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• Bash : bash script to download trimmed mp3 from youtube url

  23 février 2017, par Bhishan Poudel

  I would like to download the initially x seconds trimmed mp3 from a video url of youtube.
  I found that youtube-dl can download the video from youtube to local machine. But, when I looked at the man pages of youtube-dl, I could not find any trim options.

  So I tried to use the ffmpeg to trim downloaded mp3 file.
  Instead of doing this is two steps, I like to write one bash script which does the same thing.
  My attempt is given below.

  However, I was stuck at one place :
  "HOW TO GET THE VARIABLE NAME OF OUTPUT MP3 FILE FROM YOUTUBE-DL ?"
  The script is given below :

  # trim initial x seconds of mp3 file
  
  # e.g. mytrim https://www.youtube.com/watch?v=dD5RgCf1hrI 30
  
  function mytrim() {
  
      youtube-dl --extract-audio --embed-thumbnail --audio-format mp3 -o "%(title)s.%(ext)s" $1
  
      ffmpeg -ss $2 -i $OUTPUT_MP3 -acodec copy -y temp.mp3
  
      mv temp.mp3 $OUTPUT_MP3
  
      }

  How to get the variable value $OUTPUT_MP3 ?
  echo "%(title)s.%(ext)s" gives the verbatim output, does not give the output filename.

  How could we make the script work ?

  The help will be appreciated.

• FFmpeg : real-time buffer[ ] [input] too full or near too full (101% of size : 3041280 [rtbufsize parameter]) frame dropped

  5 janvier 2017, par lostin2010

  I use the library of ffmpeg to decode stream from [TTQ HD Camera] and encode it to a rtmp stream.
  but I receive a lot of warnings like the picture below.
  i try to set qmin and qmax , it seems a little better. but still not totally resolve the problem.

  encoder_context->qmin = 10;
  
  encoder_context->qmax = 51;

  who knows this is why ?

  [dshow @ 04bfc640] real-time buffer [TTQ HD Camera] [video input] too full or near too full (101% of size: 3041280 [rtbufsize parameter])! frame dropped!

  

• Download,modify and upload video with S3

  9 février 2017, par Gold Fish

  I’m trying to write a Lambda function in nodejs that will download a file from S3 bucket, modify it, and then upload it back to another S3 bucket. For some reason, the algorithm prints the ’Modify Video’ log and then finishes and exit without error. What am I doing wrong ?

  var AWS = require('aws-sdk');
  
  var util = require('util');
  
  var ffmpeg = require('fluent-ffmpeg');
  
  var s3 = require('s3');
  
  
  
  // get reference to S3 client
  
  
  
  var awsS3Client = new AWS.S3();
  
  var options = {
  
    s3Client: awsS3Client,
  
  };
  
  var client = s3.createClient(options);
  
  
  
  exports.handler = function(event, context, callback) {
  
      // Read options from the event.
  
      console.log("Reading options from event:\n", util.inspect(event, {depth: 5}));
  
      var srcBucket = event.Records[0].s3.bucket.name;
  
      // Object key may have spaces or unicode non-ASCII characters.
  
      var srcKey    =
  
      decodeURIComponent(event.Records[0].s3.object.key.replace(/\+/g, " "));
  
      var dstBucket = srcBucket + "-dst";
  
      var dstKey    = "mod_" + srcKey;
  
  
  
      var dwnld_file_name = '/tmp/vid.mp4';
  
      var mdfy_file_name = '/tmp/mod_vid.mp4';
  
  
  
      // Sanity check: validate that source and destination are different buckets.
  
      if (srcBucket == dstBucket) {
  
          callback("Source and destination buckets are the same.");
  
          return;
  
      }
  
  
  
      // Infer the video type.
  
      var typeMatch = srcKey.match(/\.([^.]*)$/);
  
      if (!typeMatch) {
  
          callback("Could not determine the video type.");
  
          return;
  
      }
  
      var videoType = typeMatch[1];
  
      if (videoType != "mp4") {
  
          callback('Unsupported video type: ${videoType}');
  
          return;
  
      }
  
      console.log("Source bucket: ", srcBucket);
  
      console.log("srcKey: ", srcKey);
  
      console.log("Dest bucket: ", dstBucket);
  
      console.log("dstKey: ", dstKey);
  
  
  
      var params = {
  
        localFile: dwnld_file_name,
  
  
  
        s3Params: {
  
          Bucket: srcBucket,
  
          Key: srcKey,
  
        },
  
      };
  
      console.log("params for download: ", params);
  
      var downloader = client.downloadFile(params);
  
      downloader.on('error', function(err) {
  
        console.error("unable to download:", err.stack);
  
        callback("unable to download");
  
      });
  
      downloader.on('end', function() {
  
        console.log("done downloading");
  
        console.log("modify video");
  
        ffmpeg(dwnld_file_name)
  
            .setStartTime('00:00:01')
  
            .setDuration('1').output(mdfy_file_name).on('end', function() {
  
              console.log('Finished processing');
  
              params = {
  
                localFile: mdfy_file_name,
  
                //localFile: dwnld_file_name,
  
                s3Params: {
  
                  Bucket: dstBucket,
  
                  Key: dstKey,
  
                },
  
              };
  
              console.log("params for upload: ", params);
  
              var uploader = client.uploadFile(params);
  
              uploader.on('error', function(err) {
  
                console.error("unable to upload:", err.stack);
  
                callback("unable to upload");
  
              });
  
              uploader.on('end', function() {
  
                console.log("done uploading");
  
                callback('done');
  
                return;
  
              });
  
          });  //
  
      });
  
  };