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• stitching two videos into one using FFMPEG

  30 juillet 2015, par nikhil khare

  I am using FFmpeg to concatenate two videos. I use demuxer option like this.
  Created a file using following text.

  file '/var/www/html/test/input/video1.mp4'
  
  file '/var/www/html/test/input/video2.mp4'

  The codec, bit-rate and aspect ratio are same for both the videos. Now I use this command to generate the output

  ffmpeg -f concat -i mylist.txt -c copy merged.mp4

  It creates the output file with merging the videos but, when i position the seek button to any time it stops playing. The total video duration is also a lot more than the actual video duration.

  It also does not show the second video after the first video is finished. It keeps the last frame through out the video.

  I have found somewhere to mention the duration in the text file, but I am not able to implement it. Please help.

• How to concat videos that have different colour spaces ?

  17 avril 2023, par Ham789

  I writing a Python program that uses subprocess to automate ffmpeg. The program concatenates many videos together with the concat filter. The problem I have is that the colour of some of the videos is very washed out in the final output. I believe this is because the videos have different colour spaces. Some are B.709 and some are B.2020. The B.2020 videos are washed out.

  


  I have tried converting the B.2020 videos to B.709 before concatenating by using the following command on each video but the outputs are still washed out :

  


  ffmpeg -i input.mov -vf colorspace=all=bt709:iall=bt2020:fast=1 output.mov


  


  It wasn't clear to me which way round the arguments should go so I also tried switching the bt2020 and bt709 terms but they still look washed out but with more saturation.

  


  Is this the right approach ? Am I missing some other arguments in order to convert the B.2020 videos to B.709 while preserving their colour ?

  


  I have attached a side by side of the original and converted video.

  


  The metadata of the videos I am trying to concat are :

  


  Video 1

  


  

  • color_range=tv

  


  • color_space=bt709

  


  • color_transfer=bt709

  


  • color_primaries=bt709

  


  


  Video 2

  


  

  • color_range=tv

  


  • color_space=bt2020nc

  


  • color_transfer=arib-std-b67

  


  • color_primaries=bt2020

  


  


• Combine two videos using Go and FFmpeg

  15 mai 2017, par JosephCenk

  I have two videos, Video A && Video B. I want to combine both videos to a new video C using golang. I tried FFmpeg, but I am unable to cross compile it for ARM devices and getting error message.

  /usr/local/ffmpeg/lib/libavdevice.so : file not recognized : File format not recognized collect2 : error : ld returned 1 exit status

  Please advise.
  Opening two media player at once is not an option. With amd64 I compile without having any issue.