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• QT paly audio by QAudioDevidce can't connect to PulseAudioService

  30 mars 2022, par XMingG

  Like title, i'm trying to use Qt and FFmpeg to play audio. My code like this :

  


  QAudioOutput *audio_output;

    QIODevice *stream_out;

    QAudioFormat audio_fmt;
    audio_fmt.setSampleRate(44100);
    audio_fmt.setChannelCount(2);
    audio_fmt.setSampleSize(16);
    audio_fmt.setCodec("audio/pcm");
    audio_fmt.setByteOrder(QAudioFormat::LittleEndian);
    audio_fmt.setSampleType(QAudioFormat::SignedInt);
    
    QAudioDeviceInfo info = QAudioDeviceInfo::defaultOutputDevice();
    if(!info.isFormatSupported(audio_fmt))
    {
        audio_fmt = info.nearestFormat(audio_fmt);
    }
    
    audio_output = new QAudioOutput(audio_fmt);


  


  When i use QAudioDeviceInfo info = QAudioDeviceInfo::defaultOutputDevice()
i get PulseAudioService : pa_context_connect() failed error.
So how can i fix it ?
By the way, i'm using Ubuntu 16.04 and Qt 5.14.2, and i have add 'mutilmedia' to Qt pro file

  


  I checked my Qt file ,and i have audio dir in plugins, it's not lib problem. Also, i read this post ,but i don't know how to fix it, anybody have idea ? Thank you guys,and my English is bad, wish you can understand what do i say.

  


• FFMpeg doesn't make a blued video on S3

  15 juin 2022, par uekyo

  I want to make a blued video but after running the below code, 48 bite file just appears. I tried mp3 file to transfer to wave then it worked well. Do you guys have any suggestions to make this solution ?

  


  import json
import os
import boto3

def lambda_handler(event, context):
    # boto3 client
    s3 = boto3.client("s3")

    # replace below configuration
    bucket_name = "testestest"
    key = "video1.mp4"

    # downloading file to /tmp directory within lambda
    lambda_file_path = f"/tmp/{key}"
    lambda_output_file_path = "/tmp/trancoded_english_audio.mp4"

    # downloading file
    s3.download_file(bucket_name, key, lambda_file_path)

    # transcoding
    os.system(f'/opt/ffmpeglib/ffmpeg -i {lambda_file_path} -vf "gblur=sigma=50" -c:a copy {lambda_output_file_path}')

    # uploading transcoded file
    s3.upload_file(
        Bucket=bucket_name,
        Key=lambda_output_file_path.split("/")[-1],
        Filename=lambda_output_file_path,
    )

    return {"statusCode": 200, "body": json.dumps("Hello from Srce Cde!")}


  


• i m not able to play my video in my phone after merging through ffmpeg in flutter ?

  16 juin 2021, par Muhammad Arbaz Zafar

  this is my code

  


  void _videoMerger() async {


    final appDir = await syspaths.getApplicationDocumentsDirectory();
    String rawDocumentPath = appDir.path;
    final outputPath = '$rawDocumentPath/outputPath.mp4';
    final FlutterFFmpeg _flutterFFmpeg = new FlutterFFmpeg();
    String commandToExecute = ' -i ${_storedVideoOne.path} -i ${_storedVideoTwo.path} -filter_complex "[0:v][1:v]concat=n=2:v=1:a=0[out]" -map "[out]" $outputPath.mp4';
    _flutterFFmpeg.execute(commandToExecute).then((rc) => print("FFmpeg process exited with rc $rc"));

    await MediaStore.saveFile(outputPath);

  }


  


  my video merged and i get file in my mobile and then i try to play but its not able to play after that i built my code in emulator and merge vide then merge video successfuly but still not able to play my merge video so guys any solution ?