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stevxiao 7b2ae2ccf7 avcodec/d3d12va_encode: add intra refresh support for d3d12va encode 
Intra refresh is a technique that gradually refreshes the video by encoding rows or regions as intra macroblocks/CTUs spread over multiple frames, rather than using periodic I-frames.
This provides better error resilience for video streaming while maintaining more consistent bitrate.

Disable Intra Refresh (This is the default)
ffmpeg -init_hw_device d3d12va -hwaccel d3d12va -hwaccel_output_format d3d12 \
-i input.mp4 \
-c:v h264_d3d12va \
-intra_refresh_mode none \
-intra_refresh_duration 30 \
-g 60 \
output.h264

Enable Intra Refresh
ffmpeg -init_hw_device d3d12va -hwaccel d3d12va -hwaccel_output_format d3d12 \
-i input.mp4 \
-c:v h264_d3d12va \
-intra_refresh_mode row_based \
-intra_refresh_duration 30 \
-g 60 \
output.h264

Parameters
- `-intra_refresh_mode`: Set to `row_based` to enable row-based intra refresh, or `NONE` to disable
- `-intra_refresh_duration`: Number of frames over which to spread the intra refresh (default: 0 = use GOP size)
- `-g`: GOP size (should typically be larger than intra refresh duration)
2025-12-04 08:26:26 +00:00
.forgejo forgejo/workflows: make test shared/static mode more human readable 2025-11-26 23:21:11 +00:00
compat fftools: Fix MediaCodec on Android15+ 2025-11-23 12:53:43 +00:00
doc fftools/ffmpeg: add force key frame by scdet metadata support 2025-12-02 03:03:55 +00:00
ffbuild {lib{avcodec,swscale}/x86/,}Makefile: Kill MMX-OBJS 2025-11-30 22:20:13 +01:00
fftools fftools/cmdutils: use strcpy directly, the length is computed already 2025-12-03 23:45:44 +00:00
libavcodec avcodec/d3d12va_encode: add intra refresh support for d3d12va encode 2025-12-04 08:26:26 +00:00
libavdevice avdevice/gdigrab: suppress int to pointer cast warning 2025-12-03 23:45:44 +00:00
libavfilter avfilter/vf_feedback: fix feedback block 2025-12-03 21:23:51 +00:00
libavformat Revert "avformat/rawdec: set framerate in codec parameters" 2025-12-04 01:59:04 +00:00
libavutil avutil/vulkan: fix device memory size truncation 2025-12-03 23:45:44 +00:00
libswresample swresample/x86/Makefile: Only compile ASM init files when X86ASM is enabled 2025-11-30 22:20:13 +01:00
libswscale {lib{avcodec,swscale}/x86/,}Makefile: Kill MMX-OBJS 2025-11-30 22:20:13 +01:00
presets presets: remove moldering iPod presets 2014-06-17 16:15:04 -08:00
tests Revert "avformat/rawdec: set framerate in codec parameters" 2025-12-04 01:59:04 +00:00
tools tools/sofa2wavs: fix build on Windows 2025-11-29 21:43:12 +00:00
.gitattributes gitattributes: End merge conflicts in Changelog 2025-03-17 15:26:10 +01:00
.gitignore .gitignore: Add config_components.asm 2025-11-02 13:10:58 +00:00
.mailmap mailmap: add entry for myself 2025-08-08 21:51:15 +00:00
Changelog avcodec/rkmppenc: add h264/hevc rkmpp encoder 2025-11-27 15:54:49 +08:00
configure avcodec/d3d12va_encode: add intra refresh support for d3d12va encode 2025-12-04 08:26:26 +00:00
CONTRIBUTING.md Add CONTRIBUTING.md 2016-09-18 10:02:13 +01:00
COPYING.GPLv2 Rename COPYING.GPL --> COPYING.GPLv2 and COPYING.LGPL --> COPYING.LGPLv2.1. 2009-06-05 09:51:31 +00:00
COPYING.GPLv3 Add configure option to upgrade (L)GPL to version 3. 2009-06-05 11:04:03 +00:00
COPYING.LGPLv2.1 all: fix whitespace/new-line issues 2025-08-03 13:48:47 +02:00
COPYING.LGPLv3 Add configure option to upgrade (L)GPL to version 3. 2009-06-05 11:04:03 +00:00
CREDITS Use https for repository links 2023-03-01 21:59:10 +01:00
FUNDING.json Add FUNDING.json 2025-06-23 14:48:40 +02:00
INSTALL.md all: fix typos found by codespell 2025-08-03 13:48:47 +02:00
LICENSE.md Remove libpostproc 2025-05-07 15:35:47 +02:00
MAINTAINERS MAINTAINERS: Update the entries for AMF 2025-10-28 21:06:37 +00:00
Makefile {lib{avcodec,swscale}/x86/,}Makefile: Kill MMX-OBJS 2025-11-30 22:20:13 +01:00
README.md README: fix typo and description of libavfilter 2021-10-08 09:44:34 +05:30
RELEASE RELEASE: update to 8.0 2025-08-14 08:42:29 -04:00

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.