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• How do I redirect the output of SpeechSynthesizer to a Process of ffmpeg

  27 septembre 2020, par TheOneAndOnlyMrX

  I am trying to have a SpeechSynthesizer generate some audio data, pipe it into a Process of FFmpeg, and have FFmpeg save the data to a file (output.wav). Eventually, the audio data will be used for something else, which is why I am using FFmpeg.

  


  using (MemoryStream voiceStream = new MemoryStream())
        using (Process ffmpeg = new Process())
        {
            SpeechSynthesizer synth = new SpeechSynthesizer();

            int samplesPerSecond = 48000;
            int bitsPerSample = 8;
            int channelCount = 2;
            int averageBytesPerSecond = samplesPerSecond * (bitsPerSample / 8) * channelCount;
            int blockalign = (bitsPerSample / 8) * channelCount;
            byte[] formatSpecificData = new byte[0];

            synth.SetOutputToAudioStream(
                voiceStream,
                new System.Speech.AudioFormat.SpeechAudioFormatInfo(
                    System.Speech.AudioFormat.EncodingFormat.Pcm,
                    samplesPerSecond,
                    bitsPerSample,
                    channelCount,
                    averageBytesPerSecond,
                    blockalign,
                    formatSpecificData
                    )
                );

            synth.Speak("Hello there");

            synth.SetOutputToNull();

            ffmpeg.StartInfo = new ProcessStartInfo
            {
                FileName = "ffmpeg",
                Arguments = $"-y -f u8 -ac 2 -ar 48000 -i pipe:0 out.wav",
                UseShellExecute = false,
                RedirectStandardOutput = true,
                RedirectStandardInput = true
            };

            ffmpeg.Start();

            using (Stream ffmpegIn = ffmpeg.StandardInput.BaseStream)
            {
                voiceStream.CopyTo(ffmpegIn);
                
                ffmpegIn.FlushAsync();
            }
        }


  


  When running the program, FFmpeg said that the input stream contains no data, and returns an empty file.
I believe that I do not interface properly with the Process object, however, the problem might also be my incorrect specification of the audio stream, since I do not know much about audio.

  


• what is AV_SAMPLE_FMT_FLT

  21 décembre 2020, par Golu

  SwrContext *swr_ctx = swr_alloc_set_opts(NULL,                          
                        AV_CH_LAYOUT_STEREO,
                        AV_SAMPLE_FMT_FLT,
                        sample_rate,
                        pCodecParameters->channel_layout,                                                                               
                  
                        pCodecParameters->format,
                        pCodecParameters->sample_rate,                          
                        0,
                        NULL);


  


  what exactly AV_SAMPLE_FMT_FLT is ? i already read docs but i want to know that what is float layout means in the context of Audio. How actually binary data of audio will look in that format.

  


• Firebase Function using ffmpeg successful with emulator, out of memory when deployed

  25 septembre 2024, par flyingL123

  I need some help. I have a .mov file in Firebase Storage. The file is 25 seconds long and 106 MB. I wrote a callable Firebase function that uses ffmpeg to convert the file to a .mp4 file and save it to Firebase Storage. When I test the function using the Functions emulator, it works without issue. The function returns successfully and I see the converted file appear in storage. The converted video is about 6 MB and plays correctly when dowloaded.

  


  When I deploy this function and run it in production on the exact same video file, the function fails with :

  


  


  'Memory limit of 256 MiB exceeded with 407 MiB used. Consider
increasing the memory limit, see
https://cloud.google.com/functions/docs/configuring/memory'

  


  


  As a test, I edited the function and changed its allocated memory to 1 GiB. Then I test the function again in production. Now I receive the same error :

  


  


  'Memory limit of 1024 MiB exceeded with 1029 MiB used. Consider
increasing the memory limit, see
https://cloud.google.com/functions/docs/configuring/memory'

  


  


  This is my function code :

  


  const {initializeApp} = require("firebase-admin/app");
const {onCall} = require("firebase-functions/v2/https");
const { getStorage, getDownloadURL } = require('firebase-admin/storage');

initializeApp();

exports.convertVideo = onCall((request) => {
  const ffmpegPath = require('@ffmpeg-installer/ffmpeg').path;
  const ffmpeg = require('fluent-ffmpeg');
  ffmpeg.setFfmpegPath(ffmpegPath);
  const originalLocation = request.data.originalLocation;
  const convertedLocation = request.data.convertedLocation;
  const originalVideoFile = getStorage().bucket().file(originalLocation);
  const newVideoFile = getStorage().bucket().file(convertedLocation);

  return new Promise(async (resolve, reject) => {
    await originalVideoFile.download({destination: '/tmp/original'}).catch(console.error);
    
    ffmpeg('/tmp/original')
      .addOutputOptions('-movflags +frag_keyframe+separate_moof+omit_tfhd_offset+empty_moov')
      .format('mp4')
      .on('error', (err) => {
        console.log(err);
      })
      .pipe(newVideoFile.createWriteStream())
      .on('error', (err) => {
        console.log(err);
      })
      .on('close', async () => {
        fs.unlink('/tmp/original', (err) => {
          if (err) throw err;
        });
        const convertedUrl = await getDownloadURL(newVideoFile);
        resolve([convertedLocation, convertedUrl]);
      });
  });
});


  


  I am sending a test request to the Function emulator using curl :

  


  curl -d '{"data": {"originalLocation": "customer_videos/original_video.mov", "convertedLocation": "customer_videos/converted/original_video.mp4"}}' -H "Content-Type: application/json" http://127.0.0.1:5001/foo/bar/convertVideo


  


  This works correctly. I send the same request to the deployed function, and receive the out of memory error.

  


  curl -d '{"data": {"originalLocation": "customer_videos/original_video.mov", "convertedLocation": "customer_videos/converted/original_video.mp4"}}' -H "Content-Type: application/json" https://convertvideo-foobarbaz-uc.a.run.ap


  


  Can somebody please help me understand why this is happening ? I didn't think I was doing anything too memory intensive, especially since it works correctly using the emulator.