gramps
bd396e488c
Root cause (measured, not guessed): the take-3 'rebase on overrun' reset
nextTick to wall-now, erasing every missed slot. Pump delivered 215-219/300
per 5s (~43fps) but rawvideo carries no timestamps — ffmpeg muxes by frame
count at -framerate 60, so every recording played fast with honest-looking
stats. A second pacer, ffmpeg -re, throttled the demux separately
('Resumed reading ... after a lag' 0.79s->4.82s).
Fix follows libobs video-io.c (https://github.com/obsproject/obs-studio)
- the video thread never resets its deadline; one frame per interval slot,
a late render repeats content (judder), never skips time:
1. FramePump: count-based emission, while(now>=nextTick){Submit; nextTick+=I}
2. FfmpegArgs: -re removed - the pump is the pacer
Muxed duration is now frame-count/fps == wall time by construction. Covers
game background + webcam (one shared pump). 0 warnings; suite 288/289 -
the one failure (Composite_FullScene_MasterPixels 1380,700) also fails with
this change stashed: pre-existing, untouched, recorded as follow-up.
63 lines
2.7 KiB
C#
63 lines
2.7 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 by the frame pump — the pump holds a strict
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/// CFR cadence, so <c>-re</c> would only add a second, fighting pacer), real
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/// 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 args = new List<string>
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{
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"-hide_banner", "-loglevel", "info",
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"-stats", "-stats_period", "0.5",
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"-f", "rawvideo", "-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", "-ar", options.AudioSampleRate.ToString(),
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"-ac", options.AudioChannels.ToString(),
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"-i", $@"\\.\pipe\{options.AudioPipeName}",
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};
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// Each output is a self-contained block: its own -map, codec options,
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// format, and destination. Record+stream encodes the video twice off the
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// one raw input pipe (cheap on NVENC).
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if (options.StreamEnabled)
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{
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AddVideoTags(args, options, videoEncoder);
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args.AddRange(["-c:a", "aac", "-b:a", "128k",
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"-ar", options.AudioSampleRate.ToString(), "-ac", options.AudioChannels.ToString()]);
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args.AddRange(["-f", "flv", options.RtmpUrl]);
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}
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if (options.RecordEnabled)
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{
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AddVideoTags(args, options, videoEncoder);
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args.AddRange(["-c:a", "aac",
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"-ar", options.AudioSampleRate.ToString(), "-ac", options.AudioChannels.ToString()]);
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args.AddRange(["-f", "mp4", options.RecordPath!]);
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}
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return args;
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}
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private static void AddVideoTags(List<string> args, EncoderOptions options, string videoEncoder)
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{
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var gop = options.GopSize;
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args.AddRange(["-map", "0:v", "-map", "1:a"]);
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args.AddRange(["-c:v", videoEncoder]);
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args.AddRange(["-b:v", $"{options.BitrateKbps}k", "-maxrate", $"{options.BitrateKbps}k",
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"-bufsize", $"{options.BitrateKbps * 2}k"]);
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args.AddRange(["-g", gop.ToString(), "-keyint_min", gop.ToString(),
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"-sc_threshold", "0", "-bf", "0", "-pix_fmt", "yuv420p"]);
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}
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}
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