ffmpeg.exe -loglevel debug -i one.wav -i two.wav -i three.wav -i four.wav -i five.wav -i six.wav -i seven.wav -i eight.wav -filter_complex '[0:0][1:0][2:0][3:0][4:0][5:0][6:0][7:0]join=8:channel_layout=octagonal'  -acodec pcm_s32le output.wav
ffmpeg version git-2020-04-26-1128aa8 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 9.3.1 (GCC) 20200328
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libsrt --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --disable-w32threads --enable-libmfx --enable-ffnvcodec --enable-cuda-llvm --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
  libavutil      56. 43.100 / 56. 43.100
  libavcodec     58. 82.100 / 58. 82.100
  libavformat    58. 42.101 / 58. 42.101
  libavdevice    58.  9.103 / 58.  9.103
  libavfilter     7. 79.100 /  7. 79.100
  libswscale      5.  6.101 /  5.  6.101
  libswresample   3.  6.100 /  3.  6.100
  libpostproc    55.  6.100 / 55.  6.100
Splitting the commandline.
Reading option '-loglevel' ... matched as option 'loglevel' (set logging level) with argument 'debug'.
Reading option '-i' ... matched as input url with argument 'one.wav'.
Reading option '-i' ... matched as input url with argument 'two.wav'.
Reading option '-i' ... matched as input url with argument 'three.wav'.
Reading option '-i' ... matched as input url with argument 'four.wav'.
Reading option '-i' ... matched as input url with argument 'five.wav'.
Reading option '-i' ... matched as input url with argument 'six.wav'.
Reading option '-i' ... matched as input url with argument 'seven.wav'.
Reading option '-i' ... matched as input url with argument 'eight.wav'.
Reading option '-filter_complex' ... matched as option 'filter_complex' (create a complex filtergraph) with argument '[0:0][1:0][2:0][3:0][4:0][5:0][6:0][7:0]join=8:channel_layout=octagonal'.
Reading option '-acodec' ... matched as option 'acodec' (force audio codec ('copy' to copy stream)) with argument 'pcm_s32le'.
Reading option 'output.wav' ... matched as output url.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option loglevel (set logging level) with argument debug.
Applying option filter_complex (create a complex filtergraph) with argument [0:0][1:0][2:0][3:0][4:0][5:0][6:0][7:0]join=8:channel_layout=octagonal.
Successfully parsed a group of options.
Parsing a group of options: input url one.wav.
Successfully parsed a group of options.
Opening an input file: one.wav.
[NULL @ 000002115a0ef380] Opening 'one.wav' for reading
[file @ 000002115a0ef9c0] Setting default whitelist 'file,crypto,data'
[wav @ 000002115a0ef380] Format wav probed with size=2048 and score=99
[wav @ 000002115a0ef380] Before avformat_find_stream_info() pos: 44 bytes read:65580 seeks:1 nb_streams:1
[wav @ 000002115a0ef380] parser not found for codec pcm_s32le, packets or times may be invalid.
    Last message repeated 1 times
[wav @ 000002115a0ef380] All info found
[wav @ 000002115a0ef380] After avformat_find_stream_info() pos: 204844 bytes read:294956 seeks:1 frames:50
Guessed Channel Layout for Input Stream #0.0 : mono
Input #0, wav, from 'one.wav':
  Duration: 00:00:53.28, bitrate: 1024 kb/s
    Stream #0:0, 50, 1/32000: Audio: pcm_s32le ([1][0][0][0] / 0x0001), 32000 Hz, mono, s32, 1024 kb/s
Successfully opened the file.
Parsing a group of options: input url two.wav.
Successfully parsed a group of options.
Opening an input file: two.wav.
[NULL @ 000002115a0efa80] Opening 'two.wav' for reading
[file @ 000002115a0f8040] Setting default whitelist 'file,crypto,data'
[wav @ 000002115a0efa80] Format wav probed with size=2048 and score=99
[wav @ 000002115a0efa80] Before avformat_find_stream_info() pos: 44 bytes read:65580 seeks:1 nb_streams:1
[wav @ 000002115a0efa80] parser not found for codec pcm_s32le, packets or times may be invalid.
    Last message repeated 1 times
[wav @ 000002115a0efa80] All info found
[wav @ 000002115a0efa80] After avformat_find_stream_info() pos: 204844 bytes read:294956 seeks:1 frames:50
Guessed Channel Layout for Input Stream #1.0 : mono
Input #1, wav, from 'two.wav':
  Duration: 00:00:53.28, bitrate: 1024 kb/s
    Stream #1:0, 50, 1/32000: Audio: pcm_s32le ([1][0][0][0] / 0x0001), 32000 Hz, mono, s32, 1024 kb/s
Successfully opened the file.
Parsing a group of options: input url three.wav.
Successfully parsed a group of options.
Opening an input file: three.wav.
[NULL @ 000002115a146480] Opening 'three.wav' for reading
[file @ 000002115a0f00c0] Setting default whitelist 'file,crypto,data'
[wav @ 000002115a146480] Format wav probed with size=2048 and score=99
[wav @ 000002115a146480] Before avformat_find_stream_info() pos: 44 bytes read:65580 seeks:1 nb_streams:1
[wav @ 000002115a146480] parser not found for codec pcm_s32le, packets or times may be invalid.
    Last message repeated 1 times
[wav @ 000002115a146480] All info found
[wav @ 000002115a146480] After avformat_find_stream_info() pos: 204844 bytes read:294956 seeks:1 frames:50
Guessed Channel Layout for Input Stream #2.0 : mono
Input #2, wav, from 'three.wav':
  Duration: 00:00:53.28, bitrate: 1024 kb/s
    Stream #2:0, 50, 1/32000: Audio: pcm_s32le ([1][0][0][0] / 0x0001), 32000 Hz, mono, s32, 1024 kb/s
Successfully opened the file.
Parsing a group of options: input url four.wav.
Successfully parsed a group of options.
Opening an input file: four.wav.
[NULL @ 000002115a14b600] Opening 'four.wav' for reading
[file @ 000002115a14a900] Setting default whitelist 'file,crypto,data'
[wav @ 000002115a14b600] Format wav probed with size=2048 and score=99
[wav @ 000002115a14b600] Before avformat_find_stream_info() pos: 44 bytes read:65580 seeks:1 nb_streams:1
[wav @ 000002115a14b600] parser not found for codec pcm_s32le, packets or times may be invalid.
    Last message repeated 1 times
[wav @ 000002115a14b600] All info found
[wav @ 000002115a14b600] After avformat_find_stream_info() pos: 204844 bytes read:294956 seeks:1 frames:50
Guessed Channel Layout for Input Stream #3.0 : mono
Input #3, wav, from 'four.wav':
  Duration: 00:00:53.28, bitrate: 1024 kb/s
    Stream #3:0, 50, 1/32000: Audio: pcm_s32le ([1][0][0][0] / 0x0001), 32000 Hz, mono, s32, 1024 kb/s
Successfully opened the file.
Parsing a group of options: input url five.wav.
Successfully parsed a group of options.
Opening an input file: five.wav.
[NULL @ 000002115a19c380] Opening 'five.wav' for reading
[file @ 000002115a19b480] Setting default whitelist 'file,crypto,data'
[wav @ 000002115a19c380] Format wav probed with size=2048 and score=99
[wav @ 000002115a19c380] Before avformat_find_stream_info() pos: 102 bytes read:65638 seeks:1 nb_streams:1
[wav @ 000002115a19c380] parser not found for codec pcm_s32le, packets or times may be invalid.
    Last message repeated 1 times
[wav @ 000002115a19c380] All info found
[wav @ 000002115a19c380] After avformat_find_stream_info() pos: 204902 bytes read:295014 seeks:1 frames:50
Input #4, wav, from 'five.wav':
  Metadata:
    encoder         : Lavf55.33.100
  Duration: 00:00:53.28, bitrate: 1024 kb/s
    Stream #4:0, 50, 1/32000: Audio: pcm_s32le ([1][0][0][0] / 0x0001), 32000 Hz, mono, s32, 1024 kb/s
Successfully opened the file.
Parsing a group of options: input url six.wav.
Successfully parsed a group of options.
Opening an input file: six.wav.
[NULL @ 000002115bda0780] Opening 'six.wav' for reading
[file @ 000002115a19cb00] Setting default whitelist 'file,crypto,data'
[wav @ 000002115bda0780] Format wav probed with size=2048 and score=99
[wav @ 000002115bda0780] Before avformat_find_stream_info() pos: 102 bytes read:65638 seeks:1 nb_streams:1
[wav @ 000002115bda0780] parser not found for codec pcm_s32le, packets or times may be invalid.
    Last message repeated 1 times
[wav @ 000002115bda0780] All info found
[wav @ 000002115bda0780] After avformat_find_stream_info() pos: 204902 bytes read:295014 seeks:1 frames:50
Input #5, wav, from 'six.wav':
  Metadata:
    encoder         : Lavf55.33.100
  Duration: 00:00:53.28, bitrate: 1024 kb/s
    Stream #5:0, 50, 1/32000: Audio: pcm_s32le ([1][0][0][0] / 0x0001), 32000 Hz, mono, s32, 1024 kb/s
Successfully opened the file.
Parsing a group of options: input url seven.wav.
Successfully parsed a group of options.
Opening an input file: seven.wav.
[NULL @ 000002115bda8640] Opening 'seven.wav' for reading
[file @ 000002115bd57fc0] Setting default whitelist 'file,crypto,data'
[wav @ 000002115bda8640] Format wav probed with size=2048 and score=99
[wav @ 000002115bda8640] Before avformat_find_stream_info() pos: 102 bytes read:65638 seeks:1 nb_streams:1
[wav @ 000002115bda8640] parser not found for codec pcm_s32le, packets or times may be invalid.
    Last message repeated 1 times
[wav @ 000002115bda8640] All info found
[wav @ 000002115bda8640] After avformat_find_stream_info() pos: 204902 bytes read:295014 seeks:1 frames:50
Input #6, wav, from 'seven.wav':
  Metadata:
    encoder         : Lavf55.33.100
  Duration: 00:00:53.28, bitrate: 1024 kb/s
    Stream #6:0, 50, 1/32000: Audio: pcm_s32le ([1][0][0][0] / 0x0001), 32000 Hz, mono, s32, 1024 kb/s
Successfully opened the file.
Parsing a group of options: input url eight.wav.
Successfully parsed a group of options.
Opening an input file: eight.wav.
[NULL @ 000002115bdfcac0] Opening 'eight.wav' for reading
[file @ 000002115bda1680] Setting default whitelist 'file,crypto,data'
[wav @ 000002115bdfcac0] Format wav probed with size=2048 and score=99
[wav @ 000002115bdfcac0] Before avformat_find_stream_info() pos: 102 bytes read:65638 seeks:1 nb_streams:1
[wav @ 000002115bdfcac0] parser not found for codec pcm_s32le, packets or times may be invalid.
    Last message repeated 1 times
[wav @ 000002115bdfcac0] All info found
[wav @ 000002115bdfcac0] After avformat_find_stream_info() pos: 204902 bytes read:295014 seeks:1 frames:50
Input #7, wav, from 'eight.wav':
  Metadata:
    encoder         : Lavf55.33.100
  Duration: 00:00:53.28, bitrate: 1024 kb/s
    Stream #7:0, 50, 1/32000: Audio: pcm_s32le ([1][0][0][0] / 0x0001), 32000 Hz, mono, s32, 1024 kb/s
Successfully opened the file.
[Parsed_join_0 @ 000002115bda4b80] Setting 'inputs' to value '8'
[Parsed_join_0 @ 000002115bda4b80] Setting 'channel_layout' to value 'octagonal'
Parsing a group of options: output url output.wav.
Applying option acodec (force audio codec ('copy' to copy stream)) with argument pcm_s32le.
Successfully parsed a group of options.
Opening an output file: output.wav.
File 'output.wav' already exists. Overwrite? [y/N] y
[file @ 000002115be9d040] Setting default whitelist 'file,crypto,data'
Successfully opened the file.
Stream mapping:
  Stream #0:0 (pcm_s32le) -> join:input0
  Stream #1:0 (pcm_s32le) -> join:input1
  Stream #2:0 (pcm_s32le) -> join:input2
  Stream #3:0 (pcm_s32le) -> join:input3
  Stream #4:0 (pcm_s32le) -> join:input4
  Stream #5:0 (pcm_s32le) -> join:input5
  Stream #6:0 (pcm_s32le) -> join:input6
  Stream #7:0 (pcm_s32le) -> join:input7
  join -> Stream #0:0 (pcm_s32le)
Press [q] to stop, [?] for help
cur_dts is invalid st:0 (0) [init:0 i_done:0 finish:0] (this is harmless if it occurs once at the start per stream)
    Last message repeated 7 times
detected 8 logical cores
[Parsed_join_0 @ 000002115beba2c0] Setting 'inputs' to value '8'
[Parsed_join_0 @ 000002115beba2c0] Setting 'channel_layout' to value 'octagonal'
[graph_0_in_0_0 @ 000002115beb9740] Setting 'time_base' to value '1/32000'
[graph_0_in_0_0 @ 000002115beb9740] Setting 'sample_rate' to value '32000'
[graph_0_in_0_0 @ 000002115beb9740] Setting 'sample_fmt' to value 's32'
[graph_0_in_0_0 @ 000002115beb9740] Setting 'channel_layout' to value '0x4'
[graph_0_in_0_0 @ 000002115beb9740] tb:1/32000 samplefmt:s32 samplerate:32000 chlayout:0x4
[graph_0_in_1_0 @ 000002115beb9180] Setting 'time_base' to value '1/32000'
[graph_0_in_1_0 @ 000002115beb9180] Setting 'sample_rate' to value '32000'
[graph_0_in_1_0 @ 000002115beb9180] Setting 'sample_fmt' to value 's32'
[graph_0_in_1_0 @ 000002115beb9180] Setting 'channel_layout' to value '0x4'
[graph_0_in_1_0 @ 000002115beb9180] tb:1/32000 samplefmt:s32 samplerate:32000 chlayout:0x4
[graph_0_in_2_0 @ 000002115beb8bc0] Setting 'time_base' to value '1/32000'
[graph_0_in_2_0 @ 000002115beb8bc0] Setting 'sample_rate' to value '32000'
[graph_0_in_2_0 @ 000002115beb8bc0] Setting 'sample_fmt' to value 's32'
[graph_0_in_2_0 @ 000002115beb8bc0] Setting 'channel_layout' to value '0x4'
[graph_0_in_2_0 @ 000002115beb8bc0] tb:1/32000 samplefmt:s32 samplerate:32000 chlayout:0x4
[graph_0_in_3_0 @ 000002115beb8600] Setting 'time_base' to value '1/32000'
[graph_0_in_3_0 @ 000002115beb8600] Setting 'sample_rate' to value '32000'
[graph_0_in_3_0 @ 000002115beb8600] Setting 'sample_fmt' to value 's32'
[graph_0_in_3_0 @ 000002115beb8600] Setting 'channel_layout' to value '0x4'
[graph_0_in_3_0 @ 000002115beb8600] tb:1/32000 samplefmt:s32 samplerate:32000 chlayout:0x4
[graph_0_in_4_0 @ 000002115beabc40] Setting 'time_base' to value '1/32000'
[graph_0_in_4_0 @ 000002115beabc40] Setting 'sample_rate' to value '32000'
[graph_0_in_4_0 @ 000002115beabc40] Setting 'sample_fmt' to value 's32'
[graph_0_in_4_0 @ 000002115beabc40] Setting 'channel_layout' to value '0x4'
[graph_0_in_4_0 @ 000002115beabc40] tb:1/32000 samplefmt:s32 samplerate:32000 chlayout:0x4
[graph_0_in_5_0 @ 000002115bea5780] Setting 'time_base' to value '1/32000'
[graph_0_in_5_0 @ 000002115bea5780] Setting 'sample_rate' to value '32000'
[graph_0_in_5_0 @ 000002115bea5780] Setting 'sample_fmt' to value 's32'
[graph_0_in_5_0 @ 000002115bea5780] Setting 'channel_layout' to value '0x4'
[graph_0_in_5_0 @ 000002115bea5780] tb:1/32000 samplefmt:s32 samplerate:32000 chlayout:0x4
[graph_0_in_6_0 @ 000002115bf219c0] Setting 'time_base' to value '1/32000'
[graph_0_in_6_0 @ 000002115bf219c0] Setting 'sample_rate' to value '32000'
[graph_0_in_6_0 @ 000002115bf219c0] Setting 'sample_fmt' to value 's32'
[graph_0_in_6_0 @ 000002115bf219c0] Setting 'channel_layout' to value '0x4'
[graph_0_in_6_0 @ 000002115bf219c0] tb:1/32000 samplefmt:s32 samplerate:32000 chlayout:0x4
[graph_0_in_7_0 @ 000002115bf21200] Setting 'time_base' to value '1/32000'
[graph_0_in_7_0 @ 000002115bf21200] Setting 'sample_rate' to value '32000'
[graph_0_in_7_0 @ 000002115bf21200] Setting 'sample_fmt' to value 's32'
[graph_0_in_7_0 @ 000002115bf21200] Setting 'channel_layout' to value '0x4'
[graph_0_in_7_0 @ 000002115bf21200] tb:1/32000 samplefmt:s32 samplerate:32000 chlayout:0x4
[format_out_0_0 @ 000002115a0f1940] Setting 'sample_fmts' to value 's32'
[Parsed_join_0 @ 000002115beba2c0] auto-inserting filter 'auto_resampler_0' between the filter 'graph_0_in_0_0' and the filter 'Parsed_join_0'
[Parsed_join_0 @ 000002115beba2c0] auto-inserting filter 'auto_resampler_1' between the filter 'graph_0_in_1_0' and the filter 'Parsed_join_0'
[Parsed_join_0 @ 000002115beba2c0] auto-inserting filter 'auto_resampler_2' between the filter 'graph_0_in_2_0' and the filter 'Parsed_join_0'
[Parsed_join_0 @ 000002115beba2c0] auto-inserting filter 'auto_resampler_3' between the filter 'graph_0_in_3_0' and the filter 'Parsed_join_0'
[Parsed_join_0 @ 000002115beba2c0] auto-inserting filter 'auto_resampler_4' between the filter 'graph_0_in_4_0' and the filter 'Parsed_join_0'
[Parsed_join_0 @ 000002115beba2c0] auto-inserting filter 'auto_resampler_5' between the filter 'graph_0_in_5_0' and the filter 'Parsed_join_0'
[Parsed_join_0 @ 000002115beba2c0] auto-inserting filter 'auto_resampler_6' between the filter 'graph_0_in_6_0' and the filter 'Parsed_join_0'
[Parsed_join_0 @ 000002115beba2c0] auto-inserting filter 'auto_resampler_7' between the filter 'graph_0_in_7_0' and the filter 'Parsed_join_0'
[format_out_0_0 @ 000002115a0f1940] auto-inserting filter 'auto_resampler_8' between the filter 'Parsed_join_0' and the filter 'format_out_0_0'
[AVFilterGraph @ 000002115be4f740] query_formats: 11 queried, 3 merged, 27 already done, 0 delayed
[auto_resampler_0 @ 000002115a0f3f40] picking s32p out of 6 ref:s32
[auto_resampler_0 @ 000002115a0f3f40] [SWR @ 000002115bec2dc0] Using s32p internally between filters
[auto_resampler_0 @ 000002115a0f3f40] ch:1 chl:mono fmt:s32 r:32000Hz -> ch:1 chl:mono fmt:s32p r:32000Hz
[auto_resampler_1 @ 000002115bed9f80] [SWR @ 000002115bf21f80] Using s32p internally between filters
[auto_resampler_1 @ 000002115bed9f80] ch:1 chl:mono fmt:s32 r:32000Hz -> ch:1 chl:mono fmt:s32p r:32000Hz
[auto_resampler_2 @ 000002115beda200] [SWR @ 000002115bf36f40] Using s32p internally between filters
[auto_resampler_2 @ 000002115beda200] ch:1 chl:mono fmt:s32 r:32000Hz -> ch:1 chl:mono fmt:s32p r:32000Hz
[auto_resampler_3 @ 000002115beda4c0] [SWR @ 000002115bf4c000] Using s32p internally between filters
[auto_resampler_3 @ 000002115beda4c0] ch:1 chl:mono fmt:s32 r:32000Hz -> ch:1 chl:mono fmt:s32p r:32000Hz
[auto_resampler_4 @ 000002115beda780] [SWR @ 000002115bf60fc0] Using s32p internally between filters
[auto_resampler_4 @ 000002115beda780] ch:1 chl:mono fmt:s32 r:32000Hz -> ch:1 chl:mono fmt:s32p r:32000Hz
[auto_resampler_5 @ 000002115bedba40] [SWR @ 000002115bf75fc0] Using s32p internally between filters
[auto_resampler_5 @ 000002115bedba40] ch:1 chl:mono fmt:s32 r:32000Hz -> ch:1 chl:mono fmt:s32p r:32000Hz
[auto_resampler_6 @ 000002115bedcb00] [SWR @ 000002115bf8af80] Using s32p internally between filters
[auto_resampler_6 @ 000002115bedcb00] ch:1 chl:mono fmt:s32 r:32000Hz -> ch:1 chl:mono fmt:s32p r:32000Hz
[auto_resampler_7 @ 000002115bedcc00] [SWR @ 000002115bf9ff80] Using s32p internally between filters
[auto_resampler_7 @ 000002115bedcc00] ch:1 chl:mono fmt:s32 r:32000Hz -> ch:1 chl:mono fmt:s32p r:32000Hz
[Parsed_join_0 @ 000002115beba2c0] mappings: 1.FC => FL 2.FC => FR 0.FC => FC 3.FC => BL 4.FC => BR 5.FC => BC 6.FC => SL 7.FC => SR
[auto_resampler_8 @ 000002115bedc600] [SWR @ 000002115bfb5f80] Using s32p internally between filters
[auto_resampler_8 @ 000002115bedc600] ch:8 chl:octagonal fmt:s32p r:32000Hz -> ch:8 chl:octagonal fmt:s32 r:32000Hz
Output #0, wav, to 'output.wav':
  Metadata:
    ISFT            : Lavf58.42.101
    Stream #0:0, 0, 1/32000: Audio: pcm_s32le ([1][0][0][0] / 0x0001), 32000 Hz, octagonal, s32, 8192 kb/s (default)
    Metadata:
      encoder         : Lavc58.82.100 pcm_s32le
[out_0_0 @ 000002115a0ee500] EOF on sink link out_0_0:default.
No more output streams to write to, finishing.
size=   53280kB time=00:00:53.28 bitrate=8192.0kbits/s speed= 282x
video:0kB audio:53280kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.000187%
Input file #0 (one.wav):
  Input stream #0:0 (audio): 1665 packets read (6819840 bytes); 1665 frames decoded (1704960 samples);
  Total: 1665 packets (6819840 bytes) demuxed
Input file #1 (two.wav):
  Input stream #1:0 (audio): 1665 packets read (6819840 bytes); 1665 frames decoded (1704960 samples);
  Total: 1665 packets (6819840 bytes) demuxed
Input file #2 (three.wav):
  Input stream #2:0 (audio): 1665 packets read (6819840 bytes); 1665 frames decoded (1704960 samples);
  Total: 1665 packets (6819840 bytes) demuxed
Input file #3 (four.wav):
  Input stream #3:0 (audio): 1665 packets read (6819840 bytes); 1665 frames decoded (1704960 samples);
  Total: 1665 packets (6819840 bytes) demuxed
Input file #4 (five.wav):
  Input stream #4:0 (audio): 1665 packets read (6819840 bytes); 1665 frames decoded (1704960 samples);
  Total: 1665 packets (6819840 bytes) demuxed
Input file #5 (six.wav):
  Input stream #5:0 (audio): 1665 packets read (6819840 bytes); 1665 frames decoded (1704960 samples);
  Total: 1665 packets (6819840 bytes) demuxed
Input file #6 (seven.wav):
  Input stream #6:0 (audio): 1665 packets read (6819840 bytes); 1665 frames decoded (1704960 samples);
  Total: 1665 packets (6819840 bytes) demuxed
Input file #7 (eight.wav):
  Input stream #7:0 (audio): 1665 packets read (6819840 bytes); 1665 frames decoded (1704960 samples);
  Total: 1665 packets (6819840 bytes) demuxed
Output file #0 (output.wav):
  Output stream #0:0 (audio): 1665 frames encoded (1704960 samples); 1665 packets muxed (54558720 bytes);
  Total: 1665 packets (54558720 bytes) muxed
13320 frames successfully decoded, 0 decoding errors
[AVIOContext @ 000002115be9d100] Statistics: 4 seeks, 211 writeouts
[AVIOContext @ 000002115a0f7bc0] Statistics: 6885420 bytes read, 1 seeks
[AVIOContext @ 000002115a10ab40] Statistics: 6885420 bytes read, 1 seeks
[AVIOContext @ 000002115a14a480] Statistics: 6885420 bytes read, 1 seeks
[AVIOContext @ 000002115a14bc40] Statistics: 6885420 bytes read, 1 seeks
[AVIOContext @ 000002115a19c9c0] Statistics: 6885478 bytes read, 1 seeks
[AVIOContext @ 000002115a19ccc0] Statistics: 6885478 bytes read, 1 seeks
[AVIOContext @ 000002115bda8c40] Statistics: 6885478 bytes read, 1 seeks
[AVIOContext @ 000002115bda2780] Statistics: 6885478 bytes read, 1 seeks