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• How to download audio and video as separate files and specify the output format and filename for each ?

  14 novembre 2023, par Taako

  I'd like to download a video as separate files for both audio and video and have them named [video_id]-audio.wav and [video_id]-video.mp4

  


  How do i get yt-dlp to download the video and audio separately, then convert each to the specified output format and rename them as such ?

  


  Right now I can get them each downloaded separately but the naming isnt working out.

  


  I could also use ffmpeg separately to convert the video and audio formats after they are downloaded, so all i really need is to have the audio and video files downloaded and named

  


  Right now my args are

  


  YT_OPTIONS = {
    'format': 'bestvideo[height<=720]+bestaudio/best[height<=720]',
    'extractaudio': True,
    'keepvideo': True,
    'outtmpl': '%(id)s-%(format)s.%(ext)s',
    'restrictfilenames': True,
    'noplaylist': True
}


  


  but the format is just coming out as 247_-_1280x720_720p_+251_-_audio_only_medium and whats worse is it is the same for both the audio only and video only files just one has 251 and the other has 247.

  


• avformat/webmdashenc : Don't use custom option for bitexactness

  17 mars 2020, par Andreas Rheinhardt

  avformat/webmdashenc : Don't use custom option for bitexactness
  The WebM DASH Manifest muxer can write manifests for live streams and
  
  these contain an entry that depends on the time the manifest is written ;
  
  an AVOption to make the output reproducible has been added for tests.
  
  But this is unnecessary, as there already is a method for reproducible
  
  output : The AVFMT_FLAG_BITEXACT-flag of the AVFormatContext. Therefore
  
  this commit removes the custom option.
  Given that the description of said option contained "private option -
  
  users should never set this" and that it was not documented in
  
  muxers.texi, no deprecation period for this option seemed necessary.
  The commands of the FATE-tests for this muxer have been changed to no
  
  longer use this option.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavformat/webmdashenc.c
  • [DH] tests/fate/vpx.mak

• how to download portion of video which was uploaded into AWS s3 bucket, though Nodejs SDKs

  22 février 2024, par rama rangeswara reddy

  I have uploaded a 1GB .mp4 file to an AWS S3 bucket. Using the AWS-SDK provided by the npm package, I am able to download the entire video. However, I have a specific requirement to generate a thumbnail at the 6-second mark of the video. Currently, I download the entire 1GB video to my local machine and then generate the thumbnail at the desired duration.

  


  To optimize server resources and reduce disk load, I plan to download only the first 10 seconds of the video, which should be approximately 10MB or less in size. By doing so, I can significantly reduce download time and server load while still fulfilling my requirement of generating the thumbnail at the 6-second mark. Therefore, instead of downloading the entire 1GB video, I aim to download only the 10MB segment corresponding to the first 10 seconds of the video.

  


  I am using nodejs, expressJS, as backed Technologies.

  


  `

  


  `async function downloadS3FileToLocalDirAndReturnPath(videoKey) {
    return new Promise(async (resolve, reject) => {
        try {
            AWS.config.update({
                accessKeyId: config.AWS.KEYS.accessKeyId,
                secretAccessKey: config.AWS.KEYS.secretAccessKey,
                region: config.AWS.KEYS.region,
                httpOptions: config.AWS.KEYS.httpOptions
            });
            const s3 = new AWS.S3();

            // Specify the local file path where you want to save the downloaded video
            const localFilePath = `${os.tmpdir()}/${Date.now()}_sre.mp4`;

            // Configure the parameters for the S3 getObject operation
            const params = {
                Bucket: config.AWS.S3_BUCKET,
                Key: videoKey
            };

            const result = await s3.getObject(params).promise();
            const fileContent = result.Body;
            fs.writeFileSync(localFilePath, fileContent);
            resolve(localFilePath);
        } catch (error) {
            reject(error);
        }
    });
}`


  


  this code was working fine to download the whole video , but i need to download only first 10 seconds duration

  


  S3 : How to do a partial read / seek without downloading the complete file ?

  


  I tried this ,before posting this question with above post, video was downloading , it was not playing , by throwing this error , the file contains no playable streams

  


  async function generateThumbnails(videoKey) {

const s3 = new AWS.S3();

const params = {
    Bucket: KEYS.bucket,
    Key: videoKey, // Specify the key of the video file in S3
    Range: `bytes=0-${1024 * 800}`, // Specify the range of bytes you want to retrieve
};

const file = fs.createWriteStream(`/tmp/${Date.now()}_rama.mp4`);

const s3Stream = s3.getObject(params).createReadStream();

s3Stream.pipe(file);

s3Stream.on("error", (error) => {
    console.log("Error Occured while File downloading!! ");
});

s3Stream.on("finish", () => {
    console.log("File downloaded Successfully ");
});


  


  }