updates (#91)

* add a fallback font for Debian-based systems

dejavu fonts are stored in a different location on Debian/Ubuntu

https://packages.debian.org/buster/all/fonts-dejavu-core/filelist

* add {{video_bit_rate}} parameter (fixes #90)

* use BMP instead of PNG for faster captures

this is larger than PNG, but there's no time wasted compressing the temporary file and it's unlikely that the few extra megabytes of disk space matters

vcsi/vcsi.py → vcsi/m

@@ -72,7 +72,7 @@ def __str__(self):
 # Defaults
 DEFAULT_METADATA_FONT = "/usr/share/fonts/TTF/DejaVuSans-Bold.ttf"
 DEFAULT_TIMESTAMP_FONT = "/usr/share/fonts/TTF/DejaVuSans.ttf"
-FALLBACK_FONTS = ["/Library/Fonts/Arial Unicode.ttf"]
+FALLBACK_FONTS = ["/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf", "/Library/Fonts/Arial Unicode.ttf"]
 
 # Replace defaults on Windows to support unicode/CJK and multiple fallbacks
 if os.name == 'nt':
@@ -399,6 +399,11 @@ def parse_attributes(self):
         except KeyError:
             self.video_codec_long = None
 
+        try:
+            self.video_bit_rate = int(self.video_stream["bit_rate"])
+        except KeyError:
+            self.video_bit_rate = None
+
         try:
             self.sample_aspect_ratio = self.video_stream["sample_aspect_ratio"]
         except KeyError:
@@ -466,6 +471,7 @@ def list_template_attributes():
         table.append({"name": "video_codec", "description": "Video codec", "example": "h264"})
         table.append({"name": "video_codec_long", "description": "Video codec (long name)",
                       "example": "H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10"})
+        table.append({"name": "video_bit_rate", "description": "Video bitrate", "example": "4000"})
         table.append({"name": "display_aspect_ratio", "description": "Display aspect ratio", "example": "16:9"})
         table.append({"name": "sample_aspect_ratio", "description": "Sample aspect ratio", "example": "1:1"})
         table.append({"name": "audio_codec", "description": "Audio codec", "example": "aac"})
@@ -728,7 +734,7 @@ def do_capture(ts_tuple, width, height, suffix, args):
         for i, timestamp_tuple in enumerate(timestamps):
             status = "Sampling... {}/{}".format(i + 1, args.num_samples)
             print(status, end="\r")
-            suffix = ".png"  # arguably higher image quality
+            suffix = ".bmp"  # lossless
             frame = do_capture(timestamp_tuple, desired_size[0], desired_size[1], suffix, args)
 
             blurs += [