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109 lines
3.6 KiB
109 lines
3.6 KiB
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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"strconv" |
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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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var videoMapsString = "" |
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var audioMapsString = "" |
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var streamMappingString = "" |
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if configuration.VideoSettings.EnablePassthrough || len(configuration.VideoSettings.StreamQualities) == 0 { |
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fmt.Println("Enabling passthrough video") |
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// videoMaps = append(videoMaps, fmt.Sprintf("-map 0:v -c:v copy")) |
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streamMaps = append(streamMaps, fmt.Sprintf("v:%d,a:%d", 0, 0)) |
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} else { |
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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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videoMapsString = strings.Join(videoMaps, " ") |
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audioMaps = append(audioMaps, "-map a:0") |
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audioMapsString = strings.Join(audioMaps, " ") + " -c:a copy" // Pass through audio for all the variants, don't reencode |
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} |
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} |
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streamMappingString = "-var_stream_map \"" + strings.Join(streamMaps, " ") + "\"" |
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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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videoMapsString, // All the different video variants |
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audioMapsString, |
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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 " + strconv.Itoa(configuration.Files.MaxNumberInPlaylist), |
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"-hls_time " + strconv.Itoa(configuration.VideoSettings.ChunkLengthInSeconds), |
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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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"-tune zerolatency", |
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streamMappingString, |
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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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