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• How to play video Media Source Extensions when the audio start is delayed ? Or how to fix it with ffmpeg ?

  11 décembre 2020, par sheodox

  I have a video that I'm splitting the individual video/audio streams out then dashing with MP4Box, then I'm playing them with Media Source Extensions and appending byte ranges to video/audio source buffers from the MPD files. It's all working nicely, but one video I have has audio that is delayed by about 1.1 second. I couldn't get it to sync up and the audio would always play ahead of the video.

  


  Currently I'm trying to set the audioBuffer.timestampOffset = 1.1 and that gets it to sync up perfectly. The issue I'm running into now though is the video refuses to play unless the audio source buffer has data. So the video stalls right away. If I skip a few seconds in (past the offset) everything works because both video/audio are buffered.

  


  Is there a way to get around this ? Either make it play without the audio loaded, somehow fill the audio buffer with silence (can I generate something with the Web Audio API) ? Add silence to the audio file in ffmpeg ? Something else ?

  


  I first tried adding a delay in ffmpeg with ffmpeg -i video.mkv -map 0:a:0 -acodec aac -af "adelay=1.1s:all=true" out.aac but nothing seemed to change. Was I doing something wrong ? Is there a better way to demux audio while keeping the exact same timing as when it was in the container with the video so I don't have to worry about delays/offsets at all ?

  


• combine raw video and audio buffer and play using named pipes by ffplay

  28 juillet 2023, par user8616480

  I have one video buffer and one audio buffer, I want to combine these buffers and play using ffplay as a combined entity, currently I am using this command , which obliviously doesn't work...

  


  ffplay -f rawvideo -pixel_format bgr24 -video_size 1280x720 -vf "transpose=2,transpose=2" -i \.\pipe\VirtualVideoPipe -f s32le -channels 2 -sample_rate 44100 -i \.\pipe\VirtualAudioPipe


  


  error massage says ...

  


  Argument '\.\pipe\VirtualAudioPipe' provided as input filename, but '\.\pipe\VirtualVideoPipe' was already specified.


  


  what should be the command for combining two named pipe video and audio sources and play as one.

  


  kindly help ...

  


• MP4 made in FFMPEG cannot play / be opened

  29 juin 2021, par Anters Bear

  I am trying to make a video by combining a sequence of PNG images. It seems to be working fine except, the outputted MP4 cannot actually be opened / play with Quicktime. So basically it's not working. I can't figure out what the issue is or how to even go about debugging this because I don't get an error or anything. Below is my code :

  


  var ffmpegPath = require('@ffmpeg-installer/ffmpeg').path;
var ffmpeg = require('fluent-ffmpeg');
ffmpeg.setFfmpegPath(ffmpegPath);
var command = ffmpeg();

command
    .size('2000x2000')
    .input('Aussie1_Export/test_%04d.png')
    .inputFPS(1)
    .output('Aussie_Export_Video/test.mp4')
    .outputFPS(30)
    .noAudio()
    .on('error', (error) => { console.log('error'); })
    .run();