Support progress when encoding audio

Author: jonghwanhyeon

ffmpeg/statistics.py

@@ -35,7 +35,11 @@ class Statistics:
     @classmethod
     def from_line(cls, line: str) -> Optional[Self]:
         statistics = {key: value for key, value in _pattern.findall(line)}
-        if len(statistics) != len(_field_factory):
+        if len(statistics) < 4:
+            # When a media type is audio,FFmpeg reports the below statistics
+            # - size, time, bitrate, speed
+            # When a media type is video, FFmpeg reports the below statistics
+            # - frame, fps, size, time, bitrate, speed
             return None
 
         fields = {key: _field_factory[key](value) for key, value in statistics.items() if value != "N/A"}

tests/test_statistics.py

@@ -4,6 +4,17 @@
 
 
 def test_statistics():
+    assert Statistics.from_line(
+        "size=     243kB time=00:01:01.47 bitrate=  32.4kbits/s speed= 123x",
+    ) == Statistics(
+        frame=0,
+        fps=0.0,
+        size=243 * 1024,
+        time=timedelta(minutes=1, seconds=1, microseconds=470000),
+        bitrate=32.4,
+        speed=123,
+    )
+
     assert Statistics.from_line(
         "frame=    0 fps=0.0 q=0.0 size=       0kB time=00:00:00.33 bitrate=   1.1kbits/s speed=22.8x",
     ) == Statistics(