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README: update for ffmpeg-rockchip

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ffmpeg-rockchip
=============
This project aims to provide full hardware transcoding pipeline in FFmpeg CLI for Rockchip platforms that support MPP ([Media Process Platform](https://github.com/rockchip-linux/mpp)) and RGA ([2D Raster Graphic Acceleration](https://github.com/airockchip/librga)). This includes hardware decoders, encoders and filters. A typical target platform is RK3588/3588s based devices.
## Hightlights
* MPP decoders support up to 8K 10-bit H.264, HEVC, VP9 and AV1 decoding
* MPP decoders support producing AFBC (ARM Frame Buffer Compression) image
* MPP decoders support de-interlace using IEP (Image Enhancement Processor)
* MPP decoders support allocator half-internal and pure-external modes
* MPP encoders support up to 8K H.264 and HEVC encoding
* MPP encoders support async encoding, AKA frame-parallel
* MPP encoders support consuming AFBC image
* RGA filters support image scaling and pixel format conversion
* RGA filters support image cropping
* RGA filters support image transposing
* RGA filters support blending two images
* RGA filters support async operation
* RGA filters support producing and consuming AFBC image
* Zero-copy DMA in above stages
## How to use
The documentation is available on the [Wiki](https://github.com/nyanmisaka/ffmpeg-rockchip/wiki) page of this project.
## Codecs and filters
### Decoders/Hwaccel
```
V..... av1_rkmpp Rockchip MPP (Media Process Platform) AV1 decoder (codec av1)
V..... h263_rkmpp Rockchip MPP (Media Process Platform) H263 decoder (codec h263)
V..... h264_rkmpp Rockchip MPP (Media Process Platform) H264 decoder (codec h264)
V..... hevc_rkmpp Rockchip MPP (Media Process Platform) HEVC decoder (codec hevc)
V..... mjpeg_rkmpp Rockchip MPP (Media Process Platform) MJPEG decoder (codec mjpeg)
V..... mpeg1_rkmpp Rockchip MPP (Media Process Platform) MPEG1VIDEO decoder (codec mpeg1video)
V..... mpeg2_rkmpp Rockchip MPP (Media Process Platform) MPEG2VIDEO decoder (codec mpeg2video)
V..... mpeg4_rkmpp Rockchip MPP (Media Process Platform) MPEG4 decoder (codec mpeg4)
V..... vp8_rkmpp Rockchip MPP (Media Process Platform) VP8 decoder (codec vp8)
V..... vp9_rkmpp Rockchip MPP (Media Process Platform) VP9 decoder (codec vp9)
```
### Encoders
```
V..... h264_rkmpp Rockchip MPP (Media Process Platform) H264 encoder (codec h264)
V..... hevc_rkmpp Rockchip MPP (Media Process Platform) HEVC encoder (codec hevc)
V..... mjpeg_rkmpp Rockchip MPP (Media Process Platform) MJPEG encoder (codec mjpeg)
```
### Filters
```
... overlay_rkrga VV->V Rockchip RGA (2D Raster Graphic Acceleration) video compositor
... scale_rkrga V->V Rockchip RGA (2D Raster Graphic Acceleration) video resizer and format converter
... vpp_rkrga V->V Rockchip RGA (2D Raster Graphic Acceleration) video post-process (scale/crop/transpose)
```
## Important
* Rockchip BSP/vendor kernel is necessary, 5.10 and 6.1 are two tested versions.
* For the supported maximum resolution and FPS you can refer to the datasheet or TRM.
* User MUST be granted permission to access these device files.
```
# DRM allocator
/dev/dri
# DMA_HEAP allocator
/dev/dma_heap
# RGA filters
/dev/rga
# MPP codecs
/dev/mpp_service
# Optional, for compatibility with older kernels and socs
/dev/iep
/dev/mpp-service
/dev/vpu_service
/dev/vpu-service
/dev/hevc_service
/dev/hevc-service
/dev/rkvdec
/dev/rkvenc
/dev/vepu
/dev/h265e
```
## Todo
* Support MPP VP8 video encoder
* ...
## Acknowledgments
@[hbiyik](https://github.com/hbiyik) @[HermanChen](https://github.com/HermanChen) @[rigaya](https://github.com/rigaya)
---
FFmpeg README
=============