add new function to determine fps value

openpype/lib/__init__.py

@@ -115,6 +115,7 @@ from .transcoding import (
     get_ffmpeg_codec_args,
     get_ffmpeg_format_args,
     convert_ffprobe_fps_value,
+    convert_ffprobe_fps_to_float,
 )
 from .avalon_context import (
     CURRENT_DOC_SCHEMAS,
@@ -287,6 +288,7 @@ __all__ = [
     "get_ffmpeg_codec_args",
     "get_ffmpeg_format_args",
     "convert_ffprobe_fps_value",
+    "convert_ffprobe_fps_to_float",
 
     "CURRENT_DOC_SCHEMAS",
     "PROJECT_NAME_ALLOWED_SYMBOLS",

openpype/lib/transcoding.py

@@ -938,3 +938,40 @@ def convert_ffprobe_fps_value(str_value):
         fps = int(fps)
 
     return str(fps)
+
+
+def convert_ffprobe_fps_to_float(value):
+    """Convert string value of frame rate to float.
+
+    Copy of 'convert_ffprobe_fps_value' which raises exceptions on invalid
+    value, does not convert value to string and does not return "Unknown"
+    string.
+
+    Args:
+        value (str): Value to be converted.
+
+    Returns:
+        Float: Converted frame rate in float. If divisor in value is '0' then
+            '0.0' is returned.
+
+    Raises:
+        ValueError: Passed value is invalid for conversion.
+    """
+
+    if not value:
+        raise ValueError("Got empty value.")
+
+    items = value.split("/")
+    if len(items) == 1:
+        return float(items[0])
+
+    if len(items) > 2:
+        raise ValueError((
+            "FPS expression contains multiple dividers \"{}\"."
+        ).format(value))
+
+    dividend = float(items.pop(0))
+    divisor = float(items.pop(0))
+    if divisor == 0.0:
+        return 0.0
+    return dividend / divisor