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b3a0548a98
Scaler relys on "-sws_flags" option to pass the flags to swscale
and scale filter. Currently passing "sws_flags=xxx" as a filter
option to scaler leads to an incorrect option parsing.
Check and change the string to "flags=xxx" and dumped flags information.
(Refer to parse_sws_flags())
CMD:
$ffmpeg -v verbose -i input.mp4 -sws_flags lanczos+bitexact+accurate_rnd \
-vf format=yuv420p,scale=800x600 -an -vframes 10 -f md5 -
Before:
[auto_scaler_0 @ 0x7f96c3808680] w:iw h:ih flags:'' interl:0
[auto_scaler_0 @ 0x7f96c3808680] w:1920 h:1080 fmt:yuvj420p sar:0/1 -> w:1920 h:1080 fmt:yuv420p sar:0/1 flags:0x0
[Parsed_scale_1 @ 0x7f96c3806e40] w:1920 h:1080 fmt:yuv420p sar:0/1 -> w:800 h:600 fmt:yuv420p sar:0/1 flags:0x0
MD5=ff1d6091690c6fcd36d458d2a9f648ce
After:
[auto_scaler_0 @ 0x7fe94563b4c0] w:iw h:ih flags:'lanczos+bitexact+accurate_rnd' interl:0
[auto_scaler_0 @ 0x7fe94563b4c0] w:1920 h:1080 fmt:yuvj420p sar:0/1 -> w:1920 h:1080 fmt:yuv420p sar:0/1 flags:0xc0200
[Parsed_scale_1 @ 0x7fe945639d00] w:1920 h:1080 fmt:yuv420p sar:0/1 -> w:800 h:600 fmt:yuv420p sar:0/1 flags:0xc0200
MD5=ff1d6091690c6fcd36d458d2a9f648ce
Signed-off-by: Linjie Fu <linjie.justin.fu@gmail.com>
FFmpeg README
FFmpeg is a collection of libraries and tools to process multimedia content such as audio, video, subtitles and related metadata.
Libraries
libavcodecprovides implementation of a wider range of codecs.libavformatimplements streaming protocols, container formats and basic I/O access.libavutilincludes hashers, decompressors and miscellaneous utility functions.libavfilterprovides a mean to alter decoded Audio and Video through chain of filters.libavdeviceprovides an abstraction to access capture and playback devices.libswresampleimplements audio mixing and resampling routines.libswscaleimplements color conversion and scaling routines.
Tools
- ffmpeg is a command line toolbox to manipulate, convert and stream multimedia content.
- ffplay is a minimalistic multimedia player.
- ffprobe is a simple analysis tool to inspect multimedia content.
- Additional small tools such as
aviocat,ismindexandqt-faststart.
Documentation
The offline documentation is available in the doc/ directory.
The online documentation is available in the main website and in the wiki.
Examples
Coding examples are available in the doc/examples directory.
License
FFmpeg codebase is mainly LGPL-licensed with optional components licensed under GPL. Please refer to the LICENSE file for detailed information.
Contributing
Patches should be submitted to the ffmpeg-devel mailing list using
git format-patch or git send-email. Github pull requests should be
avoided because they are not part of our review process and will be ignored.