[FFmpeg-trac] #10712(ffmpeg:new): scale + overlay OOM after stream EOF

[FFmpeg]

#10712: scale + overlay OOM after stream EOF
-------------------------------------+-------------------------------------
             Reporter:  Leon         |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:  ffmpeg       |                  Version:  git-
             Keywords:  scale        |  master
  overlay oom                        |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:
 As in #10698, but now using the `scale` filter and `overlay` with
 `shortest=1`, ffmpeg starts using a lot of memory once the stream passed
 via `scale` to `overlay` goes EOF.

 How to reproduce:
 Create a test mkv that will be used as an input for the transcode (lower
 values for -t suffice, since the subtitles are EOF immediately, but too
 low values may result in the transcode finishing before a significant
 increase in memory usage can be observed):
 {{{
 % ffmpeg -f lavfi -i color -f lavfi -i anullsrc=sample_rate=1 -t 5000 -c:v
 libx264 test.mkv
 }}}
 Download the subtitles attached to #10698 and extract them.
 Run the transcode:
 {{{
 ffmpeg -i test.mkv -i test.idx -map 0:0 -map 0:1 -map -0:0 -filter_complex
 '[1:0]scale[sub];[0:0][sub]overlay=shortest=1' out.mkv
 }}}

 Additional information:
 {{{
 % ffmpeg -version
 ffmpeg version N-112745-gda3ce21f68 Copyright (c) 2000-2023 the FFmpeg
 developers
 built with gcc 13.2.1 (GCC) 20230801
 configuration: --prefix=/usr --disable-static --disable-stripping
 --disable-htmlpages --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-libbs2b --enable-libdav1d --enable-libdrm --enable-libfreetype
 --enable-libfribidi --enable-libgsm --enable-libiec61883 --enable-libjack
 --enable-libjxl --enable-libmodplug --enable-libmp3lame --enable-
 libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg
 --enable-libopenmpt --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-libvpl
 --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265
 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-libzimg
 --enable-opengl --enable-shared --enable-version3 --enable-vulkan
 libavutil      58. 32.100 / 58. 32.100
 libavcodec     60. 33.100 / 60. 33.100
 libavformat    60. 17.100 / 60. 17.100
 libavdevice    60.  4.100 / 60.  4.100
 libavfilter     9. 13.100 /  9. 13.100
 libswscale      7.  6.100 /  7.  6.100
 libswresample   4. 13.100 /  4. 13.100
 libpostproc    57.  4.100 / 57.  4.100
 }}}
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/10712>
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