Recherche avancée

Sur d’autres sites (6250)

• ffmpeg how to make same streams for videos

  30 septembre 2022, par bogdaryan

  The documentation says that

  


  


  All files must have the same streams (same codecs, same time base,
etc.)

  


  


  I tried this, I thought it would help to make the same streams for all videos

  


  ffmpeg -i 1.mp4 -i 2.mp4 -i 3.mp4 -filter_complex "[0]setdar=16/9[a];[1]setdar=16/9[b];[2]setdar=16/9[c]; [a][b][c]concat=n=3:v=1:a=1" output.mp4


  


  Is there any way to make all video the same streams to do then by the method with txt file ?

  


  ffmpeg -f concat -safe 0 -i mylist.txt -c copy mergedVideo.mp4 


  


  It would be very convenient, first do the conversion in one stream all the videos, then take their paths and combine. Just if I immediately do concat through the method with txt, some parts of the video just freezes the screen. I read, and they said to do same streams (same codecs, same time base, etc.)

  


• FFMPEG record mp4 video stream stutters

  19 février 2021, par nas local

  I want to record a mp4 livestream white ffmpeg in realtime.
I have created a script for this purpose :

  


  #!/bin/bash

# input
vidLink="https://cant.post.the.real.url.here/playlist.m3u8"
vidLen=$(( 60 * 150 ))
filePrefix="$( date --iso-8601 )_Rec"
fileSufix=".mkv"

ffmpeg -re -y -i "$vidLink" -t $vidLen "$filePrefix$fileSufix"


  


  The problem is that there are bits missing from the recordings (10 second parts).
I assume this comes from the option -re (realtime).

  


  I don't know exactly when the live broadcast starts. If there is no live broadcast on the channel, a test image is sent out.
If i do not use the "-re" option and i start the recording too early, the entire video length is filled with the test image.

  


  Any ideas how I can record the stream automatically ?

  


• How to accurately remove silence part from the beginning of a video ?

  6 mai 2015, par Nir Altmark

  I’m trying to use FFMPEG in order to remove silence parts from a video.
  I’m not trying to remove only from the audio stream but from both streams together.
  In order to do that I’m using the silence detect filter like this.

  ffmpeg -i input.mp4 -af silencedetect=n=-25dB:d=1 -f null -

  Than i take the result, for example :

  [silencedetect @ 000000000002ec00] silence_start: -0.0150208
  
  [silencedetect @ 000000000002ec00] silence_end: 4.48898 | silence_duration: 4.504

  And I’m trying to cut the whole movie using -ss.

  ffmpeg -ss 00:00:04.504 -i input.mp4 -vcodec copy -acodec copy output.mp4

  Unfortunately, it never really cut the video at the desired point.
  If i’ll try to do the same only on the audio stream it will work.
  I’ve also tried to re-encode the video, nothing works.

  Questions :
  1. Is this the right way to achieve it using FFMPEG ?
  2. Are there other ways to do this ? I’m not bounded to FFMPEG.