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https://github.com/jeertmans/manim-slides.git
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74ddefe519
* chore(deps): remove subprocess calls to FFMPEG with `av` Linked to the progess made in https://github.com/ManimCommunity/manim/pull/3501. The following PR aims at reducing subprocess calls for security and speed reasons. Also, with https://github.com/ManimCommunity/manim/pull/3501 is merged, FFMPEG should not be needed anymore as it is part of `PyAv`. * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * fix(lib): oops forgot to commit those changes * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * chore(lib): clear assets and clean code * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * chore(doc): document changes --------- Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
99 lines
2.9 KiB
Python
99 lines
2.9 KiB
Python
import hashlib
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import tempfile
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from pathlib import Path
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from typing import List
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import av
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from .logger import logger
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def concatenate_video_files(files: List[Path], dest: Path) -> None:
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"""Concatenate multiple video files into one."""
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f = tempfile.NamedTemporaryFile(mode="w", delete=False)
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f.writelines(f"file '{path.absolute()}'\n" for path in files)
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f.close()
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input_ = av.open(f.name, options={"safe": "0"}, format="concat")
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input_stream = input_.streams.video[0]
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output = av.open(str(dest), mode="w")
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output_stream = output.add_stream(
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template=input_stream,
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)
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for packet in input_.demux(input_stream):
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# We need to skip the "flushing" packets that `demux` generates.
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if packet.dts is None:
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continue
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# We need to assign the packet to the new stream.
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packet.stream = output_stream
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output.mux(packet)
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input_.close()
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output.close()
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def merge_basenames(files: List[Path]) -> Path:
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"""Merge multiple filenames by concatenating basenames."""
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if len(files) == 0:
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raise ValueError("Cannot merge an empty list of files!")
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dirname: Path = files[0].parent
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ext = files[0].suffix
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basenames = list(file.stem for file in files)
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basenames_str = ",".join(f"{len(b)}:{b}" for b in basenames)
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# We use hashes to prevent too-long filenames, see issue #123:
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# https://github.com/jeertmans/manim-slides/issues/123
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basename = hashlib.sha256(basenames_str.encode()).hexdigest()
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logger.debug(f"Generated a new basename for basenames: {basenames} -> '{basename}'")
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return dirname.joinpath(basename + ext)
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def link_nodes(*nodes: av.filter.context.FilterContext) -> None:
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"""Code from https://github.com/PyAV-Org/PyAV/issues/239."""
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for c, n in zip(nodes, nodes[1:]):
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c.link_to(n)
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def reverse_video_file(src: Path, dest: Path) -> None:
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"""Reverses a video file, writting the result to `dest`."""
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input_ = av.open(str(src))
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input_stream = input_.streams.video[0]
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output = av.open(str(dest), mode="w")
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output_stream = output.add_stream(codec_name="libx264", rate=input_stream.base_rate)
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output_stream.width = input_stream.width
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output_stream.height = input_stream.height
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output_stream.pix_fmt = input_stream.pix_fmt
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graph = av.filter.Graph()
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link_nodes(
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graph.add_buffer(template=input_stream),
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graph.add("reverse"),
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graph.add("buffersink"),
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)
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graph.configure()
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frames_count = 0
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for frame in input_.decode(video=0):
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graph.push(frame)
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frames_count += 1
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graph.push(None) # EOF: https://github.com/PyAV-Org/PyAV/issues/886.
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for i in range(frames_count):
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frame = graph.pull()
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frame.pict_type = 1 # Otherwise we get a warning saying it is changed
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output.mux(output_stream.encode(frame))
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for packet in output_stream.encode():
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output.mux(packet)
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input_.close()
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output.close()
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