[FFmpeg-trac] #5874(undetermined:new): tiff LZW compression does not compress enough

[FFmpeg]

#5874: tiff LZW compression does not compress enough
-------------------------------------+-------------------------------------
             Reporter:  jsteinkamp   |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
              Version:  unspecified  |  undetermined
             Keywords:  tiff         |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
-------------------------------------+-------------------------------------

Comment (by jsteinkamp):

 Hi I updated to most current version.
 I included the original (smaller) 32 bit file to be changed to 24 bit LZW.
 I also included the photoshop saved smaller file.

 recap:
 I convert a 32 bit file 50MB to 24 bit, it becomes 60.7MB. I resave it in
 photoshop with LZW compression it reduces to 40.8M

 please download example files from:  http://jsteinkamp.com/ffmpeg_tif.zip
 Thanks
 Jennifer

 ffmpeg version N-81872-gbe1d324 Copyright (c) 2000-2016 the FFmpeg
 developers
   built with gcc 5.4.0 (GCC)
   configuration: --enable-gpl --enable-version3 --disable-w32threads
 --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-
 bzlib --enable-libebur128 --enable-fontconfig --enable-frei0r --enable-
 gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b
 --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm
 --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-
 libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264
 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-
 libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex
 --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-
 amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-
 libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-
 libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-zlib
   libavutil      55. 32.100 / 55. 32.100
   libavcodec     57. 60.101 / 57. 60.101
   libavformat    57. 51.102 / 57. 51.102
   libavdevice    57.  0.102 / 57.  0.102
   libavfilter     6. 63.100 /  6. 63.100
   libswscale      4.  1.100 /  4.  1.100
   libswresample   2.  2.100 /  2.  2.100
   libpostproc    54.  0.100 / 54.  0.100
 [tiff_pipe @ 00000000004fa7c0] Stream #0: not enough frames to estimate
 rate; consider increasing probesize
 Input #0, tiff_pipe, from 'b.tif':
   Duration: N/A, bitrate: N/A
     Stream #0:0: Video: tiff, rgba, 2160x11520 [SAR 1:1 DAR 3:16], 25 tbr,
 25 tbn, 25 tbc
 Output #0, image2, to 'test_24.tif':
   Metadata:
     encoder         : Lavf57.51.102
     Stream #0:0: Video: tiff, rgb24, 2160x11520 [SAR 1:1 DAR 3:16],
 q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc
     Metadata:
       encoder         : Lavc57.60.101 tiff
 Stream mapping:
   Stream #0:0 -> #0:0 (tiff (native) -> tiff (native))
 Press [q] to stop, [?] for help
 frame=    1 fps=0.0 q=0.0 size=N/A time=00:00:00.00 bitrate=N/A speed=
 0x
 frame=    1 fps=0.6 q=-0.0 Lsize=N/A time=00:00:00.04 bitrate=N/A
 speed=0.026x
 video:60706kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: unknown

--
Ticket URL: <https://trac.ffmpeg.org/ticket/5874#comment:2>
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