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@@ -1,4 +1,8 @@
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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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@@ -7,12 +11,85 @@ namespace Jellyfin.MediaEncoding.Keyframes.FfProbe
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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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+
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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) => throw new NotImplementedException();
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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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+
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+ CreateNoWindow = true,
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+ UseShellExecute = false,
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+ RedirectStandardOutput = true,
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+
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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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+
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+ process.Start();
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+
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+ return ParseStream(process.StandardOutput);
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+ }
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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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+
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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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+
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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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+
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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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+
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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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