#7266 closed defect (wontfix)
Splitting 5.1 audio into discrete AAC streams is broken in FFmpeg
Reported by: | Bryan Bortz | Owned by: | |
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Priority: | important | Component: | avcodec |
Version: | git-master | Keywords: | aac regression |
Cc: | owlboy@owlboy.com | Blocked By: | |
Blocking: | Reproduced by developer: | yes | |
Analyzed by developer: | no |
Description
Up until FFmpeg v4.0 I have been able to run the following command on an input video file that contains an H.264 video track and either AC3 or DTS audio stream and produce an MP4 that has 6 streams of audio. Each stream corresponds to a channel of the 5.1 audio.
ffmpeg -i INPUT.MKV -vcodec copy -filter_complex channelsplit=channel_layout=5.1 -acodec aac -movflags faststart OUTPUT.MP4
It even worked on Stereo tracks and put the L and R channels into the proper places and produced some extraneous silent tracks for the other 4 channels.
But now in v4.0.1 I get the following error:
[aac @ 0x7f7f65001e00] Unsupported channel layout
Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
Conversion failed!
Changing the command to be the following does not improve things:
ffmpeg -i INPUT.MKV -vcodec copy -filter_complex "channelsplit=channel_layout=5.1[FL][FR][FC][LFE][BL][BR]" -acodec aac -movflags faststart OUTPUT.MP4
It gives the following error:
Filter channelsplit:BR has an unconnected output
(Note that BL/BR and SL/SR both produce the same error about BR)
This MP4 file structure is useful for playing back inside of Unity with virtual speakers placed in the environment.
My end goal:
- MP4 (MOOV Atom at the Front)
-H.264 Video Stream
-AAC Audio Stream - FL
-AAC Audio Stream - FR
-AAC Audio Stream - FC
-AAC Audio Stream - LFE
-AAC Audio Stream - SL
-AAC Audio Stream - SR
Attachments (4)
Change History (13)
by , 6 years ago
Attachment: | ffmpeg-20180620-111122.log added |
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comment:1 by , 6 years ago
Cc: | added |
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comment:2 by , 6 years ago
Keywords: | mp4 multiple-streams removed |
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How is the issue you see related to the log you attached?
Please test current FFmpeg git head and provide the command line you tested together with the complete, uncut console output to make this a valid ticket.
by , 6 years ago
Attachment: | ffmpeg-20180620-121649.log added |
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-report log - Previous log was not the correct log!
comment:3 by , 6 years ago
@cehoyos Sorry about that! I grabbed the wrong -report log!
The correct log (ffmpeg-20180620-121649.log) Is now attached.
ffmpeg -i /Users/bryan.bortz/Movies/the_gate-1987-intro.mp4 -vcodec copy -filter_complex channelsplit=channel_layout=5.1 -acodec aac -movflags faststart -report output-test.mp4
comment:4 by , 6 years ago
I am also attaching a log from v3.4.2 where the same command succeeds and provides the desired and expected output:
ffmpeg-20180620-122243-v3.4.2.log
by , 6 years ago
Attachment: | ffmpeg-20180620-122243-v3.4.2.log added |
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-report of the command working on v3.4.2
comment:5 by , 6 years ago
Component: | undetermined → avcodec |
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Keywords: | regression added |
Priority: | normal → important |
Reproduced by developer: | set |
Status: | new → open |
Summary: | Splitting 5.1 audio into discrete AAC streams is broken in FFmpeg 4.0.1 → Splitting 5.1 audio into discrete AAC streams is broken in FFmpeg |
Regression since fbf295e2bd4d48d7a0a094ed5afce2fa5b6cf35a
Please confirm that the issue was also reproducible with FFmpeg 4.0.
comment:6 by , 6 years ago
Can confirm the behavior exists in FFmpeg 4.0. (additional log attached: ffmpeg-20180620-165657-v4.0.log)
follow-up: 8 comment:7 by , 6 years ago
Resolution: | → wontfix |
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Status: | open → closed |
This is usage issue. You need to add to every single output of your filtergraph aformat=channel_layouts=mono
and properly map them to output.
AAC with PCE can not encode FL/FR/SL/SR/.. channel layouts, so you need to convert each stream to mono channel layout.
comment:8 by , 6 years ago
Replying to richardpl:
This is usage issue. You need to add to every single output of your filtergraph
aformat=channel_layouts=mono
and properly map them to output.
AAC with PCE can not encode FL/FR/SL/SR/.. channel layouts, so you need to convert each stream to mono channel layout.
Can I request an example? Thank you.
comment:9 by , 6 years ago
"channelsplit=channel_layout=5.1[FL][FR][FC][LFE][BL][BR],[FL]aformat=channel_layouts=mono[FL];[FR]aformat=channel_layouts=mono[FR];[FC]aformat=channel_layouts=mono[FC];[LFE]aformat=channel_layouts=mono[LFE];[BL]aformat=channel_layouts=mono[BL];[BR]aformat=channel_layouts=mono[BR]"
-report log