On 1/30/2025 12:29 AM, Pavel Koshevoy wrote:
Hi,I have a file which I can't down-mix to stereo due to AV_CHANNEL_ORDER_NATIVE requirement in sane_layout.
Can you share that file? Or any other that reproduces this?
```
$ ffmpeg -i COMMUNITY_HERO_2.mov -vn -af
'aformat=sample_rates=48000:channel_layouts=stereo' -y /tmp/out.wav
ffmpeg version N-118381-g4ba9ae7742 Copyright (c) 2000-2025 the FFmpeg
developers
built with gcc 7 (SUSE Linux)
configuration: --prefix=/Developer/x86_64 --prefix=/Developer/x86_64
--enable-runtime-cpudetect --enable-libzimg --enable-libx264
--enable-libass --enable-libmodplug --enable-libxml2 --enable-libvmaf
--enable-shared --enable-pthreads --enable-gpl --enable-version3
--enable-gnutls --enable-libfreetype --enable-pic --disable-static
--enable-shared --enable-rpath --enable-ffnvcodec --enable-debug
--disable-stripping --disable-optimizations --disable-mmx
libavutil 59. 56.100 / 59. 56.100
libavcodec 61. 31.101 / 61. 31.101
libavformat 61. 9.106 / 61. 9.106
libavdevice 61. 4.100 / 61. 4.100
libavfilter 10. 9.100 / 10. 9.100
libswscale 8. 13.100 / 8. 13.100
libswresample 5. 4.100 / 5. 4.100
libpostproc 58. 4.100 / 58. 4.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'COMMUNITY_HERO_2.mov':
Metadata:
major_brand : qt
minor_version : 512
compatible_brands: qt
encoder : Lavf58.29.100
Duration: 00:02:02.86, start: 0.000000, bitrate: 97805 kb/s
Stream #0:0[0x1]: Video: prores (LT) (apcs / 0x73637061), yuv422p10le(top
first), 1920x1080, 88583 kb/s, SAR 1:1 DAR 16:9, 29.97 fps, 29.97 tbr, 30k
tbn (default)
Metadata:
handler_name : VideoHandler
vendor_id : FFMP
encoder : Lavc58.54.100 prores
timecode : 14:25:46;28
Stream #0:1[0x2]: Audio: pcm_s24le (in24 / 0x34326E69), 48000 Hz, 8
channels (FL+FR+FC+LFE+SL+SR+BL+BR), s32 (24 bit), 9216 kb/s (default)
Metadata:
handler_name : SoundHandler
vendor_id : [0][0][0][0]
Stream #0:2[0x3](eng): Data: none (tmcd / 0x64636D74)
Metadata:
handler_name : TimeCodeHandler
timecode : 14:25:46;28
Stream mapping:
Stream #0:1 -> #0:0 (pcm_s24le (native) -> pcm_s16le (native))
Press [q] to stop, [?] for help
[auto_aresample_0 @ 0x7ff5bc004900] [SWR @ 0x7ff5bc0049f0] Input channel
layout '8 channels (FL+FR+FC+LFE+SL+SR+BL+BR)' is not supported
[auto_aresample_0 @ 0x7ff5bc004900] Failed to configure output pad on
auto_aresample_0
[af#0:0 @ 0x21841830] Error reinitializing filters!
[af#0:0 @ 0x21841830] Task finished with error code: -22 (Invalid argument)
[af#0:0 @ 0x21841830] Terminating thread with return code -22 (Invalid
argument)
[aost#0:0/pcm_s16le @ 0x218412b0] [enc:pcm_s16le @ 0x21841770] Could not
open encoder before EOF
[aost#0:0/pcm_s16le @ 0x218412b0] Task finished with error code: -22
(Invalid argument)
[aost#0:0/pcm_s16le @ 0x218412b0] Terminating thread with return code -22
(Invalid argument)
[out#0/wav @ 0x21840b80] Nothing was written into output file, because at
least one of its streams received no packets.
size= 0KiB time=N/A bitrate=N/A speed=N/A
Conversion failed!
```
If I remove 2 lines from sane_layout then I am able to process this file
successfully.
However IDK the implications of this change.
swr will attempt to handle things it doesn't understand, like ambisonics or channels in arbitrary positions, potentially crashing.
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