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• Writing an MP4 slideshow video to S3 using the Lambda FFmpeg Layer

  15 avril 2020, par Gracie

  I am using AWS Lambda with the FFmpeg layer to try and build a 15 second MP4 file (beach.mp4) - from 3 static images that show for 3, 5 and 7 seconds in sequence.
These 3 images are within my Lambda upload deployment zip on S3, along with the sequence.txt file needed for the function.

  



  SEQUENCE.TXT

  



  file beach1.jpg
outpoint 3
file beach2.jpg
outpoint 8
file beach3.jpg
outpoint 15

  



  FFMPEG COMMAND

  



  ffmpeg -f concat -i sequence.txt -c:v libx264 -tune stillimage -c:a aac -b:a 192k -pix_fmt yuv420p -shortest beach.mp4

  



  I am writing a file to S3, but it is blank, only 15 bytes. So doesn't contain the MP4 file created by FFmpeg. I think this has something to do with sync or streaming the video file so both the txt can be read and the MP4 can be written to a file, but not sure.

  



  How can I read the .txt contents and then write the ffmpeg command to a file in /tmp/ ?

  



  You can download or view the files at https://lifeisabeach.netlify.app/
(For some strange reason the MP4 length when built locally is 19 seconds, when it should be 15 !)

  



  const util = require('util');
const AWS = require('aws-sdk');
const s3 = new AWS.S3();
const { readFileSync, writeFileSync, unlinkSync, writeFile, readdir } = require('fs');
//const fs = require('fs');
const path = require('path');
const { spawnSync } = require('child_process');

exports.handler = async (event, context, callback) => {

    const outputBucket = 'mys3bucket';
    const sequenceTXT = "sequence.txt";

    // FFmpeg creates the file, using the contents of sequence.txt to create timed image slides
    const mp4create = await spawnSync(
        '/opt/bin/ffmpeg',
        [
            '-f',
            'concat',
            '-i',
            sequenceTXT,
            '-c:v',
            'libx264',
            '-tune',
            'stillimage',
            '-c:a',
            'aac',
            '-b:a',
            '192k',
            '-pix_fmt',
            'yuv420p',
            '-shortest',
            'beach.mp4'
        ]
    );

    // Write ffmpeg output to a file in /tmp/
    const writeMP4File = util.promisify(writeFile);
    await writeMP4File('/tmp/beach.mp4', mp4create, 'binary');
    console.log('MP4 content written to /tmp/');

    // Copy MP4 data to a variable to enable write to S3 Bucket
    let result = mp4create;
    console.log('MP4 Result contents ', result);

    const vidFile = readFileSync('/tmp/beach.mp4');

    // Set S3 bucket details and put MP4 file into S3 bucket from /tmp/
    const s3 = new AWS.S3();
    const params = {
        Bucket: outputBucket,
        Key: 'beach.mp4',
        ACL: 'private',
        Body: vidFile
    };

    // Put MP4 file from AWS Lambda function /tmp/ to an S3 bucket
    const s3Response = await s3.putObject(params).promise();
    callback(null, s3Response);

};


  


• Writing an MPEG video to S3 using the Lambda FFmpeg Layer

  12 avril 2020, par Gracie

  I am using AWS Lambda with the FFmpeg layer to try and convert an existing local MP4 file (beach.mp4) - that is within my upload deployment zip to S3 - into to MPEG video and then write that file to S3.

  



  I have used ffprobe, which works, so the FFmpeg layer is setup correctly.

  



  I am writing a file to S3, but it is blank, only 15 bytes. So doesn't contain the MPEG file created by FFmpeg.

  



  I think this has something to do with sync or streaming the video file so it can be written, but not sure.

  



  Here is my code, if anyone could help figure this out :

  



  const util = require('util');
const AWS = require('aws-sdk');
const s3 = new AWS.S3();
const { readFileSync, writeFileSync, unlinkSync, writeFile, readdir } = require('fs');
//const fs = require('fs');
const path = require('path');
const { spawnSync } = require('child_process');

exports.handler = async (event, context, callback) => {

    const outputBucket = 'mys3bucket';

    const mpegcreate = await spawnSync(
        '/opt/bin/ffmpeg',
        [
            '-i',
            'beach.mp4',
            'beach.mpeg'
        ]
    );

    // Write ffmpeg output to a file in /tmp/
    const writeMPEGFile = util.promisify(writeFile);
    await writeMPEGFile('/tmp/beach.mpeg', mpegcreate, 'binary');
    console.log('MPEG content written to /tmp/');

    // Copy MPEG data to a variable to enable write to S3 Bucket
    let result = mpegcreate;
    console.log('MPEG Result contents ', result);

    const vidFile = readFileSync('/tmp/beach.mpeg');

    // Set S3 bucket details and put MPEG file into S3 bucket from /tmp/
    const s3 = new AWS.S3();
    const params = {
        Bucket: outputBucket,
        Key: 'beach.mpeg',
        ACL: 'private',
        Body: vidFile
    };

    // Put MPEG file from AWS Lambda function /tmp/ to an S3 bucket
    const s3Response = await s3.putObject(params).promise();
    callback(null, s3Response);

};


  


• avcodec/jpeg2000dec : error check when processing tlm marker

  26 mars 2020, par Gautam Ramakrishnan

  avcodec/jpeg2000dec : error check when processing tlm marker
  Validate the value of ST field in the TLM marker of JPEG2000.
  
  Throw an error when ST takes value of 0b11.
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/jpeg2000dec.c