[BUG] ffmpeg ProcessSignaled(11)

[helgehr]

Details

When trying to save a animation with gif(anim, "anim.gif") an error is thrown:

ERROR: failed process: Process(`/home/test/.julia/artifacts/7f40eeb66d90d3026ae5fb68761c263b57adb840/bin/ffmpeg -v 16 -framerate 20 -i /tmp/jl_b1XznB/%06d.png -i /tmp/jl_b1XznB/palette.bmp -lavfi paletteuse=dither=sierra2_4a -loop 0 -y /home/helge/test.gif`, ProcessSignaled(11)) [0]

The Problem seems to be an segmentation violation by the ffmpeg executable. When I use the same command in a terminal with /bin/ffmpeg instead everything seems to work fine.
This seems to be related to the following issue. I am running Arch Linux as well.
My full stacktraces is attatched: anim.log

Backends

This bug occurs on ( insert x below )

Backend	yes	no	untested
gr (default)	x
pyplot			x
plotly			x
plotlyjs			x
pgfplotsx			x
inspectdr			x

Versions

Plots.jl version: 1.16.5
Backend version (]st -m <backend(s)>): 0.57.5
Output of versioninfo():

Julia Version 1.6.1
Commit 6aaedecc44* (2021-04-23 05:59 UTC)
Platform Info:
  OS: Linux (x86_64-pc-linux-gnu)
  CPU: Intel(R) Core(TM) i5-3570 CPU @ 3.40GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-12.0.0 (ORCJIT, ivybridge)

[t-bltg]

@helgehr as a workaround you can use Overrides.toml in ~/.julia/artifacts (see https://pkgdocs.julialang.org/v1/artifacts/#Overriding-artifact-locations) to point to your system ffmpeg or a custom built one, and julia will use it.

Overrides.toml

[b22a6f82-2f65-5046-a5b2-351ab43fb4e5]
FFMPEG = "..."
# sha1(artifact)=7f40eeb66d90d3026ae5fb68761c263b57adb840

with FFMPEG a path to a directory containing bin/ffmpeg.

[mo8it]

@helgehr as a workaround you can use Overrides.toml in ~/.julia/artifacts (see https://pkgdocs.julialang.org/v1/artifacts/#Overriding-artifact-locations) to point to your system ffmpeg or a custom built one, and julia will use it.

Overrides.toml

[b22a6f82-2f65-5046-a5b2-351ab43fb4e5]
FFMPEG = "..."
# sha1(artifact)=7f40eeb66d90d3026ae5fb68761c263b57adb840

with FFMPEG a path to a directory containing bin/ffmpeg.

Did not work for me :(

[t-bltg]

Did not work for me :(

Still a SIGSEGV (11) ?

Try:

1. Running julia under $ strace -o log <...> and find the ffmpeg path in the log
2. $ catchsegv <...> or $ LD_PRELOAD=/usr/lib/x86_64-linux-gnu/libSegFault.so <...>

And post the results here.

Install ffmpeg with ] add FFMPEG
Run julia -e 'using FFPEG; @ffmpeg_env run(`ffmpeg -version`)'
or
julia -e 'using FFPEG; FFMPEG.exe("-version")'

My output:

ffmpeg version 4.3.1 Copyright (c) 2000-2020 the FFmpeg developers
built with gcc 8.1.0 (GCC)
configuration: --enable-cross-compile --cross-prefix=/opt/x86_64-linux-gnu/bin/x86_64-linux-gnu- --arch=x86_64 --target-os=linux --cc=cc --cxx=c++ --dep-cc=cc --ar=ar --nm=nm --objcc=objc --sysinclude=/workspace/destdir/include --pkg-config=/usr/bin/pkg-config --pkg-config-flags=--static --prefix=/workspace/destdir --sysroot=/opt/x86_64-linux-gnu/x86_64-linux-gnu/sys-root --extra-libs=-lpthread --enable-gpl --enable-version3 --enable-nonfree --disable-static --enable-shared --enable-pic --disable-debug --disable-doc --enable-avresample --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libx264 --enable-libx265 --enable-libvpx --enable-encoders --enable-decoders --enable-muxers --enable-demuxers --enable-parsers --enable-openssl --disable-schannel --extra-cflags=-I/workspace/destdir/include --extra-ldflags=-L/workspace/destdir/lib --enable-nvenc --enable-cuda-llvm
libavutil      56. 51.100 / 56. 51.100
libavcodec     58. 91.100 / 58. 91.100
libavformat    58. 45.100 / 58. 45.100
libavdevice    58. 10.100 / 58. 10.100
libavfilter     7. 85.100 /  7. 85.100
libavresample   4.  0.  0 /  4.  0.  0
libswscale      5.  7.100 /  5.  7.100
libswresample   3.  7.100 /  3.  7.100
libpostproc    55.  7.100 / 55.  7.100
Process(`[...]/.julia/artifacts/7f40eeb66d90d3026ae5fb68761c263b57adb840/bin/ffmpeg -version`, ProcessExited(0))

[helgehr]

Thanks for your advise!

For me it sadly does not work either. So I added this in my .julia/artifacts/Overrides.toml:

[b22a6f82-2f65-5046-a5b2-351ab43fb4e5]
FFMPEG = "/usr/bin/ffmpeg"

Now if I go to the julia REPL and type in using FFMPEG I get an InitError:

ERROR: InitError: Artifact "FFMPEG" was not installed correctly. Try `using Pkg; Pkg.instantiate()` to re-install all missing resources.

When I type in the suggested commands and afterwards try using FFMPEG; FFMPEG.exe("-version") I get the following error:

ERROR: MethodError: no method matching withenv_executable_wrapper(::FFMPEG.var"#4#6"{Cmd}, ::Nothing, ::String, ::String, ::Bool, ::Bool)
Closest candidates are:
  withenv_executable_wrapper(::Function, ::String, ::String, ::String, ::Bool, ::Bool) at /home/helge/.julia/packages/JLLWrappers/bkwIo/src/runtime.jl:37
Stacktrace:
 [1] #invokelatest#2
   @ ./essentials.jl:708 [inlined]
 [2] invokelatest
   @ ./essentials.jl:706 [inlined]
 [3] #ffmpeg#7
   @ ~/.julia/packages/JLLWrappers/bkwIo/src/products/executable_generators.jl:7 [inlined]
 [4] ffmpeg
   @ ~/.julia/packages/JLLWrappers/bkwIo/src/products/executable_generators.jl:7 [inlined]
 [5] #exe#2
   @ ~/.julia/packages/FFMPEG/OUpap/src/FFMPEG.jl:111 [inlined]
 [6] #exe#1
   @ ~/.julia/packages/FFMPEG/OUpap/src/FFMPEG.jl:64 [inlined]
 [7] exe(args::String)
   @ FFMPEG ~/.julia/packages/FFMPEG/OUpap/src/FFMPEG.jl:64
 [8] top-level scope
   @ REPL[3]:1

Did I do something wrong in editing the Overrides.toml?

[t-bltg]

For me it sadly does not work either. So I added this in my .julia/artifacts/Overrides.toml:

[b22a6f82-2f65-5046-a5b2-351ab43fb4e5]
FFMPEG = "/usr/bin/ffmpeg"

Did I do something wrong in editing the Overrides.toml?

Yes, it should be:

[b22a6f82-2f65-5046-a5b2-351ab43fb4e5]
FFMPEG = "/usr"

, so that "$(FFMPEG)/bin/ffmpeg" yields /usr/bin/ffmpeg.

When I type in the suggested commands and afterwards try using FFMPEG; FFMPEG.exe("-version") I get the following error:

It think it errors out because it fails to find FFMPEG in 1.

::FFMPEG.var"#4#6"{Cmd}, ::Nothing
                         ^^^^^^^^^^ nothing instead of "/usr/bin/ffmpeg"

[helgehr]

Ok, thank you! I also had to install the libavresample library, because it was not in my /usr/lib/ path, but apparently julia needs it.

But now it works!

[t-bltg]

Glad to hear ! Don't forget to close the issue if all is resolved 😉 .

[mo8it]

@t-bltg Thanks for your help! It did work :)
But I would not close the issue because this is only a workaround. The issue is not solved!

[t-bltg]

@mo8it, great !

It is a workaround, yes, but there is nothing Plots.jl can do here.

If julia -e 'using FFPEG; FFMPEG.exe("-version")' segfaults on Arch, then the issue should go in https://github.com/JuliaIO/FFMPEG.jl, not here.