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• random_seed : Rewrite the generic clock() based seed code

  11 juin 2012, par Michael Niedermayer

  random_seed : Rewrite the generic clock() based seed code
  The new code is faster and reuses the previous state in case of
  
  multiple calls.
  The previous code could easily end up in near-infinite loops,
  
  if the difference between two clock() calls never was larger than
  
  1.
  This makes fate-parseutils finish in finite time when run in wine,
  
  if CryptGenRandom isn’t available (which e.g. isn’t available if
  
  targeting Windows RT/metro).
  Patch originally by Michael Niedermayer but with some modifications
  
  by Martin Storsjö.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] libavutil/random_seed.c

• How to combine/concatenate videos stored in AWS S3 bucket based on title of the file name

  9 juin 2020, par orangecube

  I am using a service that allows me to record videos that get automatically pushed to a folder (submissions) in an S3 bucket. There are multiple videos however they need to be grouped together and concatenated so the output is one video per group.

  



  So, basically, any tips on how I can take videos based on the title and stitch them together ?

  



  Example :

  



  Submissions folder will have :

  



  a-100-2.mp4
a-200-6.mp4
b-123-5.mp4


  



  Expected output in processed folder :

  



  a.mp4     - (both 'a' videos get stitched together)
b.mp4     - (only 'b' gets sent over since there is only one video.)


  



  Thanks in advance !

  



  Edit : Some additional and detailed information below if it helps.

  



  The files will be labeled with :
name-location-video_token-stream_token.mp4

  



  Need help creating a script or process that will concatenate the videos using the procedure outlined below :

  



  Processing rules (back end) :

  



  


  1. Check if videos have same video_token in ‘submissions folder’. If so, keep the newest one and delete old ones.

  


  2. Take all videos in ‘submissions folder’ with same name and location in title and concatenate the videos. Save output video to a new folder in the bucket labeled as the location for the folder name. 
Output file name : 
name-location-year.mp4.

  


  



  EXAMPLE :

  



  Submissions folder :
joey-toronto-001-354.mp4

  



  joey-toronto-001-241.mp4 - this will be deleted

  



  joey-toronto-103-452.mp4

  



  alex-montreal-352-232.mp4

  



  alex-montreal-452-223.mp4

  



  Resulting output :

  



  Toronto folder :

  



  Joey-toronto-2020.mp4

  



  Montreal folder :

  



  Alex-montreal-2020.mp4

  


• Scale watermark in ffmpeg based on video size [duplicate]

  24 octobre 2016, par user3600338

  This question already has an answer here :

  • ffmpeg fix watermark size or percentage
    
    1 answer
    

  I have a folder with videos, all with different resolutions. The goal is to add a watermark on them, which I’ve successfully been able to done using this batch script :

  for %%I IN ("C:\path\input\*.flv") DO ffmpeg.exe -i "%%I" -i "watermark.png" -filter_complex "overlay=W-w-5:5" -qscale 1 C:\path\output\%%~nI.avi"

  The problem is that the size of the watermark changes a lot based on the video resolution. I’ve understood that I should use one -filter_complex with both scale and overlay, but I don’t get it to work. I want something like this :

  -filter_complex "scale=main_w*0.3:-1 ; overlay=W-w-5:5"

  To clarify, I want the watermark to be 30% of the width of the video. How can I do this ? Thanks in advance