libavfilter/showwavespic crash on windows

[mvignali]

Summary of the bug:
Generating waveform image with showwavespic from wav or sine generator crash ffmpeg.
Can't reproduce on osx.

Can't reproduce with older build :
ffmpeg-20161107-34aeb5d-win64-static

How to reproduce:

"C:\ff_debug\ffmpeg-20171013-ad56e80-win64-static\bin\ffmpeg.exe" -f lavfi -i "sine=frequency=1000:duration=5" -filter_complex showwavespic=s=1000x200:split_channels=1 -frames:v 1 -n "C:\ff_debug\Res.png" -loglevel debug

Console output

"C:\ff_debug\ffmpeg-20171013-ad56e80-win64-static\bin\ffmpeg.
exe" -f lavfi -i "sine=frequency=1000:duration=5" -filter_complex showwavespic=s
=1000x200:split_channels=1 -frames:v 1 -n "C:\ff_debug\Res.png" -loglevel debug
ffmpeg version N-87862-gad56e8057d Copyright (c) 2000-2017 the FFmpeg developers

  built with gcc 7.2.0 (GCC)
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --e
nable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libblur
ay --enable-libfreetype --enable-libmp3lame --enable-libopenjpeg --enable-libopu
s --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --ena
ble-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-lib
x264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-z
lib --enable-gmp --enable-libvidstab --enable-cuda --enable-cuvid --enable-d3d11
va --enable-nvenc --enable-dxva2 --enable-avisynth --enable-libmfx
  libavutil      55. 79.100 / 55. 79.100
  libavcodec     57.108.100 / 57.108.100
  libavformat    57. 84.100 / 57. 84.100
  libavdevice    57. 11.100 / 57. 11.100
  libavfilter     6.108.100 /  6.108.100
  libswscale      4.  9.100 /  4.  9.100
  libswresample   2. 10.100 /  2. 10.100
  libpostproc    54.  8.100 / 54.  8.100
Splitting the commandline.
Reading option '-f' ... matched as option 'f' (force format) with argument 'lavf
i'.
Reading option '-i' ... matched as input url with argument 'sine=frequency=1000:
duration=5'.
Reading option '-filter_complex' ... matched as option 'filter_complex' (create
a complex filtergraph) with argument 'showwavespic=s=1000x200:split_channels=1'.

Reading option '-frames:v' ... matched as option 'frames' (set the number of fra
mes to output) with argument '1'.
Reading option '-n' ... matched as option 'n' (never overwrite output files) wit
h argument '1'.
Reading option 'C:\ff_debug\Res.png' ... matched as output url.
Reading option '-loglevel' ... matched as option 'loglevel' (set logging level)
with argument 'debug'.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option filter_complex (create a complex filtergraph) with argument show
wavespic=s=1000x200:split_channels=1.
Applying option n (never overwrite output files) with argument 1.
Applying option loglevel (set logging level) with argument debug.
Successfully parsed a group of options.
Parsing a group of options: input url sine=frequency=1000:duration=5.
Applying option f (force format) with argument lavfi.
Successfully parsed a group of options.
Opening an input file: sine=frequency=1000:duration=5.
detected 4 logical cores
[Parsed_sine_0 @ 00000000007d9d00] Setting 'frequency' to value '1000'
[Parsed_sine_0 @ 00000000007d9d00] Setting 'duration' to value '5'
[AVFilterGraph @ 00000000003acf60] query_formats: 2 queried, 3 merged, 0 already
 done, 0 delayed
[lavfi @ 00000000003ac6e0] All info found
Input #0, lavfi, from 'sine=frequency=1000:duration=5':
  Duration: N/A, start: 0.000000, bitrate: 705 kb/s
    Stream #0:0, 1, 1/44100: Audio: pcm_s16le, 44100 Hz, mono, s16, 705 kb/s
Successfully opened the file.
[Parsed_showwavespic_0 @ 00000000007dd9c0] Setting 's' to value '1000x200'
[Parsed_showwavespic_0 @ 00000000007dd9c0] Setting 'split_channels' to value '1'

Parsing a group of options: output url C:\ff_debug\Res.png.
Applying option frames:v (set the number of frames to output) with argument 1.
Successfully parsed a group of options.
Opening an output file: C:\ff_debug\Res.png.
Successfully opened the file.
Stream mapping:
  Stream #0:0 (pcm_s16le) -> showwavespic
  showwavespic -> Stream #0:0 (png)
Press [q] to stop, [?] for help
cur_dts is invalid (this is harmless if it occurs once at the start per stream)
[Parsed_showwavespic_0 @ 00000000003c34a0] Setting 's' to value '1000x200'
[Parsed_showwavespic_0 @ 00000000003c34a0] Setting 'split_channels' to value '1'

[graph_0_in_0_0 @ 00000000003c4340] Setting 'time_base' to value '1/44100'
[graph_0_in_0_0 @ 00000000003c4340] Setting 'sample_rate' to value '44100'
[graph_0_in_0_0 @ 00000000003c4340] Setting 'sample_fmt' to value 's16'
[graph_0_in_0_0 @ 00000000003c4340] Setting 'channel_layout' to value '0x4'
[graph_0_in_0_0 @ 00000000003c4340] tb:1/44100 samplefmt:s16 samplerate:44100 ch
layout:0x4
[format @ 00000000003c4ec0] compat: called with args=[rgb24|rgba|rgb48be|rgba64b
e|pal8|gray|ya8|gray16be|ya16be|monob]
[format @ 00000000003c4ec0] Setting 'pix_fmts' to value 'rgb24|rgba|rgb48be|rgba
64be|pal8|gray|ya8|gray16be|ya16be|monob'
[AVFilterGraph @ 00000000003c31c0] query_formats: 4 queried, 5 merged, 0 already
 done, 0 delayed
[Parsed_showwavespic_0 @ 00000000003c34a0] s:1000x200 r:44.100000 n:1
Output #0, image2, to 'C:\ff_debug\Res.png':
  Metadata:
    encoder         : Lavf57.84.100
    Stream #0:0, 0, 10/441: Video: png, 1 reference frame, rgba, 1000x200 [SAR 1
:1 DAR 5:1], 0/1, q=2-31, 200 kb/s, 44.10 fps, 44.10 tbn, 44.10 tbc
    Metadata:
      encoder         : Lavc57.108.100 png
cur_dts is invalid (this is harmless if it occurs once at the start per stream)
    Last message repeated 215 times
[Parsed_sine_0 @ 00000000007d9d00] EOF timestamp not reliable
[Parsed_showwavespic_0 @ 00000000003c34a0] Create frame averaging 220 samples pe
r column
cur_dts is invalid (this is harmless if it occurs once at the start per stream)
Clipping frame in rate conversion by 0.000008
No more output streams to write to, finishing.

[Carl Eugen Hoyos]

Backtrace, disassembly and register dump missing.

[mvignali]

Replying to cehoyos:

Backtrace, disassembly and register dump missing.

Don't have compilation environment on Windows (only use zeranoe build)
And like i can't reproduce it on osx, can't send these informations.

[Carl Eugen Hoyos]

Please reopen if this wasn't just an issue with the zlib in the Zeranoe binaries.

[mvignali]

Yes you're right, the crash only happen with png, not with tga or jpeg for example
And seems to be fix, with latest zeranoe build