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47 lines
1.4 KiB
Go
47 lines
1.4 KiB
Go
package src
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import "fmt"
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type VideoStream struct {
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Stream
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quality Quality
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}
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func NewVideoStream(file *FileStream, quality Quality) (*VideoStream, error) {
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ret := VideoStream{
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Stream: Stream{
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file: file,
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Clients: make([]string, 4),
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segments: make([]bool, len(file.Keyframes)),
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},
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quality: quality,
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}
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ret.run(0)
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return &ret, nil
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}
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func (vs *VideoStream) getOutPath() string {
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return fmt.Sprintf("%s/segment-%s-%%03d.ts", vs.file.Out, vs.quality)
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}
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func (vs *VideoStream) getTranscodeArgs(segments string) []string {
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if vs.quality == Original {
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return []string{"-map", "0:V:0", "-c:v", "copy"}
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}
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return []string{
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// superfast or ultrafast would produce a file extremly big so we prever veryfast or faster.
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"-map", "0:V:0", "-c:v", "libx264", "-crf", "21", "-preset", "faster",
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// resize but keep aspect ratio (also force a width that is a multiple of two else some apps behave badly.
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"-vf", fmt.Sprintf("scale=-2:'min(%d,ih)'", vs.quality.Height()),
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// Even less sure but bufsize are 5x the avergae bitrate since the average bitrate is only
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// useful for hls segments.
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"-bufsize", fmt.Sprint(vs.quality.MaxBitrate() * 5),
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"-b:v", fmt.Sprint(vs.quality.AverageBitrate()),
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"-maxrate", fmt.Sprint(vs.quality.MaxBitrate()),
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// Force segments to be split exactly on keyframes (only works when transcoding)
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"-force_key_frames", segments,
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"-strict", "-2",
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}
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}
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