delarte/src/delarte/muxing.py

# License: GNU AGPL v3: http://www.gnu.org/licenses/
# This file is part of `delarte` (https://git.afpy.org/fcode/delarte.git)

"""Provide tracks muxing utilities."""

import subprocess


def mux_target(target, _progress):
    """Multiplexes tracks into a single file."""
    cmd = ["ffmpeg", "-hide_banner"]
    cmd.extend(["-i", target.video_track.url])
    cmd.extend(["-i", target.audio_track.url])
    if target.subtitles_track:
        cmd.extend(["-i", target.subtitles_track.url])

    cmd.extend(["-c:v", "copy"])
    cmd.extend(["-c:a", "copy"])
    if target.subtitles_track:
        cmd.extend(["-c:s", "copy"])

    cmd.extend(["-bsf:a", "aac_adtstoasc"])
    cmd.extend(["-metadata:s:a:0", f"language={target.audio_track.meta.language}"])

    if target.subtitles_track:
        cmd.extend(
            ["-metadata:s:s:0", f"language={target.subtitles_track.meta.language}"]
        )
        cmd.extend(["-disposition:s:0", "default"])

    cmd.append(f"{target.file_name}.mkv")

    subprocess.run(cmd)