[FFmpeg-trac] #1261(swscale:reopened): yellowish color with resize and -pix_fmt pal8
FFmpeg
trac at avcodec.org
Tue Apr 2 00:07:06 EEST 2019
#1261: yellowish color with resize and -pix_fmt pal8
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Reporter: ami_stuff | Owner:
Type: defect | Status: reopened
Priority: normal | Component: swscale
Version: git-master | Resolution:
Keywords: pal8 | Blocked By:
Blocking: | Reproduced by developer: 1
Analyzed by developer: 0 |
------------------------------------+------------------------------------
Changes (by gdgsdg123):
* status: closed => reopened
* resolution: fixed =>
Comment:
Build from:
https://ffmpeg.zeranoe.com/builds/win64/static/ffmpeg-20190331-27c94c5-win64-static.zip
{{{
ffmpeg -report -i "C:\Image-before-scaling.png" -pix_fmt pal8 -sws_flags
bicubic+accurate_rnd+full_chroma_int -vf scale=iw*2:ih*2 bicubic_text.png
}}}
gives bitexact result... (bitexact as previous)
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Previous command:
{{{
ffmpeg -report -i "C:\Image-before-scaling.png" -pix_fmt pal8 -sws_flags
bicubic+accurate_rnd -vf scale=iw*2:ih*2 bicubic_text.png
}}}
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Log:
{{{
ffmpeg started on 2019-04-02 at 04:40:24
Report written to "ffmpeg-20190402-044024.log"
Command line:
ffmpeg -report -i "C:\\Image-before-scaling.png" -pix_fmt pal8 -sws_flags
bicubic+accurate_rnd+full_chroma_int -vf "scale=iw*2:ih*2"
bicubic_text.png
ffmpeg version N-93506-g27c94c57dc Copyright (c) 2000-2019 the FFmpeg
developers
built with gcc 8.2.1 (GCC) 20190212
configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-
fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-
libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame
--enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg
--enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr
--enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack
--enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2
--enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-
libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa
--enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx
--enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-
nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
libavutil 56. 26.100 / 56. 26.100
libavcodec 58. 48.100 / 58. 48.100
libavformat 58. 26.101 / 58. 26.101
libavdevice 58. 7.100 / 58. 7.100
libavfilter 7. 48.100 / 7. 48.100
libswscale 5. 4.100 / 5. 4.100
libswresample 3. 4.100 / 3. 4.100
libpostproc 55. 4.100 / 55. 4.100
Splitting the commandline.
Reading option '-report' ... matched as option 'report' (generate a
report) with argument '1'.
Reading option '-i' ... matched as input url with argument 'C:\Image-
before-scaling.png'.
Reading option '-pix_fmt' ... matched as option 'pix_fmt' (set pixel
format) with argument 'pal8'.
Reading option '-sws_flags' ... matched as AVOption 'sws_flags' with
argument 'bicubic+accurate_rnd+full_chroma_int'.
Reading option '-vf' ... matched as option 'vf' (set video filters) with
argument 'scale=iw*2:ih*2'.
Reading option 'bicubic_text.png' ... matched as output url.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option report (generate a report) with argument 1.
Successfully parsed a group of options.
Parsing a group of options: input url C:\Image-before-scaling.png.
Successfully parsed a group of options.
Opening an input file: C:\Image-before-scaling.png.
[NULL @ 0000000000501a00] Opening 'C:\Image-before-scaling.png' for
reading
[file @ 00000000005033c0] Setting default whitelist 'file,crypto'
[png_pipe @ 0000000000501a00] Format png_pipe probed with size=2048 and
score=99
[png_pipe @ 0000000000501a00] Before avformat_find_stream_info() pos: 0
bytes read:716 seeks:0 nb_streams:1
[png_pipe @ 0000000000501a00] After avformat_find_stream_info() pos: 716
bytes read:716 seeks:0 frames:1
Input #0, png_pipe, from 'C:\Image-before-scaling.png':
Duration: N/A, bitrate: N/A
Stream #0:0, 1, 1/25: Video: png, pal8(pc), 109x40, 25 tbr, 25 tbn, 25
tbc
Successfully opened the file.
Parsing a group of options: output url bicubic_text.png.
Applying option pix_fmt (set pixel format) with argument pal8.
Applying option vf (set video filters) with argument scale=iw*2:ih*2.
Successfully parsed a group of options.
Opening an output file: bicubic_text.png.
Successfully opened the file.
detected 16 logical cores
Stream mapping:
Stream #0:0 -> #0:0 (png (native) -> png (native))
Press [q] to stop, [?] for help
cur_dts is invalid (this is harmless if it occurs once at the start per
stream)
cur_dts is invalid (this is harmless if it occurs once at the start per
stream)
[Parsed_scale_0 @ 0000000002a4dcc0] Setting 'w' to value 'iw*2'
[Parsed_scale_0 @ 0000000002a4dcc0] Setting 'h' to value 'ih*2'
[Parsed_scale_0 @ 0000000002a4dcc0] Setting 'flags' to value 'bicubic'
[Parsed_scale_0 @ 0000000002a4dcc0] Setting 'sws_flags' to value
'bicubic+accurate_rnd+full_chroma_int'
[Parsed_scale_0 @ 0000000002a4dcc0] w:iw*2 h:ih*2 flags:'bicubic' interl:0
[graph 0 input from stream 0:0 @ 0000000002a4efc0] Setting 'video_size' to
value '109x40'
[graph 0 input from stream 0:0 @ 0000000002a4efc0] Setting 'pix_fmt' to
value '11'
[graph 0 input from stream 0:0 @ 0000000002a4efc0] Setting 'time_base' to
value '1/25'
[graph 0 input from stream 0:0 @ 0000000002a4efc0] Setting 'pixel_aspect'
to value '0/1'
[graph 0 input from stream 0:0 @ 0000000002a4efc0] Setting 'sws_param' to
value 'flags=2'
[graph 0 input from stream 0:0 @ 0000000002a4efc0] Setting 'frame_rate' to
value '25/1'
[graph 0 input from stream 0:0 @ 0000000002a4efc0] w:109 h:40 pixfmt:pal8
tb:1/25 fr:25/1 sar:0/1 sws_param:flags=2
[format @ 0000000002a59440] Setting 'pix_fmts' to value 'pal8'
[AVFilterGraph @ 0000000002a4d600] query_formats: 4 queried, 3 merged, 0
already done, 0 delayed
[Parsed_scale_0 @ 0000000002a4dcc0] w:109 h:40 fmt:pal8 sar:0/1 -> w:218
h:80 fmt:pal8 sar:0/1 flags:0x4
Output #0, image2, to 'bicubic_text.png':
Metadata:
encoder : Lavf58.26.101
Stream #0:0, 0, 1/25: Video: png, pal8, 218x80, q=2-31, 200 kb/s, 25
fps, 25 tbn, 25 tbc
Metadata:
encoder : Lavc58.48.100 png
Clipping frame in rate conversion by 0.000008
cur_dts is invalid (this is harmless if it occurs once at the start per
stream)
cur_dts is invalid (this is harmless if it occurs once at the start per
stream)
[out_0_0 @ 0000000002a59280] EOF on sink link out_0_0:default.
No more output streams to write to, finishing.
[image2 @ 0000000000503500] Opening 'bicubic_text.png' for writing
[file @ 0000000002a80bc0] Setting default whitelist 'file,crypto'
[AVIOContext @ 000000000a329900] Statistics: 0 seeks, 1 writeouts
frame= 1 fps=0.0 q=-0.0 Lsize=N/A time=00:00:00.04 bitrate=N/A
speed=4.44x
video:3kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: unknown
Input file #0 (C:\Image-before-scaling.png):
Input stream #0:0 (video): 1 packets read (716 bytes); 1 frames decoded;
Total: 1 packets (716 bytes) demuxed
Output file #0 (bicubic_text.png):
Output stream #0:0 (video): 1 frames encoded; 1 packets muxed (3380
bytes);
Total: 1 packets (3380 bytes) muxed
1 frames successfully decoded, 0 decoding errors
[AVIOContext @ 000000000050b640] Statistics: 716 bytes read, 0 seeks
}}}
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Highlight:
{{{
[swscaler @ 000000000297a840] Forcing full internal H chroma due to input
having non subsampled chroma
}}}
is missing. (comparing to previous log)
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Which implied `full_chroma_int` are set in both operations.
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Off-topic:
What's the difference between `full_chroma_int` and `full_chroma_inp`?..
And their relationship? (dependencies, etc...)
--
Ticket URL: <https://trac.ffmpeg.org/ticket/1261#comment:7>
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