rk_pve/pve.py

# People's Video Editor: high quality, GPU accelerated mp4 editor
# Copyright (C) 2025 Roz K <roz@rozk.net>
#
# This file is part of People's Video Editor.
#
# People's Video Editor is free software: you can redistribute it and/or modify it under the terms of the
# GNU General Public License as published by the Free Software Foundation, either version 3 of the License,
# or (at your option) any later version.
#
# People's Video Editor is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
# without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# See the GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along with People's Video Editor.
# If not, see <https://www.gnu.org/licenses/>.

import multiprocessing
import cProfile

from pyav.demuxer import Demuxer
from pyav.decoder import Decoder

demuxer = Demuxer('test.mp4')

print(f"nb_streams  = {demuxer.nb_streams}")
print(f"video codec = {demuxer.video_stream.codec.description()}")
print(f"audio codec = {demuxer.audio_stream.codec.description()}")

cpu_count = multiprocessing.cpu_count()

print(f"using {cpu_count} threads for video decoding")

video_decoder = Decoder(demuxer.video_stream, cpu_count)
audio_decoder = Decoder(demuxer.audio_stream, 1)

num_video_frames = 0
num_audio_frames = 0

with cProfile.Profile() as pr:
    while True:
        packet = demuxer.read_packet()
        eof = (packet is None)
        if eof or demuxer.video_stream.contains(packet):
            video_frames = video_decoder.decode(packet)
            num_video_frames += len(video_frames)
        if eof or demuxer.audio_stream.contains(packet):
            audio_frames = audio_decoder.decode(packet)
            num_audio_frames += len(audio_frames)
        if eof:
            break

print(f"num video frames: {num_video_frames}, audio frames: {num_audio_frames}")
pr.print_stats()