void Start()
{
_workingDirectory = Android.OS.Environment.ExternalStorageDirectory.AbsolutePath;
var sourceMp4 = "cat1.mp4";
var destinationPathAndFilename = System.IO.Path.Combine(_workingDirectory, "cat1_out.mp4");
var destinationPathAndFilename2 = System.IO.Path.Combine(_workingDirectory, "cat1_out2.mp4");
var destinationPathAndFilename4 = System.IO.Path.Combine(_workingDirectory, "cat1_out4.wav");
if (File.Exists(destinationPathAndFilename))
{
File.Delete(destinationPathAndFilename);
}
CreateSampleFile(Resource.Raw.cat1, _workingDirectory, sourceMp4);
var ffmpeg = new FFMpeg(this, _workingDirectory);
var sourceClip = new Clip(System.IO.Path.Combine(_workingDirectory, sourceMp4));
var result = ffmpeg.GetInfo(sourceClip);
var br = System.Environment.NewLine;
// There are callbacks based on Standard Output and Standard Error when ffmpeg binary is running as a process:
var onComplete = new MyCommand((_) => {
RunOnUiThread(() => _logView.Append("DONE!" + br + br));
});
var onMessage = new MyCommand((message) => {
RunOnUiThread(() => _logView.Append(message + br + br));
});
var callbacks = new FFMpegCallbacks(onComplete, onMessage);
// 1. The idea of this first test is to show that video editing is possible via FFmpeg:
// It results in a 150x150 movie that eventually zooms on a cat ear. This is desaturated, and there's a fade in.
var filters = new List <VideoFilter> ();
filters.Add(new FadeVideoFilter("in", 0, 100));
filters.Add(new CropVideoFilter("150", "150", "0", "0"));
filters.Add(new ColorVideoFilter(1.0m, 1.0m, 0.0m, 0.5m, 1.0m, 1.0m, 1.0m, 1.0m));
var outputClip = new Clip(destinationPathAndFilename)
{
videoFilter = VideoFilter.Build(filters)
};
outputClip.H264_CRF = "18"; // It's the quality coefficient for H264 - Default is 28. I think 18 is pretty good.
ffmpeg.ProcessVideo(sourceClip, outputClip, true, new FFMpegCallbacks(onComplete, onMessage));
//2. This is a similar version version in command line only:
string[] cmds = new string[] {
"-y",
"-i",
sourceClip.path,
"-strict",
"-2",
"-vf",
"mp=eq2=1:1.68:0.3:1.25:1:0.96:1",
destinationPathAndFilename2,
"-acodec",
"copy",
};
ffmpeg.Execute(cmds, callbacks);
// 3. This lists codecs:
string[] cmds3 = new string[] {
"-codecs",
};
ffmpeg.Execute(cmds, callbacks);
// 4. This convers to WAV
// Note that the cat movie just has some silent house noise.
ffmpeg.ConvertToWaveAudio(sourceClip, destinationPathAndFilename4, 44100, 2, callbacks, true);
// Etc...
// Rules of thumb:
// a) Provide the minimum of info to ffmpeg to not mix it up
// b) These helpers are cool to test capabilities, but useless otherwise, and crashy: Use command lines.
// c) Try to compile a newer FFmpeg :)
}
