fix watermark when no video filters are required (#367)

CHANGELOG.md

@@ -15,6 +15,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Fix loading artwork in Kodi
   - Use fake image extension (`.jpg`) for artwork in M3U and XMLTV since Kodi detects MIME type from URL
   - Enable HEAD requests for IPTV image paths since Kodi requires those
+- Properly display watermark when no other video filters (like scaling or padding) are required
 
 ## [0.0.56-alpha] - 2021-09-10
 ### Added

ErsatzTV.Core.Tests/FFmpeg/FFmpegComplexFilterBuilderTests.cs

@@ -4,6 +4,7 @@ using ErsatzTV.Core.FFmpeg;
 using FluentAssertions;
 using LanguageExt;
 using NUnit.Framework;
+using static LanguageExt.Prelude;
 
 namespace ErsatzTV.Core.Tests.FFmpeg
 {
@@ -113,6 +114,161 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     });
             }
 
+            [Test]
+            [TestCase(
+                false,
+                false,
+                false,
+                ChannelWatermarkLocation.BottomLeft,
+                false,
+                100,
+                "[0:0][1:v]overlay=x=134:y=H-h-54[v]",
+                "0:1",
+                "[v]")]
+            [TestCase(
+                false,
+                false,
+                false,
+                ChannelWatermarkLocation.BottomRight,
+                false,
+                100,
+                "[0:0][1:v]overlay=x=W-w-134:y=H-h-54[v]",
+                "0:1",
+                "[v]")]
+            [TestCase(
+                false,
+                false,
+                false,
+                ChannelWatermarkLocation.TopLeft,
+                false,
+                100,
+                "[0:0][1:v]overlay=x=134:y=54[v]",
+                "0:1",
+                "[v]")]
+            [TestCase(
+                false,
+                false,
+                false,
+                ChannelWatermarkLocation.TopRight,
+                false,
+                100,
+                "[0:0][1:v]overlay=x=W-w-134:y=54[v]",
+                "0:1",
+                "[v]")]
+            [TestCase(
+                false,
+                false,
+                true,
+                ChannelWatermarkLocation.TopLeft,
+                false,
+                100,
+                "[0:0][1:v]overlay=x=134:y=54:enable='lt(mod(mod(time(0),60*60),10*60),15)'[v]",
+                "0:1",
+                "[v]")]
+            [TestCase(
+                false,
+                false,
+                false,
+                ChannelWatermarkLocation.TopLeft,
+                true,
+                100,
+                "[1:v]scale=384:-1[wmp];[0:0][wmp]overlay=x=134:y=54[v]",
+                "0:1",
+                "[v]")]
+            [TestCase(
+                false,
+                false,
+                false,
+                ChannelWatermarkLocation.TopLeft,
+                false,
+                90,
+                "[1:v]format=yuva420p|yuva444p|yuva422p|rgba|abgr|bgra|gbrap|ya8,colorchannelmixer=aa=0.90[wmp];[0:0][wmp]overlay=x=134:y=54[v]",
+                "0:1",
+                "[v]")]
+            [TestCase(
+                false,
+                true,
+                false,
+                ChannelWatermarkLocation.TopLeft,
+                false,
+                100,
+                "[0:0]yadif=1[vt];[vt][1:v]overlay=x=134:y=54[v]",
+                "0:1",
+                "[v]")]
+            [TestCase(
+                false,
+                true,
+                false,
+                ChannelWatermarkLocation.TopLeft,
+                true,
+                100,
+                "[0:0]yadif=1[vt];[1:v]scale=384:-1[wmp];[vt][wmp]overlay=x=134:y=54[v]",
+                "0:1",
+                "[v]")]
+            [TestCase(
+                true,
+                true,
+                false,
+                ChannelWatermarkLocation.TopLeft,
+                false,
+                100,
+                "[0:1]apad=whole_dur=3300000ms[a];[0:0]yadif=1[vt];[vt][1:v]overlay=x=134:y=54[v]",
+                "[a]",
+                "[v]")]
+            [TestCase(
+                true,
+                false,
+                false,
+                ChannelWatermarkLocation.TopLeft,
+                false,
+                100,
+                "[0:1]apad=whole_dur=3300000ms[a];[0:0][1:v]overlay=x=134:y=54[v]",
+                "[a]",
+                "[v]")]
+            public void Should_Return_Watermark(
+                bool alignAudio,
+                bool deinterlace,
+                bool intermittent,
+                ChannelWatermarkLocation location,
+                bool scaled,
+                int opacity,
+                string expectedVideoFilter,
+                string expectedAudioLabel,
+                string expectedVideoLabel)
+            {
+                FFmpegComplexFilterBuilder builder = new FFmpegComplexFilterBuilder()
+                    .WithWatermark(
+                        Some(
+                            new ChannelWatermark
+                            {
+                                Mode = intermittent
+                                    ? ChannelWatermarkMode.Intermittent
+                                    : ChannelWatermarkMode.Permanent,
+                                DurationSeconds = intermittent ? 15 : 0,
+                                FrequencyMinutes = intermittent ? 10 : 0,
+                                Location = location,
+                                Size = scaled ? ChannelWatermarkSize.Scaled : ChannelWatermarkSize.ActualSize,
+                                WidthPercent = scaled ? 20 : 0,
+                                Opacity = opacity,
+                                HorizontalMarginPercent = 7,
+                                VerticalMarginPercent = 5
+                            }),
+                        new Resolution { Width = 1920, Height = 1080 })
+                    .WithDeinterlace(deinterlace)
+                    .WithAlignedAudio(alignAudio ? Some(TimeSpan.FromMinutes(55)) : None);
+
+                Option<FFmpegComplexFilter> result = builder.Build(0, 1);
+
+                result.IsSome.Should().BeTrue();
+                result.IfSome(
+                    filter =>
+                    {
+                        filter.ComplexFilter.Should().Be(expectedVideoFilter);
+                        filter.AudioLabel.Should().Be(expectedAudioLabel);
+                        filter.VideoLabel.Should().Be(expectedVideoLabel);
+                    });
+            }
+
             [Test]
             [TestCase(true, false, false, "[0:0]deinterlace_qsv[v]", "[v]")]
             [TestCase(

ErsatzTV.Core/FFmpeg/FFmpegComplexFilterBuilder.cs

@@ -233,28 +233,39 @@ namespace ErsatzTV.Core.FFmpeg
                 complexFilter.Append(audioLabel);
             }
 
-            if (videoFilterQueue.Any())
+            if (videoFilterQueue.Any() || !string.IsNullOrWhiteSpace(watermarkOverlay))
             {
                 if (hasAudioFilters)
                 {
                     complexFilter.Append(';');
                 }
 
-                complexFilter.Append($"[{videoLabel}]");
-                var filters = string.Join(",", videoFilterQueue);
-                complexFilter.Append(filters);
+                if (videoFilterQueue.Any())
+                {
+                    complexFilter.Append($"[{videoLabel}]");
+                    var filters = string.Join(",", videoFilterQueue);
+                    complexFilter.Append(filters);
+                }
 
                 if (!string.IsNullOrWhiteSpace(watermarkOverlay))
                 {
-                    complexFilter.Append("[vt]");
+                    if (videoFilterQueue.Any())
+                    {
+                        complexFilter.Append("[vt];");
+                    }
+
                     var watermarkLabel = "[1:v]";
                     if (!string.IsNullOrWhiteSpace(watermarkPreprocess))
                     {
-                        complexFilter.Append($";{watermarkLabel}{watermarkPreprocess}[wmp]");
+                        complexFilter.Append($"{watermarkLabel}{watermarkPreprocess}[wmp];");
                         watermarkLabel = "[wmp]";
                     }
 
-                    complexFilter.Append($";[vt]{watermarkLabel}{watermarkOverlay}");
+                    complexFilter.Append(
+                        videoFilterQueue.Any()
+                            ? $"[vt]{watermarkLabel}{watermarkOverlay}"
+                            : $"[{videoLabel}]{watermarkLabel}{watermarkOverlay}");
+
                     if (usesSoftwareFilters && acceleration != HardwareAccelerationKind.None)
                     {
                         complexFilter.Append(",hwupload");