[FFmpeg-user] how to avoid broken pi

meex meex at rbox.me
Wed Jan 26 18:10:55 EET 2022


in a bash script i'm using ffmpeg to create a spectrogram movie and pipe 
the output to a decoder (mpv in this case, but it doesn't matter)

as expected, if the user exits mpv before ffmpeg completes, it returns a 
broke pipe error and i would like to avoid that if possible

the problem is that the terminal may refuse to accept any user input 
when this happens (this occurs ~20% of the time)

is there a way to have ffmpeg exit gracefully when the pipe is broken?

$ ffmpeg -i 'a.flac' -filter_complex 
"[0:a]showspectrum=mode=separate:color=intensity:scale=cbrt:s=1280x518[top]; 
[0:a]showwaves=s=1280x202:mode=point:colors=white[bottom]; 
[top][bottom]vstack" -map 0:a -codec:v libx264 -preset fast -crf 18 
-codec:a copy -f matroska - | mpv --no-config -- -
ffmpeg version n4.4.1 Copyright (c) 2000-2021 the FFmpeg developers
   built with gcc 11.1.0 (GCC)
   configuration: --prefix=/usr --disable-debug --disable-static 
--disable-stripping --enable-amf --enable-avisynth --enable-cuda-llvm 
--enable-lto --enable-fontconfig --enable-gmp --enable-gnutls 
--enable-gpl --enable-ladspa --enable-libaom --enable-libass 
--enable-libbluray --enable-libdav1d --enable-libdrm 
--enable-libfreetype --enable-libfribidi --enable-libgsm 
--enable-libiec61883 --enable-libjack --enable-libmfx 
--enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb 
--enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus 
--enable-libpulse --enable-librav1e --enable-librsvg --enable-libsoxr 
--enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1 
--enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvmaf 
--enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 
--enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid 
--enable-libzimg --enable-nvdec --enable-nvenc --enable-shared 
--enable-version3
   libavutil      56. 70.100 / 56. 70.100
   libavcodec     58.134.100 / 58.134.100
   libavformat    58. 76.100 / 58. 76.100
   libavdevice    58. 13.100 / 58. 13.100
   libavfilter     7.110.100 /  7.110.100
   libswscale      5.  9.100 /  5.  9.100
   libswresample   3.  9.100 /  3.  9.100
   libpostproc    55.  9.100 / 55.  9.100
Input #0, flac, from 'a.flac':
   Metadata:
     GENRE           : Soft
     TITLE           : 17th Street
     ARTIST          : 2 Good To Go
     COMMENT         : Muzik Faktry v20211226 12/26/2021
     REPLAYGAIN_REFERENCE_LOUDNESS: 89.0 dB
     REPLAYGAIN_TRACK_GAIN: -6.36 dB
     REPLAYGAIN_TRACK_PEAK: 1.00000000
     REPLAYGAIN_ALBUM_GAIN: -6.36 dB
     REPLAYGAIN_ALBUM_PEAK: 1.00000000
   Duration: 00:03:38.00, start: 0.000000, bitrate: 953 kb/s
   Stream #0:0: Audio: flac, 44100 Hz, stereo, s16
     Side data:
       replaygain: track gain - -6.360000, track peak - 0.000023, album 
gain - -6.360000, album peak - 0.000023,
Stream mapping:
   Stream #0:0 (flac) -> showspectrum
   Stream #0:0 (flac) -> showwaves
   vstack -> Stream #0:0 (libx264)
   Stream #0:0 -> #0:1 (copy)
Press [q] to stop, [?] for help
[libx264 @ 0x5627f9f5aa00] using SAR=1/1
[libx264 @ 0x5627f9f5aa00] MB rate (158760000) > level limit (16711680)
[libx264 @ 0x5627f9f5aa00] using cpu capabilities: MMX2 SSE2Fast SSSE3 
SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0x5627f9f5aa00] profile High 4:4:4 Predictive, level 6.2, 
4:4:4, 8-bit
[libx264 @ 0x5627f9f5aa00] 264 - core 163 r3060 5db6aa6 - H.264/MPEG-4 
AVC codec - Copyleft 2003-2021 - http://www.videolan.org/x264.html - 
options: cabac=1 ref=2 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=6 
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=1 keyint=250 
keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=30 rc=crf 
mbtree=1 crf=18.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 
aq=1:1.00
Output #0, matroska, to 'pipe:':
   Metadata:
     GENRE           : Soft
     TITLE           : 17th Street
     ARTIST          : 2 Good To Go
     COMMENT         : Muzik Faktry v20211226 12/26/2021
     REPLAYGAIN_REFERENCE_LOUDNESS: 89.0 dB
     REPLAYGAIN_TRACK_GAIN: -6.36 dB
     REPLAYGAIN_TRACK_PEAK: 1.00000000
     REPLAYGAIN_ALBUM_GAIN: -6.36 dB
     REPLAYGAIN_ALBUM_PEAK: 1.00000000
     encoder         : Lavf58.76.100
   Stream #0:0: Video: h264 (H264 / 0x34363248), yuv444p(progressive), 
1280x720 [SAR 1:1 DAR 16:9], q=2-31, 1k tbn (default)
     Metadata:
       encoder         : Lavc58.134.100 libx264
     Side data:
       cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
   Stream #0:1: Audio: flac ([172][241][0][0] / 0xF1AC), 44100 Hz, 
stereo, s16
     Side data:
       replaygain: track gain - -6.360000, track peak - 0.000023, album 
gain - -6.360000, album peak - 0.000023,
[file] Reading from stdin...
frame=    1 fps=0.0 q=0.0 size=       1kB time=00:00:00.74 bitrate= 
11.0kbits/s speed= 127x (+) Video --vid=1 (*) (h264 1280x720)
  (+) Audio --aid=1 (*) (flac 2ch 44100Hz)
File tags:
  Artist: 2 Good To Go
  Comment: Muzik Faktry v20211226 12/26/2021
  Genre: Soft
  Title: 17th Street
AO: [pulse] 44100Hz stereo 2ch s16
VO: [gpu] 1280x720 yuv444p
frame=   78 fps=0.0 q=28.0 size=     155kB time=00:00:01.85 bitrate= 
684.4kbits/s speed=3.65frame=  174 fps=172 q=26.0 size=     977kB 
time=00:00:03.25 bitrate=2461.8kbits/s speed=3.22frame=  279 fps=184 
q=27.0 size=    1635kB time=00:00:04.83 bitrate=2773.3kbits/s 
speed=3.19frame=  384 fps=191 q=28.0 size=    2449kB time=00:00:06.31 
bitrate=3176.2kbits/s speed=3.14frame=  496 fps=197 q=26.0 size= 
3072kB time=00:00:07.89 bitrate=3187.6kbits/s speed=3.14AV: 00:00:02 / 
00:00:06 (31%) A-V:  0.000 Cache: 4.3s/2MB

Exiting... (Quit)
av_interleaved_write_frame(): Broken pipe
Error writing trailer of pipe:: Broken pipe
frame=  530 fps=187 q=27.0 Lsize=    3259kB time=00:00:08.45 
bitrate=3158.4kbits/s speed=2.98x
video:2518kB audio:949kB subtitle:0kB other streams:0kB global 
headers:0kB muxing overhead: unknown
[libx264 @ 0x5627f9f5aa00] frame I:6     Avg QP:16.07  size: 30391
[libx264 @ 0x5627f9f5aa00] frame P:150   Avg QP:22.19  size:  9980
[libx264 @ 0x5627f9f5aa00] frame B:374   Avg QP:25.77  size:  2972
[libx264 @ 0x5627f9f5aa00] consecutive B-frames:  2.1% 10.6%  2.8% 84.5%
[libx264 @ 0x5627f9f5aa00] mb I  I16..4: 15.8% 76.1%  8.1%
[libx264 @ 0x5627f9f5aa00] mb P  I16..4:  2.1%  1.0%  4.5%  P16..4: 
4.6%  0.3%  0.2%  0.0%  0.0%    skip:87.3%
[libx264 @ 0x5627f9f5aa00] mb B  I16..4:  0.7%  0.1%  0.6%  B16..8: 
4.0%  0.5%  0.1%  direct: 0.6%  skip:93.4%  L0:57.6% L1:41.0% BI: 1.4%
[libx264 @ 0x5627f9f5aa00] 8x8 transform intra:28.0% inter:8.3%
[libx264 @ 0x5627f9f5aa00] coded y,u,v intra: 32.0% 1.4% 1.6% inter: 
0.8% 0.2% 0.2%
[libx264 @ 0x5627f9f5aa00] i16 v,h,dc,p: 66% 27%  7%  0%
[libx264 @ 0x5627f9f5aa00] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 57% 10% 32% 
0%  0%  0%  0%  0%  0%
[libx264 @ 0x5627f9f5aa00] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 29% 20% 35% 
3%  3%  2%  3%  1%  3%
[libx264 @ 0x5627f9f5aa00] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x5627f9f5aa00] ref P L0: 51.4% 48.6%
[libx264 @ 0x5627f9f5aa00] ref B L0: 86.4% 13.6%
[libx264 @ 0x5627f9f5aa00] ref B L1: 95.5%  4.5%
[libx264 @ 0x5627f9f5aa00] kb/s:2909.26
Conversion failed!


More information about the ffmpeg-user mailing list