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• GPU produces laggy videos with ffmpeg [closed]

  10 août 2023, par Salah M. Wahsh

  I wrote a Powershell script to batch edited many videos. but the gpu renders the videos very laggy.

  


  so I'm trying to batch trim and downsize multiple videos using ffmpeg, it works perfectly when it utilizes the CPU. The problem is the CPU is slow when rendering the videos. So, after I utilized the GPU, the rendering time went down significantly which is great, but all the videos are very laggy for some reason. Anyone faced this issue before ?
My GPU is GTX 1050 3gb, I know it's considered a lower end GPU, but it's weird that it renders all the videos very fast so I recon the GPU don't struggle that much.

  


  this is the powershell script I'm using

  


  `New-Item -Path 'EDITED' -ItemType Directory

foreach ($file in Get-ChildItem -Filter *.mp4) {
    ffmpeg -hwaccel cuvid -c:v h264_cuvid -ss 00:00:00 -i $file.FullName -t 00:00:11 -c:v h264_nvenc -c:a copy -vcodec h264_nvenc -qp 23 ("EDITED/" + $file.Name)
}`


  


• 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

  


  


• 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 ?