Recherche avancée

Sur d’autres sites (5591)

• Standardizing many mp4 files into same resolution

  22 novembre 2018, par Cowfod

  I have a huge collection of Instagram videos in different resolutions and with different audio codecs.

  Some videos are 640x640, others are 640x800. You get the picture.

  When I try to concat the videos, the video and audio go out of sync in the final output and the in some places the audio is slowed down(?).

  This is my ffmpeg concat command :

  ffmpeg -i "$(cat /home/list.txt)" -c:v copy -c:a copy /home/output.mp4

  list.txt contains over 800 clips and is formatted correctly :

  file 'clip1.mp4'
  
  file 'clip2.mp4'
  
  file 'clip3.mp4'
  
  etc...

  I believe the issue is due to all the different resolutions and different codecs used, so how can I standardize my collection of clips in order to concat them into a working video file ?

• How to convert a video to greyscale with a particular tint in ffmpeg with colorchannelmixer ?

  19 août 2023, par Mich_Lloid

  In the manual of ffmpeg https://ffmpeg.org/ffmpeg-filters.html#colorchannelmixer
with colorchannelmixer there are examples for greyscale
  
ffmpeg -i input.mp4 -vf colorchannelmixer=.3:.4:.3:0:.3:.4:.3:0:.3:.4:.3 -pix_fmt yuv420p output.mp4
  
and sepia
  ffmpeg -i input.mp4 -vf colorchannelmixer=.393:.769:.189:0:.349:.686:.168:0:.272:.534:.131 -pix_fmt yuv420p output.mp4
  
How do I convert a video to greyscale with another particular tint for example purplish color violet rgb(238,130,238), blueish color indigo rgb(75,0,130) or yellowish khaki rgb(240,230,140) ?
  
There's a detailed explanation about how colorchannelmixer works at
https://superuser.com/questions/1330300/need-a-detail-explanation-for-ffmpeg-colorchannelmixer.
  This is specifically about a colorchannelmixer formula on how to input the 9 important parameters rr:rg:rb gr:gg:gb br:bg:bb to get the desired colors/tints using math, not the colorize filter solution at ffmpeg : how to put only color overlay video or apply different type of color filter like instagram in video using ffmpeg.

  


• Error : ffmpeg exited with code 1 on AWS Lambda

  16 juin 2022, par Hassnain Alvi

  I am using fluent-ffmpeg nodejs package to run ffmpeg for audio conversion on AWS Lambda. I am using this FFmpeg layer for lambda.
Here is my code

  


    const bitrate64 = ffmpeg("file.mp3").audioBitrate('64k');
    bitrate64.outputOptions([
        '-preset slow',
    '-g 48',
    "-map", "0:0",
        '-hls_time 6',
        '-master_pl_name master.m3u8',
        '-hls_segment_filename 64k/fileSequence%d.ts'
    ])
    .output('./64k/prog_index.m3u8')
    .on('progress', function(progress) {
        console.log('Processing 64k bitrate: ' + progress.percent + '% done')
    })  
    .on('end', function(err, stdout, stderr) {
        console.log('Finished processing 64k bitrate!')
    })
    .run() 


  


  after running it via AWS lambda I get following error message

  


  ERROR   Uncaught Exception  &#xA;{&#xA;    "errorType": "Error",&#xA;    "errorMessage": "ffmpeg exited with code 1: Conversion failed!\n",&#xA;    "stack": [&#xA;        "Error: ffmpeg exited with code 1: Conversion failed!",&#xA;        "",&#xA;        "    at ChildProcess.<anonymous> (/var/task/node_modules/fluent-ffmpeg/lib/processor.js:182:22)",&#xA;        "    at ChildProcess.emit (events.js:198:13)",&#xA;        "    at ChildProcess.EventEmitter.emit (domain.js:448:20)",&#xA;        "    at Process.ChildProcess._handle.onexit (internal/child_process.js:248:12)"&#xA;    ]&#xA;}&#xA;</anonymous>

  


  I don't get any more info so I am not sure what's going on. Can anyone tell me what's wrong here and how can I enable more detailed logs ?