5.1 atrac3plus mapped wrongly by the FOSS audio decoders

filler56789 · 8th October 2022, 09:46

When decompressed by LAV Audio, MPC Audio Decoder or MPV,
the audio channels of this sample file are mapped wrongly:

back-left is sent to LFE,
back-right is sent to back-left,
and LFE is sent to back-right.

https://www.mediafire.com/file/qazbk...sample.7z/file

filler56789 · 8th October 2022, 14:00

Bug (or design flaw...) reported to ffmpeg's trac:

https://trac.ffmpeg.org/ticket/9964

filler56789 · 9th October 2022, 06:14

Quote:

Originally Posted by filler56789

back-left is sent to LFE,
back-right is sent to back-left,
and LFE is sent to back-right.

According to this page,
it appears the ffmpeg developer for a moment forgot the difference between encoding and decoding.

https://wiki.multimedia.cx/index.php...configurations)

filler56789 · 3rd December 2022, 16:11

FIXED, they say.

http://git.videolan.org/?p=ffmpeg.gi...49b9100c65641b

tebasuna51 · 4th December 2022, 10:34

Yep, seems work fine with my last ffmpeg version N-109027-g202b7a9ae7-20221107

8th October 2022, 09:46	#1 \| Link
filler56789 SuperVirus Join Date: Jun 2012 Location: Antarctic Japan Posts: 1,351	5.1 atrac3plus mapped wrongly by the FOSS audio decoders When decompressed by LAV Audio, MPC Audio Decoder or MPV, the audio channels of this sample file are mapped wrongly: back-left is sent to LFE, back-right is sent to back-left, and LFE is sent to back-right. https://www.mediafire.com/file/qazbk...sample.7z/file __________________ «Your software patents have expired.»

8th October 2022, 14:00	#2 \| Link
filler56789 SuperVirus Join Date: Jun 2012 Location: Antarctic Japan Posts: 1,351	Bug (or design flaw...) reported to ffmpeg's trac: https://trac.ffmpeg.org/ticket/9964 __________________ «Your software patents have expired.»

3rd December 2022, 16:11	#4 \| Link
filler56789 SuperVirus Join Date: Jun 2012 Location: Antarctic Japan Posts: 1,351	FIXED, they say. http://git.videolan.org/?p=ffmpeg.gi...49b9100c65641b __________________ «Your software patents have expired.»

4th December 2022, 10:34	#5 \| Link
tebasuna51 Moderator Join Date: Feb 2005 Location: Spain Posts: 6,915	Yep, seems work fine with my last ffmpeg version N-109027-g202b7a9ae7-20221107 __________________ BeHappy, AviSynth audio transcoder.