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• Stitching videos (with very precise camera angles) into 360 video [on hold]

  4 mai 2017, par Basset hound

  I can record videos with very precise camera angles.
  I also used Autopano Video to stitch the videos, the result is awesome.

  I was wondering, if I can record videos with very precise camera angels.
  Do I really need 3rd party commercial software to stitch the videos ?

  Can I get it down by C# or ffmpeg or OpenCV or open source ?
  Any hint or advice would be appreciated.

• Can I detect duplicated videos using ffmpeg ?

  28 décembre 2020, par Tobias

  Is it possible to detect duplicate videos (.mp4 files) using ffmpeg (or similar tools) ?

  


  There are around 3000 videos in my file system, some of them twice (since these are automatically downloaded by a bot from various sources). So it can happen that these differ a little from the video / audio quality.

  


  My first idea now would be to render the videos to a quality that is consistent and store the MD5 hash of the file in the database. There I would check for duplicate hashes.

  


  Is this the right approach or does anyone have an idea how I could best implement this ?

  


• What is the most efficient way of stacking two videos using ffmpeg ?

  4 octobre 2024, par technical_difficulty

  I want to stack two videos of a talk together vertically using ffmpeg. One shows the presentation (slides) and one shows the speaker. Since I want to do this for several talks, I'd like to do this in a more general way and as efficiently as possible. Most of the time the videos have different resolutions and aspect ratios.

  


  My current workflow is :

  


  


  1. Scale the video with the lower resolution up to match the resolution of the other video :
ffmpeg -i video1.mp4 -s 1920x1080 -c:a copy video1_upscaled.mp4

     


  


  2. Stack the two videos :
ffmpeg -i video1_scaled.mp4 -i video2.mp4 -filter_complex vstack=inputs=2 combined.mp4

     


  


  


  The videos are between one and two hours long and the commands do take a while to complete. Is there any way of saving some time ?

  


  Would it be faster to put black bars/borders around the smaller video instead of scaling it to the size of the other one ? Can the stacking be done in a more efficient way ? Would it help a lot if those two steps were combined into one ?

  


  Some information that might be relevant :

  


  

  • it's always exactly two videos to stack vertically, one above the other

  


  • the quality of the video is not incredibly important, both having the resolution of the video with the lower resolution would be perfectly fine

  


  • disk space is not an issue

  


  • the resolution and aspect ratio of the videos are known (use any for your example)

  


  • both videos have the same audio

  


  • both videos have the exact same length