Add ass2mks

ass2mks.py

@@ -0,0 +1,115 @@
+#!/usr/bin/env python3
+from subprocess import run
+import mimetypes
+import os.path
+import re
+import sys
+
+
+def lavfi_escape(parameter):
+    return (
+        parameter.replace("'", "\\'")
+        .replace(":", "\:")
+        .replace("\\'", "\\\\\\'")
+        .replace("[", "\[")
+        .replace("]", "\]")
+        .replace(",", "\,")
+    )
+
+
+infile = sys.argv[1]
+try:
+    timeout = sys.argv[2]
+except IndexError:
+    timeout = 1800
+# the system default font
+# if the font name does not include this but the resulting fqn does, it is treated as missing
+default_font = "Roboto"
+
+res = run(
+    [
+        "ffmpeg",
+        "-hide_banner",
+        "-t",
+        str(timeout),
+        "-f",
+        "lavfi",
+        "-i",
+        "nullsrc=16x16",
+        "-filter:v",
+        f"subtitles={lavfi_escape(infile)}",
+        "-f",
+        "null",
+        "-",
+    ],
+    capture_output=True,
+)
+
+if res.returncode != 0:
+    print("ffmpeg failed")
+    print(f"stdout: {res.stdout.decode('utf-8')}")
+    print(f"stderr: {res.stderr.decode('utf-8')}")
+    sys.exit(1)
+
+if res.stdout != b"":
+    print(f"Got Stdout: {res.stdout.decode('utf-8')}")
+
+substitutions = []
+fonts = []
+
+for line in res.stderr.decode("utf-8").splitlines():
+    substitution = re.match(
+        "^\[Parsed_subtitles_0 @ 0x[0-9a-f]{12}\] Glyph .* not found, selecting one more font for \((.*), ([0-9]{1,3}), ([0-9]{1,3})\)",
+        line,
+    )
+    fontselect = re.match(
+        "^\[Parsed_subtitles_0 @ 0x[0-9a-f]{12}\] fontselect: \((.*), ([0-9]{1,3}), ([0-9]{1,3})\) -> (.*), ([0-9]*), (.*)",
+        line,
+    )
+    if substitution is not None:
+        substitutions.append(
+            (
+                substitution.group(1),
+                int(substitution.group(2)),
+                int(substitution.group(3)),
+            )
+        )
+    if fontselect is not None:
+        font = {
+            "name": fontselect.group(1),
+            "weight": int(fontselect.group(2)),
+            "italic": int(fontselect.group(3)),
+            "path": fontselect.group(4),
+            #'?': fontselect.group(5),
+            "fqn": fontselect.group(6),
+        }
+        if font["name"] == "":
+            continue
+
+        if (font["name"], font["weight"], font["italic"]) in substitutions:
+            print(
+                f"Font {font['name']} lacks glyph support which lead to the substitution by {font['fqn']}, not including substitution font"
+            )
+            continue
+
+        if default_font in font["fqn"] and not default_font in font["name"]:
+            print(
+                f"Font {font['name']} could not be found (based on {font['fqn']} looking like the default font)"
+            )
+            sys.exit(1)
+
+        fonts.append(font)
+
+command = ["mkvmerge", "-q", "-o", f"{os.path.splitext(infile)[0]}.mks", infile]
+
+for font in fonts:
+    command.extend(
+        [
+            "--attachment-mime-type",
+            mimetypes.guess_type(font["path"])[0],
+            "--attach-file",
+            font["path"],
+        ]
+    )
+
+run(command, check=True)