Recherche avancée

Sur d’autres sites (7813)

• The System Audio not included when recording screen using tab capture api

  21 septembre 2024, par alpecca

  I am working on a chrome extension that let user record their current tab video + the current system audio for example playing a music on the tab. I read the docs on the web about preserve audio on tab capture api and the audio constraint to set to be true

  


  chrome.tabCapture.capture({
        video: true,
        audio: true,


  


  const stream = await new Promise<mediastream null="null">((resolve, reject) => {&#xA;    chrome.tabCapture.capture({&#xA;        video: true,&#xA;        audio: true,&#xA;        videoConstraints: {&#xA;            &#xA;            mandatory: {&#xA;                minFrameRate: 60,&#xA;                maxFrameRate: 60,&#xA;                minWidth: 1920, &#xA;                minHeight: 1080, &#xA;                maxWidth: 1920,&#xA;                maxHeight: 1080,&#xA;            }&#xA;        }&#xA;    }, (stream: MediaStream | null) => {&#xA;        if (chrome.runtime.lastError) {&#xA;            return reject(new Error(chrome.runtime.lastError.message));&#xA;        }&#xA;        resolve(stream);&#xA;    });&#xA;});&#xA;</mediastream>

  


  In the above code, when I set the audio to be true and try to record the screen, the final output doesn't contain any audio.

  


  Here is the Media Recorder values :-

  


  const recorder = new MediaRecorder(stream, {
            mimeType: 'video/webm;codecs=H264',
            videoBitsPerSecond: 8000000
        });

        recorder.ondataavailable = (e: BlobEvent) => {
            socketRef.send(e.data)
           
        }
  
        recorder.start(2000);


  


  And also my ffmpeg in the backend to handle the incoming stream :-

  


  command = [
        'ffmpeg', 
        '-y',
        '-i', 
        '-', 
        '-codec:v', 
        'copy', 
        '-codec:a', 
        'copy', 
        '-y',
        '-f', 'mp4',
        recordingFile,
        # "-"
        # f'output{queueNumber}.mp4',
    ]


  


  Any help would be greatly appreciated :)

  


• System.IO.IOException : Pipe is broken error with FFMpegCore library

  14 octobre 2024, par secretply

  I am looking to retrieve the loudnorm data in JSON format from FFmpeg (using FFMpegCore 5.1.0). This is the code I currently have :

  


  await FFMpegArguments
    .FromPipeInput(new StreamPipeSource(fileStream.OpenReadStream()))
    .OutputToPipe(new StreamPipeSink(outputStream), options => options.WithCustomArgument("-af loudnorm=print_format=json"))
    .ProcessAsynchronously();


  


  This is the exception I get, which is similar to this old GitHub issue.

  


  System.IO.IOException: 'Pipe is broken.'

This exception was originally thrown at this call stack:
    System.IO.Pipes.PipeStream.PipeValueTaskSource.GetResult(short)
    System.IO.Pipes.PipeStream.PipeValueTaskSource.System.Threading.Tasks.Sources.IValueTaskSource.GetResult(short)
    System.IO.Stream.CopyToAsync.__Core|27_0(System.IO.Stream, System.IO.Stream, int, System.Threading.CancellationToken) in Stream.cs
    FFMpegCore.Arguments.InputPipeArgument.ProcessDataAsync(System.Threading.CancellationToken)
    FFMpegCore.Arguments.PipeArgument.During(System.Threading.CancellationToken)
    FFMpegCore.FFMpegArguments.During(System.Threading.CancellationToken)
    FFMpegCore.FFMpegArgumentProcessor.Process(Instances.ProcessArguments, System.Threading.CancellationTokenSource)
    FFMpegCore.FFMpegArgumentProcessor.ProcessAsynchronously(bool, FFMpegCore.FFOptions)


  


  I am trying to replicate the following FFmpeg command and JSON output :

  


  ffmpeg -i "file.flac" -af loudnorm=print_format=json -f null -


  


  {
        "input_i" : "-21.87",
        "input_tp" : "-7.13",
        "input_lra" : "5.00",
        "input_thresh" : "-32.04",
        "output_i" : "-24.76",
        "output_tp" : "-10.36",
        "output_lra" : "4.10",
        "output_thresh" : "-34.84",
        "normalization_type" : "dynamic",
        "target_offset" : "0.76"
}


  


  If I add .ForceFormat("null") to the OutputToPipe options, I do not get the exception but when I read the output stream, it returns an empty string. In the issue mentioned, I know they mentioned a way to get the FFMpegErrorOutput property but I do not know how that can be done. I could not find an example of outputting a stream as JSON. If anyone can point me in the right direction or can provide an alternative solution, I would greatly appreciate it.

  


• Python ffmpeg : [WinError 2] The system cannot find the file specified [duplicate]

  21 novembre 2024, par PeppersONLY

  #what i did to install

pip install ffmpeg-python


  


  #code

import ffmpeg

crop_dimensions = "640:480:0:0"

input_file = "input.mp4"
output_file = "output.mp4"

(
    ffmpeg
    .input(input_file)
    .filter("crop", *crop_dimensions.split(":"))
    .output(output_file, vcodec="libx264", crf=22)
    .overwrite_output()
    .run()
)


  


  Whenever I run this code, I get this error :

  


      hp, ht, pid, tid = _winapi.CreateProcess(executable, args,
                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
FileNotFoundError: [WinError 2] The system cannot find the file specified


  


  I tried reinstalling the library but that didn't seem to work.