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• Why UA sniffing is generally bad, real-world example #1048577 : "That time a missing /s on navigator.userAgent (based on single-digit UA version assumptions) broke SM2 on iOS 8+ devices."

  1er septembre 2014, par scottschiller

  Why UA sniffing is generally bad, real-world example #1048577 : "That time a missing /s on navigator.userAgent (based on single-digit UA version assumptions) broke SM2 on iOS 8+ devices."
  The upside : The fix is adding \s to a UA regex check targeting legacy iOS devices with broken HTML5 Audio support, so that the "OS 10 " portion of the UA string does not match the pattern "OS 1 ".
  This is a pre-emptive fix for the pending iOS 8 release, which reportedly includes the string "iPhone OS 10_10 like Mac OS X". Due to SM2 checking for /os ([12|3_0|3_1])/i which had broken HTML5 Audio() support, and not considering the far future possibility of "iOS 10" being included in the userAgent string at the time, HTML5 audio is incorrectly disabled on iOS 8 beta 3 and is likely to apply to the final iOS 8 release.
  This is a good example and reminder of why UA checks are generally bad, and dangerous ; similar issues hit other libraries doing UA and plugin checks both client and server-side when IE hit 10, and Flash hit version 10, so this iOS pattern change may affect some other libraries targeting iOS as well.
  

• Convert pictures to live video using ffmpeg and python

  31 mars 2015, par zerzer

  I’m trying to record a live video (using H.264 codec) from a series of pictures that i receive by socket using python.

  I tried to use the MoviePy package (documentation here : github.com/Zulko/moviepy) on python to do that but i didn’t figured it out.

  If anyone have a guide on how to get started with python and saving pictures I receive as frames in real time using ffmpeg, I would really appreciate it .

  what I have is something like this , but it gives only the last captured image in the video it doesn’t save continuously the stream of images :

  from moviepy.editor import *
  
  import numpy as np
  
  
  
  while True:
  
     data = sock.recv()
  
     image = np.fromstring(data)
  
     folder = [image] 
  
     cv = ImageSequenceClip(folder, fps = 1)
  
     cv.write_videofile("video.mp4")

• How to use FFMPEG to add different pictures into one video

  24 juillet 2012, par user1546926

  What I want to do is to display different pictures on specific time periods of the video.

  I have got a solution which is using FFMPEG to split the video into several components and then adding pictures as watermark into those components, and finally join them together.

  However, I don't think it is very efficient when tackling with large videos.

  Any idea ? doesn't need to be done in a single command, could even be a script. thanks in advance.

  this is what I did :

  Codes for adding watermark

  ffmpeg -ss 00:00:00 -t 00:01:30 -i test.mpg -vf "movie=logo1.png [watermark];[in]
  
  [watermark] overlay= main_w-overlay_w-10:main_h-overlay_h-10 [out]" -vcodec flv -sameq out1.avi
  
  
  
  ffmpeg -ss 00:01:30 -t 00:03:00 -i test.mpg -vf "movie=logo2.png [watermark];[in]
  
  [watermark] overlay= main_w-overlay_w-10:main_h-overlay_h-10 [out]" -vcodec flv -sameq out2.avi

  Codes for joining avi(running on Windows)

  copy out1.avi /b + out2.avi /b output.avi /b