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https://github.com/owncast/owncast.git
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98 lines
3.1 KiB
Go
98 lines
3.1 KiB
Go
package main
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import (
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"fmt"
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"log"
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"os"
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"os/exec"
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"path"
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"strings"
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)
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func startFfmpeg(configuration Config) {
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var outputDir = configuration.PublicHLSPath
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var variantPlaylistPath = configuration.PublicHLSPath
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if configuration.IPFS.Enabled || configuration.S3.Enabled {
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outputDir = configuration.PrivateHLSPath
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variantPlaylistPath = configuration.PrivateHLSPath
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}
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outputDir = path.Join(outputDir, "%v")
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// var masterPlaylistName = path.Join(configuration.PublicHLSPath, "%v", "stream.m3u8")
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var variantPlaylistName = path.Join(variantPlaylistPath, "%v", "stream.m3u8")
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// var variantRootPath = configuration.PublicHLSPath
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// variantRootPath = path.Join(variantRootPath, "%v")
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// variantPlaylistName := path.Join("%v", "stream.m3u8")
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log.Printf("Starting transcoder saving to /%s.", variantPlaylistName)
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pipePath := getTempPipePath()
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var videoMaps = make([]string, 0)
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var streamMaps = make([]string, 0)
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var audioMaps = make([]string, 0)
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for index, quality := range configuration.VideoSettings.StreamQualities {
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videoMaps = append(videoMaps, fmt.Sprintf("-map v:0 -c:v:%d libx264 -b:v:%d %s", index, index, quality.Bitrate))
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streamMaps = append(streamMaps, fmt.Sprintf("v:%d,a:%d", index, index))
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audioMaps = append(audioMaps, "-map a:0")
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}
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ffmpegFlags := []string{
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"-hide_banner",
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"-re",
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"-i pipe:",
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// "-vf scale=900:-2", // Re-enable in the future with a config to togging resizing?
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// "-sws_flags fast_bilinear",
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strings.Join(videoMaps, " "), // All the different video variants
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strings.Join(audioMaps, " ") + " -c:a copy", // Audio for all the variants
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// strings.Join(audioMaps, " ") + " -c:a aac -b:a 192k -ac 2", // Audio for all the variants
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"-master_pl_name stream.m3u8",
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"-g 60", "-keyint_min 60", // create key frame (I-frame) every 48 frames (~2 seconds) - will later affect correct slicing of segments and alignment of renditions
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"-framerate 30",
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"-r 15",
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"-preset " + configuration.VideoSettings.EncoderPreset,
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"-sc_threshold 0", // don't create key frames on scene change - only according to -g
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"-profile:v main", // Main – for standard definition (SD) to 640×480, High – for high definition (HD) to 1920×1080
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"-f hls",
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"-hls_list_size 30",
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"-hls_time 10",
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"-strftime 1",
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"-use_localtime 1",
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"-hls_playlist_type event",
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"-hls_segment_filename " + path.Join(outputDir, "stream-%Y%m%d-%s.ts"),
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"-hls_flags delete_segments+program_date_time+temp_file",
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"-segment_wrap 100",
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"-tune zerolatency",
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// "-master_m3u8_publish_rate 5",
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"-var_stream_map \"" + strings.Join(streamMaps, " ") + "\"",
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variantPlaylistName,
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}
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ffmpegFlagsString := strings.Join(ffmpegFlags, " ")
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ffmpegCmd := "cat " + pipePath + " | " + configuration.FFMpegPath + " " + ffmpegFlagsString
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// fmt.Println(ffmpegCmd)
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_, err := exec.Command("sh", "-c", ffmpegCmd).Output()
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fmt.Println(err)
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verifyError(err)
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}
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func writePlaylist(data string, filePath string) {
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f, err := os.Create(filePath)
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defer f.Close()
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if err != nil {
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fmt.Println(err)
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return
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}
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_, err = f.WriteString(data)
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if err != nil {
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fmt.Println(err)
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return
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}
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}
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