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Oct 10, 2025
Merged

Dynamic adaptive hls transcoder config #95

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60 changes: 31 additions & 29 deletions docs/tutorials/adaptive-hls.md
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Original file line number Diff line number Diff line change
Expand Up @@ -37,35 +37,37 @@ var outputDirectory = Path.Combine(Directory.GetCurrentDirectory(), "output");
using var liveStreamingServer = LiveStreamingServerBuilder.Create()
.ConfigureRtmpServer(options => options
.AddStreamProcessor()
.AddAdaptiveHlsTranscoder(config =>
{
config.FFmpegPath = ExecutableFinder.FindExecutableFromPATH("ffmpeg")!;
config.FFprobePath = ExecutableFinder.FindExecutableFromPATH("ffprobe")!;
config.OutputPathResolver = new HlsOutputPathResolver(outputDirectory);

config.DownsamplingFilters = new DownsamplingFilter[]{
new DownsamplingFilter(
Name: "360p",
Height: 360,
MaxVideoBitrate: "600k",
MaxAudioBitrate: "64k"
),

new DownsamplingFilter(
Name: "480p",
Height: 480,
MaxVideoBitrate: "1500k",
MaxAudioBitrate: "128k"
),

new DownsamplingFilter(
Name: "720p",
Height: 720,
MaxVideoBitrate: "3000k",
MaxAudioBitrate: "256k"
)
};
})
.AddAdaptiveHlsTranscoder(configure =>
configure.ConfigureDefault(config =>
{
config.FFmpegPath = ExecutableFinder.FindExecutableFromPATH("ffmpeg")!;
config.FFprobePath = ExecutableFinder.FindExecutableFromPATH("ffprobe")!;
config.OutputPathResolver = new HlsOutputPathResolver(outputDirectory);

config.DownsamplingFilters = new DownsamplingFilter[]{
new DownsamplingFilter(
Name: "360p",
Height: 360,
MaxVideoBitrate: "600k",
MaxAudioBitrate: "64k"
),

new DownsamplingFilter(
Name: "480p",
Height: 480,
MaxVideoBitrate: "1500k",
MaxAudioBitrate: "128k"
),

new DownsamplingFilter(
Name: "720p",
Height: 720,
MaxVideoBitrate: "3000k",
MaxAudioBitrate: "256k"
)
};
})
)
)
.ConfigureLogging(options => options.AddConsole())
.Build();
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102 changes: 67 additions & 35 deletions samples/LiveStreamingServerNet.AdaptiveHlsDemo/Program.cs
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Expand Up @@ -19,8 +19,8 @@ public static async Task Main(string[] args)
builder.Services.AddCors(options =>
options.AddDefaultPolicy(policy =>
policy.AllowAnyHeader()
.AllowAnyOrigin()
.AllowAnyMethod()
.AllowAnyOrigin()
.AllowAnyMethod()
)
);

Expand All @@ -47,42 +47,74 @@ private static IServiceCollection AddLiveStreamingServer(this IServiceCollection
new StreamProcessorEventListener(
svc.GetRequiredService<ILogger<StreamProcessorEventListener>>()));
})
.AddAdaptiveHlsTranscoder(options =>
{
options.FFmpegPath = ExecutableFinder.FindExecutableFromPATH("ffmpeg")!;
options.FFprobePath = ExecutableFinder.FindExecutableFromPATH("ffprobe")!;

options.DownsamplingFilters =
[
new DownsamplingFilter(
Name: "360p",
Height: 360,
MaxVideoBitrate: "600k",
MaxAudioBitrate: "64k"
),

new DownsamplingFilter(
Name: "480p",
Height: 480,
MaxVideoBitrate: "1500k",
MaxAudioBitrate: "128k"
),

new DownsamplingFilter(
Name: "720p",
Height: 720,
MaxVideoBitrate: "3000k",
MaxAudioBitrate: "256k"
)
];

// Hardware acceleration
// options.VideoDecodingArguments = "-hwaccel auto -c:v h264_cuvid";
// options.VideoEncodingArguments = "-c:v h264_nvenc -g 30";
})
.AddAdaptiveHlsTranscoder(configure =>
configure.ConfigureDefault(config =>
{
config.FFmpegPath = ExecutableFinder.FindExecutableFromPATH("ffmpeg")!;
config.FFprobePath = ExecutableFinder.FindExecutableFromPATH("ffprobe")!;

config.DownsamplingFilters =
[
new DownsamplingFilter(
Name: "360p",
Height: 360,
MaxVideoBitrate: "600k",
MaxAudioBitrate: "64k"
),

new DownsamplingFilter(
Name: "480p",
Height: 480,
MaxVideoBitrate: "1500k",
MaxAudioBitrate: "128k"
),

new DownsamplingFilter(
Name: "720p",
Height: 720,
MaxVideoBitrate: "3000k",
MaxAudioBitrate: "256k"
)
];

// Hardware acceleration
// options.VideoDecodingArguments = "-hwaccel auto -c:v h264_cuvid";
// options.VideoEncodingArguments = "-c:v h264_nvenc -g 30";
}).UseConfigurationResolver(new CustomAdaptiveHlsTranscoderConfigurationResolver())
)
);
}

private class CustomAdaptiveHlsTranscoderConfigurationResolver : IAdaptiveHlsTranscoderConfigurationResolver
{
public ValueTask<AdaptiveHlsTranscoderConfiguration?> ResolveAsync(
IServiceProvider services, Guid contextIdentifier, string streamPath, IReadOnlyDictionary<string, string> streamArguments)
{
if (!streamArguments.ContainsKey("lowquality"))
{
return ValueTask.FromResult<AdaptiveHlsTranscoderConfiguration?>(null);
}

var config = new AdaptiveHlsTranscoderConfiguration
{
FFmpegPath = ExecutableFinder.FindExecutableFromPATH("ffmpeg")!,
FFprobePath = ExecutableFinder.FindExecutableFromPATH("ffprobe")!,

DownsamplingFilters =
[
new DownsamplingFilter(
Name: "360p",
Height: 360,
MaxVideoBitrate: "600k",
MaxAudioBitrate: "64k"
)
]
};

return ValueTask.FromResult<AdaptiveHlsTranscoderConfiguration?>(config);
}
}

private class StreamProcessorEventListener : IStreamProcessorEventHandler
{
private readonly ILogger _logger;
Expand Down
109 changes: 56 additions & 53 deletions samples/LiveStreamingServerNet.AdaptiveHlsWithCustomFiltersDemo/Program.cs
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Expand Up @@ -17,8 +17,8 @@ public static async Task Main(string[] args)
builder.Services.AddCors(options =>
options.AddDefaultPolicy(policy =>
policy.AllowAnyHeader()
.AllowAnyOrigin()
.AllowAnyMethod()
.AllowAnyOrigin()
.AllowAnyMethod()
)
);

Expand All @@ -40,64 +40,67 @@ private static IServiceCollection AddLiveStreamingServer(this IServiceCollection
options => options
.Configure(options => options.EnableGopCaching = false)
.AddStreamProcessor()
.AddAdaptiveHlsTranscoder(options =>
{
options.FFmpegPath = ExecutableFinder.FindExecutableFromPATH("ffmpeg")!;
options.FFprobePath = ExecutableFinder.FindExecutableFromPATH("ffprobe")!;
.AddAdaptiveHlsTranscoder(configure =>
configure.ConfigureDefault(config =>
{
config.FFmpegPath = ExecutableFinder.FindExecutableFromPATH("ffmpeg")!;
config.FFprobePath = ExecutableFinder.FindExecutableFromPATH("ffprobe")!;

// Add an icon as the second input to the FFmpeg command
options.AdditionalInputs = [Path.Combine(Directory.GetCurrentDirectory(), "icon.png")];
// Add an icon as the second input to the FFmpeg command
config.AdditionalInputs = [Path.Combine(Directory.GetCurrentDirectory(), "icon.png")];

// Add custom complex filters to scale the icon to different sizes
options.AdditionalComplexFilters = [
"[1:v]scale=-2:64[icon360]",
"[1:v]scale=-2:85[icon480]",
"[1:v]scale=-2:128[icon720]",
"[1:v]scale=-2:128[icon720t]"
];
// Add custom complex filters to scale the icon to different sizes
config.AdditionalComplexFilters =
[
"[1:v]scale=-2:64[icon360]",
"[1:v]scale=-2:85[icon480]",
"[1:v]scale=-2:128[icon720]",
"[1:v]scale=-2:128[icon720t]"
];

// Add custom audio filters to reduce the volume by half
options.AudioFilters = ["volume=0.5"];
// Add custom audio filters to reduce the volume by half
config.AudioFilters = ["volume=0.5"];

options.DownsamplingFilters =
[
new DownsamplingFilter(
Name: "360p",
Height: 360,
MaxVideoBitrate: "600k",
MaxAudioBitrate: "64k",
// Overlay the icon360 on the video
VideoFilter: ["[icon360]overlay"]
),
config.DownsamplingFilters =
[
new DownsamplingFilter(
Name: "360p",
Height: 360,
MaxVideoBitrate: "600k",
MaxAudioBitrate: "64k",
// Overlay the icon360 on the video
VideoFilter: ["[icon360]overlay"]
),

new DownsamplingFilter(
Name: "480p",
Height: 480,
MaxVideoBitrate: "1500k",
MaxAudioBitrate: "128k",
// Overlay the icon480 on the video
VideoFilter: ["[icon480]overlay"]
),
new DownsamplingFilter(
Name: "480p",
Height: 480,
MaxVideoBitrate: "1500k",
MaxAudioBitrate: "128k",
// Overlay the icon480 on the video
VideoFilter: ["[icon480]overlay"]
),

new DownsamplingFilter(
Name: "720p",
Height: 720,
MaxVideoBitrate: "3000k",
MaxAudioBitrate: "256k",
// Overlay the icon720 on the video
VideoFilter: ["[icon720]overlay"]
),
new DownsamplingFilter(
Name: "720p",
Height: 720,
MaxVideoBitrate: "3000k",
MaxAudioBitrate: "256k",
// Overlay the icon720 on the video
VideoFilter: ["[icon720]overlay"]
),

new DownsamplingFilter(
Name: "720p_rotated",
Height: 720,
MaxVideoBitrate: "3000k",
MaxAudioBitrate: "256k",
// Overlay the icon720t on the video, and rotate the video 90 degrees
VideoFilter: ["[icon720t]overlay", "transpose=1"]
),
];
})
new DownsamplingFilter(
Name: "720p_rotated",
Height: 720,
MaxVideoBitrate: "3000k",
MaxAudioBitrate: "256k",
// Overlay the icon720t on the video, and rotate the video 90 degrees
VideoFilter: ["[icon720t]overlay", "transpose=1"]
),
];
})
)
);
}
}
Expand Down
20 changes: 20 additions & 0 deletions ...reamingServerNet.StreamProcessor/Contracts/IAdaptiveHlsTranscoderConfigurationResolver.cs
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@@ -0,0 +1,20 @@
using LiveStreamingServerNet.StreamProcessor.Hls.Configurations;

namespace LiveStreamingServerNet.StreamProcessor.Contracts
{
/// <summary>
/// Defines a contract for resolving adaptive HLS transcoder configurations based on stream context.
/// </summary>
public interface IAdaptiveHlsTranscoderConfigurationResolver
{
/// <summary>
/// Resolves the adaptive HLS transcoder configuration based on the provided stream path and arguments.
/// </summary>
/// <param name="services">Service provider for accessing dependencies</param>
/// <param name="contextIdentifier">Unique identifier for the processing context</param>
/// <param name="streamPath">Original path of the stream being processed</param>
/// <param name="streamArguments">Additional arguments associated with the stream</param>
/// <returns>The resolved adaptive HLS transcoder configuration, or null to use the default configuration</returns>
ValueTask<AdaptiveHlsTranscoderConfiguration?> ResolveAsync(IServiceProvider services, Guid contextIdentifier, string streamPath, IReadOnlyDictionary<string, string> streamArguments);
}
}
9 changes: 0 additions & 9 deletions ...reamingServerNet.StreamProcessor/Hls/Configurations/AdaptiveHlsTranscoderConfiguration.cs
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Expand Up @@ -136,15 +136,6 @@ public class AdaptiveHlsTranscoderConfiguration
/// Default: 30 seconds.
/// </summary>
public TimeSpan? CleanupDelay { get; set; } = TimeSpan.FromSeconds(30);

/// <summary>
/// Default output path resolver that creates paths in a subdirectory of the current working directory.
/// Path format: "./output/{contextIdentifier}/output.m3u8".
/// </summary>
public static Task<string> DefaultOutputPathResolver(Guid contextIdentifier, string streamPath, IReadOnlyDictionary<string, string> streamArguments)
{
return Task.FromResult(Path.Combine(Directory.GetCurrentDirectory(), "output", contextIdentifier.ToString(), "output.m3u8"));
}
}

/// <summary>
Expand Down
39 changes: 39 additions & 0 deletions src/LiveStreamingServerNet.StreamProcessor/Installer/AdaptiveHlsTranscoderConfigurator.cs
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@@ -0,0 +1,39 @@
using LiveStreamingServerNet.StreamProcessor.Contracts;
using LiveStreamingServerNet.StreamProcessor.Hls.Configurations;
using LiveStreamingServerNet.StreamProcessor.Installer.Contracts;

namespace LiveStreamingServerNet.StreamProcessor.Installer
{
public class AdaptiveHlsTranscoderConfigurator : IAdaptiveHlsTranscoderConfigurator
{
private readonly AdaptiveHlsTranscoderConfiguratorContext _context;

public AdaptiveHlsTranscoderConfigurator(AdaptiveHlsTranscoderConfiguratorContext context)
{
_context = context;
}

public IAdaptiveHlsTranscoderConfigurator ConfigureDefault(Action<AdaptiveHlsTranscoderConfiguration> configure)
{
configure.Invoke(_context.Configuration);
return this;
}

public IAdaptiveHlsTranscoderConfigurator UseConfigurationResolver(IAdaptiveHlsTranscoderConfigurationResolver resolver)
{
_context.ConfigurationResolver = resolver;
return this;
}
}

public class AdaptiveHlsTranscoderConfiguratorContext
{
public AdaptiveHlsTranscoderConfiguration Configuration { get; }
public IAdaptiveHlsTranscoderConfigurationResolver? ConfigurationResolver { get; set; }

public AdaptiveHlsTranscoderConfiguratorContext(AdaptiveHlsTranscoderConfiguration configuration)
{
Configuration = configuration;
}
}
}
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