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[postproc/ffmpeg] fix opus using default quality of 5 as bitrate (closes #28389)

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Fix #28389. When extracting audio, and the containing format isn't 'opus',
but the requested format is, then youtube-dl will call ffmpeg to do the conversion.
Without specifying the preferred quality, youtube-dl defaults to '5'.
Integers 0-9 are currently sent to ffmpeg as the bitrate for 'opus',
which is clearly an error and this commit fixes that. It uses an arbitrary
(specific to opus) scale to convert 0-9 into reasonable bitrates between
6 kb/s to 210 kb/s.... with 5 (the default) giving 96 kb/s
This commit is contained in:
d3fault 2022-05-17 04:30:37 -07:00
parent c7965b9fc2
commit 5831f6feef
1 changed files with 11 additions and 3 deletions
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12
youtube_dl/postprocessor/ffmpeg.py
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@ -21,6 +21,7 @@ from ..utils import (
dfxp2srt,
ISO639Utils,
replace_extension,
compat_str,
)
@ -307,8 +308,15 @@ class FFmpegExtractAudioPP(FFmpegPostProcessor):
extension = self._preferredcodec
more_opts = []
if self._preferredquality is not None:
# The opus codec doesn't support the -aq option
if int(self._preferredquality) < 10 and extension != 'opus':
if int(self._preferredquality) < 10:
if extension == 'opus':
# The opus codec doesn't support the -q:a option
# Magic number of 24 used to give quality numbers 0-9 *some* meaning (as suggested by "knarrff" on Github)
# 0 (best quality) gives 210 kb/s
# 5 (default) gives 96 kb/s
# 9 (worst quality) gives 6 kb/s, which is the opus minimum (and 0 kb/s wouldn't make any sense)
more_opts += ['-b:a', compat_str(max(6, int((9 - int(self._preferredquality)) * 24))) + 'k']
else:
more_opts += ['-q:a', self._preferredquality]
else:
more_opts += ['-b:a', self._preferredquality + 'k']