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I want the same effect as this command line, but I don't know how to make it
ffmpeg -i 1.video -i 1.audio -vcodec copy -acodec copy output.mp4 let video_file = "1.video".to_owned();
let audio_file = "1.audio".to_owned();
let mix_file = "1.mp4".to_owned();
let mut video_input = ffmpeg::format::input(&video_file).unwrap();
let mut audio_input = ffmpeg::format::input(&audio_file).unwrap();
let mut mix_output = ffmpeg::format::output(&mix_file).unwrap();
video_input
.streams()
.best(ffmpeg::media::Type::Video)
.map(|stream| {
// ????
});
let best_audio_stream_index = audio_input
.streams()
.best(ffmpeg::media::Type::Audio)
.map(|stream| stream.index());
mix_output.set_metadata()
mix_output.........Metadata
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