403) + between(t, 570, 580)', 
  
  asetpts=N/SR/TB" outputfile.mp4; done

  However, I don’t know how to loop it over the 250 mp4 files. Specifically, I have 2 issues :

  1. The above code shows specific seconds I manually checked from the inputfile I used to test the code. I need to automatize the code according to the timings above.
  2. Name the outputfile the same as the inputfile but adding "_1" suffix

  In sum, I have a directory with inputfiles between 10-15minutes long :

  inputfile1.mp4
  
  inputfile2.mp4
  
  inputfile3.mp4
  
  .......
  
  inputfile250.mp4

  And I want the same directory with inputfiles and outputfiles together :

  inputfile1.mp4
  
  inputfile1_1.mp4 #this is 40 seconds long
  
  inputfile2.mp4
  
  inputfile2_1.mp4 #this is 40 seconds long
  
  inputfile3.mp4
  
  inputfile3_1.mp4 #this is 40 seconds long
  
  .......
  
  inputfile250.mp4
  
  inputfile250_1.mp4 #this is 40 seconds long

  Thank you very much in advance.

• Inserting ad in a video

  29 novembre 2018, par zomie

  I am developing an application in which i want to add an ad in between video. eg:Main video is 10min long.I want to add an ad in between that say at 2nd minute.Ad video is 3min long.Video should be paused and ad video should be played along with its audio , also the main video has to be resumed from where it was paused. Can this be solved with ffmpeg ?If yes please say how ? THANKS in advance