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Fix near-1:1 SAR values falsely flagged as anamorphic

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Encoders sometimes produce sample aspect ratios like 3201:3200
(0.03% off square) for content that has effectively square pixels.
The exact string comparison against "1:1" marks these as anamorphic,
which triggers unnecessary transcoding on clients that require
non-anamorphic video.

Parse the SAR ratio numerically and treat values within 1% of 1:1
as square pixels. This threshold is well clear of the nearest real
anamorphic SAR (PAL 4:3 at 16:15 = 6.67% off).
This commit is contained in:
NoFear0411
2026-03-01 00:00:05 +04:00
parent e6d73ae367
commit bc316b3dc8
2 changed files with 45 additions and 1 deletions
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28
MediaBrowser.MediaEncoding/Probing/ProbeResultNormalizer.cs
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@@ -863,7 +863,7 @@ namespace MediaBrowser.MediaEncoding.Probing
{
stream.IsAnamorphic = false;
}
else if (string.Equals(streamInfo.SampleAspectRatio, "1:1", StringComparison.Ordinal))
else if (IsNearSquarePixelSar(streamInfo.SampleAspectRatio))
{
stream.IsAnamorphic = false;
}
@@ -1154,6 +1154,32 @@ namespace MediaBrowser.MediaEncoding.Probing
return Math.Abs(d1 - d2) <= variance;
}
/// <summary>
/// Determines whether a sample aspect ratio represents square (or near-square) pixels.
/// Some encoders produce SARs like 3201:3200 for content that is effectively 1:1,
/// which would be falsely classified as anamorphic by an exact string comparison.
/// A 1% tolerance safely covers encoder rounding artifacts while preserving detection
/// of genuine anamorphic content (closest standard is PAL 4:3 at 16:15 = 6.67% off).
/// </summary>
internal static bool IsNearSquarePixelSar(string sar)
{
if (string.IsNullOrEmpty(sar))
{
return false;
}
var parts = sar.Split(':');
if (parts.Length == 2
&& double.TryParse(parts[0], CultureInfo.InvariantCulture, out var num)
&& double.TryParse(parts[1], CultureInfo.InvariantCulture, out var den)
&& den > 0)
{
return IsClose(num / den, 1.0, 0.01);
}
return string.Equals(sar, "1:1", StringComparison.Ordinal);
}
/// <summary>
/// Gets a frame rate from a string value in ffprobe output
/// This could be a number or in the format of 2997/125.