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• How to set the length metadata property with fluent-ffmpeg ?

  8 avril 2024, par volume one

  I have transcoded a sample video using fluent-ffpmeg and want to set the length metadata property so that the <video></video> player knows how long the video is going to be.

  


  To get the duration of the video I did this :

  


  import ffmpeg from 'fluent-ffmpeg';

function ffprobePromise() {
            return new Promise((resolve, reject) => {
                ffmpeg.ffprobe('/path/to/file'), function (err, metadata) {
                    FileDuration = metadata.format.duration;
                    resolve()
                });
            })}

  await ffprobePromise();

  ffmpeg('path/to/output')
                    .videoCodec('libx264')
                    .audioCodec('libmp3lame')
                    .duration(FileDuration)   // !! not setting 'length' metadata property in file
                    .size(`960x400`)
                    // Stream output requires manually specifying output formats
                    .format('mp4')
                    .outputOptions(['-movflags dash', `-metadata length=${FileDuration}`]) // also not setting length in metadata


  


  Here is the sample file that was created : https://devxxx001.s3.amazonaws.com/sample_960x400_47sec.mp4

  


  If you download and view the properties of that file, there is no length property in the metadata. Hence when you play the file, the video player is not able to determine the total duration of the video. You'll notice it keeps jumping up as the video plays.

  


  The ffmpeg documentation states that you can use ffmpeg -i in.avi -metadata title="my title" out.flv to set the title for example. But how do you do this with fluent-ffmpeg ?

  


• avformat:matroskadec : use a define to mark the EBML length is unknown

  23 février 2019, par Steve Lhomme

  avformat:matroskadec : use a define to mark the EBML length is unknown
  Unifying the way the EBML unknown length is signaled, rather than using two
  
  incompatible values. UINT64_MAX cannot be read as a valid EBML length with the
  
  current code.
  Co-authored-by : Steve Lhomme <robux4@ycbcr.xyz>
  
  Co-authored-by : Dale Curtis <dalecurtis@chromium.org>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/matroskadec.c

• audio dynamic range compression in php

  28 mai 2020, par monu214

  Is this possible to dynamic audio range compression in PHP. There is a lot of confusion between compression of audio, what I mean of audio compression here is described in this article.

  



  Some posts I saw here about the audio compression which only converts the audio format from wav to mp3 or other formats using FFmpeg, but what I want here is to change some audio settings like threshold, compression ratio, attack time, release time which is basic settings that can be used in audio compression.

  



  Is there any way I can do this in server-side using PHP ?