[FFmpeg-user] amix: Hard limit for number of inputs?
Reino Wijnsma
rwijnsma at xs4all.nl
Tue Jul 16 16:02:26 EEST 2019
Hello ffmpeg-user,
About 7 years ago I've used Audacity to assemble the soundtrack of the videogame No One Lives Forever 2. See https://www.youtube.com/watch?v=4Y3aKcQ0HK4 for example.
The soundtrack comprised of lots of small segments that can all dynamically be loaded by the videogame.
A year later I've assembled the soundtrack once more, but this time with Avisynth. See the attached 'SIBERIA.avs' for example.
Now I wanted to see if ffmpeg is up for the task. Just for fun.
FFmpeg used:
ffmpeg version N-94137-g89b9690-Reino Copyright (c) 2000-2019 the FFmpeg developers
built with gcc 8.3.0 (GCC)
configuration: --arch=x86 --target-os=mingw32 --cross-prefix=/cygdrive/m/ffmpeg-windows-build-helpers-master/ffmpeg_local_builds/sandbox/cross_compilers/mingw-w64-i686/bin/i686-w64-mingw32- --pkg-config=pkg-config --pkg-config-flags=--static --extra-version=Reino --enable-gray --enable-version3 --disable-debug --disable-doc --disable-htmlpages --disable-manpages --disable-podpages --disable-txtpages --disable-w32threads --enable-avisynth --enable-frei0r --enable-filter=frei0r --enable-gmp --enable-gpl --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --extra-cflags=-DCACA_STATIC --enable-libfdk-aac --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libilbc --enable-libmp3lame --enable-libmysofa --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenmpt --enable-libopus --enable-librubberband --enable-libsnappy --enable-libsoxr
--enable-libspeex --enable-libtheora --enable-libtwolame --extra-cflags=-DLIBTWOLAME_STATIC --enable-libvidstab --enable-libvmaf --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzvbi --enable-mbedtls --extra-cflags='-march=pentium3' --extra-cflags='-mtune=athlon-xp' --extra-cflags=-O2 --extra-cflags='-mfpmath=sse' --extra-cflags=-msse --enable-static --disable-shared --prefix=/cygdrive/m/ffmpeg-windows-build-helpers-master/ffmpeg_local_builds/sandbox/cross_compilers/mingw-w64-i686/i686-w64-mingw32
libavutil 56. 30.100 / 56. 30.100
libavcodec 58. 53.100 / 58. 53.100
libavformat 58. 28.101 / 58. 28.101
libavdevice 58. 7.100 / 58. 7.100
libavfilter 7. 55.100 / 7. 55.100
libswscale 5. 4.101 / 5. 4.101
libswresample 3. 4.100 / 3. 4.100
libpostproc 55. 4.100 / 55. 4.100
The soundtrack contains an "explore", "warning" and "combat" section. I'll do the "explore" section first, which is 'SIBERIAE{1-29}.WAV'.
ffmpeg.exe -i SIBERIAE1.WAV -i SIBERIAE2.WAV -i SIBERIAE3.WAV -i SIBERIAE4.WAV -i SIBERIAE5.WAV -i SIBERIAE6.WAV -i SIBERIAE7.WAV -i SIBERIAE8.WAV -i SIBERIAE9.WAV -i SIBERIAE10.WAV -i SIBERIAE11.WAV -i SIBERIAE12.WAV -i SIBERIAE13.WAV -i SIBERIAE14.WAV -i SIBERIAE15.WAV -i SIBERIAE16.WAV -i SIBERIAE17.WAV -i SIBERIAE18.WAV -i SIBERIAE19.WAV -i SIBERIAE20.WAV -i SIBERIAE21.WAV -i SIBERIAE22.WAV -i SIBERIAE23.WAV -i SIBERIAE24.WAV -i SIBERIAE25.WAV -i SIBERIAE26.WAV -i SIBERIAE27.WAV -i SIBERIAE28.WAV -i SIBERIAE29.WAV -filter_complex
"[1]adelay=158792S|158792S[E2];[2]adelay=291139S|291139S[E3];[3]adelay=423476S|423476S[E4];[4]adelay=555820S|555820S[E5];[5]adelay=714633S|714633S[E6];[6]adelay=873439S|873439S[E7];[7]adelay=1058736S|1058736S[E8];[8]adelay=1244019S|1244019S[E9];[9]adelay=1376339S|1376339S[E10];[10]adelay=1508682S|1508682S[E11];[11]adelay=1667496S|1667496S[E12];[12]adelay=1826306S|1826306S[E13];[13]adelay=1932181S|1932181S[E14];[14]adelay=2118076S|2118076S[E15];[15]adelay=2255399S|2255399S[E16];[16]adelay=2364348S|2364348S[E17];[17]adelay=2499655S|2499655S[E18];[18]adelay=2587883S|2587883S[E19];[19]adelay=2720226S|2720226S[E20];[20]adelay=2852568S|2852568S[E21];[21]adelay=2984913S|2984913S[E22];[22]adelay=3073138S|3073138S[E23];[23]adelay=3161367S|3161367S[E24];[24]adelay=3249594S|3249594S[E25];[25]adelay=3336742S|3336742S[E26];[26]adelay=3421112S|3421112S[E27];[27]adelay=3576621S|3576621S[E28];[28]adelay=3788369S|3788369S[E29];[0][E2][E3][E4][E5][E6][E7][E8][E9][E10][E11][E12][E13][E14][E15][E16][E17][E18][E19][E20][E21][E22][E23][E24][E25][E26][E27][E28][E29]amix=inputs=29"
-f null NUL
Input #0, wav, from 'SIBERIAE1.WAV':
Duration: 00:00:09.64, bitrate: 127 kb/s
Stream #0:0: Audio: mp3 (U[0][0][0] / 0x0055), 44100 Hz, stereo, fltp, 128 kb/s
[...]
Input #28, wav, from 'SIBERIAE29.WAV':
Duration: 00:00:04.83, bitrate: 127 kb/s
Stream #28:0: Audio: mp3 (U[0][0][0] / 0x0055), 44100 Hz, stereo, fltp, 128 kb/s
Stream mapping:
Stream #0:0 (mp3float) -> amix:input0
Stream #1:0 (mp3float) -> adelay
[...]
Stream #28:0 (mp3float) -> adelay
amix -> Stream #0:0 (pcm_s16le)
Press [q] to stop, [?] for help
Output #0, null, to 'NUL':
Metadata:
encoder : Lavf58.28.101
Stream #0:0: Audio: pcm_s16le, 44100 Hz, stereo, s16, 1411 kb/s (default)
Metadata:
encoder : Lavc58.53.100 pcm_s16le
size=N/A time=00:01:30.74 bitrate=N/A speed=26.3x
video:0kB audio:15632kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
(as you can see the segments are actually mp3 disguised as wav)
With this command I'd first like to know the duration; 00:01:30.74.
Next I'll use this for the "dropout_transition" parameter and do a "volumedetect":
ffmpeg.exe [...]amix=inputs=29:dropout_transition=90.74,volumedetect" -f null NUL
[...]
[Parsed_volumedetect_29 @ 055e98c0] n_samples: 8003418
[Parsed_volumedetect_29 @ 055e98c0] mean_volume: -62.2 dB
[Parsed_volumedetect_29 @ 055e98c0] max_volume: -39.8 dB
[Parsed_volumedetect_29 @ 055e98c0] histogram_39db: 3
[Parsed_volumedetect_29 @ 055e98c0] histogram_40db: 14
[Parsed_volumedetect_29 @ 055e98c0] histogram_41db: 33
[Parsed_volumedetect_29 @ 055e98c0] histogram_42db: 75
[Parsed_volumedetect_29 @ 055e98c0] histogram_43db: 163
[Parsed_volumedetect_29 @ 055e98c0] histogram_44db: 331
[Parsed_volumedetect_29 @ 055e98c0] histogram_45db: 985
[Parsed_volumedetect_29 @ 055e98c0] histogram_46db: 2395
[Parsed_volumedetect_29 @ 055e98c0] histogram_47db: 4637
Finally I crank up the volume with the "max_volume" result and pipe or write/encode the endresult:
ffmpeg.exe [...]amix=inputs=29:dropout_transition=90.74,volume=39.8" -f wav -
So far so good. Now for the entire Siberia soundtrack.
The "explore" section was 29 inputs. The entire Siberia soundtrack is 79 inputs.
ffmpeg.exe -i SIBERIAE1.WAV -i SIBERIAE2.WAV -i SIBERIAE3.WAV -i SIBERIAE4.WAV -i SIBERIAE5.WAV -i SIBERIAE6.WAV -i SIBERIAE7.WAV -i SIBERIAE8.WAV -i SIBERIAE9.WAV -i SIBERIAE10.WAV -i SIBERIAE11.WAV -i SIBERIAE12.WAV -i SIBERIAE13.WAV -i SIBERIAE14.WAV -i SIBERIAE15.WAV -i SIBERIAE16.WAV -i SIBERIAE17.WAV -i SIBERIAE18.WAV -i SIBERIAE19.WAV -i SIBERIAE20.WAV -i SIBERIAE21.WAV -i SIBERIAE22.WAV -i SIBERIAE23.WAV -i SIBERIAE24.WAV -i SIBERIAE25.WAV -i SIBERIAE26.WAV -i SIBERIAE27.WAV -i SIBERIAE28.WAV -i SIBERIAE29.WAV -i TRANSEWSTR100.WAV -i SIBERIAW1.WAV -i SIBERIAW2.WAV -i SIBERIAW3.WAV -i SIBERIAW4.WAV -i SIBERIAW5.WAV -i SIBERIAW6.WAV -i SIBERIAW7.WAV -i SIBERIAW8.WAV -i SIBERIAW9.WAV -i SIBERIAW10.WAV -i SIBERIAW11.WAV -i SIBERIAW12.WAV -i SIBERIAW13.WAV -i SIBERIAW14.WAV -i SIBERIAW15.WAV -i SIBERIAW16.WAV -i SIBERIAW17.WAV -i SIBERIAW18.WAV -i SIBERIAW19.WAV -i SIBERIAW20.WAV -i SIBERIAW21.WAV -i SIBERIAW22.WAV -i TRANSWE19.WAV -i SIBERIAC1.WAV -i SIBERIAC2.WAV -i
SIBERIAC3.WAV -i SIBERIAC4.WAV -i SIBERIAC5.WAV -i SIBERIAC6.WAV -i SIBERIAC7.WAV -i SIBERIAC8.WAV -i SIBERIAC9.WAV -i SIBERIAC10.WAV -i SIBERIAC11.WAV -i SIBERIAC12.WAV -i SIBERIAC13.WAV -i SIBERIAC14.WAV -i SIBERIAC15.WAV -i SIBERIAC16.WAV -i SIBERIAC17.WAV -i SIBERIAC18.WAV -i SIBERIAC19.WAV -i SIBERIAC20.WAV -i SIBERIAC21.WAV -i SIBERIAC22.WAV -i SIBERIAC23.WAV -i SIBERIAC24.WAV -i SIBERIAC25.WAV -i TRANSCS21.WAV -filter_complex
"[1]adelay=158792S|158792S[E2];[2]adelay=291139S|291139S[E3];[3]adelay=423476S|423476S[E4];[4]adelay=555820S|555820S[E5];[5]adelay=714633S|714633S[E6];[6]adelay=873439S|873439S[E7];[7]adelay=1058736S|1058736S[E8];[8]adelay=1244019S|1244019S[E9];[9]adelay=1376339S|1376339S[E10];[10]adelay=1508682S|1508682S[E11];[11]adelay=1667496S|1667496S[E12];[12]adelay=1826306S|1826306S[E13];[13]adelay=1932181S|1932181S[E14];[14]adelay=2118076S|2118076S[E15];[15]adelay=2255399S|2255399S[E16];[16]adelay=2364348S|2364348S[E17];[17]adelay=2499655S|2499655S[E18];[18]adelay=2587883S|2587883S[E19];[19]adelay=2720226S|2720226S[E20];[20]adelay=2852568S|2852568S[E21];[21]adelay=2984913S|2984913S[E22];[22]adelay=3073138S|3073138S[E23];[23]adelay=3161367S|3161367S[E24];[24]adelay=3249594S|3249594S[E25];[25]adelay=3336742S|3336742S[E26];[26]adelay=3421112S|3421112S[E27];[27]adelay=3576621S|3576621S[E28];[28]adelay=3788369S|3788369S[E29];[29]adelay=3787479|3787479S[EW100];[30]adelay=3841308S|3841308S[W1];[31]adelay=4089467S|4089467S[W2];[32]adelay=4337597S|4337597S[W3];[33]adelay=4585740S|4585740S[W4];[34]adelay=4751180S|4751180S[W5];[35]adelay=4916595S|4916595S[W6];[36]adelay=5040665S|5040665S[W7];[37]adelay=5206096S|5206096S[W8];[38]adelay=5309485S|5309485S[W9];[39]adelay=5412881S|5412881S[W10];[40]adelay=5516287S|5516287S[W11];[41]adelay=5619668S|5619668S[W12];[42]adelay=5785089S|5785089S[W13];[43]adelay=5950523S|5950523S[W14];[44]adelay=6033235S|6033235S[W15];[45]adelay=6198660S|6198660S[W16];[46]adelay=6364091S|6364091S[W17];[47]adelay=6446814S|6446814S[W18];[48]adelay=6598676S|6598676S[W19];[49]adelay=6722118S|6722118S[W20];[50]adelay=6872561S|6872561S[W21];[51]adelay=7038663S|7038663S[W22];[52]adelay=7204260S|7204260S[WE19];[53]adelay=7286129S|7286129S[C1];[54]adelay=7534279S|7534279S[C2];[55]adelay=7783363S|7783363S[C3];[56]adelay=8030562S|8030562S[C4];[57]adelay=8195988S|8195988S[C5];[58]adelay=8361416S|8361416S[C6];[59]adelay=8485486S|8485486S[C7];[60]adelay=8650917S|8650917S[C8];[61]adelay=8754307S|8754307S[C9];[62]adelay=8857700S|8857700S[C10];[63]adelay=8961094S|8961094S[C11];[64]adelay=9064486S|9064486S[C12];[65]adelay=9271272S|9271272S[C13];[66]adelay=9436697S|9436697S[C14];[67]adelay=9519413S|9519413S[C15];[68]adelay=9726192S|9726192S[C16];[69]adelay=9850266S|9850266S[C17];[70]adelay=9932983S|9932983S[C18];[71]adelay=10181124S|10181124S[C19];[72]adelay=10429267S|10429267S[C20];[73]adelay=10677408S|10677408S[C21];[74]adelay=10842834S|10842834S[C22];[75]adelay=10946226S|10946226S[C23];[76]adelay=11049615S|11049615S[C24];[77]adelay=11153012S|11153012S[C25];[78]adelay=11401044S|11401044S[CS21];[0][E2][E3][E4][E5][E6][E7][E8][E9][E10][E11][E12][E13][E14][E15][E16][E17][E18][E19][E20][E21][E22][E23][E24][E25][E26][E27][E28][E29][EW100][W1][W2][W3][W4][W5][W6][W7][W8][W9][W10][W11][W12][W13][W14][W15][W16][W17][W18][W19][W20][W21][W22][WE19][C1][C2][C3][C4][C5][C6][C7][C8][C9][C10][C11][C12][C13][C14][C15][C16][C17][C18][C19][C20][C21][C22][C23][C24][C25][CS21]amix=inputs=79"
-f null NUL
Input #0, wav, from 'SIBERIAE1.WAV':
Duration: 00:00:09.64, bitrate: 127 kb/s
Stream #0:0: Audio: mp3 (U[0][0][0] / 0x0055), 44100 Hz, stereo, fltp, 128 kb/s
[...]
Input #78, wav, from 'TRANSCS21.WAV':
Duration: 00:00:11.76, bitrate: 127 kb/s
Stream #78:0: Audio: mp3 (U[0][0][0] / 0x0055), 44100 Hz, stereo, fltp, 128 kb/s
Stream mapping:
Stream #0:0 (mp3float) -> amix:input0
Stream #1:0 (mp3float) -> adelay
[...]
Stream #78:0 (mp3float) -> adelay
amix -> Stream #0:0 (pcm_s16le)
Press [q] to stop, [?] for help
Output #0, null, to 'NUL':
Metadata:
encoder : Lavf58.28.101
Stream #0:0: Audio: pcm_s16le, 44100 Hz, stereo, s16, 1411 kb/s (default)
Metadata:
encoder : Lavc58.53.100 pcm_s16le
size=N/A time=01:03:12.31 bitrate=N/A speed= 126x
video:0kB audio:653285kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
This is where things go wrong. After having processed time=00:04:00.00 (4 minutes) or so the process speed, as well the alleged time, suddenly go through the roof.
It reports a duration of over an hour, while it should've been 00:04:30.67.
Is there a limit to the amount of inputs the amix filter can work with, or is there something else going on here?
I've uploaded the segments here for testing: https://rwijnsma.home.xs4all.nl/files/temp/SIBERIA.7z
Thank you.
-- Reino
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