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

  8 April 2024, by 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?

  


• Revision 0ce2a27e9b: Enable coefficient range checking for 10-/12-bit Also fixes a broken build with

  6 January 2015, by Deb Mukherjee

  Changed Paths:
   Modify /vp9/common/vp9_idct.c

  
   Modify /vp9/common/vp9_idct.h

  
   Modify /vp9/decoder/vp9_detokenize.c

  
  
  Enable coefficient range checking for 10-/12-bit

  Also fixes a broken build with —enable-coefficient-range-checking
  configuration option.

  Change-Id: Icc536f53088e8cec59dfb8f635668555fdb9125e

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

  23 February 2019, by 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