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• How check the file is corrupted before concatenate them with FFmpeg ?

  17 février 2021, par Ali Esmailpor

  I'm using child_process package in NodeJS to run FFmpeg for concatenating some videos. The command that I use for concatenating is :

  


  ffmpeg -f concat -i list_file.txt -c copy final.mp4


  


  that list_file.txt is the list of videos file and it contains :

  


  file '700010023590099933_1612945401707.mp4'
file '700010023590099933_1612945439023.mp4'
.
.


  


  I want to check every video before concatenate them because if one of them be corrupted it stops the process and throws an error. So it makes the final video corrupted too.

  


  In addition, I can check if a video file is OK or not with this command :

  


  ffmpeg -i input.mp4 -c copy -f null -; echo $?


  


  that returns 0 if file is OK and 1 if not.

  


  I want to check all the video files and if all of them are OK then concatenate them. And if each one was corrupted then exclude it and continue the process.
Is there a way to do this in one command ?

  


• How to set specific minimal bitrate of video with light_compressor package in Flutter ?

  21 juin 2023, par Giant Brain

  I tried using flutter's light_compressor package to compress a video I shot with my phone or downloaded from YouTube.

  


  I refer to the article below.
https://morioh.com/p/ac6f0d2c176b
In this article, the minimum bit rate can be set and the default value is 2mbps.

  


  However, in the sample code, only the flag isMinBitrateCheckEnabled exists, and there is no parameter to set a specific bit rate.

  


  How do I compress the video to my desired bitrate ?

  


  Below is a part of the sample code.

  


  import 'package:light_compressor/light_compressor.dart';


final LightCompressor _lightCompressor = LightCompressor();
final dynamic response = await _lightCompressor.compressVideo(
  path: _sourcePath,
  destinationPath: _destinationPath,
  videoQuality: VideoQuality.medium,
  isMinBitrateCheckEnabled: false,
  frameRate: 24 /* or ignore it */);


  


• What is the easiest way to merge GIF and Audio files into one Video file using FFMPEG

  7 avril 2021, par Mouaad Abdelghafour AITALI

  I have an audio file and GIF, I would like to merge both of them into one video file, I've done the following :

  


  Converting GIF into Video

  


  Looping the output video X time X = (int) (audioDuration / 1000.0) / gifDuration;

  


  Merge the final video with the audio

  


  FFmpeg commands :

  


  Converting GIF into Video

  


  -f gif -y -i input.gif -c:a copy -c:v libx265 -crf 26 -preset ultrafast -s 1080*1920 -pix_fmt yuv420p -map 0 gif2video.mp4


  


  Looping the output video X time

  


  -y -stream_loop " + X + " -i gif2video.mp4 -c copy looped_output.mp4


  


  Merge the final video with the audio :

  


  -y -i looped_output.mp4 -i audio.mp3 -c:v copy -c:a aac final_output.mp4


  


  The above command works, but sometimes the output video export with one GIF frame (no animation) and audio