trying (and failing?) to get hw acceleration

Pipfile

@@ -5,6 +5,7 @@ name = "pypi"
 
 [packages]
 opencv-python = "*"
+wakepy = "*"
 
 [dev-packages]
 

Pipfile.lock

@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "9cd65918174126dae7310623cabe06ec6e5ce3f1bb0e255262749a78a55d3839"
+            "sha256": "943975627c31fb661a3a1e3a77e80b2e5634baf439d615ccba41a14d7edf09b1"
         },
         "pipfile-spec": 6,
         "requires": {
@@ -80,6 +80,15 @@
             "index": "pypi",
             "markers": "python_version >= '3.6'",
             "version": "==4.10.0.84"
+        },
+        "wakepy": {
+            "hashes": [
+                "sha256:4e7e820512e0e69f9aa5fdded2d3225e6f7c9f000814300e8c37d1fa88fe1664",
+                "sha256:fee0722b554a859724f6f47ec28db1d513f15097f235b09ebb1b58f545f90db2"
+            ],
+            "index": "pypi",
+            "markers": "python_version >= '3.7'",
+            "version": "==0.9.1"
         }
     },
     "develop": {}

webcam.py

@@ -1,86 +1,107 @@
 from datetime import datetime, date, time, timedelta
 import os
 import cv2
+from wakepy import keep
 
 def five_minute_segment_from(the_time):
-    return the_time.replace(minute=(the_time.minute // 1)*1, second=0, microsecond=0)
+    # this is mocked out too be a one minute segment instead
+    return the_time.replace(second=0, microsecond=0)
+    #return the_time.replace(minute=(the_time.minute // 1)*1, second=0, microsecond=0)
+
 
 def path_to_video_at(time_stamp):
-    return 'videos/' + str(time_stamp) + '.mkv'
+    return 'videos/' + str(time_stamp) + '.mkv' # mkv required for h264 encoding
+
+os.environ["OPENCV_FFMPEG_CAPTURE_OPTIONS"]="hwaccel;vaapi;hw_decoders_any;vaapi,vdpau" # maybe this enables hardware accelerated ffmpeg? 
 
 #delay for long delay
-long_delay = timedelta(hours=1)
+long_delay = timedelta(minutes=1)
 
-
-queue = [(False, None)] * 100 #queue of recent frames
 last_time_stamp = five_minute_segment_from(datetime.now()) 
   
 # live webcam feed
-camera = cv2.VideoCapture(0) 
+camera = cv2.VideoCapture(0, cv2.CAP_FFMPEG) 
 if not camera.isOpened():
     print("Cannot open camera")
     exit()
 
 # video writer
 fourcc = cv2.VideoWriter_fourcc(*'H264')
-out = cv2.VideoWriter(path_to_video_at(last_time_stamp), fourcc, camera.get(cv2.CAP_PROP_FPS), (int(camera.get(3)),int(camera.get(4))))
+video_writer = cv2.VideoWriter(path_to_video_at(last_time_stamp), 
+    fourcc, 
+    camera.get(cv2.CAP_PROP_FPS), 
+    (int(camera.get(3)),int(camera.get(4))), 
+    (cv2.VIDEOWRITER_PROP_HW_ACCELERATION, cv2.VIDEO_ACCELERATION_ANY)
+    )
 
 # video feed from previously captured video
-old_time = cv2.VideoCapture(path_to_video_at(last_time_stamp))
+old_time = cv2.VideoCapture(path_to_video_at(last_time_stamp), cv2.CAP_FFMPEG)
 
+# fullscreen window yess good
 cv2.namedWindow("mirror", cv2.WINDOW_NORMAL)
 cv2.setWindowProperty("mirror", cv2.WND_PROP_FULLSCREEN, cv2.WINDOW_FULLSCREEN)
 
-idx = 0 
+queue = [(False, None)] * 100 #queue of recent frames
-offset = 0
+idx = 0 # current index into the frame queue
-longterm = False
+short_term_delay_frames = 20 # hoow many frames back are we going in the buffer when we're on a short term delay?
-while(True): 
+longterm = False # are we shoowing a long term delay? (versus a sshort term delay)
-    if last_time_stamp != five_minute_segment_from(datetime.now()):
-        # find file older than our long delay
-        old_file = path_to_video_at(five_minute_segment_from(datetime.now() - long_delay - timedelta(minutes=5)))
-        print(f"deleting old file {old_file}")
-        os.remove(old_file)
 
-        out.release()
+with keep.presenting():
-        out = cv2.VideoWriter(path_to_video_at(last_time_stamp), 
+    while(True): 
-            fourcc, 
+        if last_time_stamp != five_minute_segment_from(datetime.now()):
-            camera.get(cv2.CAP_PROP_FPS), 
+            # find file older than our long delay
-            (int(camera.get(3)), int(camera.get(4)))
+            old_file = path_to_video_at(five_minute_segment_from(datetime.now() - long_delay - timedelta(minutes=1)))
-            )
+            if os.path.isfile(old_file):
-        if old_time.isOpened():
+                print(f"deleting old file {old_file}")
-            old_time.release()
+                os.remove(old_file)
 
-        new_file = path_to_video_at(five_minute_segment_from(datetime.now() - timedelta(minutes=10)))
+            video_writer.release()
-        pint(f"opening the previously recorded file {new_file} to read from for long mirror")
+            newly_recording_file = path_to_video_at(five_minute_segment_from(datetime.now()))
-        old_time = cv2.VideoCapture(new_file)
             
-    last_time_stamp = five_minute_segment_from(datetime.now())
+            print(f"opening {newly_recording_file} too record this upcoming ssegment to")
+            video_writer = cv2.VideoWriter(newly_recording_file, 
+                fourcc, 
+                camera.get(cv2.CAP_PROP_FPS), 
+                (int(camera.get(3)), int(camera.get(4))),
+                (cv2.VIDEOWRITER_PROP_HW_ACCELERATION, cv2.VIDEO_ACCELERATION_ANY)
+                )
 
-    ret, frame = camera.read() 
-    frame = cv2.flip(frame, 1)
 
-    # record the frame to the appropriate file, and also to the short term buffer
+            if old_time.isOpened():
-    out.write(frame)
+                old_time.release()
-    queue[idx] = ret, frame
 
-    prev_frame_valid, prev_frame = queue[(idx - offset) % len(queue)]
+            new_file = path_to_video_at(five_minute_segment_from(datetime.now() - long_delay))
-    old_frame_valid, old_frame = old_time.read()
+            print(f"opening the previously recorded file {new_file} to read from for long mirror")
-    if not longterm and prev_frame_valid:
+            old_time = cv2.VideoCapture(new_file, cv2.CAP_FFMPEG)
-        cv2.imshow('mirror', prev_frame)
-    elif longterm and old_frame_valid:
-        cv2.imshow('mirror', old_frame)
 
-    key = cv2.waitKey(16) # listen for keyprress for some number of ms
-    if key & 0xFF == ord('q') or key == 27: # q or esc 
-        break
-    if key & 0xFF == ord('a'):
-        offset += 1
-    if key & 0xFF == ord('d'):
-        offset -= 1
-    if key & 0xFF == ord('z'):
-        longterm = not longterm
 
-    idx = (idx + 1) % len(queue)
+        last_time_stamp = five_minute_segment_from(datetime.now())
+
+        ret, frame = camera.read() 
+        frame = cv2.flip(frame, 1)
+
+        # record the frame to the appropriate file, and also to the short term buffer
+        video_writer.write(frame)
+        queue[idx] = ret, frame
+
+        prev_frame_valid, prev_frame = queue[(idx - short_term_delay_frames) % len(queue)]
+        old_frame_valid, old_frame = old_time.read()
+        if not longterm and prev_frame_valid:
+            cv2.imshow('mirror', prev_frame)
+        elif longterm and old_frame_valid:
+            cv2.imshow('mirror', old_frame)
+
+        key = cv2.waitKey(16) # listen for keyprress for 16 ms
+        if key & 0xFF == ord('q') or key == 27: # q or esc 
+            break
+        if key & 0xFF == ord('a'):
+            short_term_delay_frames += 1
+        if key & 0xFF == ord('d'):
+            short_term_delay_frames -= 1
+        if key & 0xFF == ord('z'):
+            longterm = not longterm
+
+        idx = (idx + 1) % len(queue)
   
 # After the loop release the cap object 
 camera.release()