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• FFMPEG is not recording the whole window

  25 mai 2021, par John

  I'm using FFMPEG to record a window as illustrated in the figure below. In all cases, the right hand side of the recorded window is cropped. The command I'm giving is

  



  ffmpeg -f gdigrab -i title="example.txt - Notepad++" output.mkv


  



  Any suggestion on how to fix this problem is much appreciated.

  



  

  



  Here are some additional info :

  



  

  • Running Windows 10

  


  • Using ffmpeg-20181215-011c911-win64-static, but I have the same issue using other versions of FFMPEG

  


  • Desktop resolution is 3200x1800 (dpi scaling issue ?)

  


  



  This is what the recorded area looks like in the example above

  



  

  



  Update 1 :

  



  Recording the whole desktop works fine, however, when recording a region using x and y offsets, the region captured is correct, but the region indicated is wrong. I illustrate this in the image below that shows a screen capture of the desktop during recording. The background image is a grid and the taskbar has been hidden.

  



  

  



  The size of the area to capture is specified to 1280x720, but the region indicated is 1600x900. Also, the x offset is specified to 400px, but the region indicted starts at 500px.

  



  The area recorded is correct ! The image below shows a screenshot of the recording during playback in vlc, note that the "misplaced" region indicator can be seen

  



  

  



  Update 2 :

  



  I noticed that the cursor, the mouse, is not correctly placed when capturing from the desktop, see recording below. Everything looks fine during recording, but at playback the cursor is misplaced.

  



  

  



  The command issued for the recording above was :

  



  ffmpeg -f gdigrab -framerate 30 -offset_x 1820 -offset_y 100 -video_size 1280x720 -i desktop output5.mkv


  



  Windows 10 / ffmpeg-20181215-011c911-win64-static

  


• How to batch downsample alac files using ffmepg ? [closed]

  1er octobre 2022, par A meme

  So I've got a libarary of songs I wan to throw on an Ipod photo I modified flash modded, sadly due to the fact I want to stick to iTunes for syncing I cant import some of my alac's due to their sample rate being at 88200Hz, I've read that the iPod can only handle up to 48000hz but I can't figure how to make a simple single line lookup script to just downsample them all in one go.

  


  I've tried :

  


  find . -type f -name '*.m4a' -print -exec sh -c 'i="{}"; ffmpeg -i "$i" -compression_level 12 [-ar 48000 -sample_fmt 16] "$i"\; 


  


  but it just blinks the cursor and trying

  


  ffmpeg -i <my song="song"> -compression_level 12 [-ar 48000 -sample_fmt 16] <my output="output">&#xA;</my></my>

  


  gave me an error of failed to convert
I also tried sox but it doesn't have a handler for .m4a which is what alac is.

  


• Video Overlapping in iOS

  16 février 2015, par Chandan005

  I’m working on an app where I have to overlap an alpha channel video over a video recorded from the device camera. Is it possible using GPUImage framework ?
  If YES how can I implement it using GPUImage ?
  And if NO what alternative do I have ?