52 lines
1.9 KiB
C#
52 lines
1.9 KiB
C#
namespace ytLive.Services.Encoder;
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/// <summary>
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/// Builds the FFmpeg command line for a live RTMP push (TASK 4 ship step 3):
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/// raw BGRA frames via stdin (paced <c>-re</c>), real audio via the named pipe
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/// (TASK 9 — the mixer streams f32le at 48 kHz stereo into <c>\\.\pipe\<name></c>;
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/// WASAPI loopback + the mic ride the pipe instead of the old anullsrc silence),
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/// H.264 + AAC encoding, FLV muxing to the ingestion URL. Pure — the encoder
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/// just starts <c>ffmpeg.exe [Build(...)]</c>.
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/// </summary>
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public static class FfmpegArgs
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{
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public static IReadOnlyList<string> Build(EncoderOptions options, string videoEncoder)
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{
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var gop = options.GopSize;
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return
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[
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"-hide_banner",
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"-loglevel", "info",
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"-stats",
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"-stats_period", "0.5",
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"-re",
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"-f", "rawvideo",
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"-pix_fmt", "bgra",
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"-video_size", $"{options.Width}x{options.Height}",
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"-framerate", options.Fps.ToString(),
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"-i", "pipe:0",
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"-f", "f32le",
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"-ar", options.AudioSampleRate.ToString(),
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"-ac", options.AudioChannels.ToString(),
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"-i", $@"\\.\pipe\{options.AudioPipeName}",
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"-map", "0:v",
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"-map", "1:a",
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"-c:v", videoEncoder,
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"-b:v", $"{options.BitrateKbps}k",
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"-maxrate", $"{options.BitrateKbps}k",
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"-bufsize", $"{options.BitrateKbps * 2}k",
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"-g", gop.ToString(),
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"-keyint_min", gop.ToString(),
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"-sc_threshold", "0",
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"-bf", "0",
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"-pix_fmt", "yuv420p",
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"-c:a", "aac",
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"-b:a", "128k",
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"-ar", options.AudioSampleRate.ToString(),
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"-ac", options.AudioChannels.ToString(),
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"-f", "flv",
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options.RtmpUrl,
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];
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}
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}
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