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• Error : [Error : ENOENT : no such file or directory, open './1695556319341.mp3']

  24 septembre 2023, par James

  I'm trying to convert an mp4 file to an mp3 file and then directly upload it to Firebase storage without saving it locally in my machine, How can I do that currently I'm getting an error when I try to do that the error is "Error : [Error : ENOENT : no such file or directory, open './1695556319341.mp3']" How can i fix this issue with my Node.js code and make things work ?

  


  import { initializeApp } from "firebase/app";
import { getStorage, ref, getDownloadURL, uploadBytesResumable } from "firebase/storage";
import serviceAccount from '../firebase/serviceAccountKey';
import { path as ffmpegPath } from '@ffmpeg-installer/ffmpeg';
import ffmpeg from 'fluent-ffmpeg';
import { readFile, unlink } from 'fs/promises';

initializeApp(serviceAccount);
ffmpeg.setFfmpegPath(ffmpegPath);

async function convertMP4ToMP3AndUploadToFirebase(inputPath: any, firebaseStoragePath: any) {
    const date = Date.now();
    const outputPath = `./${date}.mp3`;

    try {
        await ffmpeg(inputPath)
            .output(outputPath)
            .audioCodec('libmp3lame')
            .format('mp3')
            .run();

        const storage = getStorage();
        const storageRef = ref(storage, firebaseStoragePath);

        const fileBuffer = await readFile(outputPath);
        const metadata = { contentType: 'audio/mpeg' };
        const uploadTask = uploadBytesResumable(storageRef, fileBuffer, metadata);
        const snapshot = await uploadTask;
        const downloadURL = await getDownloadURL(snapshot.ref);
        await unlink(outputPath);

        console.log('MP4 file converted to MP3 and uploaded to Firebase Storage successfully!');
        console.log('Download URL:', downloadURL);
    } catch (error) {
        console.error('Error:', error);
    }
}

const inputPath = './video.mp4';
const date = Date.now();
const firebaseStoragePath = `./${date}.mp3`;

convertMP4ToMP3AndUploadToFirebase(inputPath, firebaseStoragePath);


  


• Cannot open RTMP stream with FFMPEG Java Cannot assign requested address

  12 novembre 2023, par lastpeony4

  I am trying to open an RTMP stream with avformat_open_input and for some reason i keep getting Cannot assign requested address error.
  
My RTMP URL is correct because i can watch the stream using VLC Player and ffmpeg command line :
  
ffmpeg -i rtmp://1.1.1.1/app/teststream -vcodec copy -acodec copy output.mp4

  


  int timeout = 2500;
setConnectionTimeout(timeout);

AVDictionary optionsDictionary = new AVDictionary();

String timeoutStr = String.valueOf(this.timeoutMicroSeconds);
av_dict_set(optionsDictionary, "timeout", timeoutStr, 0);

int analyzeDurationUs = 1500 * 1000;
String analyzeDuration = String.valueOf(analyzeDurationUs);
av_dict_set(optionsDictionary, "analyzeduration", analyzeDuration, 0);

int ret;

if ((ret = avformat_open_input(inputFormatContext, streamUrl, null, optionsDictionary)) < 0) {
  // ERROR Cannot assign requested address
}


  


  I am using org.bytedeco:ffmpeg:5.1.2-1.5.8 (ffmpeg-5.1.2-1.5.8.jar)

  


  Why i can't open it ?

  


• What open source software would be best for reading in raw data from an SDR / USRP and decoding ATSC1.0 video and playing it ?

  18 août 2023, par railsnoob

  I've had luck with GNU Radio for ATSC1.0 decode from USRP data and sending the mpeg transport stream to VLC to be played but eventually I would like to have other DTV standards decoded.

  


  I started looking into packages with full DTV support and saw that VLC has TV tuner control/access, but if I have a USRP I'm not sure I could configure VLC to control that, or if I'd even want it to. But since it can go from tuner control to video playback there must be a command/configuration which just has it read from a raw data file that I captured from the USRP, right ?

  


  Does anyone know how to go from raw captured ATSC channel to MPEG transport stream on VLC, FFMPEG, or any other software packages ?