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• Evolution #3426 : enrichir la détection des robots

  19 novembre 2018, par BoOz -

  J’ai un doute sur le fait que SpreadTrum soit un bot. Dans mes logs il a l’air clean et je vois ici : https://user-agents.net/string/opera-9-80-spreadtrum-opera-mini-4-4-31492-98-16-u-fr-presto-2-12-423-version-12-16 @b_b

• [FFmpeg on Windows] : help me converting a set of .png files to a video file

  31 octobre 2016, par Stefano Fedele

  Hi everybody I am on windows 10, I installed FFMpeg and I would like to use it to convert 100 .png image files into a video file.

  I am using it via the prompt, which is the Windows console, and I am struggling with the syntax (which probability comes from Linux). I set the folder in which ffmpeg.exe is contained as a windows system path as suggested on many websites and I moved the prompt to the folders in which the image files are contained which is reported here :

  cd C:\video\pnts + ag 40 nm- during-tmpyp 10-12- laser power 7mw- kinetic100- exposure time 1s- gain

  I would like to convert the image files contained in this folder into a video file, the names of those image files are reported here :

  pnts + ag 40 nm- during-tmpyp 10-12- laser power 7mw- kinetic100- exposure time 1s- gain 20 001.png

  pnts + ag 40 nm- during-tmpyp 10-12- laser power 7mw- kinetic100- exposure time 1s- gain 20 002.png

  ...

  ...

  pnts + ag 40 nm- during-tmpyp 10-12- laser power 7mw- kinetic100- exposure time 1s- gain 20 100.png

  The number of frames per second whould be 2.

  I read on internet that I should have to type something like this

  ffmpeg -i image-%03d.png video.webm

  But it looks like there are a lot of variables to consider and all the times I try to set them and run FFmpeg I get an error from the prompt.
  Is there anyone who could suggest me the proper syntax, please ?

• Visualizing ffmpeg benchmarks

  2 avril 2020, par Saurabh P Bhandari

  I have generated benchmarks for comparing two approaches taken for scaling down video files (mp4) using ffmpeg tool.

  



  The benchmarks are logged in this format :

  



  x.mp4 Output_Resolution : 360p

Method : A 

real    0m26.817s
user    1m38.058s
sys     0m0.504s

Method : B, some-parameter-for-B : b1

real    0m26.465s
user    1m42.824s
sys     0m1.111s

Method : B, some-parameter-for-B : b2

real    0m26.236s
user    1m42.194s
sys     0m0.862s

Method : B, some-parameter-for-B : b3

real    0m25.050s
user    1m36.492s
sys     0m0.680s


y.mp4 Output_Resolution : 144p

Method : A 

real    1m9.426s
user    3m38.823s
sys     0m1.353s

Method : B, some-parameter-for-B : b1

real    1m4.956s
user    4m13.764s
sys     0m2.875s

Method : B, some-parameter-for-B : b2

real    1m5.033s
user    4m13.455s
sys     0m2.183s

Method : B, some-parameter-for-B : b3

real    0m25.050s
user    1m36.492s
sys     0m0.680s




  



  I am doing this for multiple video files and multiple resolutions. Lets say I need to visualize the comparison of benchmarks(real time) of method A and method B for given a resolution using bar chart below :

  



  

  



  How do I efficiently get the necessary values from the the log and plot them using matplotlib in python ?

  



  (I am more interested in the approach you would take to solve this problem)