[FFmpeg-trac] #3998(ffmpeg:new): ffmpeg uses 300mb memory to convert one jpg to jpg

[FFmpeg]

#3998: ffmpeg uses 300mb memory to convert one jpg to jpg
---------------------------------------+--------------------------------
               Reporter:  compn        |                  Owner:
                   Type:  enhancement  |                 Status:  new
               Priority:  wish         |              Component:  ffmpeg
                Version:  git-master   |               Keywords:  memory
             Blocked By:               |               Blocking:
Reproduced by developer:  0            |  Analyzed by developer:  0
---------------------------------------+--------------------------------
 only tested on windows.

 F:\>ffmpeg -i DSC00418.JPG out.jpg
 ffmpeg version N-64539-gc8b2cf4 Copyright (c) 2000-2014 the FFmpeg
 developers
   built on Jul  8 2014 22:02:17 with gcc 4.8.3 (GCC)
   configuration: --enable-gpl --enable-version3 --disable-w32threads
 --enable-avisynth --enable-bzli
 b --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv
 --enable-libass --enable-libblu
 ray --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm
 --enable-libilbc --enable-
 libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-
 libopencore-amrwb --enable-libope
 njpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-
 libsoxr --enable-libspeex
 --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-
 aacenc --enable-libvo-amrw
 benc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-
 libwebp --enable-libx264 --enab
 le-libx265 --enable-libxavs --enable-libxvid --enable-decklink --enable-
 zlib
   libavutil      52. 91.100 / 52. 91.100
   libavcodec     55. 68.102 / 55. 68.102
   libavformat    55. 45.100 / 55. 45.100
   libavdevice    55. 13.102 / 55. 13.102
   libavfilter     4. 10.100 /  4. 10.100
   libswscale      2.  6.100 /  2.  6.100
   libswresample   0. 19.100 /  0. 19.100
   libpostproc    52.  3.100 / 52.  3.100
 Input #0, image2, from 'DSC00418.JPG':
   Duration: 00:00:00.04, start: 0.000000, bitrate: N/A
     Stream #0:0: Video: mjpeg, yuvj422p(pc, bt470bg), 4608x3456, 25 tbr,
 25 tbn, 25 tbc
 [image2 @ 02da9020] Using AVStream.codec.time_base as a timebase hint to
 the muxer is deprecated. Se
 t AVStream.time_base instead.
 Output #0, image2, to 'out.jpg':
   Metadata:
     encoder         : Lavf55.45.100
     Stream #0:0: Video: mjpeg, yuvj422p, 4608x3456, q=2-31, 200 kb/s, 25
 fps, 25 tbn, 25 tbc
     Metadata:
       encoder         : Lavc55.68.102 mjpeg
 Stream mapping:
   Stream #0:0 -> #0:0 (mjpeg (native) -> mjpeg (native))
 Press [q] to stop, [?] for help
 frame=    1 fps=0.0 q=12.4 Lsize=N/A time=00:00:00.04 bitrate=N/A
 video:628kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: unknown


 if i use ffmpeg -i DSC00418.JPG -f null NUL
 memory usage is only 70mb
 (NUL is windows /dev/null)

 likewise ffmpeg -i DSC00418.JPG -vcodec copy out.jpg -y
 only uses 60MB memory.

 ffmpeg from nov 2013, ffmpeg version N-58288-g80e5859 , also has the same
 memory usage.
 so i do not think it is a regression.

 ffmpeg -i DSC00418.JPG -s 640x480 out.jpg -y
 also only uses 60mb memory. so maybe the problem is in jpeg encoder on
 large resolution?

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Ticket URL: <https://trac.ffmpeg.org/ticket/3998>
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