[FFmpeg-user] FFmpeg doesn't stop after it has written the correct output file

[Michael Koch]

Hello all,

I just created a special effect which shows several optical sound 
tracks, like in cine film.
The output video is perfectly ok and has the correct length 20s. But 
FFmpeg doesn't stop after it has written the output file. I have to 
terminate it with ctrl-c, and I don't understand why.

The problem can be reproduced with some audio input files, but not with 
all.
This input file can be used for reproducing:

ffmpeg -f lavfi -i "sine=1k:b=2,channelmap=0|0" -t 20 -y sine.mp3

This is the command line for the special effect:

ffmpeg -i sine.mp3 -lavfi 
"asplit=4[a0][a1][a2][a3];[a0]asplit[b0][c0];[a1]adelay=0.05:all=1,volume='gt(t,5)':eval=frame,asplit[b1][c1];[a2]adelay=0.1:all=1,volume='gt(t,10)':eval=frame,asplit[b2][c2];[a3]adelay=0.15:all=1,volume='gt(t,15)':eval=frame,asplit[b3][c3];[b0]showwaves=mode=cline:split_channels=true:s=1080x480:colors=white[v0];[b1]showwaves=mode=cline:split_channels=true:s=1080x480:colors=white[v1];[b2]showwaves=mode=cline:split_channels=true:s=1080x480:colors=white[v2];[b3]showwaves=mode=cline:split_channels=true:s=1080x480:colors=white[v3];[v0][v1][v2][v3]vstack=4,transpose;[c0][c1][c2][c3]amix=4" 
-y out.mp4

The console outputs are below.

Michael



C:\Users\astro\Desktop>ffmpeg -f lavfi -i "sine=1k:b=2,channelmap=0|0" 
-t 20 -y sine.mp3
ffmpeg version 2021-03-09-git-c35e456f54-essentials_build-www.gyan.dev 
Copyright (c) 2000-2021 the FFmpeg developers
   built with gcc 10.2.0 (Rev6, Built by MSYS2 project)
   configuration: --enable-gpl --enable-version3 --enable-static 
--disable-w32threads --disable-autodetect --enable-fontconfig 
--enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp 
--enable-lzma --enable-zlib --enable-libsrt --enable-libssh 
--enable-libzmq --enable-avisynth --enable-sdl2 --enable-libwebp 
--enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom 
--enable-libopenjpeg --enable-libvpx --enable-libass 
--enable-libfreetype --enable-libfribidi --enable-libvidstab 
--enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm 
--enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc 
--enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libgme 
--enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame 
--enable-libtheora --enable-libvo-amrwbenc --enable-libgsm 
--enable-libopencore-amrnb --enable-libopus --enable-libspeex 
--enable-libvorbis --enable-librubberband
   libavutil      56. 67.100 / 56. 67.100
   libavcodec     58.129.100 / 58.129.100
   libavformat    58. 71.100 / 58. 71.100
   libavdevice    58. 12.100 / 58. 12.100
   libavfilter     7.109.100 /  7.109.100
   libswscale      5.  8.100 /  5.  8.100
   libswresample   3.  8.100 /  3.  8.100
   libpostproc    55.  8.100 / 55.  8.100
Input #0, lavfi, from 'sine=1k:b=2,channelmap=0|0':
   Duration: N/A, start: 0.000000, bitrate: 1411 kb/s
   Stream #0:0: Audio: pcm_s16le, 44100 Hz, stereo, s16, 1411 kb/s
Stream mapping:
   Stream #0:0 -> #0:0 (pcm_s16le (native) -> mp3 (libmp3lame))
Press [q] to stop, [?] for help
Output #0, mp3, to 'sine.mp3':
   Metadata:
     TSSE            : Lavf58.71.100
   Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p
     Metadata:
       encoder         : Lavc58.129.100 libmp3lame
size=     313kB time=00:00:19.98 bitrate= 128.4kbits/s speed= 120x
video:0kB audio:313kB subtitle:0kB other streams:0kB global headers:0kB 
muxing overhead: 0.078921%

C:\Users\astro\Desktop>ffmpeg -i sine.mp3 -lavfi 
"asplit=4[a0][a1][a2][a3];[a0]asplit[b0][c0];[a1]adelay=0.05:all=1,volume='gt(t,5)':eval=frame,asplit[b1][c1];[a2]adelay=0.1:all=1,volume='gt(t,10)':eval=frame,asplit[b2][c2];[a3]adelay=0.15:all=1,volume='gt(t,15)':eval=frame,asplit[b3][c3];[b0]showwaves=mode=cline:split_channels=true:s=1080x480:colors=white[v0];[b1]showwaves=mode=cline:split_channels=true:s=1080x480:colors=white[v1];[b2]showwaves=mode=cline:split_channels=true:s=1080x480:colors=white[v2];[b3]showwaves=mode=cline:split_channels=true:s=1080x480:colors=white[v3];[v0][v1][v2][v3]vstack=4,transpose;[c0][c1][c2][c3]amix=4" 
-y out.mp4
ffmpeg version 2021-03-09-git-c35e456f54-essentials_build-www.gyan.dev 
Copyright (c) 2000-2021 the FFmpeg developers
   built with gcc 10.2.0 (Rev6, Built by MSYS2 project)
   configuration: --enable-gpl --enable-version3 --enable-static 
--disable-w32threads --disable-autodetect --enable-fontconfig 
--enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp 
--enable-lzma --enable-zlib --enable-libsrt --enable-libssh 
--enable-libzmq --enable-avisynth --enable-sdl2 --enable-libwebp 
--enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom 
--enable-libopenjpeg --enable-libvpx --enable-libass 
--enable-libfreetype --enable-libfribidi --enable-libvidstab 
--enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm 
--enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc 
--enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libgme 
--enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame 
--enable-libtheora --enable-libvo-amrwbenc --enable-libgsm 
--enable-libopencore-amrnb --enable-libopus --enable-libspeex 
--enable-libvorbis --enable-librubberband
   libavutil      56. 67.100 / 56. 67.100
   libavcodec     58.129.100 / 58.129.100
   libavformat    58. 71.100 / 58. 71.100
   libavdevice    58. 12.100 / 58. 12.100
   libavfilter     7.109.100 /  7.109.100
   libswscale      5.  8.100 /  5.  8.100
   libswresample   3.  8.100 /  3.  8.100
   libpostproc    55.  8.100 / 55.  8.100
Input #0, mp3, from 'sine.mp3':
   Metadata:
     encoder         : Lavf58.71.100
   Duration: 00:00:20.04, start: 0.025057, bitrate: 128 kb/s
   Stream #0:0: Audio: mp3, 44100 Hz, stereo, fltp, 128 kb/s
     Metadata:
       encoder         : Lavc58.12
Stream mapping:
   Stream #0:0 (mp3float) -> asplit
   transpose -> Stream #0:0 (libx264)
   amix -> Stream #0:1 (aac)
Press [q] to stop, [?] for help
[libx264 @ 00000247f8921ac0] using SAR=1/1
[libx264 @ 00000247f8921ac0] using cpu capabilities: MMX2 SSE2Fast SSSE3 
SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 00000247f8921ac0] profile High 4:4:4 Predictive, level 4.0, 
4:4:4, 8-bit
[libx264 @ 00000247f8921ac0] 264 - core 161 r3048 b86ae3c - H.264/MPEG-4 
AVC codec - Copyleft 2003-2021 - http://www.videolan.org/x264.html - 
options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 
psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 
8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=4 threads=12 
lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 
bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 
b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 
keyint_min=20 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf 
mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 
aq=1:1.00
Output #0, mp4, to 'out.mp4':
   Metadata:
     encoder         : Lavf58.71.100
   Stream #0:0: Video: h264 (avc1 / 0x31637661), yuv444p(tv, 
progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 20.42 fps, 15680 tbn
     Metadata:
       encoder         : Lavc58.129.100 libx264
     Side data:
       cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
   Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, 
fltp, 128 kb/s
     Metadata:
       encoder         : Lavc58.129.100 aac
frame=  408 fps= 34 q=-1.0 Lsize=   10242kB time=00:00:19.96 
bitrate=4201.6kbits/s speed=1.66x
video:10100kB audio:128kB subtitle:0kB other streams:0kB global 
headers:0kB muxing overhead: 0.134918%
[libx264 @ 00000247f8921ac0] frame I:2     Avg QP:20.14  size: 59526
[libx264 @ 00000247f8921ac0] frame P:115   Avg QP:26.20  size: 39985
[libx264 @ 00000247f8921ac0] frame B:291   Avg QP:33.51  size: 19329
[libx264 @ 00000247f8921ac0] consecutive B-frames:  2.2%  7.8%  0.7% 89.2%
[libx264 @ 00000247f8921ac0] mb I  I16..4: 16.2% 72.5% 11.3%
[libx264 @ 00000247f8921ac0] mb P  I16..4:  0.0%  0.2%  0.3% P16..4:  
6.0%  4.1%  3.4%  0.0%  0.0%    skip:86.0%
[libx264 @ 00000247f8921ac0] mb B  I16..4:  0.0%  0.0%  1.1% B16..8:  
5.5%  1.7%  2.1%  direct: 2.7%  skip:86.9%  L0:42.1% L1:42.0% BI:15.9%
[libx264 @ 00000247f8921ac0] 8x8 transform intra:29.6% inter:16.4%
[libx264 @ 00000247f8921ac0] coded y,u,v intra: 56.3% 0.0% 0.0% inter: 
6.8% 0.0% 0.0%
[libx264 @ 00000247f8921ac0] i16 v,h,dc,p: 98%  0%  1%  0%
[libx264 @ 00000247f8921ac0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 80%  1% 19%  
0%  0%  0%  0%  0%  0%
[libx264 @ 00000247f8921ac0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu:  7% 72% 8%  
1%  1%  1%  4%  1%  5%
[libx264 @ 00000247f8921ac0] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 00000247f8921ac0] ref P L0: 65.7%  8.8%  8.2% 17.2%
[libx264 @ 00000247f8921ac0] ref B L0: 94.1%  5.4%  0.4%
[libx264 @ 00000247f8921ac0] ref B L1: 97.3%  2.7%
[libx264 @ 00000247f8921ac0] kb/s:4140.21
[aac @ 00000247f8924e80] Qavg: 60535.746
Exiting normally, received signal 2.
Batchvorgang abbrechen (J/N)?