Port over LunaMoo's compat flag for The Warriors video playback

This reverts to the old behavior before we started parsing mpeg headers,
that is, in 558b462 which is part of #8867.

LunaMoo has this under "HackFixVideo" in his build.

See #8991. This doesn't really "fix" that, but works around it.

Core/Compatibility.cpp

@@ -140,6 +140,7 @@ void Compatibility::CheckSettings(IniFile &iniFile, const std::string &gameID) {
 	CheckSetting(iniFile, gameID, "FramebufferAllowLargeVerticalOffset", &flags_.FramebufferAllowLargeVerticalOffset);
 	CheckSetting(iniFile, gameID, "DisableMemcpySlicing", &flags_.DisableMemcpySlicing);
 	CheckSetting(iniFile, gameID, "ForceEnableGPUReadback", &flags_.ForceEnableGPUReadback);
+	CheckSetting(iniFile, gameID, "UseFFMPEGFindStreamInfo", &flags_.UseFFMPEGFindStreamInfo);
 }
 
 void Compatibility::CheckVRSettings(IniFile &iniFile, const std::string &gameID) {

Core/Compatibility.h

@@ -110,6 +110,7 @@ struct CompatFlags {
 	bool FramebufferAllowLargeVerticalOffset;
 	bool DisableMemcpySlicing;
 	bool ForceEnableGPUReadback;
+	bool UseFFMPEGFindStreamInfo;
 };
 
 struct VRCompat {

Core/HW/MediaEngine.cpp

@@ -18,6 +18,7 @@
 #include "Common/Serialize/SerializeFuncs.h"
 #include "Common/Math/CrossSIMD.h"
 #include "Core/Config.h"
+#include "Core/Core.h"
 #include "Core/Debugger/MemBlockInfo.h"
 #include "Core/HW/MediaEngine.h"
 #include "Core/MemMap.h"
@@ -303,14 +304,16 @@ bool MediaEngine::openContext(bool keepReadPos) {
 	}
 	av_dict_free(&open_opt);
 
-	if (!SetupStreams()) {
+	bool usedFFMPEGFindStreamInfo = false;
+	if (!SetupStreams() || PSP_CoreParameter().compat.flags().UseFFMPEGFindStreamInfo) {
 		// Fallback to old behavior.  Reads too much and corrupts when game doesn't read fast enough.
 		// SetupStreams sometimes work for newer FFmpeg 3.1+ now, but sometimes framerate is missing.
 		WARN_LOG_REPORT_ONCE(setupStreams, Log::ME, "Failed to read valid video stream data from header");
 		if (avformat_find_stream_info(m_pFormatCtx, nullptr) < 0) {
 			closeContext();
 			return false;
 		}
+		usedFFMPEGFindStreamInfo = true;
 	}
 
 	if (m_videoStream >= (int)m_pFormatCtx->nb_streams) {
@@ -342,6 +345,11 @@ bool MediaEngine::openContext(bool keepReadPos) {
 	setVideoDim();
 	m_audioContext = CreateAudioDecoder((PSPAudioType)m_audioType);
 	m_isVideoEnd = false;
+
+	if (PSP_CoreParameter().compat.flags().UseFFMPEGFindStreamInfo && usedFFMPEGFindStreamInfo) {
+		m_mpegheaderReadPos++;
+		av_seek_frame(m_pFormatCtx, m_videoStream, 0, 0);
+	}
 #endif // USE_FFMPEG
 	return true;
 }

assets/compat.ini

@@ -1364,6 +1364,11 @@ UCET00278 = true
 UCUS98670 = true
 UCUS98646 = true
 
+[UseFFMPEGFindStreamInfo]
+# The Warriors: Works around regression (#8991) by reverting to the old behavior
+ULUS10213 = true
+ULES00483 = true
+
 [ForceLowerResolutionForEffectsOn]
 # The water effect of DiRT 2 and Outrun doesn't work in higher resolutions.