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examples/transcode-audio: extend example with seek ability

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lummax 2015-10-14 16:23:16 +02:00 committed by meh
parent ac0ef697cf
commit c471ab9df8
1 changed files with 11 additions and 0 deletions
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examples/transcode-audio.rs
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@ -90,17 +90,28 @@ fn transcoder<P: AsRef<Path>>(ictx: &mut format::context::Input, octx: &mut form
//
// Example 2: Overlay an audio file
// transcode-audio in.mp3 out.mp3 "amovie=overlay.mp3 [ov]; [in][ov] amerge [out]"
//
// Example 3: Seek to a specified position (in seconds)
// transcode-audio in.mp3 out.mp3 anull 30
fn main() {
ffmpeg::init().unwrap();
let input = env::args().nth(1).expect("missing input");
let output = env::args().nth(2).expect("missing output");
let filter = env::args().nth(3).unwrap_or("anull".to_owned());
let seek = env::args().nth(4).and_then(|s| s.parse::<i64>().ok());
let mut ictx = format::input(&input).unwrap();
let mut octx = format::output(&output).unwrap();
let mut transcoder = transcoder(&mut ictx, &mut octx, &output, &filter).unwrap();
if let Some(position) = seek {
// If this seek was embedded in the transcoding loop, a call of `flush()`
// for every opened buffer after the successful seek would be advisable.
let position = position * ffmpeg::ffi::AV_TIME_BASE;
ictx.seek(position, ..position).unwrap();
}
octx.set_metadata(ictx.metadata().to_owned());
octx.write_header().unwrap();