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• ffmpeg Join MP4 videos, error (audio) of vine.co

  26 novembre 2014, par user3537531

  I’ve tried everything bucar after searching and I have not managed to unite vine.co videos to upload to youtube. Sometimes youtube error notifies Encryption, sometimes the video is cut audio to half, and in other cases the audio does not match the video.

  things I’ve tried

  ---

  file '/path/to/1.mp4'
  
  file '/path/to/2.mp4'
  
  ffmpeg -f concat -i list.txt -c copy result.mp4

  ---

  ffmpeg -i concat:"1.mp4|2.mp4" -codec copy result.mp4

  ---

  ffmpeg -i "concat:1.mp4|2.mp4" -c copy result.mp4

  The video is created, but always happen any errors or youtube audio conversion error tells me.

  We are talking of joining between 300 and 1,000 videos of between 3 and 6 seconds.

  From what I’ve read all would have to have the same frame rate and the same resolution.

  I have also proven to mp4box and post on youtube gives me trouble conversion

  mp4box-cat 1.mp4 -cat 2.mp4 -new result.mp4

  And not more I can do, I hope you can help me to attach a lot of videos on console. A greeting and thanks.

• How to concatenate multiple videos in ffmpeg JS using and Mute them as well in command line

  22 janvier 2021, par Sultan Haider

  Using Command Line for FFMPEG in javascript to concatenate videos and muting them also. There was problem for me to find commands for JS in the following format

  


  ('-i', 'test.mp4', '-vf','reverse', 'out.mp4')

  


• Android - merge videos taken with front and back cameras

  3 mai 2023, par Raz Leshem

  I am having an orientation problem when merging videos taken with front and back cameras in portrait, recorded using Android CameraX.

  


  This issue is explained here, but I am yet to find a working solution. I have tried multiple solutions, such as using mp4parser as suggested in the issue explanation, but the result is a that every alternate camera video is upside down.
I also tried using FFmpeg for android - mobile-ffmpeg.
Using ffmpeg Concat demuxer resulted in the same result as mp4parser did.

  


  Concat demuxer command I used : ffmpeg -f concat -safe 0 -i mylist.txt -c copy output.mp4

  


  I also tried changing the rotation metadata of the videos to match before concatenating, similar to how it's done here, but that did not seem to have any effect on the end result.

  


  Lastly, I used ffmpeg Concat filter. That solution took longer obviously because of the re-encoding of the video but it did fix the problem of the orientation of the videos, but the output video quality was poor.

  


  Concat filter command :

  


  ffmpeg -i front1.mp4 -i rear1.mp4 -i front2.mp4 \
-filter_complex "[0:v] [0:a] [1:v] [1:a] [2:v] [2:a] \
concat=n=3:v=1:a=1 [v] [a]" \
-map "[v]" -map "[a]" output.mp4


  


  Has anyone found a solution on how to fix the orientation problem in android ? or maybe how can I keep the videos quality as much as possible when using the FFmpeg Concat filter to merge the videos ?