Recherche avancée

Sur d’autres sites (3229)

• Popen ffmpeg process hang if run in shell and leaves a defunct process if run in background

  12 janvier 2023, par dr__noob

  I have a script that runs the FFmpeg command. When I run the command in the background using the & operator it runs fine but leaves a zombie process. And when I remove the operator the process hangs and goes into the pipe_wait state.

  


  The code used to execute the FFmpeg command

  


  def run_cmd(cmd:str,
            check:bool=False,       
            capture:bool=False,
            timeout:float=None,
            ) -> tuple[int,bytearray,bytearray]:
    import  subprocess

    stdout_data,stderr_data = (bytearray(),bytearray()) if capture else (None,None)
    try:
        sp = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE, )
        while any(data:=(sp.stdout.readline(),sp.stderr.readline())):
            out,err = data
            if out: stdout_data += out
            if err: stderr_data += err
        sp.communicate(timeout=timeout)
        return sp.returncode,stdout_data,stderr_data
    except subprocess.CalledProcessError as e:
        print("Called process error")
        raise e
    except subprocess.TimeoutExpired as e:
        sp.kill()
        print(f"{sp.pid} killed")
        if check:
            raise e
    except PermissionError as e:
        print("Permission error")
        if check:
            raise e


  


  The command which is causing the issue is

  


  nice -n 10 ffmpeg -loglevel verbose -hide_banner -y -threads 0 -i "/dev/shm/480TEST-1999963.dfw.480_1673030704/SBS_Plus_Test_Feed.480TEST-1999963.480.eng.p.intermediate.mp4" -map 0:v:0? -q:v 1 -f rawvideo -pix_fmt "yuv420p" -an ./SBS_Plus_Test_Feed.480TEST-1999963.480.eng.p_fifo_video.yuv -map 0:a:0? -q:a 1 -ac 2 -af "aresample=async=1:first_pts=0" -vn ./SBS_Plus_Test_Feed.480TEST-1999963.480.eng.p_fifo_audio.wav > "./SBS_Plus_Test_Feed.480TEST-1999963.480.eng.p.ffmpeg.demux.log" 2>&1 &


  


  However, other FFmpeg commands are running fine without the last &. But this command will block if I remove the &. If I keep it as it is, the process will later become a zombie(defunct). Can it be because it is actually a nice -n 10 causing the issue ?

  


  Example of a command running fine

  


  ffmpeg -loglevel verbose -hide_banner -y -threads 0 -i "./SBS_Plus_Test_Feed.480TEST-1999963.480.eng.p.ts" -r "59.94" -s:v "1280"x"720" -pix_fmt "yuv420p" -vcodec libx264 -x264-params qp="30" -af "aresample=async=1:first_pts=0" -crf 0 -q:a 1 -vf yadif=1 ./SBS_Plus_Test_Feed.480TEST-1999963.480.eng.p.intermediate.mp4 > "./p.intermediate.mp4.intermediate.ffmpeg.log" 2>&1


  


  Till now I have tried other options like -nostdin and null suggested in ffmpeg hangs when run in background

  


  Is there any other way run this without creating a zombie ?

  


• 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.

  


• Trying to merge two videos from my photo roll with Flutter ffmpeg without success

  4 avril 2023, par Stéphane de Luca

  My goal is to merge too video I pick from my photo roll.
My code starts as follows :

  


  // videos[0] contains: "content://media/external/video/media/2779"
 final v1 = await videos[0].getMediaUrl();
    if (v1 == null) return;
    final v1Path = await LecleFlutterAbsolutePath.getAbsolutePath(uri: v1);


  


  But printing v1Pathgive a path with jpeg extension :
/data/user/0/com.example.shokaze/cache/OutputFile_1669939088711.jpeg' which I though would have bear mp4` as it is a video.

  


  Why is it so ?

  


  Another question I have is how can I make a relevant path so that the ffmpeg video appears in my roll after its creation ? Should I do the following and provide outputPathto the code ?

  


  The command it executes is :
-i /data/user/0/com.example.shokaze/cache/OutputFile_1669940421875.jpeg -i /data/user/0/com.example.shokaze/cache/OutputFile_1669940428723.jpeg -filter_complex '[0:0][1:0]concat=n=2:v=1:a=0[out]' -map '[out]' /data/user/0/com.example.shokaze/app_flutter/output.mp4

  


  And I get an error :
I/flutter (30190): error 1

  


  My code is as follows :

  


      String output = "content://media/external/video/media/output";
    final outputPath = await LecleFlutterAbsolutePath.getAbsolutePath(uri: output);
    if (outputPath == null) return;


  


  The full code is as follows :

  


  // Makes the final video by merging all videos from the mixing table
  void makeFinalVideo() async {
    if (videos.length < 2) return;

    final v1 = await videos[0].getMediaUrl();
    if (v1 == null) return;
    final v1Path = await LecleFlutterAbsolutePath.getAbsolutePath(uri: v1);
    if (v1Path == null) return;
    //String v1 = "";
    final v2 = await videos[1].getMediaUrl();
    if (v2 == null) return;
    final v2Path = await LecleFlutterAbsolutePath.getAbsolutePath(uri: v2);
    if (v2Path == null) return;
    String output = "content://media/external/video/media/output";
    final outputPath = "";
    // await LecleFlutterAbsolutePath.getAbsolutePath(uri: output);
    // if (outputPath == null) return;

    Video.merge(v1Path, v2Path, outputPath);
  }



class Video {
  /// Merges the video [v1] with [v2] as [output] video located in app doc path
  static void merge(String v1, String v2, String output) async {
    final appDocDir = await getApplicationDocumentsDirectory();

    //final appDir = await syspaths.getApplicationDocumentsDirectory();
    String rawDocumentPath = appDocDir.path;
    final outputPath = '$rawDocumentPath/output.mp4';

    final command =
        '-i $v1 -i $v2 -filter_complex \'[0:0][1:0]concat=n=2:v=1:a=0[out]\' -map \'[out]\' $outputPath';
    //await execute(command);
    try {
      final r = await FFmpegKit.execute(command);

      //.then((rc) => print("FFmpeg process exited with rc $rc"));
      print("Result: $r");
    } catch (e) {
      print("Exception: $e");
    }
  }
}