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• 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 */);


  


• Burning text to video in Android

  17 juillet 2014, par SebastianG

  I want to "burn" some GPS coordinates on a video file in Android programatically on the device, without using other apps (similar to the picture below, but with coordinates instead)

  

  I have done some research, and the only solution for Android seems to use FFmpeg. I have figured out two approaches :

  1. Adding the coordinates in the form of subtitles. Drawback : as far as I’ve figured out, you can not place the subtitles wherever you want in the video frame
  2. Drawing text using "drawtext". Drawback : it seems to me that this puts a static text on all frames of the video, although I need to put dynamic text on it (GPS coordinates)

  ffmpeg -i i.mp4 -vcodec libx264 -f mp4
  -vf drawtext="fontfile=/[...]/share/fonts/freefont-ttf/FreeSans.ttf
  :text=’....

  So my questions are : are there any other approaches to doing this ? They do not have to use FFmpeg, but the encoding must be done on the device. Am I mistaken in my approaches ?

• Unable to run a program in PATH from Java code

  17 novembre 2012, par user1831004

  I am developing a Red5 media server application on a Mac (Dynamic Web Project in Eclipse). The app has to invoke FFMPEG to convert the video to a different format.

  I added "/Applications/FFMPEG" to PATH variable by running the following command in Terminal :

  echo 'export PATH=/Applications/FFMPEG:$PATH' >> ~/.profile

  When I invoke FFMPEG from terminal, it works fine. However, every time I run it from Java code with :

  Process p = Runtime.getRuntime().exec("ffmpeg");
  
  p.waitFor();

  I get the following error :

  Cannot run program "ffmpeg": error=2, No such file or directory

  I thought this might be a security limitation specific to the type of project, but even a simple Java program produces the same result. What am I missing ?

  ---

  Changing "ffmpeg" to full path of the application works, but I don't want to upload FFMPEG into the same directory as Red5 on a production server.