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96 lines
3.8 KiB
96 lines
3.8 KiB
using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Globalization;
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using System.IO;
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namespace Jellyfin.MediaEncoding.Keyframes.FfProbe
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{
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/// <summary>
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/// FfProbe based keyframe extractor.
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/// </summary>
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public static class FfProbeKeyframeExtractor
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{
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private const string DefaultArguments = "-v error -skip_frame nokey -show_entries format=duration -show_entries stream=duration -show_entries packet=pts_time,flags -select_streams v -of csv \"{0}\"";
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/// <summary>
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/// Extracts the keyframes using the ffprobe executable at the specified path.
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/// </summary>
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/// <param name="ffProbePath">The path to the ffprobe executable.</param>
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/// <param name="filePath">The file path.</param>
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/// <returns>An instance of <see cref="KeyframeData"/>.</returns>
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public static KeyframeData GetKeyframeData(string ffProbePath, string filePath)
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{
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using var process = new Process
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{
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StartInfo = new ProcessStartInfo
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{
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FileName = ffProbePath,
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Arguments = string.Format(CultureInfo.InvariantCulture, DefaultArguments, filePath),
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CreateNoWindow = true,
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UseShellExecute = false,
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RedirectStandardOutput = true,
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WindowStyle = ProcessWindowStyle.Hidden,
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ErrorDialog = false,
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},
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EnableRaisingEvents = true
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};
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process.Start();
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return ParseStream(process.StandardOutput);
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}
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internal static KeyframeData ParseStream(StreamReader reader)
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{
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var keyframes = new List<long>();
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double streamDuration = 0;
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double formatDuration = 0;
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while (!reader.EndOfStream)
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{
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var line = reader.ReadLine().AsSpan();
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if (line.IsEmpty)
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{
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continue;
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}
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var firstComma = line.IndexOf(',');
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var lineType = line[..firstComma];
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var rest = line[(firstComma + 1)..];
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if (lineType.Equals("packet", StringComparison.OrdinalIgnoreCase))
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{
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if (rest.EndsWith(",K_"))
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{
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// Trim the flags from the packet line. Example line: packet,7169.079000,K_
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var keyframe = double.Parse(rest[..^3], NumberStyles.AllowDecimalPoint, CultureInfo.InvariantCulture);
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// Have to manually convert to ticks to avoid rounding errors as TimeSpan is only precise down to 1 ms when converting double.
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keyframes.Add(Convert.ToInt64(keyframe * TimeSpan.TicksPerSecond));
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}
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}
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else if (lineType.Equals("stream", StringComparison.OrdinalIgnoreCase))
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{
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if (double.TryParse(rest, NumberStyles.AllowDecimalPoint, CultureInfo.InvariantCulture, out var streamDurationResult))
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{
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streamDuration = streamDurationResult;
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}
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}
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else if (lineType.Equals("format", StringComparison.OrdinalIgnoreCase))
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{
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if (double.TryParse(rest, NumberStyles.AllowDecimalPoint, CultureInfo.InvariantCulture, out var formatDurationResult))
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{
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formatDuration = formatDurationResult;
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}
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}
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}
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// Prefer the stream duration as it should be more accurate
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var duration = streamDuration > 0 ? streamDuration : formatDuration;
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return new KeyframeData(TimeSpan.FromSeconds(duration).Ticks, keyframes);
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}
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}
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}
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