[FFmpeg-trac] #5874(avcodec:open): tiff LZW compression does not compress enough
FFmpeg
trac at avcodec.org
Sun May 13 20:22:54 EEST 2018
#5874: tiff LZW compression does not compress enough
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Reporter: jsteinkamp | Owner:
Type: defect | Status: open
Priority: normal | Component: avcodec
Version: git-master | Resolution:
Keywords: tif | Blocked By:
Blocking: | Reproduced by developer: 1
Analyzed by developer: 0 |
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Comment (by jsteinkamp):
jsteinkamp Replying to [ticket:5874 jsteinkamp]:
HI, I tested this bug again.
The LZW compression for TIFF is still larger than photoshop.
photoshop file 716 KB, ffmpeg file 884KB
The file was 32 bit 1024x768 included an alpha channel
ffmpeg version: N-91024-g293a6e8332
built with gcc 7.3.0 (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-libopencore-amrnb
--enable-
libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine
--enab
le-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame
--enable-li
bvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-
libx265 --en
able-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp
--enable-
libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa
--enabl
e-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf
--enabl
e-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec
--enab
le-dxva2 --enable-avisynth
libavutil 56. 18.100 / 56. 18.100
libavcodec 58. 19.101 / 58. 19.101
libavformat 58. 13.102 / 58. 13.102
libavdevice 58. 4.100 / 58. 4.100
libavfilter 7. 21.100 / 7. 21.100
libswscale 5. 2.100 / 5. 2.100
libswresample 3. 2.100 / 3. 2.100
libpostproc 55. 2.100 / 55. 2.100
Input #0, tiff_pipe, from 'hibiscus1.0001.tif':
Duration: N/A, bitrate: N/A
Stream #0:0: Video: tiff, rgba, 1024x768 [SAR 1:1 DAR 4:3], 25 tbr, 25
tbn,
25 tbc
Stream mapping:
Stream #0:0 -> #0:0 (tiff (native) -> tiff (native))
Press [q] to stop, [?] for help
Output #0, image2, to 'hibiscus1.0001.tif':
Metadata:
encoder : Lavf58.13.102
Stream #0:0: Video: tiff, rgba, 1024x768 [SAR 1:1 DAR 4:3], q=2-31,
200 kb/s
, 25 fps, 25 tbn, 25 tbc
Metadata:
encoder : Lavc58.19.101 tiff
frame= 1 fps=0.0 q=-0.0 Lsize=N/A time=00:00:00.04 bitrate=N/A
speed=0.526x
video:883kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
muxing o
verhead: unknown
> Summary of the bug:tiff LZW compression might not compress enough
> How to reproduce:
> ffmpeg -y -i b.tif -pix_fmt rgb24 -vcodec tiff -compression_algo lzw
test_24.tif
> The file made in ffmepg is 59.2 MB, if I resave the file in photoshop it
is 39.8 MB
> ffmpeg version
> N-78598-g98a0053
> Patches should be submitted to the ffmpeg-devel mailing list and not
this bug tracker.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/5874#comment:5>
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