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#!/usr/bin/env python3
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"""
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xconv ffmpeg wrapper based on AdvancedAV
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-----------------------------------------------------------
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AdvancedAV helps with constructing FFmpeg commandline arguments.
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It can automatically parse input files with the help of FFmpeg's ffprobe tool (WiP)
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and allows programatically mapping streams to output files and setting metadata on them.
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-----------------------------------------------------------
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Copyright (c) 2015-2017 Taeyeon Mori
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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-----------------------------------------------------------
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Opus Audiobook profile
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"""
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from ..profile import *
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abdefines = dict(
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stereo="Use two channels at 48k",
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bitrate="Use custom target bitrate",
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fancy="Use 56kbps stereo (For dramatic audiobooks with a lot of music and effects)"
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)
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def apply(stream, defines):
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stream.set(codec="libopus",
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vbr="on",
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b="40k",
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ac="1",
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application="voip")
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if stream.source.channels > 1:
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if "stereo" in defines:
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stream.set(ac="2",
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b="48k")
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if "fancy" in defines:
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stream.set(ac="2",
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b="56k",
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application="audio")
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if "bitrate" in defines:
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stream.bitrate = defines["bitrate"]
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# At most input bitrate; we wouldn't gain anything since opus should be same or better compression
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stream.bitrate = min(stream.bitrate, stream.source.bitrate)
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@profile
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@description("Encode Opus Audiobook")
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@output(container="ogg", ext="ogg")
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@defines(**abdefines)
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@singleaudio
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def audiobook(task, stream, defines):
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apply(task.map_stream(stream), defines)
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return True
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