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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.

  


• How can I play audio file(.mp3, .flac, .wav) and then loop over it (mix every few seconds) another audio file(wav) using ffmpeg

  11 mars 2019, par lukistar

  I got two different commands.

  ffmpeg -i input.mp3 -i second.mp3 -filter_complex "[0:a]atrim=end=10,asetpts=N/SR/TB[begin];[0:a]atrim=start=10,asetpts=N/SR/TB[end];[begin][1:a][end]concat=n=3:v=0:a=1[a]" -map "[a]" output

  This command inserts second.mp3 into input.mp3. It seems to always keep the parameters of input.mp3. It inserts it in exact 10 seconds of input.mp3.

  Here is the second command :

  ffmpeg -i input.mp3 -i second.mp3 -filter_complex "[1:a]adelay=10000|10000[1a];[0:a][1a]amix=duration:first" output

  This command is closer to my final goal. It plays input.mp3 and in exact 10 seconds it plays along second.mp3 without stopping input.mp3’s sound.(I think that’s called mixing ?)

  My final goal is to create final.mp3.

  Its duration must always equal input.mp3 duration. It must keep the samplerate, the count of channels, etc of input.mp3

  When playing final.mp3, it must play the whole input.mp3.
  But each 10-15 seconds, it must play second.mp3 without stopping input.mp3.(mix)
  It could be said that I must use "Second command" but in a loop.
  It would be great if there is one-line command for that in ffmpeg.
  I am working with flac, mp3 and wav and both of the commands were suitable for that.

  For example :

  input.mp3 could be 40 seconds long.

  second.mp3 could be 2 seconds long.

  When I play final.mp3 it will be 40 seconds long, but each 10-15 seconds(on random) it will play second.mp3 at the same time as input.mp3.

  Sadly I have no experience with ffmpeg, both of the commands I got are answers to questions here in stackoverflow. Hope somebody can help me. Thank you !

• I want to save a video with effects applied on it. OnSucccess is not calling [duplicate]

  10 novembre 2016, par shriya

  This question already has an answer here :

  • What is a NullPointerException, and how do I fix it ?
    
    12 answers
    

  This is command string which i want to process.

  String[] command = new String[]"ffmpeg -y -i " + old_video_path + " -strict experimental -vf curves=vintage -s 240x320 -r 30 -aspect 4:3 -ab 48000 /storage/emulated/0/video.mp4" ;
  executeFFmpeg(command) ;

  private void executeFFmpeg(String[] cmd) {
  
      try {
  
          ffmpeg.execute(cmd, new ExecuteBinaryResponseHandler() {
  
  
  
              @Override
  
              public void onStart() {
  
                  Log.e("Progress", "onStart");
  
              }
  
  
  
              @Override
  
              public void onProgress(String message) {
  
                  Log.e("Progress", "onProgress");
  
              }
  
  
  
              @Override
  
              public void onSuccess(String message) {
  
                  Log.e("Progress", "onSuccess");
  
              }
  
  
  
              @Override
  
              public void onFailure(String message) {
  
                  Log.e("Progress", "onFailure" + message);
  
              }
  
  
  
              @Override
  
              public void onFinish() {
  
  
  
                  Log.e("Progress", "onFinish");
  
  
  
              }
  
          });
  
      } catch (FFmpegCommandAlreadyRunningException e) {
  
          // Handle if FFmpeg is already running
  
      }
  
  }

  in Log i am getting onProcess call and onFininsh call. How do i write code to save this video in sdcard and where ?