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• FireFox Video throws warning but video actually works ?

  21 février 2021, par SdBill
  

  • OS : Ubuntu 18.04

  


  • FF : 85.0.1

  


  • Error/warning : Cannot play media. No decoders for requested formats : video/mp4, video/mp4

  


  


  Same error for video/ogg

  


  Here are my questions : 1) The video still plays fine once loaded, and there is no error in Chrome or Chromium. Why does the video work fine after loading but throws the error on load ? 2) Is there anything that can be done without re-encoding over 2 gigs of video ?

  


  Context : this is an old no-profit site that used Flash for video and we really don't want to throw a lot of time at, but there are gigs of videos. I converted all .flv files and .mpg files to .mp4 using the most simple of ffmpeg commands, examples :

  


  ffmpeg -i video-source.flv video-source.mp4
ffmpeg -i video-source.mpg video-source.mp4
ffmpeg -i video-source.mpg video-source.ogg


  


  As I watched the ffmpeg output, it looked to me like the codec was H264 (at least, I think that is what I am seeing, not a video expert.)

  


  Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> theora (libtheora))
  Stream #0:1 -> #0:1 (aac (native) -> vorbis (libvorbis))


  


  Server response in a direct request to the mp4 files is

  


  Content-Type
    video/mp4


  


  I have seen the documentation and posts on fragmented mp4 and if re-encoding is the only option, we're probably going to abandon as it does play once loaded.

  


  Code is simplistic, using an html5 doctype :

  


    <video width="320" height="240" controls="controls">&#xA;   <source src="/images/video/mp4/video-source.mp4" type="video/mp4">&#xA;   <source src="/images/video/ogg/video-source.ogg" type="video/ogg">&#xA;   Your browser does not support the video tag.&#xA;  </source></source></video>&#xA;

  


  Is the only option here to pander to FireFox and re-encode everything since as mentioned, it plays fine once loaded and throws no error in Chrome ?

  


• fluent-ffmpeg unable to achieve consistent audio bitrate

  20 septembre 2020, par Martin

  I am working on an electron app that runs ffmpeg commands to combine an audio file + image file into a video file. I'm using an fluent-ffmpeg command I wrote, which works, but the outputted video fiels always have a lower audio bit rate, even though I specify 320kbps in my command.

  


  I've been running multiple tests with mp3/flac/wav files that I logged below ; using my fluent-ffmpeg command as follows :

  


  ffmpeg()
            .input(imgPath)
            .loop()
            .addInputOption('-framerate 2')
            .input(audioPath)
            .videoCodec('libx264')
            .audioCodec('aac')
            //.audioCodec('copy')
            .audioBitrate('320k')
            .videoBitrate('8000k', true)
            .size('1920x1080')
            .outputOptions([
                '-preset medium',
                '-tune stillimage',
                '-crf 18',
                '-b:a 320k',
                '-pix_fmt yuv420p',
                '-shortest'
            ])

            .on('progress', function (progress) {
                document.getElementById(updateInfoLocation).innerText = `Generating Video: ${Math.round(progress.percent)}%`
                console.info(`vid() Processing : ${progress.percent} % done`);
            })
            .on('codecData', function (data) {
                console.log('vid() codecData=', data);
            })
            .on('end', function () {
                document.getElementById(updateInfoLocation).innerText = `Video generated.`
                console.log('vid()  file has been converted succesfully; resolve() promise');
                resolve();
            })
            .on('error', function (err) {
                document.getElementById(updateInfoLocation).innerText = `Error generating video.`
                console.log('vid() an error happened: ' + err.message, ', reject()');
                reject(err);
            })
            .output(vidOutput).run()


  


  1) 320bkps mp3 file

  


  

  • imgPath = C :\Users\marti\Documents\projects\mp3 audio\img.jpg

  


  • audioPath = C :\Users\marti\Documents\projects\mp3 audio\08. Strange - Gigi D'Agostino.mp3

  


  • vidOutput = C :\Users\marti\Documents\projects\mp3 audio\08. Strange - Gigi D'Agostino.mp4

  


  


  My audio file has a bit rate of 320kbps :


  


  If I use my above ffmpeg function with .audioCodec('aac'), the output video file has an audio bitrate of 300kbps. If I use .audioCodec('copy') instead, my output video file has an audio bitrate of 317kbps.

  


  2) 1411kbps wav file

  


  

  • audioPath = C :\Users\marti\Documents\projects\wav audio\01 Nem Kaldi.wav

  


  • imgPath = C :\Users\marti\Documents\projects\wav audio\cover.jpg

  


  • vidOutput = C :\Users\marti\Documents\projects\wav audio\01 Nem Kaldi.mp4

  


  


  My wav file has an audio bit rate of 1411kbps ; 
When I run my ffmpeg command using .audioCodec('aac'), my output video file is again only 303kbps


  


  3) 937kbps flac file

  


  

  • audioPath = C :\Users\marti\Documents\projects\flac audio\02 - ryokika.flac

  


  • imgPath = C :\Users\marti\Documents\projects\flac audio\R-1042328-1388635895-5022.jpeg.jpg

  


  • vidOutput = C :\Users\marti\Documents\projects\flac audio\02 - ryokika.mp4

  


  


  When I run my ffmpeg command with.audioCodec('aac'), the outputted video file is only 304kbps

  


  is there any command or additional flag I need to add to ensure my output video files have a high quality audio bitrate ?

  


• Batch converting multiple video formats in nested directories

  1er octobre 2020, par Dave Coffin

  I'm running Arch/Gnome and am trying to convert a few hundred gigs of family videos from various formats (mov, wmv, mkv, avi mainly, but a few curveballs too) into trusty mp4s.

  


  My scripting knowledge is strictly amateur, so far I have ;

  


  for i in *.avi; do ffmpeg -i "$i" "${i%.*}.mp4"; done

  


  That works fine for one directory. There are hundreds. I'd like to replace that one-liner with something more encompassing that I can just run and go to bed.

  


  Wish list ;

  


  


  • run recursively

    


  


  • convert from mov, wmv, mkv and avi without having to run separate scripts

    


  


  • delete old file upon successful completion

    


  


  • keep the same file name

    


  


  • if it finds an error, just skip the file and keep going - don't stop the process

    


  


  


  Any help with any and/or all of these bits to cobble something together that'll work would be most appreciated.