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DTS Error when nesting `amix` filter in ffmpeg [closed]
25 août 2023, par GBathieI am trying to create an audio file that contains multiple occurrences of other samples (think of music notes), using ffmpeg.


I am using the following command :


ffmpeg -f lavfi -i 'sine=frequency=87.31:sample_rate=44100' -f lavfi -i 'sine=frequency=783.99:sample_rate=44100' -filter_complex '[0]asplit=2[s0][s1];[s0]atrim=duration=0.157[s2];[s1]atrim=duration=1.157[s3];[s2][s3]amix=inputs=2[s4];[1]atrim=duration=0.165[s5];[s4][s5]amix=inputs=2[s6]' -map '[s6]' test.mp3 -y



It generates two sine waves in place of notes, and builds a file containing the first note twice, and the second note once.
I then mix the result using two
amix
filters. I cannot use a singleamix
filter because, in practice, I have more notes that the maximum number of inputs that amix can take (1024).

The graph looks like this :



Running this commands gives me the following output, which complains about "Queue input backwards in time" :



ffmpeg version 4.2.7-0ubuntu0.1 Copyright (c) 2000-2022 the FFmpeg developers
 built with gcc 9 (Ubuntu 9.4.0-1ubuntu1~20.04.1)
 configuration: --prefix=/usr --extra-version=0ubuntu0.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-nvenc --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
 libavutil 56. 31.100 / 56. 31.100
 libavcodec 58. 54.100 / 58. 54.100
 libavformat 58. 29.100 / 58. 29.100
 libavdevice 58. 8.100 / 58. 8.100
 libavfilter 7. 57.100 / 7. 57.100
 libavresample 4. 0. 0 / 4. 0. 0
 libswscale 5. 5.100 / 5. 5.100
 libswresample 3. 5.100 / 3. 5.100
 libpostproc 55. 5.100 / 55. 5.100
Input #0, lavfi, from 'sine=frequency=87.31:sample_rate=44100':
 Duration: N/A, start: 0.000000, bitrate: 705 kb/s
 Stream #0:0: Audio: pcm_s16le, 44100 Hz, mono, s16, 705 kb/s
Input #1, lavfi, from 'sine=frequency=783.99:sample_rate=44100':
 Duration: N/A, start: 0.000000, bitrate: 705 kb/s
 Stream #1:0: Audio: pcm_s16le, 44100 Hz, mono, s16, 705 kb/s
Stream mapping:
 Stream #0:0 (pcm_s16le) -> asplit
 Stream #1:0 (pcm_s16le) -> atrim
 amix -> Stream #0:0 (libmp3lame)
Press [q] to stop, [?] for help
Output #0, mp3, to 'test.mp3':
 Metadata:
 TSSE : Lavf58.29.100
 Stream #0:0: Audio: mp3 (libmp3lame), 44100 Hz, mono, fltp (default)
 Metadata:
 encoder : Lavc58.54.100 libmp3lame
[libmp3lame @ 0x557929fb5400] Queue input is backward in time
 Last message repeated 1 times
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854774620
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775760
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775632
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775504
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775376
[libmp3lame @ 0x557929fb5400] Queue input is backward in time
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775248
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775120
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854774992
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854774864
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775760
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775632
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775504
[libmp3lame @ 0x557929fb5400] Queue input is backward in time
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775376
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775248
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775120
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854774992
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854774864
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775760
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775632
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775504
[libmp3lame @ 0x557929fb5400] Queue input is backward in time
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775376
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775248
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775120
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854774992
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854774864
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775760
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775632
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775504
[libmp3lame @ 0x557929fb5400] Queue input is backward in time
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775376
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775248
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775120
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854774992
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854774864
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775760
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775632
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775504
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775376
[mp3 @ 0x557929fb7280] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6959 >= -9223372036854775248
size= 10kB time=00:00:00.18 bitrate= 428.0kbits/s speed=22.2x 
video:0kB audio:9kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 2.361386%



Q : What is the issue, and how can I solve it ?


Note that the issue disappears if I use a single
amix
filter, but I cannot do this in practice.

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