58 lines
1.3 KiB
Go
58 lines
1.3 KiB
Go
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package media
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import (
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"errors"
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"fmt"
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"strconv"
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"codeberg.org/danjones000/strip-beats/config"
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ffmpeg "github.com/u2takey/ffmpeg-go"
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)
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func TrimWithFade(in Probe, out string, start, stop, up, down float64) error {
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// -ss (start) -t (end) -af afade=t=in:st=(start):d=(up),afade=t=out:st=(downstart):d=(down)
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st := in.GetFirstAcceptableAudio()
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if st == nil {
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return errors.New("Can't find an audio stream")
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}
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args := ffmpeg.KwArgs{"c:a": "copy"}
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if start != 0 {
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args["ss"] = start
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}
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if stop != 0 {
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end := stop - start
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args["t"] = end
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} else {
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stop = st.Duration
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}
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input := ffmpeg.Input(in.Format.Path).Get(strconv.Itoa(st.Index))
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if up != 0 {
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args["c:a"] = config.GetConfig().FfEncoder
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input = input.Filter("afade", ffmpeg.Args{
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"t=in",
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fmt.Sprintf("st=%v", start),
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fmt.Sprintf("d=%v", up)})
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}
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if down != 0 {
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args["c:a"] = config.GetConfig().FfEncoder
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downstart := stop - down
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input = input.Filter("afade", ffmpeg.Args{
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"t=out",
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fmt.Sprintf("st=%v", downstart),
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fmt.Sprintf("d=%v", down)})
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}
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output := input.Output(out, args).GlobalArgs("-y")
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// @todo out should be stdout
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return output.Run()
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}
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func Trim(in Probe, out string, start, stop float64) error {
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return TrimWithFade(in, out, start, stop, 0, 0)
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}
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func Fade(in Probe, out string, up, down float64) error {
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return TrimWithFade(in, out, 0, 0, up, down)
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}
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