|
1
|
|
|
""" |
|
2
|
|
|
ffmpeg_streaming.media |
|
3
|
|
|
~~~~~~~~~~~~ |
|
4
|
|
|
|
|
5
|
|
|
Size and Bitrate Objects |
|
6
|
|
|
|
|
7
|
|
|
|
|
8
|
|
|
:copyright: (c) 2020 by Amin Yazdanpanah. |
|
9
|
|
|
:website: https://www.aminyazdanpanah.com |
|
10
|
|
|
:email: [email protected] |
|
11
|
|
|
:license: MIT, see LICENSE for more details. |
|
12
|
|
|
""" |
|
13
|
|
|
import math |
|
14
|
|
|
|
|
15
|
|
|
OVERALL_TO_VIDEO_COEFFICIENT = .8 |
|
16
|
|
|
MAX_RATE_COEFFICIENT = 1.2 |
|
17
|
|
|
|
|
18
|
|
|
|
|
19
|
|
|
def cnv_bitrate(bitrate: int, _type: str) -> str: |
|
20
|
|
|
if _type == "k": |
|
21
|
|
|
bitrate = round(bitrate / 1024) |
|
22
|
|
|
elif _type == "m": |
|
23
|
|
|
bitrate = round(bitrate / 1024 * 1024) |
|
24
|
|
|
else: |
|
25
|
|
|
raise ValueError("Unknown type!") |
|
26
|
|
|
|
|
27
|
|
|
return str(bitrate) + _type |
|
28
|
|
|
|
|
29
|
|
|
|
|
30
|
|
|
class Bitrate: |
|
31
|
|
|
def __init__(self, video: int = None, audio: int = None, overall: int = None, **kwargs): |
|
32
|
|
|
if video is None and overall is None: |
|
33
|
|
|
raise ValueError("You must at least specify value of the video or overall format") |
|
34
|
|
|
self.overall_ = overall |
|
35
|
|
|
self.video_ = video |
|
36
|
|
|
self.audio_ = audio |
|
37
|
|
|
self.type = kwargs.pop("type", "k") |
|
38
|
|
|
|
|
39
|
|
|
@property |
|
40
|
|
|
def overall(self): |
|
41
|
|
|
return cnv_bitrate(self.overall_, self.type) if self.overall_ is not None else None |
|
42
|
|
|
|
|
43
|
|
|
@property |
|
44
|
|
|
def video(self): |
|
45
|
|
|
return cnv_bitrate(self.video_, self.type) if self.video_ is not None else None |
|
46
|
|
|
|
|
47
|
|
|
@property |
|
48
|
|
|
def audio(self): |
|
49
|
|
|
return cnv_bitrate(self.audio_, self.type) if self.audio_ is not None else 'copy' |
|
50
|
|
|
|
|
51
|
|
|
def normalize_video(self, convert: bool = True): |
|
52
|
|
|
if self.video_ is not None and self.video_ != 0: |
|
53
|
|
|
val = self.video_ |
|
54
|
|
|
else: |
|
55
|
|
|
val = int(self.overall_ * OVERALL_TO_VIDEO_COEFFICIENT) |
|
56
|
|
|
|
|
57
|
|
|
return cnv_bitrate(val, self.type) if convert else val |
|
58
|
|
|
|
|
59
|
|
|
@property |
|
60
|
|
|
def max_rate(self): |
|
61
|
|
|
return cnv_bitrate(int(self.normalize_video(False) * MAX_RATE_COEFFICIENT), self.type) |
|
62
|
|
|
|
|
63
|
|
|
|
|
64
|
|
|
def multiple_up(value, multiple): |
|
65
|
|
|
while 0 != value % multiple: |
|
66
|
|
|
value += 1 |
|
67
|
|
|
|
|
68
|
|
|
return value |
|
69
|
|
|
|
|
70
|
|
|
|
|
71
|
|
|
def multiple_down(value, multiple): |
|
72
|
|
|
while 0 != value % multiple: |
|
73
|
|
|
value -= 1 |
|
74
|
|
|
|
|
75
|
|
|
return value |
|
76
|
|
|
|
|
77
|
|
|
|
|
78
|
|
|
class Ratio: |
|
79
|
|
|
def __init__(self, width: int, height: int): |
|
80
|
|
|
self.width = width |
|
81
|
|
|
self.height = height |
|
82
|
|
|
|
|
83
|
|
|
def get_value(self) -> float: |
|
84
|
|
|
return self.width / self.height |
|
85
|
|
|
|
|
86
|
|
|
def calculate_width(self, height: int, multiple: int = 1) -> int: |
|
87
|
|
|
max_w = multiple_up(math.ceil(self.get_value() * height), multiple) |
|
88
|
|
|
min_w = multiple_down(math.floor(self.get_value() * height), multiple) |
|
89
|
|
|
|
|
90
|
|
|
max_r = abs(self.get_value() - (max_w / height)) |
|
91
|
|
|
min_r = abs(self.get_value() - (min_w / height)) |
|
92
|
|
|
|
|
93
|
|
|
return max_w if max_r < min_r else min_w |
|
94
|
|
|
|
|
95
|
|
|
def calculate_height(self, width: int, multiple: int = 1) -> int: |
|
96
|
|
|
max_h = multiple_up(math.ceil(width / self.get_value()), multiple) |
|
97
|
|
|
min_h = multiple_down(math.floor(width / self.get_value()), multiple) |
|
98
|
|
|
|
|
99
|
|
|
max_r = abs(self.get_value() - (width / max_h)) |
|
100
|
|
|
min_r = abs(self.get_value() - (width / min_h)) |
|
101
|
|
|
|
|
102
|
|
|
return max_h if max_r < min_r else min_h |
|
103
|
|
|
|
|
104
|
|
|
|
|
105
|
|
|
class Size: |
|
106
|
|
|
def __init__(self, width: int, height: int): |
|
107
|
|
|
self.width = width |
|
108
|
|
|
self.height = height |
|
109
|
|
|
|
|
110
|
|
|
@property |
|
111
|
|
|
def ratio(self) -> Ratio: |
|
112
|
|
|
return Ratio(self.width, self.height) |
|
113
|
|
|
|
|
114
|
|
|
@property |
|
115
|
|
|
def normalize(self) -> str: |
|
116
|
|
|
return str(self.width) + "x" + str(self.height) |
|
117
|
|
|
|
|
118
|
|
|
|
|
119
|
|
|
__all__ = [ |
|
120
|
|
|
'Size', |
|
121
|
|
|
'Bitrate' |
|
122
|
|
|
] |
aminyazdanpanah /
python-ffmpeg-video-streaming
