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Linjie Fu 0b511bd9a5 fftools/ffmpeg_filter: add -autoscale to disable/enable the default scale 
Currently, ffmpeg inserts scale filter by default in the filter graph
to force the whole decoded stream to scale into the same size with the
first frame. It's not quite make sense in resolution changing cases if
user wants the rawvideo without any scale.

Using autoscale/noautoscale as an output option to indicate whether auto
inserting the scale filter in the filter graph:
    -noautoscale or -autoscale 0:
    disable the default auto scale filter inserting.

ffmpeg -y -i input.mp4 out1.yuv -noautoscale out2.yuv -autoscale 0 out3.yuv

Update docs.

Suggested-by:  Mark Thompson <sw@jkqxz.net>
Reviewed-by:   Nicolas George <george@nsup.org>
Signed-off-by: U. Artie Eoff <ullysses.a.eoff@intel.com>
Signed-off-by: Linjie Fu <linjie.fu@intel.com>
2020-06-18 16:31:09 +08:00
compat compat/cuda/ptx2c: remove shell loop; fix BSD sed compat 2020-06-01 22:10:41 -05:00
doc fftools/ffmpeg_filter: add -autoscale to disable/enable the default scale 2020-06-18 16:31:09 +08:00
ffbuild common.mak: Also clean Windows debug files. 2020-03-21 18:46:00 +01:00
fftools fftools/ffmpeg_filter: add -autoscale to disable/enable the default scale 2020-06-18 16:31:09 +08:00
libavcodec avcodec/ccaption_dec: do not modify pkt data and stop removing parity bit twice 2020-06-17 00:38:08 +02:00
libavdevice lavdevice: Add AudioToolbox output device. 2020-06-15 15:09:33 +02:00
libavfilter dnn_backend_native: check operand index 2020-06-17 13:42:52 +08:00
libavformat avformat/apm: check codec tag in probe and add constant 2020-06-17 21:45:10 +02:00
libavresample
libavutil lavu/internal: Fix comment for avpriv_dict_set_timestamp 2020-06-14 12:27:10 +08:00
libpostproc Bump minor versions after branching 4.3 2020-06-08 22:49:04 +02:00
libswresample Bump minor versions after branching 4.3 2020-06-08 22:49:04 +02:00
libswscale swscale: cosmetic fixes 2020-06-14 16:34:07 +01:00
presets
tests avformat/movenc: Write 'av01' as a compatible brand when muxing AV1 2020-06-17 19:06:45 +01:00
tools tools/target_dec_fuzzer: Adjust threshold for lagarith 2020-06-11 14:59:04 +02:00
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.travis.yml
Changelog lavdevice: Add AudioToolbox output device. 2020-06-15 15:09:33 +02:00
configure lavdevice: Add AudioToolbox output device. 2020-06-15 15:09:33 +02:00
CONTRIBUTING.md
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INSTALL.md
LICENSE.md avfilter/vf_geq: Relicense to LGPL 2019-12-28 11:20:48 +01:00
MAINTAINERS oggdec: remove the oggparsedaala subdemuxer 2020-05-23 19:07:20 +01:00
Makefile Makefile: Delete more created files when running "make distclean". 2020-03-11 11:43:01 +01:00
README.md
RELEASE RELEASE: We are after the 4.3 branch point, update for that 2020-06-10 00:20:24 +02:00

README.md

FFmpeg README

FFmpeg is a collection of libraries and tools to process multimedia content such as audio, video, subtitles and related metadata.

Libraries

  • libavcodec provides implementation of a wider range of codecs.
  • libavformat implements streaming protocols, container formats and basic I/O access.
  • libavutil includes hashers, decompressors and miscellaneous utility functions.
  • libavfilter provides a mean to alter decoded Audio and Video through chain of filters.
  • libavdevice provides an abstraction to access capture and playback devices.
  • libswresample implements audio mixing and resampling routines.
  • libswscale implements 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, ismindex and qt-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.