Source: @pullmoll
Upstream: no
Reason: ffms2 no longer provides color space enum values; use the ffmpeg ones

--- a/src/ffmpegsource_common.cpp	2014-12-08 01:07:09.000000000 +0100
+++ b/src/ffmpegsource_common.cpp	2021-01-18 21:12:42.209582337 +0100
@@ -98,7 +98,6 @@
 			ps->SetProgress(Current, Total);
 			return ps->IsCancelled();
 		};
-		Index = FFMS_DoIndexing(Indexer, Trackmask, FFMS_TRACKMASK_NONE,
-			nullptr, nullptr, IndexEH, callback, ps, &ErrInfo);
+		Index = FFMS_DoIndexing2(Indexer, FFMS_IEH_ABORT, &ErrInfo);
 	});
 
--- a/src/video_provider_ffmpegsource.cpp	2014-12-08 01:07:09.000000000 +0100
+++ b/src/video_provider_ffmpegsource.cpp	2021-01-18 21:07:47.205800051 +0100
@@ -42,6 +42,7 @@
 
 #include <libaegisub/fs.h>
 #include <libaegisub/make_unique.h>
+#include <libavutil/pixfmt.h>
 
 namespace {
 /// @class FFmpegSourceVideoProvider
@@ -78,7 +79,7 @@
 		if (matrix == RealColorSpace)
 			FFMS_SetInputFormatV(VideoSource, CS, CR, FFMS_GetPixFmt(""), nullptr);
 		else if (matrix == "TV.601")
-			FFMS_SetInputFormatV(VideoSource, FFMS_CS_BT470BG, CR, FFMS_GetPixFmt(""), nullptr);
+			FFMS_SetInputFormatV(VideoSource, AVCOL_SPC_BT470BG, CR, FFMS_GetPixFmt(""), nullptr);
 		else
 			return;
 		ColorSpace = matrix;
@@ -103,16 +104,16 @@
 	std::string str = cr == FFMS_CR_JPEG ? "PC" : "TV";
 
 	switch (cs) {
-		case FFMS_CS_RGB:
+		case AVCOL_SPC_RGB:
 			return "None";
-		case FFMS_CS_BT709:
+		case AVCOL_SPC_BT709:
 			return str + ".709";
-		case FFMS_CS_FCC:
+		case AVCOL_SPC_FCC:
 			return str + ".FCC";
-		case FFMS_CS_BT470BG:
-		case FFMS_CS_SMPTE170M:
+		case AVCOL_SPC_BT470BG:
+		case AVCOL_SPC_SMPTE170M:
 			return str + ".601";
-		case FFMS_CS_SMPTE240M:
+		case AVCOL_SPC_SMPTE240M:
 			return str + ".240M";
 		default:
 			throw VideoOpenError("Unknown video color space");
@@ -208,8 +209,6 @@
 
 	// set thread count
 	int Threads = OPT_GET("Provider/Video/FFmpegSource/Decoding Threads")->GetInt();
-	if (FFMS_GetVersion() < ((2 << 24) | (17 << 16) | (2 << 8) | 1) && FFMS_GetSourceType(Index) == FFMS_SOURCE_LAVF)
-		Threads = 1;
 
 	// set seekmode
 	// TODO: give this its own option?
@@ -240,15 +239,15 @@
 	CS = TempFrame->ColorSpace;
 	CR = TempFrame->ColorRange;
 
-	if (CS == FFMS_CS_UNSPECIFIED)
-		CS = Width > 1024 || Height >= 600 ? FFMS_CS_BT709 : FFMS_CS_BT470BG;
+	if (CS == AVCOL_SPC_UNSPECIFIED)
+		CS = Width > 1024 || Height >= 600 ? AVCOL_SPC_BT709 : AVCOL_SPC_BT470BG;
 	RealColorSpace = ColorSpace = colormatrix_description(CS, CR);
 
 #if FFMS_VERSION >= ((2 << 24) | (17 << 16) | (1 << 8) | 0)
-	if (CS != FFMS_CS_RGB && CS != FFMS_CS_BT470BG && ColorSpace != colormatrix && (colormatrix == "TV.601" || OPT_GET("Video/Force BT.601")->GetBool())) {
-		if (FFMS_SetInputFormatV(VideoSource, FFMS_CS_BT470BG, CR, FFMS_GetPixFmt(""), &ErrInfo))
+	if (CS != AVCOL_SPC_RGB && CS != AVCOL_SPC_BT470BG && ColorSpace != colormatrix && (colormatrix == "TV.601" || OPT_GET("Video/Force BT.601")->GetBool())) {
+		if (FFMS_SetInputFormatV(VideoSource, AVCOL_SPC_BT470BG, CR, FFMS_GetPixFmt(""), &ErrInfo))
 			throw VideoOpenError(std::string("Failed to set input format: ") + ErrInfo.Buffer);
-		ColorSpace = colormatrix_description(FFMS_CS_BT470BG, CR);
+		ColorSpace = colormatrix_description(AVCOL_SPC_BT470BG, CR);
 	}
 #endif