[FFmpeg-user] ProRes422 with 8 audio tracks converted to mp4 -- muffles audio 4
Carl Eugen Hoyos
ceffmpeg at gmail.com
Wed Nov 21 19:04:30 EET 2018
2018-11-21 16:27 GMT+01:00, Harvey Pikelberger <communque at gmail.com>:
>
>> On Nov 20, 2018, at 3:05 AM, Carl Eugen Hoyos <ceffmpeg at gmail.com> wrote:
>>
>> 2018-11-20 4:28 GMT+01:00, Harvey Pikelberger <communque at gmail.com>:
>>> Testing the creation of 8-audio-channel mp4 proxies from ProRes422
>>> sources using ffmpeg. For some reason audio channel 4 of the mp4
>>> is coming back muffled, like it got drowned in a pool.
>>
>
>>
>> Every aac encoder will assume that one of eight input channels is the
>> lfe channel and will only encode low frequencies for this channel.
>> (Maybe not "every" but in any case, this is the issue you see.)
>
> That makes sounds correct. I would think that would account for the muffled
> audio 4.
> Indeed, in the stdout you can see that ffmpeg "guessed" mono for the DNx
> source and at 7.1 for the ProRes source.
> How to force ffmpeg to treat the ProRes as mono sources?
You have to use the asplit filter (as you cannot treat 7.1 as mono).
>> In case I misunderstood the issue and this is really 7.1 input
>
> It's not, at least intentionally, 7.1 input.
>
> The goal is to test sources with 8 tracks of mono sound, logic being that
> these are files that are delivered to post for editing purposes, and for
> which we need to generate proxies.
>
> We're working in Premiere Pro, where proxy audio channel count / assigns
> have to match that of the original files.
> Our goal here is to convert full res sources to h264 such that the sound
> matches the original so that Premiere accepts them as legitimate proxies.
>
> So far ffmpeg is the only tool that has successfully processed video sources
> with 4-audio-channel into 4-audio-channel h264/mp4 files.
>
> But we also get sources with 5-8 audio channels, hence these rounds of
> testing.
>
>
>> but the
>> encoding is broken: Our aac encoder provides acceptable output for
>> mono and stereo, maybe not for other layouts and there is an
>> unavoidable issue for 7.1 aac because of a flaw in the specification,
>> feel free to test with the libfdk aac encoder.
>
> To test with libfdk aac encoder, where would you specify that in the CLI
> here?
-acodec libfdk_aac
> ffmpeg -i SoundMappingTest-H8Discreet.mov -map 0 -g 48 -c:v libx264
> -profile:v baseline -crf 16 -c:a aac -b:a 256k -vf scale=1280:720 -pix_fmt
> yuv420p SoundMappingTest-H8Discreet.mp4
>
>>
>>
>>> Recently tested using DNxHD mxf files -- same audio configuration
>>> and everything worked perfectly.
The audio configuration of your two input is very different...
>>
>> That sounds very unlikely / command line and complete, uncut console
>> output missing.
>
> RE "complete, uncut console output missing": Not sure why. Tried to be
> careful, but who knows.
> Will attach the stdouts for both the DNx and ProRes tests below...
... which the console output very clearly shows.
>
> Also, I posted the source and output files to the web.
> Apologies for the audio content. I randomly grabbed sound of someone
> reading numbers 1 to 8 out loud from a Spanish language children's show -- a
> little abrasive to say the least.
>
>
> DNx
> Source: https://drive.google.com/open?id=1kR6aYKv90cxl-HJe04_wssoxsLfJK78z
> <https://drive.google.com/open?id=1kR6aYKv90cxl-HJe04_wssoxsLfJK78z>
> Output: https://drive.google.com/open?id=1HgiV0Dc42iBwLurI857zc3RO8Oig9-M1
> <https://drive.google.com/open?id=1HgiV0Dc42iBwLurI857zc3RO8Oig9-M1>
>
> ProRes
> Source: https://drive.google.com/open?id=1xEG6FsxdQ53j-TE2qaegw-8QjB4il0IF
> <https://drive.google.com/open?id=1xEG6FsxdQ53j-TE2qaegw-8QjB4il0IF>
> Output: https://drive.google.com/open?id=1Itua1QXhUyozhssVnvvNULdkNe3X28MA
> <https://drive.google.com/open?id=1Itua1QXhUyozhssVnvvNULdkNe3X28MA>
>
> stdout for DNx
> ffmpeg version 4.0.2 Copyright (c) 2000-2018 the FFmpeg developers
old and unsupported although this may make no difference in your case.
> built with Apple LLVM version 10.0.0 (clang-1000.10.44.2)
> configuration: --prefix=/usr/local/Cellar/ffmpeg/4.0.2_1 --enable-shared
> --enable-pthreads --enable-version3 --enable-hardcoded-tables
> --enable-avresample --cc=clang --host-cflags= --host-ldflags=
> --enable-ffplay --enable-gpl --enable-libmp3lame --enable-libopus
> --enable-libsnappy --enable-libtheora --enable-libvorbis --enable-libvpx
> --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma
> --enable-chromaprint --enable-libass --enable-libfdk-aac
> --enable-libfreetype --enable-libopencore-amrnb --enable-libopencore-amrwb
> --enable-libopenh264 --enable-librsvg --enable-librtmp
> --enable-librubberband --enable-libsoxr --enable-libssh
> --enable-libtesseract --enable-libvidstab --enable-libwebp --enable-libzimg
> --enable-libzmq --enable-opencl --enable-openssl --enable-videotoolbox
> --enable-libopenjpeg --disable-decoder=jpeg2000
> --extra-cflags=-I/usr/local/Cellar/openjpeg/2.3.0/include/openjpeg-2.3
> --enable-nonfree
> libavutil 56. 14.100 / 56. 14.100
> libavcodec 58. 18.100 / 58. 18.100
> libavformat 58. 12.100 / 58. 12.100
> libavdevice 58. 3.100 / 58. 3.100
> libavfilter 7. 16.100 / 7. 16.100
> libavresample 4. 0. 0 / 4. 0. 0
> libswscale 5. 1.100 / 5. 1.100
> libswresample 3. 1.100 / 3. 1.100
> libpostproc 55. 1.100 / 55. 1.100
> Guessed Channel Layout for Input Stream #0.1 : mono
> Guessed Channel Layout for Input Stream #0.2 : mono
> Guessed Channel Layout for Input Stream #0.3 : mono
> Guessed Channel Layout for Input Stream #0.4 : mono
> Guessed Channel Layout for Input Stream #0.5 : mono
> Guessed Channel Layout for Input Stream #0.6 : mono
> Guessed Channel Layout for Input Stream #0.7 : mono
> Guessed Channel Layout for Input Stream #0.8 : mono
> Input #0, mxf, from 'SoundMappingTest-C.mxf':
> Metadata:
> uid : a6adbf01-ec0b-11e8-9a0e-784f43779667
> generation_uid : a6adbf02-ec0b-11e8-92a9-784f43779667
> company_name : Adobe Systems Incorporated
> product_name : Adobe Media Encoder
> product_version : 12.1.2
> application_platform: Mac OS X
> product_uid : 0c3919fe-46e8-11e5-a151-feff819cdc9f
> modification_date: 2018-11-19T14:59:02.000000Z
> material_package_umid:
> 0x060A2B340101010501010D1113000000D81A37034184058816D8784F43779667
> timecode : 00:00:00:00
> Duration: 00:00:36.70, start: 0.000000, bitrate: 191705 kb/s
> Stream #0:0: Video: dnxhd (DNXHD), yuv422p(bt709/unknown/unknown,
> progressive), 1920x1080, SAR 1:1 DAR 16:9, 23.98 fps, 23.98 tbr, 23.98 tbn,
> 23.98 tbc
> Metadata:
> file_package_umid:
> 0x060A2B340101010501010D12138515CFD81A370341840588D4EA784F43779667
> file_package_name: Source Package
> track_name : Track 1
> Stream #0:1: Audio: pcm_s16le, 48000 Hz, mono, s16, 768 kb/s
> Metadata:
> file_package_umid:
> 0x060A2B340101010501010D12138515CFD81A370341840588D4EA784F43779667
> file_package_name: Source Package
> track_name : Track 2
> Stream #0:2: Audio: pcm_s16le, 48000 Hz, mono, s16, 768 kb/s
> Metadata:
> file_package_umid:
> 0x060A2B340101010501010D12138515CFD81A370341840588D4EA784F43779667
> file_package_name: Source Package
> track_name : Track 3
> Stream #0:3: Audio: pcm_s16le, 48000 Hz, mono, s16, 768 kb/s
> Metadata:
> file_package_umid:
> 0x060A2B340101010501010D12138515CFD81A370341840588D4EA784F43779667
> file_package_name: Source Package
> track_name : Track 4
> Stream #0:4: Audio: pcm_s16le, 48000 Hz, mono, s16, 768 kb/s
> Metadata:
> file_package_umid:
> 0x060A2B340101010501010D12138515CFD81A370341840588D4EA784F43779667
> file_package_name: Source Package
> track_name : Track 5
> Stream #0:5: Audio: pcm_s16le, 48000 Hz, mono, s16, 768 kb/s
> Metadata:
> file_package_umid:
> 0x060A2B340101010501010D12138515CFD81A370341840588D4EA784F43779667
> file_package_name: Source Package
> track_name : Track 6
> Stream #0:6: Audio: pcm_s16le, 48000 Hz, mono, s16, 768 kb/s
> Metadata:
> file_package_umid:
> 0x060A2B340101010501010D12138515CFD81A370341840588D4EA784F43779667
> file_package_name: Source Package
> track_name : Track 7
> Stream #0:7: Audio: pcm_s16le, 48000 Hz, mono, s16, 768 kb/s
> Metadata:
> file_package_umid:
> 0x060A2B340101010501010D12138515CFD81A370341840588D4EA784F43779667
> file_package_name: Source Package
> track_name : Track 8
> Stream #0:8: Audio: pcm_s16le, 48000 Hz, mono, s16, 768 kb/s
> Metadata:
> file_package_umid:
> 0x060A2B340101010501010D12138515CFD81A370341840588D4EA784F43779667
> file_package_name: Source Package
> track_name : Track 9
> Stream mapping:
> Stream #0:0 -> #0:0 (dnxhd (native) -> h264 (libx264))
> Stream #0:1 -> #0:1 (pcm_s16le (native) -> aac (native))
> Stream #0:2 -> #0:2 (pcm_s16le (native) -> aac (native))
> Stream #0:3 -> #0:3 (pcm_s16le (native) -> aac (native))
> Stream #0:4 -> #0:4 (pcm_s16le (native) -> aac (native))
> Stream #0:5 -> #0:5 (pcm_s16le (native) -> aac (native))
> Stream #0:6 -> #0:6 (pcm_s16le (native) -> aac (native))
> Stream #0:7 -> #0:7 (pcm_s16le (native) -> aac (native))
> Stream #0:8 -> #0:8 (pcm_s16le (native) -> aac (native))
> Press [q] to stop, [?] for help
> [libx264 @ 0x7f98a681c800] using SAR=1/1
> [libx264 @ 0x7f98a681c800] using cpu capabilities: MMX2 SSE2Fast SSSE3
> SSE4.2 AVX FMA3 BMI2 AVX2
> [libx264 @ 0x7f98a681c800] profile Constrained Baseline, level 3.1
> [libx264 @ 0x7f98a681c800] 264 - core 152 r2854 e9a5903 - H.264/MPEG-4 AVC
> codec - Copyleft 2003-2017 - http://www.videolan.org/x264.html - options:
> cabac=0 ref=3 deblock=1:0:0 analyse=0x1:0x111 me=hex subme=7 psy=1
> psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=0
> cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12
> lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0
> bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=48
> keyint_min=4 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1
> crf=16.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
> Output #0, mp4, to 'SoundMappingTest-C2.mp4':
> Metadata:
> uid : a6adbf01-ec0b-11e8-9a0e-784f43779667
> generation_uid : a6adbf02-ec0b-11e8-92a9-784f43779667
> company_name : Adobe Systems Incorporated
> product_name : Adobe Media Encoder
> product_version : 12.1.2
> application_platform: Mac OS X
> product_uid : 0c3919fe-46e8-11e5-a151-feff819cdc9f
> modification_date: 2018-11-19T14:59:02.000000Z
> material_package_umid:
> 0x060A2B340101010501010D1113000000D81A37034184058816D8784F43779667
> timecode : 00:00:00:00
> encoder : Lavf58.12.100
> Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p,
> 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 0.04 fps, 24k tbn, 23.98 tbc
> Metadata:
> file_package_umid:
> 0x060A2B340101010501010D12138515CFD81A370341840588D4EA784F43779667
> file_package_name: Source Package
> track_name : Track 1
> encoder : Lavc58.18.100 libx264
> Side data:
> cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
> Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp,
> 256 kb/s
> Metadata:
> file_package_umid:
> 0x060A2B340101010501010D12138515CFD81A370341840588D4EA784F43779667
> file_package_name: Source Package
> track_name : Track 2
> encoder : Lavc58.18.100 aac
> Stream #0:2: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp,
> 256 kb/s
> Metadata:
> file_package_umid:
> 0x060A2B340101010501010D12138515CFD81A370341840588D4EA784F43779667
> file_package_name: Source Package
> track_name : Track 3
> encoder : Lavc58.18.100 aac
> Stream #0:3: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp,
> 256 kb/s
> Metadata:
> file_package_umid:
> 0x060A2B340101010501010D12138515CFD81A370341840588D4EA784F43779667
> file_package_name: Source Package
> track_name : Track 4
> encoder : Lavc58.18.100 aac
> Stream #0:4: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp,
> 256 kb/s
> Metadata:
> file_package_umid:
> 0x060A2B340101010501010D12138515CFD81A370341840588D4EA784F43779667
> file_package_name: Source Package
> track_name : Track 5
> encoder : Lavc58.18.100 aac
> Stream #0:5: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp,
> 256 kb/s
> Metadata:
> file_package_umid:
> 0x060A2B340101010501010D12138515CFD81A370341840588D4EA784F43779667
> file_package_name: Source Package
> track_name : Track 6
> encoder : Lavc58.18.100 aac
> Stream #0:6: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp,
> 256 kb/s
> Metadata:
> file_package_umid:
> 0x060A2B340101010501010D12138515CFD81A370341840588D4EA784F43779667
> file_package_name: Source Package
> track_name : Track 7
> encoder : Lavc58.18.100 aac
> Stream #0:7: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp,
> 256 kb/s
> Metadata:
> file_package_umid:
> 0x060A2B340101010501010D12138515CFD81A370341840588D4EA784F43779667
> file_package_name: Source Package
> track_name : Track 8
> encoder : Lavc58.18.100 aac
> Stream #0:8: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp,
> 256 kb/s
> Metadata:
> file_package_umid:
> 0x060A2B340101010501010D12138515CFD81A370341840588D4EA784F43779667
> file_package_name: Source Package
> track_name : Track 9
> encoder : Lavc58.18.100 aac
> frame= 44 fps=0.0 q=0.0 size= 0kB time=00:00:02.11 bitrate=
> 0.2kbits/sframe= 78 fps= 78 q=21.0 size= 512kB time=00:00:03.54
> bitrate=1184.5kbits/frame= 109 fps= 73 q=21.0 size= 1536kB
> time=00:00:04.82 bitrate=2609.9kbits/frame= 140 fps= 70 q=21.0 size=
> 2560kB time=00:00:06.12 bitrate=3425.3kbits/frame= 172 fps= 69 q=21.0 size=
> 3584kB time=00:00:07.40 bitrate=3966.2kbits/frame= 201 fps= 67 q=21.0
> size= 4608kB time=00:00:08.66 bitrate=4358.4kbits/frame= 231 fps= 66
> q=21.0 size= 5632kB time=00:00:09.92 bitrate=4651.0kbits/frame= 260 fps=
> 65 q=21.0 size= 6656kB time=00:00:11.11 bitrate=4905.8kbits/frame= 288
> fps= 64 q=21.0 size= 7680kB time=00:00:12.28 bitrate=5120.0kbits/frame=
> 319 fps= 64 q=21.0 size= 8960kB time=00:00:13.58
> bitrate=5401.3kbits/frame= 351 fps= 64 q=21.0 size= 9984kB
> time=00:00:14.91 bitrate=5484.8kbits/frame= 380 fps= 63 q=21.0 size=
> 11008kB time=00:00:16.12 bitrate=5591.4kbits/frame= 412 fps= 63 q=21.0
> size= 12032kB time=00:00:17.47 bitrate=5641.4kbits/frame= 443 fps= 63
> q=21.0 size= 13056kB time=00:00:18.75 bitrate=5703.7kbits/frame= 473 fps=
> 63 q=21.0 size= 13824kB time=00:00:20.01 bitrate=5659.3kbits/frame= 504
> fps= 63 q=21.0 size= 14848kB time=00:00:21.31 bitrate=5707.4kbits/frame=
> 534 fps= 62 q=18.0 size= 15616kB time=00:00:22.54
> bitrate=5673.2kbits/frame= 565 fps= 62 q=21.0 size= 16640kB
> time=00:00:23.85 bitrate=5715.4kbits/frame= 596 fps= 62 q=21.0 size=
> 17664kB time=00:00:25.13 bitrate=5758.1kbits/frame= 623 fps= 62 q=21.0
> size= 18432kB time=00:00:26.26 bitrate=5749.7kbits/frame= 650 fps= 62
> q=21.0 size= 19456kB time=00:00:27.39 bitrate=5818.6kbits/frame= 678 fps=
> 61 q=21.0 size= 20480kB time=00:00:28.56 bitrate=5873.3kbits/frame= 706
> fps= 61 q=21.0 size= 21248kB time=00:00:29.71 bitrate=5857.3kbits/frame=
> 736 fps= 61 q=21.0 size= 22272kB time=00:00:30.97
> bitrate=5890.1kbits/frame= 767 fps= 61 q=21.0 size= 23296kB
> time=00:00:32.27 bitrate=5912.5kbits/frame= 796 fps= 61 q=21.0 size=
> 24320kB time=00:00:33.47 bitrate=5952.1kbits/frame= 827 fps= 61 q=21.0
> size= 25344kB time=00:00:34.77 bitrate=5970.6kbits/frame= 857 fps= 61
> q=21.0 size= 26112kB time=00:00:36.03 bitrate=5936.7kbits/frame= 880 fps=
> 58 q=-1.0 Lsize= 28524kB time=00:00:36.71 bitrate=6364.5kbits/s
> speed=2.43x
> video:19416kB audio:8989kB subtitle:0kB other streams:0kB global headers:0kB
> muxing overhead: 0.422849%
> [libx264 @ 0x7f98a681c800] frame I:25 Avg QP:12.62 size: 73971
> [libx264 @ 0x7f98a681c800] frame P:855 Avg QP:15.24 size: 21090
> [libx264 @ 0x7f98a681c800] mb I I16..4: 25.6% 0.0% 74.4%
> [libx264 @ 0x7f98a681c800] mb P I16..4: 11.3% 0.0% 7.8% P16..4: 43.4%
> 18.9% 5.6% 0.0% 0.0% skip:13.1%
> [libx264 @ 0x7f98a681c800] coded y,uvDC,uvAC intra: 40.2% 71.1% 34.1% inter:
> 18.3% 41.4% 1.7%
> [libx264 @ 0x7f98a681c800] i16 v,h,dc,p: 45% 25% 13% 17%
> [libx264 @ 0x7f98a681c800] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 30% 24% 17% 5%
> 6% 5% 5% 5% 4%
> [libx264 @ 0x7f98a681c800] i8c dc,h,v,p: 49% 21% 23% 6%
> [libx264 @ 0x7f98a681c800] ref P L0: 68.3% 20.9% 10.8%
> [libx264 @ 0x7f98a681c800] kb/s:4333.32
> [aac @ 0x7f98a681e000] Qavg: 125.339
> [aac @ 0x7f98a681f200] Qavg: 602.799
> [aac @ 0x7f98a6820400] Qavg: 1345.386
> [aac @ 0x7f98a6821600] Qavg: 55054.453
> [aac @ 0x7f98a6822800] Qavg: 42813.750
> [aac @ 0x7f98a6823a00] Qavg: 503.112
> [aac @ 0x7f98a6824c00] Qavg: 51539.637
> [aac @ 0x7f98a701dc00] Qavg: 58240.789
>
> stdout for ProRes
> $ ffmpeg -i SoundMappingTest-H8Discreet.mov -map 0 -g 48 -c:v libx264
> -profile:v baseline -crf 16 -c:a aac -b:a 256k -vf scale=1280:720 -pix_fmt
> yuv420p SoundMappingTest-H8Discreet.mp4
> ffmpeg version 4.0.2 Copyright (c) 2000-2018 the FFmpeg developers
> built with Apple LLVM version 10.0.0 (clang-1000.10.44.2)
> configuration: --prefix=/usr/local/Cellar/ffmpeg/4.0.2_1 --enable-shared
> --enable-pthreads --enable-version3 --enable-hardcoded-tables
> --enable-avresample --cc=clang --host-cflags= --host-ldflags=
> --enable-ffplay --enable-gpl --enable-libmp3lame --enable-libopus
> --enable-libsnappy --enable-libtheora --enable-libvorbis --enable-libvpx
> --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma
> --enable-chromaprint --enable-libass --enable-libfdk-aac
> --enable-libfreetype --enable-libopencore-amrnb --enable-libopencore-amrwb
> --enable-libopenh264 --enable-librsvg --enable-librtmp
> --enable-librubberband --enable-libsoxr --enable-libssh
> --enable-libtesseract --enable-libvidstab --enable-libwebp --enable-libzimg
> --enable-libzmq --enable-opencl --enable-openssl --enable-videotoolbox
> --enable-libopenjpeg --disable-decoder=jpeg2000
> --extra-cflags=-I/usr/local/Cellar/openjpeg/2.3.0/include/openjpeg-2.3
> --enable-nonfree
> libavutil 56. 14.100 / 56. 14.100
> libavcodec 58. 18.100 / 58. 18.100
> libavformat 58. 12.100 / 58. 12.100
> libavdevice 58. 3.100 / 58. 3.100
> libavfilter 7. 16.100 / 7. 16.100
> libavresample 4. 0. 0 / 4. 0. 0
> libswscale 5. 1.100 / 5. 1.100
> libswresample 3. 1.100 / 3. 1.100
> libpostproc 55. 1.100 / 55. 1.100
> Guessed Channel Layout for Input Stream #0.1 : 7.1
> Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'SoundMappingTest-H8Discreet.mov':
> Metadata:
> major_brand : qt
> minor_version : 537199360
> compatible_brands: qt
> creation_time : 2018-11-20T03:09:22.000000Z
> Duration: 00:00:36.70, start: 0.000000, bitrate: 115812 kb/s
> Stream #0:0(eng): Video: prores (apcn / 0x6E637061), yuv422p10le(bt709,
> progressive), 1920x1080, 109439 kb/s, SAR 1:1 DAR 16:9, 23.98 fps, 23.98
> tbr, 24k tbn, 24k tbc (default)
> Metadata:
> creation_time : 2018-11-20T03:09:22.000000Z
> handler_name : Apple Alias Data Handler
> encoder : Apple ProRes 422
> timecode : 00:00:00:00
> Stream #0:1(eng): Audio: pcm_s16le (lpcm / 0x6D63706C), 48000 Hz, 7.1,
> s16, 6144 kb/s (default)
If the audio is flagged as 7.1 but in fact it is not, I don't think there
is a bug that can be fixed in FFmpeg.
If you increase the width of your console window, the output
gets even more readable.
Carl Eugen
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