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53 lines
1.8 KiB
Go
53 lines
1.8 KiB
Go
package src
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import (
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"fmt"
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"log"
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)
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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 {
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log.Printf("Creating a new video stream for %s in quality %s", file.Path, quality)
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ret := new(VideoStream)
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ret.quality = quality
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ret.Stream = NewStream(file, ret)
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return ret
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}
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func (vs *VideoStream) getFlags() Flags {
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return VideoF
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}
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func (vs *VideoStream) getOutPath(encoder_id int) string {
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return fmt.Sprintf("%s/segment-%s-%d-%%d.ts", vs.file.Out, vs.quality, encoder_id)
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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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// sc_threshold is a scene detection mechanisum used to create a keyframe when the scene changes
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// this is on by default and inserts keyframes where we don't want to (it also breaks force_key_frames)
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// we disable it to prevents whole scenes from behing removed due to the -f segment failing to find the corresonding keyframe
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"-sc_threshold", "0",
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"-strict", "-2",
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}
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}
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