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Alex Xu (Hello71) 6fdd7fe0b8 avformat/img2dec: probe JFIF/Exif header 
Due to reasons, mpv doesn't pass filename when probing. mpv also sets
default probescore threshold to 26. Since the current jpeg_probe
implementation returns 25 until EOI, it means that the whole image needs
to be probed to succeed. Worse, the whole image is not passed at once;
increasingly large buffers are tried before that. Adding it up together,
if many demuxers are enabled, moderately large JPEG files (few MB) can
take several seconds to open, despite taking less than 1 second to
actually decode.

Therefore, adjust the heuristic to be more optimistic if proper JFIF or
Exif segments are found. While not strictly required, the vast majority
of JPEG-ish files have one or the other or both.

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2021-11-27 18:24:49 +01:00
compat Replace all occurences of av_mallocz_array() by av_calloc() 2021-09-20 01:03:52 +02:00
doc avformat/rtp: add localaddr for network interface selection 2021-11-27 11:21:17 +08:00
ffbuild avfilter: compress CUDA PTX code if possible 2021-06-22 14:05:44 +02:00
fftools fftools/ffmpeg: Take type limitations of AVFifo API into account 2021-11-26 18:55:58 +01:00
libavcodec avcodec/mjpeg_parser: skip markers after EOI, not by size 2021-11-27 18:24:49 +01:00
libavdevice av(codec|device): Don't cast pointers to int 2021-11-21 00:35:30 +01:00
libavfilter avfilter/af_biquads: add svf transform type 2021-11-26 00:55:32 +01:00
libavformat avformat/img2dec: probe JFIF/Exif header 2021-11-27 18:24:49 +01:00
libavutil hwcontext_vulkan: use correct return value for allocation failure 2021-11-27 04:46:41 +01:00
libpostproc libpostproc/postprocess_template: Don't reimplement FFSWAP 2021-10-02 17:13:42 +02:00
libswresample swresample/aarch64: fix relocation out of range error 2021-09-25 21:55:29 +03:00
libswscale swscale/input: clip rgbf32 values before lrintf 2021-11-15 16:50:10 -03:00
presets
tests ffmpeg: fix loosing gaps between audio frame timestamps when filtering 2021-11-18 12:54:17 +01:00
tools tools/target_dec_fuzzer: Adjust threshold for MXPEG 2021-10-21 14:17:12 +02:00
.gitattributes fate: add SCC test 2017-01-27 17:06:42 +01:00
.gitignore avfilter: compress CUDA PTX code if possible 2021-06-22 14:05:44 +02:00
.mailmap mailmap: add entry for myself 2021-03-09 02:09:55 +00:00
.travis.yml Merge commit '899ee03088' 2019-03-14 15:53:16 -03:00
Changelog avcodec: suppport for bitpacked encode 2021-11-25 15:04:35 +08:00
configure configure: fix test_pkg_config_cpp after 1e5acc1b59 2021-11-27 04:46:39 +01:00
CONTRIBUTING.md Add CONTRIBUTING.md 2016-09-18 10:02:13 +01:00
COPYING.GPLv2
COPYING.GPLv3
COPYING.LGPLv2.1
COPYING.LGPLv3
CREDITS
INSTALL.md INSTALL.md: Fix Markdown formatting 2019-01-31 10:29:16 -09:00
LICENSE.md avfilter/vf_geq: Relicense to LGPL 2019-12-28 11:20:48 +01:00
MAINTAINERS avformat: add Argonaut Games CVG demuxer 2021-05-12 20:25:50 +10:00
Makefile FATE: add a test for sliced scaling 2021-08-08 19:26:05 +02:00
README.md README: fix typo and description of libavfilter 2021-10-08 09:44:34 +05:30
RELEASE Bump Versions before release/4.4 branch 2021-03-20 01:01:12 +01:00

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 means to alter decoded audio and video through a directed graph of connected 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.