From 605a1bd4e6ba77ae0231b52b6085699d506e749a Mon Sep 17 00:00:00 2001
From: Diego Pino Garcia <dpino@igalia.com>
Date: Tue, 19 Jun 2018 21:01:16 +0200
Subject: [PATCH 1/2] Play video from file tutorial

---
 .gitignore           |  1 +
 opencv/README.md     |  5 +++++
 opencv/play-video.py | 38 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 44 insertions(+)
 create mode 100644 .gitignore
 create mode 100755 opencv/play-video.py

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..b9d28aa
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+opencv/data
diff --git a/opencv/README.md b/opencv/README.md
index 9369510..0be5b56 100644
--- a/opencv/README.md
+++ b/opencv/README.md
@@ -9,3 +9,8 @@ Sources:
 * [Getting Started with Videos][Getting Started with Videos].
 
 [Getting Started with Videos]: http://opencv-python-tutroals.readthedocs.io/en/latest/py_tutorials/py_gui/py_video_display/py_video_display.html
+
+## Examples
+
+* capture-video-gray.py: Capture video and apply gray filter.
+* play-video.py: Read video from file.
diff --git a/opencv/play-video.py b/opencv/play-video.py
new file mode 100755
index 0000000..a8ad3f0
--- /dev/null
+++ b/opencv/play-video.py
@@ -0,0 +1,38 @@
+#!/usr/bin/env python
+
+import numpy as np
+import cv2
+import os
+import tempfile
+
+def screenshot(img):
+    dirname = tempfile._get_default_tempdir()
+    filename = next(tempfile._get_candidate_names()) + '.png'
+    filename = dirname + '/' + filename
+    print('Screenshot %s' % filename)
+    cv2.imwrite(filename, img)
+
+# URL: https://www.youtube.com/watch?v=qRLbzpy1y8Y
+video = 'data/spain-vs-germany-2008.mp4'
+cap = cv2.VideoCapture(video)
+
+while (True):
+    # Capture frame-by-frame.
+    success, frame = cap.read()
+
+    # Our operations on the frame come here. 
+    frame = cv2.resize(frame, (640, 480))
+
+    # Display the resulting frame.
+    cv2.imshow('frame', frame)
+
+    # Actions.
+    key = cv2.waitKey(1) & 0xFF
+    if key == ord('q'):
+        break
+    elif key == ord('s'):
+        screenshot(frame)
+
+# When everything done, release the capture.
+cap.release()
+cv2.destroyAllWindows()

From bf4f0ca949cc30af13d5e5395bf420d013a7516d Mon Sep 17 00:00:00 2001
From: Diego Pino Garcia <dpino@igalia.com>
Date: Tue, 26 Jun 2018 19:32:05 +0200
Subject: [PATCH 2/2] Download video if it doesn't exist

---
 opencv/play-video.py | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/opencv/play-video.py b/opencv/play-video.py
index a8ad3f0..75b26aa 100755
--- a/opencv/play-video.py
+++ b/opencv/play-video.py
@@ -4,6 +4,7 @@
 import cv2
 import os
 import tempfile
+from subprocess import call
 
 def screenshot(img):
     dirname = tempfile._get_default_tempdir()
@@ -12,8 +13,17 @@ def screenshot(img):
     print('Screenshot %s' % filename)
     cv2.imwrite(filename, img)
 
-# URL: https://www.youtube.com/watch?v=qRLbzpy1y8Y
+def download(url, path):
+    print("Downloading video: %s" % url)
+    if not os.path.exists(os.path.dirname(video)):
+        os.mkdir(os.path.dirname(video))
+    call(["youtube-dl", url, "-o", video])
+    print("Video saved: %s" % video)
+
 video = 'data/spain-vs-germany-2008.mp4'
+if not os.path.exists(video):
+    url = "https://www.youtube.com/watch?v=qRLbzpy1y8Y"
+    download(url, video)
 cap = cv2.VideoCapture(video)
 
 while (True):