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  • Submit bugs and patches

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    If you think you have solved the bug, fill in a ticket and attach to it a corrective patch.
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Sur d’autres sites (4406)

  • 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. 


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

      


      3. 


    


    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

      • 


    


  • 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 ?

    


  • 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.

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