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Jonas Karlman 90124e1139 avcodec/v4l2request: Probe for a capable media and video device 
Probe all media devices and its linked video devices to locate a video
device that support stateless decoding of the specific codec using the
V4L2 Request API.

When AVV4L2RequestDeviceContext.media_fd is a valid file descriptor only
video devices for the opened media device is probed.
E.g. using a -init_hw_device v4l2request:/dev/media1 parameter.

A video device is deemed capable when all tests pass, e.g. kernel driver
support the codec, FFmpeg v4l2-request code know about the buffer format
and kernel driver report that the frame size is supported.

A codec specific hook, post_probe, is supported to e.g. test for codec
specific limitations, PROFILE and LEVEL controls.

Basic flow for initialization follow the kernel Memory-to-memory
Stateless Video Decoder Interface > Initialization [1].

[1] https://www.kernel.org/doc/html/latest/userspace-api/media/v4l/dev-stateless-decoder.html#initialization

Co-developed-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Co-developed-by: Alex Bee <knaerzche@gmail.com>
Signed-off-by: Alex Bee <knaerzche@gmail.com>
Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
2025-07-09 20:38:47 +00:00
compat compat: Fix the fallback definition of stdc_trailing_zeros 2024-09-24 14:00:27 +03:00
doc Update for 7.1 2024-09-29 18:47:04 +02:00
ffbuild riscv: add Zvbb vector bit manipulation extension 2024-05-11 11:38:49 +03:00
fftools fftools/ffmpeg: add support for multiview video 2024-09-23 17:15:02 +02:00
libavcodec avcodec/v4l2request: Probe for a capable media and video device 2025-07-09 20:38:47 +00:00
libavdevice avdevice/decklink_dec: fix leaks on error 2024-09-29 10:30:49 +02:00
libavfilter avfilter/vf_showinfo: add missing break to ViewID case 2024-09-24 16:09:05 -03:00
libavformat */version.h: bump minor versions for release/7.1 2024-09-24 17:07:30 +02:00
libavutil avutil/hwcontext: Add hwdevice type for V4L2 Request API 2025-07-09 20:38:47 +00:00
libpostproc */version.h: bump minor versions for release/7.1 2024-09-24 17:07:30 +02:00
libswresample */version.h: bump minor versions for release/7.1 2024-09-24 17:07:30 +02:00
libswscale */version.h: bump minor versions for release/7.1 2024-09-24 17:07:30 +02:00
presets
tests checkasm/sw_rgb: Revert test additions from e18b46d95f 2024-09-29 14:23:06 +03:00
tools tools/target_swr_fuzzer: Limit the number of samples 2024-09-24 15:37:18 +02:00
.gitattributes lavf/assenc: normalize line endings to \n 2024-02-11 17:01:07 -08:00
.gitignore
.mailmap mailmap: add entry for myself 2024-07-15 01:59:37 +02:00
Changelog Changelog: Mark for 7.1 2024-09-24 17:05:48 +02:00
configure avcodec/v4l2request: Probe for a capable media and video device 2025-07-09 20:38:47 +00:00
CONTRIBUTING.md
COPYING.GPLv2
COPYING.GPLv3
COPYING.LGPLv2.1
COPYING.LGPLv3
CREDITS
INSTALL.md
LICENSE.md
MAINTAINERS avcodec: Add common V4L2 Request API code 2025-07-09 20:38:47 +00:00
Makefile add tools/target_swr_fuzzer 2024-08-08 15:26:52 +02:00
README.md
RELEASE Update for 7.1 2024-09-29 18:47:04 +02:00
RELEASE_NOTES RELEASE_NOTES: Based on the version from 5.1 2024-09-29 18:47:04 +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 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.