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Martin Storsjö ab8f7030bc aarch64: Use cntvct_el0 as timer register on Android and macOS 
The default timer register pmccntr_el0 usually requires enabling
access with e.g. a kernel module (while it is accessible by
default on Windows). On Linux, the default for checkasm benchmarks
is to use perf (if suitable headers are available) though.

On macOS, using cntvct_el0 gives measurements with the same
magnitude as mach_absolute_time (which is used currently), but
possibly with a little less overhead/noise.

Signed-off-by: Martin Storsjö <martin@martin.st>
 		2024-06-17 14:00:34 +03:00
compat avutil/common: Don't auto-include mem.h 2024-03-31 00:08:43 +01:00
doc avcodec: add external enc libvvenc for H266/VVC 2024-06-15 21:00:05 +08:00
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libavcodec avcodec/libx265: Don't copy A53 closed captions by default 2024-06-16 12:30:59 +02:00
libavdevice avdevice/xcbgrab: Check sscanf() return 2024-06-12 00:39:11 +02:00
libavfilter avfilter/vf_rotate: Check ff_draw_init2() return value 2024-06-12 00:39:14 +02:00
libavformat avformat/mxfdec: use the newly added channel ids for more exact mapping 2024-06-12 19:37:01 +02:00
libavutil aarch64: Use cntvct_el0 as timer register on Android and macOS 2024-06-17 14:00:34 +03:00
libpostproc avutil/common: Don't auto-include mem.h 2024-03-31 00:08:43 +01:00
libswresample avutil/common: Don't auto-include mem.h 2024-03-31 00:08:43 +01:00
libswscale swscale/x86/range_convert: add missing AVX2 preprocessor wrapper 2024-06-16 10:09:38 -03:00
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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.