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More tuning

monorepo
Varun Patil 2022-11-12 10:51:31 -08:00
parent af6c0eb190
commit 8fc89b853c
1 changed files with 28 additions and 9 deletions
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37
manager.go
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@ -39,6 +39,7 @@ type ProbeVideoData struct {
Duration time.Duration
FrameRate int
CodecName string
BitRate int
}
func NewManager(c *Config, path string, id string, close chan string) (*Manager, error) {
@ -58,33 +59,43 @@ func NewManager(c *Config, path string, id string, close chan string) (*Manager,
return nil, err
}
// heuristic
if m.probe.CodecName != "h264" {
m.probe.BitRate *= 2
}
m.numChunks = int(math.Ceil(m.probe.Duration.Seconds() / float64(c.chunkSize)))
// Possible streams
m.streams["360p"] = &Stream{c: c, m: m, quality: "360p", height: 360, width: 640, bitrate: 500000}
m.streams["480p"] = &Stream{c: c, m: m, quality: "480p", height: 480, width: 640, bitrate: 1200000}
m.streams["720p"] = &Stream{c: c, m: m, quality: "720p", height: 720, width: 1280, bitrate: 2500000}
m.streams["1080p"] = &Stream{c: c, m: m, quality: "1080p", height: 1080, width: 1920, bitrate: 3500000}
m.streams["720p"] = &Stream{c: c, m: m, quality: "720p", height: 720, width: 1280, bitrate: 2200000}
m.streams["1080p"] = &Stream{c: c, m: m, quality: "1080p", height: 1080, width: 1920, bitrate: 3600000}
m.streams["1440p"] = &Stream{c: c, m: m, quality: "1440p", height: 1440, width: 2560, bitrate: 6000000}
m.streams["2160p"] = &Stream{c: c, m: m, quality: "2160p", height: 2160, width: 3840, bitrate: 10000000}
// Only keep streams that are smaller than the video
var highest int
for k, stream := range m.streams {
// scale bitrate by frame rate with reference 30
stream.bitrate = int(float64(stream.bitrate) * float64(m.probe.FrameRate) / 30.0)
if stream.height >= m.probe.Height || stream.width >= m.probe.Width {
if stream.height > m.probe.Height || stream.width > m.probe.Width {
delete(m.streams, k)
} else if stream.bitrate > highest {
highest = stream.bitrate
}
if stream.height == m.probe.Height || stream.width == m.probe.Width {
if stream.bitrate > m.probe.BitRate || float64(stream.bitrate) > float64(m.probe.BitRate)*0.8 {
// no point in "upscaling"
// should have at least 20% difference
delete(m.streams, k)
}
}
}
// Original stream
m.streams["max"] = &Stream{
c: c, m: m, quality: "max", height: m.probe.Height, width: m.probe.Width,
bitrate: int(float64(highest) * 1.5),
bitrate: m.probe.BitRate,
}
// Start all streams
@ -198,7 +209,7 @@ func (m *Manager) ServeIndex(w http.ResponseWriter) error {
// Write all streams
for _, stream := range streams {
s := fmt.Sprintf("#EXT-X-STREAM-INF:BANDWIDTH=%d,RESOLUTION=%dx%d,NAME=\"%s\"\n%s.m3u8\n", stream.bitrate, stream.width, stream.height, stream.quality, stream.quality)
s := fmt.Sprintf("#EXT-X-STREAM-INF:BANDWIDTH=%d,RESOLUTION=%dx%d,FRAME-RATE=%d\n%s.m3u8\n", stream.bitrate, stream.width, stream.height, m.probe.FrameRate, stream.quality)
w.Write([]byte(s))
}
return nil
@ -215,7 +226,7 @@ func (m *Manager) ffprobe() error {
// video
"-show_entries", "format=duration",
"-show_entries", "stream=duration,width,height,avg_frame_rate,codec_name",
"-show_entries", "stream=duration,width,height,avg_frame_rate,codec_name,bit_rate",
"-select_streams", "v", // Video stream only, we're not interested in audio
"-of", "json",
@ -242,6 +253,7 @@ func (m *Manager) ffprobe() error {
Duration string `json:"duration"`
FrameRate string `json:"avg_frame_rate"`
CodecName string `json:"codec_name"`
BitRate string `json:"bit_rate"`
} `json:"streams"`
Format struct {
Duration string `json:"duration"`
@ -283,12 +295,19 @@ func (m *Manager) ffprobe() error {
}
frameRate := float64(num) / float64(den)
// BitRate is a string
bitRate, err := strconv.Atoi(out.Streams[0].BitRate)
if err != nil {
bitRate = 5000000
}
m.probe = &ProbeVideoData{
Width: out.Streams[0].Width,
Height: out.Streams[0].Height,
Duration: duration,
FrameRate: int(frameRate),
CodecName: out.Streams[0].CodecName,
BitRate: bitRate,
}
return nil