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from enum import Enum
from pathlib import Path
from re import split
from typing import Annotated, Optional, Union
import ffmpeg
from ffmpeg.nodes import FilterNode, InputNode
from torch import Value
class VideoCodec(str, Enum):
gif = "gif"
vp9 = "vp9"
webm = "webm"
webp = "webp"
h264 = "h264"
hevc = "hevc"
def codec_extn(codec: VideoCodec):
match codec:
case VideoCodec.gif:
return "gif"
case VideoCodec.vp9:
return "webm"
case VideoCodec.webm:
return "webm"
case VideoCodec.webp:
return "webp"
case VideoCodec.h264:
return "mp4"
case VideoCodec.hevc:
return "mp4"
case _:
raise ValueError(f"Unknown codec {codec}")
def clamp_gif_fps(fps: int):
"""Clamp FPS to a value that is supported by GIFs.
GIF frame duration is measured in 1/100ths of a second, so we need to clamp the
FPS to a value that 100 is a factor of.
"""
# the sky is not the limit, sadly...
if fps > 100:
return 100
# if 100/fps is an integer, we're good
if 100 % fps == 0:
return fps
# but of course, it was never going to be that easy.
match fps:
case x if x > 50:
# 50 is the highest FPS that 100 is a factor of.
# people will ask for 60. they will get 50, and they will like it.
return 50
case x if x >= 30:
return 33
case x if x >= 24:
return 25
case x if x >= 20:
return 20
case x if x >= 15:
# ffmpeg will pad a few frames to make this work
return 16
case x if x >= 12:
return 12
case x if x >= 10:
# idk why anyone would request 11fps, but they're getting 10
return 10
case x if x >= 6:
# also invalid but ffmpeg will pad it
return 6
case 4:
return 4 # FINE, I GUESS
case _:
return 1 # I don't know why you would want this, but here you go
class FfmpegEncoder:
def __init__(
self,
frames_dir: Path,
out_file: Path,
codec: VideoCodec,
in_fps: int = 60,
out_fps: int = 60,
lossless: bool = False,
param={},
):
self.frames_dir = frames_dir
self.out_file = out_file
self.codec = codec
self.in_fps = in_fps
self.out_fps = out_fps
self.lossless = lossless
self.param = param
self.input: Optional[InputNode] = None
def encode(self) -> tuple:
self.input: InputNode = ffmpeg.input(
str(self.frames_dir.resolve().joinpath("%08d.png")), framerate=self.in_fps
).filter("fps", fps=self.in_fps)
match self.codec:
case VideoCodec.gif:
return self._encode_gif()
case VideoCodec.webm:
return self._encode_webm()
case VideoCodec.webp:
return self._encode_webp()
case VideoCodec.h264:
return self._encode_h264()
case VideoCodec.hevc:
return self._encode_hevc()
case _:
raise ValueError(f"Unknown codec {self.codec}")
@property
def _out_file(self) -> Path:
return str(self.out_file.resolve())
@staticmethod
def _interpolate(stream, out_fps: int) -> FilterNode:
return stream.filter(
"minterpolate", fps=out_fps, mi_mode="mci", mc_mode="aobmc", me_mode="bidir", vsbmc=1
)
def _encode_gif(self) -> tuple:
stream: FilterNode = self.input
# Output FPS must be divisible by 100 for GIFs, so we clamp it
out_fps = clamp_gif_fps(self.out_fps)
if self.in_fps != out_fps:
stream = self._interpolate(stream, out_fps)
# split into two streams for palettegen and paletteuse
split_stream = stream.split()
# generate the palette, then use it to encode the GIF
palette = split_stream[0].filter("palettegen")
stream = ffmpeg.filter([split_stream[1], palette], "paletteuse").output(
self._out_file, vcodec="gif", loop=0
)
return stream.run()
def _encode_webm(self) -> tuple:
stream: FilterNode = self.input
if self.in_fps != self.out_fps:
stream = self._interpolate(stream, self.out_fps)
param = {
"pix_fmt":"yuv420p",
"vcodec":"libvpx-vp9",
"video_bitrate":0,
"crf":24,
}
param.update(**self.param)
stream = stream.output(
self._out_file, **param
)
return stream.run()
def _encode_webp(self) -> tuple:
stream: FilterNode = self.input
if self.in_fps != self.out_fps:
stream = self._interpolate(stream, self.out_fps)
if self.lossless:
param = {
"pix_fmt":"bgra",
"vcodec":"libwebp_anim",
"lossless":1,
"compression_level":5,
"qscale":75,
"loop":0,
}
param.update(**self.param)
stream = stream.output(
self._out_file,
**param
)
else:
param = {
"pix_fmt":"yuv420p",
"vcodec":"libwebp_anim",
"lossless":0,
"compression_level":5,
"qscale":90,
"loop":0,
}
param.update(**self.param)
stream = stream.output(
self._out_file,
**param
)
return stream.run()
def _encode_h264(self) -> tuple:
stream: FilterNode = self.input
if self.in_fps != self.out_fps:
stream = self._interpolate(stream, self.out_fps)
param = {
"pix_fmt":"yuv420p",
"vcodec":"libx264",
"crf":21,
"tune":"animation",
}
param.update(**self.param)
stream = stream.output(
self._out_file, **param
)
return stream.run()
def _encode_hevc(self) -> tuple:
stream: FilterNode = self.input
if self.in_fps != self.out_fps:
stream = self._interpolate(stream, self.out_fps)
param = {
"pix_fmt":"yuv420p",
"vcodec":"libx264",
"crf":21,
"tune":"animation",
}
param.update(**self.param)
stream = stream.output(self._out_file, **param)
return stream.run()
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