Merge branch 'vapoursynth' into feature

.gitignore

@@ -1,5 +1,6 @@
 /tests/data
 
+automation/vapoursynth/__pycache__
 packages/desktop/aegisub.desktop
 packages/desktop/aegisub.desktop.template
 src/libresrc/bitmap.cpp

automation/meson.build

@@ -41,3 +41,7 @@ install_data(
     'include/aegisub/unicode.moon',
     'include/aegisub/util.moon',
     install_dir: automation_dir / 'include' / 'aegisub')
+
+install_data(
+    'vapoursynth/aegisub_vs.py',
+    install_dir: automation_dir / 'vapoursynth')

automation/vapoursynth/aegisub_vs.py

@@ -0,0 +1,208 @@
+"""
+Utility functions for loading video files into Aegisub using the Vapoursynth
+video provider.
+
+When encountering a file whose file extension is not .py or .vpy, the
+Vapoursynth audio and video providers will execute the respective default
+script set in Aegisub's configuration, with the following string variables set:
+- filename: The path to the file that's being opened.
+- __aegi_data, __aegi_dictionary, __aegi_local, __aegi_script, __aegi_temp, __aegi_user:
+  The values of ?data, ?dictionary, etc. respectively.
+- __aegi_vscache: The path to a directory where the Vapoursynth script can
+  store cache files. This directory is cleaned by Aegisub when it gets too
+  large (as defined by Aegisub's configuration).
+
+The provider reads the video from the script's 0-th output node. By default,
+the video is assumed to be CFR. The script can pass further information to
+Aegisub using the following variables:
+    - __aegi_timecodes: List[int] | str: The timecodes for the video, or the
+      path to a timecodes file.
+    - __aegi_keyframes: List[int] | str: List of frame numbers to load as
+      keyframes, or the path to a keyframes file.
+    - __aegi_hasaudio: int: If nonzero, Aegisub will try to load an audio track
+      from the same file.
+
+This module provides some utility functions to obtain timecodes, keyframes, and
+other data.
+"""
+import os
+import os.path
+import re
+from collections import deque
+from typing import Any, Dict, List, Tuple
+
+import vapoursynth as vs
+core = vs.core
+
+def make_lwi_cache_filename(filename: str) -> str:
+    """
+    Given a path to a video, will return a file name like the one LWLibavSource
+    would use for a .lwi file.
+    """
+    max_len = 254
+    extension = ".lwi"
+
+    if len(filename) + len(extension) > max_len:
+        filename = filename[-(max_len + len(extension)):]
+
+    return "".join(("_" if c in "/\\:" else c) for c in filename) + extension
+
+
+def make_keyframes_filename(filename: str) -> str:
+    """
+    Given a path `path/to/file.mkv`, will return the path
+    `path/to/file_keyframes.txt`.
+    """
+    extlen = filename[::-1].find(".") + 1
+    return filename[:len(filename) - extlen] + "_keyframes.txt"
+
+
+lwindex_re1 = re.compile(r"Index=(?P<Index>-?[0-9]+),POS=(?P<POS>-?[0-9]+),PTS=(?P<PTS>-?[0-9]+),DTS=(?P<DTS>-?[0-9]+),EDI=(?P<EDI>-?[0-9]+)")
+lwindex_re2 = re.compile(r"Key=(?P<Key>-?[0-9]+),Pic=(?P<Pic>-?[0-9]+),POC=(?P<POC>-?[0-9]+),Repeat=(?P<Repeat>-?[0-9]+),Field=(?P<Field>-?[0-9]+)")
+streaminfo_re = re.compile(r"Codec=(?P<Codec>[0-9]+),TimeBase=(?P<TimeBase>[0-9\/]+),Width=(?P<Width>[0-9]+),Height=(?P<Height>[0-9]+),Format=(?P<Format>[0-9a-zA-Z]+),ColorSpace=(?P<ColorSpace>[0-9]+)")
+
+class LWIndexFrame:
+    pts: int
+    key: int
+
+    def __init__(self, raw: list[str]):
+        match1 = lwindex_re1.match(raw[0])
+        match2 = lwindex_re2.match(raw[1])
+        if not match1 or not match2:
+            raise ValueError("Invalid lwindex format")
+        self.pts = int(match1.group("PTS"))
+        self.key = int(match2.group("Key"))
+
+    def __int__(self) -> int:
+        return self.pts
+
+
+def info_from_lwindex(indexfile: str) -> Dict[str, List[int]]:
+    """
+    Given a path to an .lwi file, will return a dictionary containing
+    information about the video, with the keys
+    - timcodes: The timecodes.
+    - keyframes: Array of frame numbers of keyframes.
+    """
+    with open(indexfile, encoding="latin1") as f:
+        index = f.read().splitlines()
+
+    indexstart, indexend = index.index("</StreamInfo>") + 1, index.index("</LibavReaderIndex>")
+    frames = [LWIndexFrame(index[i:i+2]) for i in range(indexstart, indexend, 2)]
+    frames.sort(key=int)
+
+    streaminfo = streaminfo_re.match(index[indexstart - 2])
+    if not streaminfo:
+        raise ValueError("Invalid lwindex format")
+
+    timebase_num, timebase_den = [int(i) for i in streaminfo.group("TimeBase").split("/")]
+
+    return {
+        "timecodes": [(f.pts * 1000 * timebase_num) // timebase_den for f in frames],
+        "keyframes": [i for i, f in enumerate(frames) if f.key],
+    }
+
+
+def wrap_lwlibavsource(filename: str, cachedir: str, **kwargs: Any) -> Tuple[vs.VideoNode, Dict[str, List[int]]]:
+    """
+    Given a path to a video file and a directory to store index files in
+    (usually __aegi_vscache), will open the video with LWLibavSource and read
+    the generated .lwi file to obtain the timecodes and keyframes.
+    Additional keyword arguments are passed on to LWLibavSource.
+    """
+    try:
+        os.mkdir(cachedir)
+    except FileExistsError:
+        pass
+    cachefile = os.path.join(cachedir, make_lwi_cache_filename(filename))
+
+    if not hasattr(core, "lsmas"):
+        raise vs.Error("To use Aegisub's LWLibavSource wrapper, the `lsmas` plugin for VapourSynth must be installed")
+
+    if b"-Dcachedir" not in core.lsmas.Version()["config"]: # type: ignore
+        raise vs.Error("To use Aegisub's LWLibavSource wrapper, the `lsmas` plugin must support the `cachedir` option for LWLibavSource.")
+
+    clip = core.lsmas.LWLibavSource(source=filename, cachefile=cachefile, **kwargs)
+
+    return clip, info_from_lwindex(cachefile)
+
+
+def make_keyframes(clip: vs.VideoNode, use_scxvid: bool = False,
+                   resize_h: int = 360, resize_format: int = vs.YUV420P8,
+                   **kwargs: Any) -> List[int]:
+    """
+    Generates a list of keyframes from a clip, using either WWXD or Scxvid.
+    Will be slightly more efficient with the `akarin` plugin installed.
+
+    :param clip:             Clip to process.
+    :param use_scxvid:       Whether to use Scxvid. If False, the function uses WWXD.
+    :param resize_h:         Height to resize the clip to before processing.
+    :param resize_format:    Format to convert the clip to before processing.
+
+    The remaining keyword arguments are passed on to the respective filter.
+    """
+
+    clip = core.resize.Bilinear(clip, width=resize_h * clip.width // clip.height, height=resize_h, format=resize_format);
+    try:
+        clip = core.scxvid.Scxvid(clip, **kwargs) if use_scxvid else core.wwxd.WWXD(clip, **kwargs)
+    except AttributeError:
+        raise vs.Error("To use the keyframe generation, the `{}` plugin for VapourSynth must be installed"
+                       .format("scxvid" if use_scxvid else "wwxd"))
+
+    keyframes = {}
+    done = 0
+    def _cb(n: int, f: vs.VideoFrame) -> vs.VideoFrame:
+        nonlocal done
+        keyframes[n] = f.props._SceneChangePrev if use_scxvid else f.props.Scenechange # type: ignore
+        done += 1
+        if done % (clip.num_frames // 25) == 0:
+            vs.core.log_message(vs.MESSAGE_TYPE_INFORMATION, "Detecting keyframes... {}% done.\n".format(100 * done // clip.num_frames))
+        return f
+
+    deque(clip.std.ModifyFrame(clip, _cb).frames(close=True), 0)
+    vs.core.log_message(vs.MESSAGE_TYPE_INFORMATION, "Done detecting keyframes.\n")
+    return [n for n in range(clip.num_frames) if keyframes[n]]
+
+
+def save_keyframes(filename: str, keyframes: List[int]):
+    """
+    Saves a list of keyframes in Aegisub's keyframe format v1 to a file with
+    the given filename.
+    """
+    with open(filename, "w") as f:
+        f.write("# keyframe format v1\n")
+        f.write("fps 0\n")
+        f.write("".join(f"{n}\n" for n in keyframes))
+
+
+def get_keyframes(filename: str, clip: vs.VideoNode, **kwargs: Any) -> str:
+    """
+    When not already present, creates a keyframe file for the given clip next
+    to the given filename using WWXD or Scxvid (see the make_keyframes docstring).
+    Additional keyword arguments are passed on to make_keyframes.
+    """
+    kffilename = make_keyframes_filename(filename)
+
+    if not os.path.exists(kffilename):
+        vs.core.log_message(vs.MESSAGE_TYPE_INFORMATION, "No keyframes file found, detecting keyframes...\n")
+        keyframes = make_keyframes(clip, **kwargs)
+        save_keyframes(kffilename, keyframes)
+
+    return kffilename
+
+
+def check_audio(filename: str, **kwargs: Any) -> bool:
+    """
+    Checks whether the given file has an audio track by trying to open it with
+    BestAudioSource. Requires the `bas` plugin to return correct results, but
+    won't crash if it's not installed.
+    Additional keyword arguments are passed on to BestAudioSource.
+    """
+    try:
+        vs.core.bas.Source(source=filename, **kwargs)
+        return True
+    except AttributeError:
+        pass
+    except vs.Error:
+        pass
+    return False

libaegisub/include/libaegisub/background_runner.h

@@ -46,10 +46,15 @@ namespace agi {
 
 		/// @brief Log a message
 		///
-		/// If any messages are logged then the dialog will not automatically close
-		/// when the task finishes so that the user has the chance to read them.
+		/// If any messages are logged and StayOpen is set (set by default)
+		/// then the dialog will not automatically close when the task finishes
+		/// so that the user has the chance to read them.
 		virtual void Log(std::string const& str)=0;
 
+		/// Set whether the dialog should stay open after the task finishes.
+		/// Defaults to true.
+		virtual void SetStayOpen(bool stayopen)=0;
+
 		/// Has the user asked the task to cancel?
 		virtual bool IsCancelled()=0;
 	};

packages/win_installer/fragment_automation.iss

@@ -30,6 +30,8 @@ DestDir: {app}\automation\include; Source: {#SOURCE_ROOT}\automation\include\uni
 DestDir: {app}\automation\include; Source: {#SOURCE_ROOT}\automation\include\utils.lua; Flags: ignoreversion overwritereadonly uninsremovereadonly; Attribs: readonly; Components: main
 DestDir: {app}\automation\include; Source: {#SOURCE_ROOT}\automation\include\utils-auto4.lua; Flags: ignoreversion overwritereadonly uninsremovereadonly; Attribs: readonly; Components: main
 
+DestDir: {app}\automation\vapoursynth; Source: {#SOURCE_ROOT}\automation\vapoursynth\aegisub_vs.py; Flags: ignoreversion overwritereadonly uninsremovereadonly; Attribs: readonly; Components: main
+
 #ifdef DEPCTRL
 ; DepCtrl
 DestDir: {userappdata}\Aegisub\automation\include\l0; Source: {#DEPS_DIR}\DependencyControl\modules\*; Flags: ignoreversion recursesubdirs createallsubdirs; Components: macros\modules\depctrl

src/audio_provider_vs.cpp

@@ -165,7 +165,6 @@ VapoursynthAudioProvider::~VapoursynthAudioProvider() {
 }
 
 std::unique_ptr<agi::AudioProvider> CreateVapoursynthAudioProvider(agi::fs::path const& file, agi::BackgroundRunner *) {
-	agi::acs::CheckFileRead(file);
 	return agi::make_unique<VapoursynthAudioProvider>(file);
 }
 #endif

src/auto4_base.h

@@ -127,6 +127,7 @@ namespace Automation4 {
 		void SetMessage(std::string const& msg) override { impl->SetMessage(msg); }
 		void SetProgress(int64_t cur, int64_t max) override { impl->SetProgress(cur, max); }
 		void Log(std::string const& str) override { impl->Log(str); }
+		void SetStayOpen(bool stayopen) override { impl->SetStayOpen(stayopen); }
 		bool IsCancelled() override { return impl->IsCancelled(); }
 
 		/// Show the passed dialog on the GUI thread, blocking the calling

src/dialog_progress.cpp

@@ -73,6 +73,7 @@ namespace {
 class DialogProgressSink final : public agi::ProgressSink {
 	DialogProgress *dialog;
 	std::atomic<bool> cancelled{false};
+	std::atomic<bool> stayopen{true};
 	int progress = 0;
 
 public:
@@ -98,6 +99,14 @@ public:
 		Main().Async([=]{ dialog->pending_log += to_wx(str); });
 	}
 
+	void SetStayOpen(bool b) override {
+		stayopen = b;
+	}
+
+	bool GetStayOpen() {
+		return stayopen;
+	}
+
 	bool IsCancelled() override {
 		return cancelled;
 	}
@@ -169,7 +178,7 @@ void DialogProgress::Run(std::function<void(agi::ProgressSink*)> task) {
 			// so the user can read the debug output and switch the cancel button to a
 			// close button
 			bool cancelled = this->ps->IsCancelled();
-			if (cancelled || (log_output->IsEmpty() && !pending_log))
+			if (cancelled || !this->ps->GetStayOpen() || (log_output->IsEmpty() && !pending_log))
 				EndModal(!cancelled);
 			else {
 				if (!pending_log.empty()) {

src/libresrc/default_config.json

@@ -351,7 +351,7 @@
 				"Aegisub Cache" : true
 			},
 			"VapourSynth" : {
-				"Default Script" : "import vapoursynth as vs\nvs.core.bas.Source(source=filename).set_output()"
+				"Default Script" : "# This default script will load an audio file using BestAudioSource.\n# It requires the `bas` plugin.\n\nimport vapoursynth as vs\ntry:\n    vs.core.bas.Source(source=filename).set_output()\nexcept AttributeError:\n   raise vs.Error(\"To use Aegisub's default audio loader, the `bas` plugin for VapourSynth must be installed\")"
 			}
 		},
 		"Avisynth" : {
@@ -391,7 +391,8 @@
 				"Seek Preroll" : 12
 			},
 			"VapourSynth" : {
-				"Default Script" : "import vapoursynth as vs\nvs.core.lsmas.LWLibavSource(source=filename).set_output()"
+				"Log Level": "Information",
+				"Default Script" : "# This default script will load a video file using LWLibavSource.\n# It requires the `lsmas` plugin.\n# See ?data/automation/vapoursynth/aegisub_vs.py for more information.\n\nimport aegisub_vs as a\nimport vapoursynth as vs\n\nclip, videoinfo = a.wrap_lwlibavsource(filename, __aegi_vscache)\nclip.set_output()\n__aegi_timecodes = videoinfo[\"timecodes\"]\n__aegi_keyframes = videoinfo[\"keyframes\"]\n# Uncomment this to automatically generate keyframes at scene changes.\n#__aegi_keyframes = a.get_keyframes(filename, clip)\n\n# Check if the file has an audio track. This requires the `bas` plugin.\n__aegi_hasaudio = 1 if a.check_audio(filename) else 0"
 			}
 		}
 	},

src/libresrc/osx/default_config.json

@@ -351,7 +351,7 @@
 				"Aegisub Cache" : true
 			},
 			"VapourSynth" : {
-				"Default Script" : "import vapoursynth as vs\nvs.core.bas.Source(source=filename).set_output()"
+				"Default Script" : "# This default script will load an audio file using BestAudioSource.\n# It requires the `bas` plugin.\n\nimport vapoursynth as vs\ntry:\n    vs.core.bas.Source(source=filename).set_output()\nexcept AttributeError:\n   raise vs.Error(\"To use Aegisub's default audio loader, the `bas` plugin for VapourSynth must be installed\")"
 			}
 		},
 		"Avisynth" : {
@@ -391,7 +391,8 @@
 				"Seek Preroll" : 12
 			},
 			"VapourSynth" : {
-				"Default Script" : "import vapoursynth as vs\nvs.core.lsmas.LWLibavSource(source=filename).set_output()"
+				"Log Level": "Information",
+				"Default Script" : "# This default script will load a video file using LWLibavSource.\n# It requires the `lsmas` plugin.\n# See ?data/automation/vapoursynth/aegisub_vs.py for more information.\n\nimport aegisub_vs as a\nimport vapoursynth as vs\n\nclip, videoinfo = a.wrap_lwlibavsource(filename, __aegi_vscache)\nclip.set_output()\n__aegi_timecodes = videoinfo[\"timecodes\"]\n__aegi_keyframes = videoinfo[\"keyframes\"]\n# Uncomment this to automatically generate keyframes at scene changes.\n#__aegi_keyframes = a.get_keyframes(filename, clip)\n\n# Check if the file has an audio track. This requires the `bas` plugin.\n__aegi_hasaudio = 1 if a.check_audio(filename) else 0"
 			}
 		}
 	},

src/preferences.cpp

@@ -490,6 +490,12 @@ void Advanced_Video(wxTreebook *book, Preferences *parent) {
 void VapourSynth(wxTreebook *book, Preferences *parent) {
 #ifdef WITH_VAPOURSYNTH
 	auto p = new OptionPage(book, parent, _("VapourSynth"), OptionPage::PAGE_SUB);
+	auto general = p->PageSizer(_("General"));
+
+	const wxString log_levels[] = { "Quiet", "Fatal", "Critical", "Warning", "Information", "Debug" };
+	wxArrayString log_levels_choice(6, log_levels);
+	p->OptionChoice(general, _("Log Level"), log_levels_choice, "Provider/Video/VapourSynth/Log Level");
+
 	auto video = p->PageSizer(_("Default Video Script"));
 
 	auto vhint = new wxStaticText(p, wxID_ANY, _("This script will be executed to load video files that aren't\nVapourSynth scripts (i.e. end in .py or .vpy).\nThe filename variable stores the path to the file."));

src/vapoursynth_common.cpp

@@ -20,6 +20,7 @@
 #include "vapoursynth_wrap.h"
 #include "options.h"
 #include "utils.h"
+#include <libaegisub/background_runner.h>
 #include <libaegisub/fs.h>
 #include <libaegisub/path.h>
 
@@ -60,6 +61,28 @@ int OpenScriptOrVideo(const VSAPI *api, const VSSCRIPTAPI *sapi, VSScript *scrip
 	return result;
 }
 
+void VSLogToProgressSink(int msgType, const char *msg, void *userData) {
+	int loglevel = 0;
+	std::string loglevel_str = OPT_GET("Provider/Video/VapourSynth/Log Level")->GetString();
+	if (loglevel_str == "Quiet")
+		loglevel = 5;
+	else if (loglevel_str == "Fatal")
+		loglevel = 4;
+	else if (loglevel_str == "Critical")
+		loglevel = 3;
+	else if (loglevel_str == "Warning")
+		loglevel = 2;
+	else if (loglevel_str == "Information")
+		loglevel = 1;
+	else if (loglevel_str == "Debug")
+		loglevel = 0;
+
+	if (msgType < loglevel)
+		return;
+
+	reinterpret_cast<agi::ProgressSink *>(userData)->Log(msg);
+}
+
 void VSCleanCache() {
 	CleanCache(config::path->Decode("?local/vscache/"),
 		"",

src/vapoursynth_common.h

@@ -21,5 +21,6 @@
 
 int OpenScriptOrVideo(const VSAPI *api, const VSSCRIPTAPI *sapi, VSScript *script, agi::fs::path const& filename, std::string default_script);
 void VSCleanCache();
+void VSLogToProgressSink(int msgType, const char *msg, void *userData);
 
 #endif // WITH_VAPOURSYNTH

src/video_provider_vs.cpp

@@ -17,13 +17,17 @@
 #ifdef WITH_VAPOURSYNTH
 #include "include/aegisub/video_provider.h"
 
+#include "compat.h"
 #include "options.h"
 #include "video_frame.h"
 
 #include <libaegisub/access.h>
+#include <libaegisub/background_runner.h>
 #include <libaegisub/format.h>
-#include <libaegisub/path.h>
+#include <libaegisub/keyframe.h>
+#include <libaegisub/log.h>
 #include <libaegisub/make_unique.h>
+#include <libaegisub/path.h>
 
 #include <mutex>
 
@@ -33,6 +37,10 @@
 #include "VSHelper4.h"
 #include "VSConstants4.h"
 
+static const char *kf_key = "__aegi_keyframes";
+static const char *tc_key = "__aegi_timecodes";
+static const char *audio_key = "__aegi_hasaudio";
+
 namespace {
 class VapoursynthVideoProvider: public VideoProvider {
 	VapourSynthWrapper vs;
@@ -45,12 +53,13 @@ class VapoursynthVideoProvider: public VideoProvider {
 	std::vector<int> keyframes;
 	std::string colorspace;
 	std::string real_colorspace;
+	bool has_audio = false;
 
 	const VSFrame *GetVSFrame(int n);
-	void SetResizeArg(VSMap *args, const VSMap *props, const char *arg_name, const char *prop_name, int deflt, int unspecified = -1);
+	void SetResizeArg(VSMap *args, const VSMap *props, const char *arg_name, const char *prop_name, int64_t deflt, int64_t unspecified = -1);
 
 public:
-	VapoursynthVideoProvider(agi::fs::path const& filename, std::string const& colormatrix);
+	VapoursynthVideoProvider(agi::fs::path const& filename, std::string const& colormatrix, agi::BackgroundRunner *br);
 	~VapoursynthVideoProvider();
 
 	void GetFrame(int n, VideoFrame &frame) override;
@@ -65,7 +74,7 @@ public:
 	std::vector<int> GetKeyFrames() const override { return keyframes; }
 	std::string GetColorSpace() const override     { return GetRealColorSpace(); }
 	std::string GetRealColorSpace() const override { return colorspace == "Unknown" ? "None" : colorspace; }
-	bool HasAudio() const override                 { return false; }
+	bool HasAudio() const override                 { return has_audio; }
 	bool WantsCaching() const override             { return true; }
 	std::string GetDecoderName() const override    { return "VapourSynth"; }
 	bool ShouldSetVideoProperties() const override { return colorspace != "Unknown"; }
@@ -96,9 +105,9 @@ std::string colormatrix_description(int colorFamily, int colorRange, int matrix)
 }
 
 // Adds an argument to the rescaler if the corresponding frameprop does not exist or is set as unspecified
-void VapoursynthVideoProvider::SetResizeArg(VSMap *args, const VSMap *props, const char *arg_name, const char *prop_name, int deflt, int unspecified) {
+void VapoursynthVideoProvider::SetResizeArg(VSMap *args, const VSMap *props, const char *arg_name, const char *prop_name, int64_t deflt, int64_t unspecified) {
 	int err;
-	int result = vs.GetAPI()->mapGetInt(props, prop_name, 0, &err);
+	int64_t result = vs.GetAPI()->mapGetInt(props, prop_name, 0, &err);
 	if (err != 0 || result == unspecified) {
 		result = deflt;
 		if (!strcmp(arg_name, "range_in")) {
@@ -108,41 +117,52 @@ void VapoursynthVideoProvider::SetResizeArg(VSMap *args, const VSMap *props, con
 	}
 }
 
-VapoursynthVideoProvider::VapoursynthVideoProvider(agi::fs::path const& filename, std::string const& colormatrix) try {
+VapoursynthVideoProvider::VapoursynthVideoProvider(agi::fs::path const& filename, std::string const& colormatrix, agi::BackgroundRunner *br) try { try {
 	std::lock_guard<std::mutex> lock(vs.GetMutex());
 
 	VSCleanCache();
 
-	script = vs.GetScriptAPI()->createScript(nullptr);
+	int err1, err2;
+	VSCore *core = vs.GetAPI()->createCore(0);
+	if (core == nullptr) {
+		throw VapoursynthError("Error creating core");
+	}
+	script = vs.GetScriptAPI()->createScript(core);
 	if (script == nullptr) {
+		vs.GetAPI()->freeCore(core);
 		throw VapoursynthError("Error creating script API");
 	}
 	vs.GetScriptAPI()->evalSetWorkingDir(script, 1);
-	if (OpenScriptOrVideo(vs.GetAPI(), vs.GetScriptAPI(), script, filename, OPT_GET("Provider/Video/VapourSynth/Default Script")->GetString())) {
+	br->Run([&](agi::ProgressSink *ps) {
+		ps->SetTitle(from_wx(_("Executing Vapoursynth Script")));
+		ps->SetMessage("");
+		ps->SetIndeterminate();
+
+		VSLogHandle *logger = vs.GetAPI()->addLogHandler(VSLogToProgressSink, nullptr, ps, core);
+		err1 = OpenScriptOrVideo(vs.GetAPI(), vs.GetScriptAPI(), script, filename, OPT_GET("Provider/Video/VapourSynth/Default Script")->GetString());
+		vs.GetAPI()->removeLogHandler(logger, core);
+
+		ps->SetStayOpen(bool(err1));
+		if (err1)
+			ps->SetMessage(from_wx(_("Failed to execute script! Press \"Close\" to continue.")));
+	});
+	if (err1) {
 		std::string msg = agi::format("Error executing VapourSynth script: %s", vs.GetScriptAPI()->getError(script));
-		vs.GetScriptAPI()->freeScript(script);
 		throw VapoursynthError(msg);
 	}
 	node = vs.GetScriptAPI()->getOutputNode(script, 0);
-	if (node == nullptr) {
-		vs.GetScriptAPI()->freeScript(script);
+	if (node == nullptr)
 		throw VapoursynthError("No output node set");
-	}
+
 	if (vs.GetAPI()->getNodeType(node) != mtVideo) {
-		vs.GetAPI()->freeNode(node);
-		vs.GetScriptAPI()->freeScript(script);
 		throw VapoursynthError("Output node isn't a video node");
 	}
 	vi = vs.GetAPI()->getVideoInfo(node);
-	if (!vsh::isConstantVideoFormat(vi)) {
-		vs.GetAPI()->freeNode(node);
-		vs.GetScriptAPI()->freeScript(script);
+	if (vi == nullptr)
+		throw VapoursynthError("Couldn't get video info");
+	if (!vsh::isConstantVideoFormat(vi))
 		throw VapoursynthError("Video doesn't have constant format");
-	}
 
-	// Assume constant frame rate, since handling VFR would require going through all frames when loading.
-	// Users can load custom timecodes files to deal with VFR.
-	// Alternatively (TODO) the provider could read timecodes and keyframes from a second output node.
 	int fpsNum = vi->fpsNum;
 	int fpsDen = vi->fpsDen;
 	if (fpsDen == 0) {
@@ -151,25 +171,89 @@ VapoursynthVideoProvider::VapoursynthVideoProvider(agi::fs::path const& filename
 	}
 	fps = agi::vfr::Framerate(fpsNum, fpsDen);
 
-	// Find the first frame to get some info
-	const VSFrame *frame;
-	try {
-		frame = GetVSFrame(0);
-	} catch (VapoursynthError const& err) {
-		vs.GetAPI()->freeNode(node);
-		vs.GetScriptAPI()->freeScript(script);
-		throw err;
-	}
-	int err1, err2;
-	const VSMap *props = vs.GetAPI()->getFramePropertiesRO(frame);
-	int sarn = vs.GetAPI()->mapGetInt(props, "_SARNum", 0, &err1);
-	int sard = vs.GetAPI()->mapGetInt(props, "_SARDen", 0, &err2);
-	if (!err1 && !err2) {
-		dar = ((double) vi->width * sarn) / (vi->height * sard);
+	// Get timecodes and/or keyframes if provided
+	VSMap *clipinfo = vs.GetAPI()->createMap();
+	if (clipinfo == nullptr)
+		throw VapoursynthError("Couldn't create map");
+	vs.GetScriptAPI()->getVariable(script, kf_key, clipinfo);
+	vs.GetScriptAPI()->getVariable(script, tc_key, clipinfo);
+	vs.GetScriptAPI()->getVariable(script, audio_key, clipinfo);
+
+	int numkf = vs.GetAPI()->mapNumElements(clipinfo, kf_key);
+	int numtc = vs.GetAPI()->mapNumElements(clipinfo, tc_key);
+
+	int64_t audio = vs.GetAPI()->mapGetInt(clipinfo, audio_key, 0, &err1);
+	if (!err1)
+		has_audio = bool(audio);
+
+	if (numkf > 0) {
+		const int64_t *kfs = vs.GetAPI()->mapGetIntArray(clipinfo, kf_key, &err1);
+		const char *kfs_path = vs.GetAPI()->mapGetData(clipinfo, kf_key, 0, &err2);
+		if (err1 && err2)
+			throw VapoursynthError("Error getting keyframes from returned VSMap");
+
+		if (!err1) {
+			keyframes.reserve(numkf);
+			for (int i = 0; i < numkf; i++)
+				keyframes.push_back(int(kfs[i]));
+		} else {
+			int kfs_path_size = vs.GetAPI()->mapGetDataSize(clipinfo, kf_key, 0, &err1);
+			if (err1)
+				throw VapoursynthError("Error getting size of keyframes path");
+
+			try {
+				keyframes = agi::keyframe::Load(config::path->Decode(std::string(kfs_path, size_t(kfs_path_size))));
+			} catch (agi::Exception const& e) {
+				LOG_E("vapoursynth/video/keyframes") << "Failed to open keyframes file specified by script: " << e.GetMessage();
+			}
+		}
 	}
 
-	int range = vs.GetAPI()->mapGetInt(props, "_ColorRange", 0, &err1);
-	int matrix = vs.GetAPI()->mapGetInt(props, "_Matrix", 0, &err2);
+	if (numtc != -1) {
+		const int64_t *tcs = vs.GetAPI()->mapGetIntArray(clipinfo, tc_key, &err1);
+		const char *tcs_path = vs.GetAPI()->mapGetData(clipinfo, tc_key, 0, &err2);
+		if (err1 && err2)
+			throw VapoursynthError("Error getting timecodes from returned map");
+
+		if (!err1) {
+			if (numtc != vi->numFrames)
+				throw VapoursynthError("Number of returned timecodes does not match number of frames");
+
+			std::vector<int> timecodes;
+			timecodes.reserve(numtc);
+			for (int i = 0; i < numtc; i++)
+				timecodes.push_back(int(tcs[i]));
+
+			fps = agi::vfr::Framerate(timecodes);
+		} else {
+			int tcs_path_size = vs.GetAPI()->mapGetDataSize(clipinfo, tc_key, 0, &err1);
+			if (err1)
+				throw VapoursynthError("Error getting size of keyframes path");
+
+			try {
+				fps = agi::vfr::Framerate(config::path->Decode(std::string(tcs_path, size_t(tcs_path_size))));
+			} catch (agi::Exception const& e) {
+				// Throw an error here unlike with keyframes since the timecodes not being loaded might not be immediately noticeable
+				throw VapoursynthError("Failed to open timecodes file specified by script: " + e.GetMessage());
+			}
+		}
+	}
+	vs.GetAPI()->freeMap(clipinfo);
+
+	// Find the first frame Of the video to get some info
+	const VSFrame *frame = GetVSFrame(0);
+
+	const VSMap *props = vs.GetAPI()->getFramePropertiesRO(frame);
+	if (props == nullptr)
+		throw VapoursynthError("Couldn't get frame properties");
+	int64_t sarn = vs.GetAPI()->mapGetInt(props, "_SARNum", 0, &err1);
+	int64_t sard = vs.GetAPI()->mapGetInt(props, "_SARDen", 0, &err2);
+	if (!err1 && !err2) {
+		dar = double(vi->width * sarn) / (vi->height * sard);
+	}
+
+	int64_t range = vs.GetAPI()->mapGetInt(props, "_ColorRange", 0, &err1);
+	int64_t matrix = vs.GetAPI()->mapGetInt(props, "_Matrix", 0, &err2);
 	colorspace = colormatrix_description(vi->format.colorFamily, err1 == 0 ? range : -1, err2 == 0 ? matrix : -1);
 
 	vs.GetAPI()->freeFrame(frame);
@@ -177,13 +261,12 @@ VapoursynthVideoProvider::VapoursynthVideoProvider(agi::fs::path const& filename
 	if (vi->format.colorFamily != cfRGB || vi->format.bitsPerSample != 8) {
 		// Convert to RGB24 format
 		VSPlugin *resize = vs.GetAPI()->getPluginByID(VSH_RESIZE_PLUGIN_ID, vs.GetScriptAPI()->getCore(script));
-		if (resize == nullptr) {
+		if (resize == nullptr)
 			throw VapoursynthError("Couldn't find resize plugin");
-		}
+
 		VSMap *args = vs.GetAPI()->createMap();
-		if (args == nullptr) {
+		if (args == nullptr)
 			throw VapoursynthError("Failed to create argument map");
-		}
 
 		vs.GetAPI()->mapSetNode(args, "clip", node, maAppend);
 		vs.GetAPI()->mapSetInt(args, "format", pfRGB24, maAppend);
@@ -213,18 +296,18 @@ VapoursynthVideoProvider::VapoursynthVideoProvider(agi::fs::path const& filename
 		}
 
 		// Finally, try to get the first frame again, so if the filter does crash, it happens before loading finishes
-		const VSFrame *rgbframe;
-		try {
-			rgbframe = GetVSFrame(0);
-		} catch (VapoursynthError const& err) {
-			vs.GetAPI()->freeNode(node);
-			vs.GetScriptAPI()->freeScript(script);
-			throw err;
-		}
+		const VSFrame *rgbframe = GetVSFrame(0);
 		vs.GetAPI()->freeFrame(rgbframe);
 	}
+} catch (VapoursynthError const& err) {     // for try inside of function. We need both here since we need to catch errors from the VapoursynthWrap constructor.
+	if (node != nullptr)
+		vs.GetAPI()->freeNode(node);
+	if (script != nullptr)
+		vs.GetScriptAPI()->freeScript(script);
+	throw err;
 }
-catch (VapoursynthError const& err) {
+}
+catch (VapoursynthError const& err) {    // for the entire constructor
 	throw VideoProviderError(agi::format("Vapoursynth error: %s", err.GetMessage()));
 }
 
@@ -287,8 +370,7 @@ VapoursynthVideoProvider::~VapoursynthVideoProvider() {
 }
 
 namespace agi { class BackgroundRunner; }
-std::unique_ptr<VideoProvider> CreateVapoursynthVideoProvider(agi::fs::path const& path, std::string const& colormatrix, agi::BackgroundRunner *) {
-	agi::acs::CheckFileRead(path);
-	return agi::make_unique<VapoursynthVideoProvider>(path, colormatrix);
+std::unique_ptr<VideoProvider> CreateVapoursynthVideoProvider(agi::fs::path const& path, std::string const& colormatrix, agi::BackgroundRunner *br) {
+	return agi::make_unique<VapoursynthVideoProvider>(path, colormatrix, br);
 }
 #endif // WITH_VAPOURSYNTH