Recherche avancée

Sur d’autres sites (10101)

• Adding audio at specific time of the video

  21 septembre 2018, par Sergio Bruccoleri

  I want to add an audio file at a specific time of the video, without completely replacing the original video audio stream (just at the specific time, for the whole duration of the replacement audio).

  I have this command below :

  ffmpeg -y -i video.mp4 -itsoffset 00:00:07 -i audio.mp3 -map 0:0 -map 1:0 -c:v copy -async 1 out.mp4

  but this command replaces the entire audio stream of the video with the content of the second input

  The expected result is :

  • The video plays as normal with the original audio

  • Once timestamp 00:00:07 is reached, the new ’replaced’ audio streams
    play.

  • Once the new audio streams stops the original audio continues
    playing.

  Anyone that can help me solving this issue ? I’ve been trying with atrim without any result, but probably I am doing something wrong.

• How to use ffmpeg filter to remove a frame every 12 seconds [closed]

  28 juin 2024, par YOURSELF BEST

  I want to delete 1 frame every 12 frames of the video. The original video has a frame rate of 30, so after deleting it, it becomes 28. How should I write this operation using ffmpeg ?

  


  I used the following command, but there is a problem, the new video generated will be shorter than the original video

  


  ffmpeg -y -r 28 -vsync 0 -i demo.mp4 -vf "select='mod(n+4,12)',setpts='N/28/TB'" "demo_2.mp4"

  


  Please help me how should I do it, thanks

  


• drawtext video transition is not smooth

  7 juin 2020, par Sterpu Mihai

  Edit : it seems that youtube displays the 00:05 transition smoothly ; however, my local VLC doesn't so I think this must be a VLC issue of some kind.

  



  Take a look at this video : https://youtu.be/47JJnrH_LyM

  



  It's created from a bigger video and it's composed of 3 parts :

  



  part 1: 00:00 - 00:05 original.mp4
part 2: 00:05 - 00:10 original_with_caption.mp4
part 3: 00:10 - 00:15 original.mp4


  



  The caption snippet was created using the following command :

  



  ffmpeg -ss 00:05 -t 5 -i original.MP4 -vf drawtext="fontfile=C\\:/Windows/Fonts/arial.ttf:fontsize=100:fontcolor=white:x=(w-text_w)/2:y=(h-th-100):text='some random text here'" original_with_caption.MP4


  



  The cuts from the original video were made with the following commands :

  



  ffmpeg -y -i D:\temp\0706\caption\original.MP4 -ss 0 -t 5 -c copy D:\temp\0706\caption\ws\original_split_0_5.MP4
ffmpeg -y -i D:\temp\0706\caption\original.MP4 -ss 10 -t 5 -c copy D:\temp\0706\caption\ws\original_split_10_15.MP4


  



  Finally, all 3 have been merged together by creating a concat.txt file containing the following :

  



  file D:\\temp\\0706\\caption\\ws\\original_split_0_5.MP4
file D:\\temp\\0706\\caption\\original_with_caption.MP4
file D:\\temp\\0706\\caption\\ws\\original_split_10_15.MP4


  



  and then executing the command :

  



  ffmpeg -f concat -safe 0 -i D:\temp\0706\caption\ws\concat.txt -c copy D:\temp\0706\caption\ws\output.MP4


  



  The problem I'm facing is that the transition from 00:05 is not smooth whereas the one from 00:10 is.
What do I need to adapt so the transition is smooth ?