Re: [FFmpeg-trac] #5874(avcodec:open): tiff LZW compression does not compress enough

[FFmpeg]

#5874: tiff LZW compression does not compress enough
-+---
 Reporter:  jsteinkamp   |Owner:
 Type:  enhancement  |   Status:  open
 Priority:  wish |Component:  avcodec
  Version:  git-master   |   Resolution:
 Keywords:  tif  |   Blocked By:
 Blocking:   |  Reproduced by developer:  1
Analyzed by developer:  0|
-+---

Comment (by Balling):

 libavcodec is better now 784234 Bytes... But !!! It does not store the
 alpha channel and if you will save tiff in photoshop 21.1 without alpha
 channel it will be... wait for it... 605392 Bytes! Just wow. With alpha
 channel it will be the same (algorithm in Photoshop is the same, bite
 stream is the same, though some metadata is different). Maybe will try to
 check libtiff.

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Re: [FFmpeg-trac] #5874(avcodec:open): tiff LZW compression does not compress enough

[FFmpeg]

#5874: tiff LZW compression does not compress enough
-+---
 Reporter:  jsteinkamp   |Owner:
 Type:  enhancement  |   Status:  open
 Priority:  wish |Component:  avcodec
  Version:  git-master   |   Resolution:
 Keywords:  tif  |   Blocked By:
 Blocking:   |  Reproduced by developer:  1
Analyzed by developer:  0|
-+---

Comment (by Balling):

 Replying to [comment:8 jamrial]:
 > tiffcp from the libtiff package compresses it even more, from ~716k to
 ~691k. In contrast the output generated by libavcodec is ~884k.
 >
 > Our lzw encoder is apparently inefficient, so changing this to an
 enhancement request.

 I think it is a good idea to update this with Photoshop 2020 and latest
 tiffcp...

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Re: [FFmpeg-trac] #5874(avcodec:open): tiff LZW compression does not compress enough

[FFmpeg]

#5874: tiff LZW compression does not compress enough
-+---
 Reporter:  jsteinkamp   |Owner:
 Type:  enhancement  |   Status:  open
 Priority:  wish |Component:  avcodec
  Version:  git-master   |   Resolution:
 Keywords:  tif  |   Blocked By:
 Blocking:   |  Reproduced by developer:  1
Analyzed by developer:  0|
-+---
Changes (by jamrial):

 * priority:  normal => wish
 * type:  defect => enhancement


Comment:

 tiffcp from the libtiff package compresses it even more, from ~716k to
 ~691k. In contrast the output generated by libavcodec is ~884k.

 Our lzw encoder is apparently inefficient, so changing this to an
 enhancement request.

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Re: [FFmpeg-trac] #5874(avcodec:open): tiff LZW compression does not compress enough

[FFmpeg]

#5874: tiff LZW compression does not compress enough
+---
 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   |
+---

Comment (by jsteinkamp):

 Hi I made you a photoshop LZW compressed image at:
 http://jsteinkamp.com/saved_photoshop.zip

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Re: [FFmpeg-trac] #5874(avcodec:open): tiff LZW compression does not compress enough

[FFmpeg]

#5874: tiff LZW compression does not compress enough
+---
 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   |
+---

Comment (by cehoyos):

 Replying to [comment:5 jsteinkamp]:

 > The LZW compression for TIFF is still larger than photoshop.
 > photoshop file 716 KB

 Where can I find this sample?

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Re: [FFmpeg-trac] #5874(avcodec:open): tiff LZW compression does not compress enough

[FFmpeg]

#5874: tiff LZW compression does not compress enough
+---
 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   |
+---

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
   libavformat58. 13.102 / 58. 13.102
   libavdevice58.  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
   libpostproc55.  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.

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Re: [FFmpeg-trac] #5874(avcodec:open): tiff LZW compression does not compress enough

[FFmpeg]

#5874: tiff LZW compression does not compress enough
+---
 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   |
+---
Changes (by cehoyos):

 * keywords:  tiff => tif


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Re: [FFmpeg-trac] #5874(avcodec:open): tiff LZW compression does not compress enough

[FFmpeg]

#5874: tiff LZW compression does not compress enough
+---
 Reporter:  jsteinkamp  |Owner:
 Type:  defect  |   Status:  open
 Priority:  normal  |Component:  avcodec
  Version:  git-master  |   Resolution:
 Keywords:  tiff|   Blocked By:
 Blocking:  |  Reproduced by developer:  1
Analyzed by developer:  0   |
+---
Changes (by cehoyos):

 * status:  new => open
 * version:  unspecified => git-master
 * component:  undetermined => avcodec
 * reproduced:  0 => 1


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