check fps with ffprobe

Cameras/test_scripts/file_explore.py

@@ -1,3 +1,4 @@
+import subprocess
 import cv2
 
 from pathlib import Path
@@ -14,10 +15,57 @@ def print_video_info(videos_path: Path):
         print(f"starting datetime: {starting_datetime}")
         cap = cv2.VideoCapture(str(video_path))
         print(f"frame count: {cap.get(cv2.CAP_PROP_FRAME_COUNT)}")
-        print(f"fps: {cap.get(cv2.CAP_PROP_FPS)}")
+        print(f"reported fps: {cap.get(cv2.CAP_PROP_FPS)}")
+        ffprobe_fps = get_ffprobe_fps(
+            video_path
+        )
+        print(f"ffprobe fps: {ffprobe_fps}")
         cap.release()
 
 
+def get_ffprobe_fps(video_path: Path) -> float:
+    duration_subprocess = subprocess.run(
+        [
+            "ffprobe",
+            "-v",
+            "error",
+            "-show_entries",
+            "format=duration",
+            "-of",
+            "default=noprint_wrappers=1:nokey=1",
+            f"{video_path}",
+        ],
+        stdout=subprocess.PIPE,
+        stderr=subprocess.STDOUT,
+    )
+    duration = duration_subprocess.stdout
+    print(f"duration from ffprobe: {float(duration)} seconds")
+
+    frame_count_subprocess = subprocess.run(
+        [
+            "ffprobe",
+            "-v",
+            "error",
+            "-select_streams",
+            "v:0",
+            "-count_frames",
+            "-show_entries",
+            "stream=nb_read_frames",
+            "-of",
+            "csv=p=0",
+            f"{video_path}",
+        ],
+        stdout=subprocess.PIPE,
+        stderr=subprocess.STDOUT,
+    )
+
+    frame_count = int(frame_count_subprocess.stdout)
+
+    print(f"frame count from ffprobe: {frame_count}")
+
+    return frame_count / float(duration)
+
+
 if __name__ == "__main__":
     # folder_path = Path(
     #     "/Users/philipqueen/Documents/Humon Research Lab/Basler Stuff/calibration_attempt/"