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• Seeking with the activeX VLC plugin has a bad response rate

  24 juin 2017, par Vitalis Hommel

  I am using axVLCPlugin.input.time = pos; where pos is the new time to browse through a video clip in small resolution (240p) in a VLC activeX part of my program using a slider, which updates pos.

  On an older laptop this worked flawlessly, with no delay. On my new laptop, this works only with significant delay, meaning that once I enter a new position, it takes about 1 second to show this position of the video on screen in the VLC activeX plugin. Previously it was instant.

  Is this

  1. a VLC issue(2.2.6 umbrella) ?
  2. a Visual Studio issue(VS 2017) ?
  3. a video encoding issue(ffmpeg version N-86482-gbc40674 - ffmpeg -i inputfile.extension output.mp4) ?
  4. a video codec issue ?

  EDIT : fortunately I found that the activex-plugin has an output. This is what it gives me : https://pastebin.com/GEKb22Gg - still unclear what that means

  How to track down the cause and solve it ?

• How to find higest bitrate in mp4 file and extract jpg ?

  10 octobre 2018, par Igor Petev

  I im using ffmpeg and have mp4 file that is in size around 50MB and duration 2m7sec.I need to write batch script for windows that will read whole mp4 file find position in seconds where higest bitrate is there and extract jpg image from that position.

  For example, i have mp4 trailer file that i would like to extract cover, using above script where i define time to extract jpg i get on some mp4 trailers black screen...so using above idea to find higet bitrate for shure will not be black screen, will be picture of some scene.

  Here is windows batch code that extract jpg dfrom mp4 using user defined time :

  @ECHO OFF
  
  SET oldName=
  
  SET newName=
  
  
  
  FOR %%A IN (*.mp4) DO (
  
  SET oldName=%%A
  
  SET newName=%%A
  
  CALL :MAKEJPG
  
  )
  
  
  
  :MAKEJPG
  
  SET newName=%newName:mp4=jpg%
  
  IF NOT EXIST %newName% (
  
  START /B /WAIT D:\www\ffmpeg.exe -i "%oldName%" -ss 00:00:17.30 -vcodec mjpeg -vframes 1 -f image2 "%newName%"
  
  EXIT
  
  )

• FFmpeg delogo or blur a scrolling text

  17 décembre 2017, par Enrico Baldi

  i cheked around but i was uanble to find a solution on this issue.

  Lets consider on my video i have a scvrolling text that appear at a fixed time moving from RIGHT TO LEFT.

  Now the point is i wanna DELOGO this TEXT or better i wanna blur this text.

  THis is what i know :

  ffmpeg -i %FILE% -vf delogo=x=%XX%:y=%YY%:w=%WW%:h=%HH% -vcodec libx264 -movflags +faststart -threads 0 -r 25 -g 50 -crf 28 -me_method hex -trellis 0 -bf 8 -acodec aac -ar 44100 -ab 128k -f mp4 nologo-file.mp4

  What i need to do so is to apply this delogo filter moving it from one potition to an other position in the way it can cover the scrolling text.

  I found also this post here thatis about overlaying a video to an other video and scroll it from one position to an other.

  FFmpeg move overlay from one pixel coordinate to another

  What i need is the help to mix this things together, because i’m unable to udnerstand all completly and i’m unable to type down the correct command.

  Thanks