GH-15: Collect the dependencies into the requirements.txt (GH-22)

* Fix the time format at VTT for floating intervals
* Specify the dependencies in the requirements.txt
* Remove `numpy` from dependencies

Author: ArtyomVancyan

requirements.txt

@@ -0,0 +1,3 @@
+imageio-ffmpeg>=0.4.7
+imageio>=2.23.0
+pillow>=8.4.0

thumbnails.py

@@ -4,7 +4,7 @@
 
 # Read from the program arguments.
 compress = 1
-interval = 20
+interval = .5
 basepath = "/stc/"
 
 files = ["valerian-1080p.avi", "valerian-1080p.mkv", "valerian-1080p.mov", "valerian-1080p.mp4",

thumbnails/thumbnails.py

@@ -8,13 +8,22 @@
 
 from PIL import Image
 from imageio_ffmpeg import get_ffmpeg_exe
-from numpy import arange
 
 from .ffmpeg import _FFMpeg
 
 ffmpeg_bin = get_ffmpeg_exe()
 
 
+def arange(start, stop, step):
+    def _generator():
+        nonlocal start
+        while start < stop:
+            yield start
+            start += step
+
+    return tuple(_generator())
+
+
 class _ThumbnailMixin:
     def __init__(self, size):
         self._w = None
@@ -99,7 +108,7 @@ def _calc_columns(frames_count, width, height):
 
     def _extract_frame(self, start_time):
         _input_file = self.filename
-        _output_file = "%s/%d-%s.png" % (self.tempdir.name, start_time, self.filename)
+        _output_file = "%s/%s-%s.png" % (self.tempdir.name, start_time, self.filename)
         _timestamp = str(timedelta(seconds=start_time))
 
         cmd = (
@@ -124,7 +133,7 @@ def join_frames(self):
         frames = sorted(glob.glob(self.tempdir.name + os.sep + "*.png"))
         frames_count = len(arange(0, self.duration, self.interval))
         columns = self._calc_columns(frames_count, self.width, self.height)
-        master_height = self.height * int(math.ceil(float(frames_count) / columns))
+        master_height = self.height * math.ceil(frames_count / columns)
         master = Image.new(mode="RGBA", size=(self.width * columns, master_height))
 
         for n, frame in enumerate(frames):
@@ -148,8 +157,9 @@ def join_frames(self):
         self.tempdir.cleanup()
 
     def to_vtt(self):
-        def _format_time(seconds):
-            return "0%s.000" % str(timedelta(seconds=seconds))
+        def _format_time(secs):
+            delta = timedelta(seconds=secs)
+            return ("0%s.000" % delta)[:12]
 
         _lines = ["WEBVTT\n\n"]
         _img_src = self.basepath + self._image_name