Using flutter how to merge audio file with sync of any video like camera action like that there is any specific package is available in flutter

Question

I have been searching for the packages or any method for the particular problem, i googled but i didn't find any solution , So my issue is , i want functionality like ticktock App , user can select any music audio and they can play according to that user can do action, with sync of both audio and video i want output file as video. how can i achieve this , is there any method or any packages are avalibale in flutter . i have done selecting audio and video recording feature but i ma stuck with the merging both , if FFmpeg package we can use means , how to use that packages .. please explain me guys.

Solution

In FFmpeg You can do it by playing the audio, recording video and then merging two files like

final FlutterFFmpeg _ffMpeg = FlutterFFmpeg();

_ffMpeg.execute("-i video.mp4 -i audio.mp4 -c copy output.mp4")
              .then((return_code) => print("Return code $return_code"));

With FFmpeg You need to find the command that suits You the best.

But... Personally I think FFmpeg isn't a good choice:

1. It is heavy
2. You can't use it in commercial projects (I might be wrong, please correct me if I am)

What I suggest

You can record video and have audio file and video with Flutter. Then use platform specific code.

Even if you don't have experience in specific language I found those two libraries that could help:

iOS: https://github.com/dev-labs-bg/swift-video-generator (does exactly what You need).

Android: https://github.com/israel-fl/bitmap2video (I'm not sure if works with videos, but it accepts bitmaps)