[FFmpeg-trac] #8955(ffplay:new): ffplay, zmq example doesn't work

[FFmpeg]

#8955: ffplay, zmq example doesn't work
-------------------------------------+-------------------------------------
             Reporter:  mkoch        |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:  ffplay       |                  Version:  git-
                                     |  master
             Keywords:  zmq example  |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 This command line is given as an example in the official documentation of
 the zmq filter. https://www.ffmpeg.org/ffmpeg-all.html#zmq_002c-azmq

 ffplay -dumpgraph 1 -f lavfi
 "color=s=100x100:c=red[l];color=s=100x100:c=blue[r];nullsrc=s=200x100,zmq[bg];[bg][l]overlay[bg+l];[bg+l][r]overlay
 at my=x=100"

 The problem is that ffplay exits after 1-5 seconds (or sometimes even
 longer) without any error message, and without showing the output window.
 I'm not sending any commands to the zmq filter.
 Known workaround: Change the size of nullsrc to 400x200, then it works.


 C:\Users\astro\Desktop>c:\ffmpeg\ffplay -dumpgraph 1 -f lavfi
 "color=s=100x100:c=red[l];color=s=100x100:c=blue[r];nullsrc=s=200x100,zmq[bg];[bg][l]overlay[bg+l];[bg+l][r]overlay
 at my=x=100"
 ffplay version 2020-10-21-git-289e964873-essentials_build-www.gyan.dev
 Copyright (c) 2003-2020 the FFmpeg developers
    built with gcc 10.2.0 (Rev3, 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. 60.100 / 56. 60.100
    libavcodec     58.111.101 / 58.111.101
    libavformat    58. 62.100 / 58. 62.100
    libavdevice    58. 11.102 / 58. 11.102
    libavfilter     7. 88.100 /  7. 88.100
    libswscale      5.  8.100 /  5.  8.100
    libswresample   3.  8.100 /  3.  8.100
    libpostproc    55.  8.100 / 55.  8.100
 +----------------+0 fd=   0 aq=    0KB vq=    0KB sq=    0B f=0/0
 | Parsed_color_0 |default--[100x100 1:1
 yuva420p]--Parsed_overlay_4:overlay
 |    (color)     |
 +----------------+

 +----------------+
 | Parsed_color_1 |default--[100x100 1:1 yuva420p]--overlay at my:overlay
 |    (color)     |
 +----------------+

 +------------------+
 | Parsed_nullsrc_2 |default--[200x100 1:1 yuva420p]--Parsed_zmq_3:default
 |    (nullsrc)     |
 +------------------+

 +--------------+
 Parsed_nullsrc_2:default--[200x100 1:1 yuva420p]--default| Parsed_zmq_3
 |default--[200x100 1:1 yuva420p]--Parsed_overlay_4:main
                                                           | (zmq)     |
 +--------------+

 +------------------+
 Parsed_zmq_3:default----[200x100 1:1 yuva420p]-----main|
 Parsed_overlay_4 |default--[200x100 1:1 yuva420p]--overlay at my:main
 Parsed_color_0:default--[100x100 1:1 yuva420p]--overlay| (overlay)     |
 +------------------+

 +------------+
 Parsed_overlay_4:default--[200x100 1:1 yuva420p]-----main| overlay at my
 |default--[200x100 1:1 yuva420p]--out:default
 Parsed_color_1:default----[100x100 1:1 yuva420p]--overlay| (overlay)  |
 +------------+

                                                     +--------------+
 overlay at my:default--[200x100 1:1 yuva420p]--default|     out      |
                                                     | (buffersink) |
                                                     +--------------+

 Input #0, lavfi, from
 'color=s=100x100:c=red[l];color=s=100x100:c=blue[r];nullsrc=s=200x100,zmq[bg];[bg][l]overlay[bg+l];[bg+l][r]overlay
 at my=x=100':
    Duration: N/A, start: 0.000000, bitrate: N/A
      Stream #0:0: Video: rawvideo (Y4[11][8] / 0x80B3459), yuva420p,
 200x100 [SAR 1:1 DAR 2:1], 25 tbr, 25 tbn, 25 tbc

--
Ticket URL: <https://trac.ffmpeg.org/ticket/8955>
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