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• How can I record a rectangle centered around the mouse cursor when it last moved

  28 décembre 2022, par Vesoripi

  I would like an ffmpeg incantation that will do A, or B, or C where

  


  A is…
The ffmpeg incantation will record a rectangle that is centered around the caret (the "text cursor") when text is being typed.

  


  B is…
The ffmpeg incantation will record a rectangle that is centered around the mouse cursor when the mouse cursor is actually moving or when the mouse cursor had been moving less than, say, 2 seconds ago.

  


  C is…
The ffmpeg incantation will stop recording video, yet continue to record audio, if the mouse cursor had not been moving for 2 seconds or longer and the caret (the "text cursor") had not been moving for 2 seconds or longer.

  


  On Linux Mint 21.1 Cinnamon, although both of the following incantations…

  


  ffmpeg -f x11grab -follow_mouse centered -framerate 25 -video_size cif -i :0.0 -preset slow output.mkv


  


  and

  


  ffmpeg -f x11grab -follow_mouse centered -show_region 1 -framerate 25 -video_size cif -i :0.0 -c:v libx264 -crf 0 -preset slow output.mp4


  


  successfully record the mouse cursor as I would like, obviously both incantations fail to record the caret (the "text cursor") when text is being typed.

  


  Here’s my use case…

  


  As a form of documentation, I intend to create screencasts of my coding sessions which I will narrate. I realize that this unusual form of documentation would normally result in large video files. Therefore, instead of recording the entire screen, I would like to record a small rectangle around either the area where I am typing text or—when I am using my mouse—around the area my mouse cursor is located. As a result I hope to create video files which take up less storage space, yet are still useful to me.

  


  For example, I hope that when I review my coding sessions I will be able to quickly be reminded that, for example, "Oh, yeah, that's what I was thinking when I wrote that line of code. Yes. Now I remember : I was stuck, then went to Stackoverflow, did some research, and found solution XYZ to solve my problem.”

  


  In other words, I won’t exclusively be coding during my coding sessions ; sometimes I will be doing research on, for example, Stackoverflow. When I am doing research on—for example, Stackoverflow—I want my mouse cursor recorded.

  


  For your information, follow_mouse at 3.21.1 Options.

  


• avdevice/x11grab : fix cursor drawing in multi-screen setup

  8 septembre 2014, par Antonio Ospite

  avdevice/x11grab : fix cursor drawing in multi-screen setup
  The code uses XFixes to retrieve the cursor coordinates, but XFixes
  
  gives no information of what screen the pointer is on ; this results in
  
  always drawing the cursor on the captured screen even if the mouse
  
  pointer was on another screen.
  For example, when capturing from screen 1 (i.e. -f x11grab -i ":0.1")
  
  the cursor was being drawn in the captured image even when the mouse
  
  pointer was actually on screen 0, which is wrong and visually confusing.
  Use XQueryPointer to check that the pointer is actually on the screen
  
  which is being captured.
  Signed-off-by : Antonio Ospite <ao2@ao2.it>
  
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavdevice/x11grab.c

• FFMPEG Re-muxing .MKV to MP4\MV4 while retaining Dolby Digital Plus JOC [closed]

  31 décembre 2020, par David F

  My ask is, does anyone have any knowledge of how to remux and keep Enhanced AC-3 with Joint Object Control with FFMPEG.

  


  I would be grateful if anyone could help me out here. I'm remuxing a number of video files from .MKV to .MP4\M4V so they play on the Apple platform (including the TV App). It's important NOT to convert, but to remux.

  


  I have achieved the ability to remux 4K HDR with Dolby Digital Plus in a .MKV to 4K HDR with Dolby Digtial 5.1. MP4. The issue is retaining the Dolby Digital Plus. This contains the ATMOS information for object based sound.

  


  The media players on Apple reports Dolby Digital Plus for the .MKV and Dolby Digital 5.1 for .MP4. I know Dolby Labs to allow free remuxing of Dolby Digital Plus/ Atmos with sample code and information they have uploaded onto Github for developers.

  


  I'm using FFMPEG with the following command :-

  


  ffmpeg -i original.mkv -c:v copy -c:a eac3 -tag:v hvc1 output.mp4

  


  Resulting output from MediaInfo (note .MKV contains only 1 video and 1 audio track)

  


  Audio -----Original.mkv

  


  

  • ID : 2

  


  • Format : E-AC-3 JOC

  


  • Format/Info : Enhanced AC-3 with Joint
Object Coding

  


  • Commercial name : Dolby Digital Plus with Dolby
Atmos

  


  • Codec ID : **A_**EAC3

  


  • Duration : 51 min 51 s

  


  • Bit rate mode : Constant

  


  


  Audio ----- Remuxed.mp4

  


  

  • ID : 2

  


  • Format : E-AC-3

  


  • Format/Info : Enhanced AC-3

  


  • Commercial name : Dolby Digital Plus

  


  • Codec ID : ec-3

  


  • Duration : 51 min 51 s

  


  • Bit rate mode : Constant

  


  


  The remux operation finished in about 1 minute for a 8Gb 4k video file, so I know there is no reencoding.

  


  I can see that .mp4 can take E-AC-3 Joint Object Control (JOC) with the demo files from Dolby labs.

  


  I've also remuxed an MKV to MKV and able to see the same result. The JOC markings have been removed with FFMPEG

  


  Thanks in advanced.

  


  David