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• Saving Video From URL as MP3 in Firebase Storage

  4 janvier 2024, par Christopher Frydryck

  I am working on a problem I have been stumped on the past couple days. I am using Node.js with Express (v4.18.2) to eventually create a Firebase deployment that can take in a video URL and output an audio mp3 to the Firebase Firestore. I have made some progress, but am still unsuccessful in some areas.

  


  I cannot save the file locally using fs, but for this example I have shown that it works with FS. I am successfully saving a local .mp3 file.

  


  First a few functions I have :

  


  async function downloadVideo(videoUrl) {
    try {
      const response = await axios.get(videoUrl, {
        responseType: 'stream',
      });
  
      if (response.status === 200) {
        return response.data;
      } else {
        throw new Error('Failed to fetch the video');
      }
    } catch (error) {
      throw new Error('Error fetching the video: ' + error.message);
    }
  }


  


  async function extractAudioFromVideo(videoUrl) {
    try {
      const videoStream = await downloadVideo(videoUrl);
  
      // Create a PassThrough stream to pipe the video data
      const passThrough = new PassThrough();
      videoStream.pipe(passThrough);

      const outputFile = 'output.mp3';
      const outputStream = fs.createWriteStream(outputFile);
  
        return new Promise((resolve, reject) => {
            const audioBuffers = [];

            passThrough.on('data', chunk => {
                audioBuffers.push(chunk)
                outputStream.write(chunk); // Write chunks to a local file
              });
        
              passThrough.on('error', err => {
                reject(err);
              });
        

            ffmpeg()
            .input(passThrough)
            .output('/dev/null') // Null output as a placeholder
            .outputOptions('-vn') // Extract audio only
            .noVideo()
            .audioQuality(0)
            .audioCodec('libmp3lame') // Set audio codec
            .format('mp3')
            .on('end', () => {
                const audioBuffer = Buffer.concat(audioBuffers)
                if (audioBuffer.length > 0) {
                    resolve(audioBuffer);
                  } else {
                    reject(new Error('Empty audio buffer'));
                  }
              })
            .on('error', err => reject(err))
            .run();
        })
    } catch (error) {
      throw new Error('Error extracting audio: ' + error.message);
    }
  }


  


   async function saveAudioToFirebase(audioBuffer, fileName) {
    try {
        let storage = admin.storage()
    let storageRef = storage.bucket(serviceAccount.storage_bucket_content)
      const file = storageRef.file(fileName) // Specify the desired file name here

      const renamedFileName = fileName.replace(/\.[^/.]+$/, '.mp3'); // Change the file extension to .mp3
  
      await file.save(audioBuffer, {
        metadata: {
          contentType: 'audio/mpeg', // Adjust the content type as needed
        },
      });

      await file.setMetadata({
        contentType: 'audio/mpeg'
      })

      await file.move(renamedFileName); // Rename the file with the .mp3 extension
  
      console.log('Audio saved to Firebase Storage.');
    } catch (error) {
      console.error('Error saving audio to Firebase Storage:', error);
    }
  }



  


  What works :

  


  

  • Downloading the video via Axios

  


  • Saving to Firebase storage (no intializing or pointer issues to Firebase)

  


  • Outputting a local .mp3 file called "output.mp3"

  


  • I am able to log the result of extractAudioFromVideo and get a buffer logged in my terminal

  


  


  What doesn't work :

  


  

  • Saving a file to Firebase Storage that is an .mp3. It says ".mp3" in the url and it has a content type of 'audio/mpeg' but it is in fact an .mp4. Still has video and plays video in the browser window.

  


  


  I am willing to use other libraries like tmp if suggested and the solution works.

  


• Unable to play video from firebase cloud storage download url on Iphone Safari [closed]

  26 janvier 2024, par Acid Coder

                      getDownloadURL(ref)
                        .then(url => {
                            //... save the url to state
                        })


  


  front end : React

  


                              &#xA;                                <source src="{videoURL}" type="video/mp4"></source>&#xA;                            &#xA;

  


  work fine on PC and Android, but on Iphone Safari, only 1 out of 10 videos can be played

  


  

  


  all video are from the same source, going through same compression, from mp4 to mp4

  


  import ffmpeg from 'fluent-ffmpeg'

        ffmpeg(inputPath)
            .output(outputPath)
            .videoCodec('libx264')
            .audioCodec('aac')
            .on('end', () => {
                // ...
            })
            .on('error', err => {
                // ...
            })
            .run()


  


• aarch64 : Manually tweak vertical alignment/indentation in tx_float_neon.S

  17 octobre 2023, par Martin Storsjö

  aarch64 : Manually tweak vertical alignment/indentation in tx_float_neon.S
  Favour left aligned columns over right aligned columns.
  In principle either style should be ok, but some of the cases
  
  easily lead to incorrect indentation in the surrounding code (see
  
  a couple of cases fixed up in the preceding patch), and show up in
  
  automatic indentation correction attempts.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] libavutil/aarch64/tx_float_neon.S