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)
This patch adds support for the texture array feature
used by AMD boards in the D3D12 HEVC encoder.
In texture array mode, a single texture array is shared for all
reference and reconstructed pictures using different subresources.
The implementation ensures compatibility
and has been successfully tested on AMD, Intel, and NVIDIA GPUs.
Add the max_frame_size option to support setting max frame size in
bytes. Max frame size is the maximum cap in the bitrate algorithm per
each encoded frame.
Signed-off-by: Tong Wu <wutong1208@outlook.com>
The aim of this is twofold: a) Clang warns when setting a deprecated
field in a definition and because several of the widely set
AVCodec fields are deprecated, one gets several hundred warnings
from Clang for an ordinary build. Yet fortunately Clang (unlike GCC)
allows to disable deprecation warnings inside a definition, so
that one can create simple macros to set these fields that also suppress
deprecation warnings for Clang. This has already been done in
fdff1b9cbf for AVCodec.channel_layouts.
b) Using macros will allow to easily migrate these fields to internal ones.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit cleans up and refactors the mess of private state upon
private state that used to be.
Now, FFHWBaseEncodePicture is fully initialized upon call-time,
and, most importantly, this lets APIs which require initialization
data for frames (VkImageViews) to initialize this for both the
input image, and the reconstruction (DPB) image.
Signed-off-by: Tong Wu <wutong1208@outlook.com>
This patch is to make FFHWBaseEncodeContext a standalone component
and avoid getting FFHWBaseEncodeContext from avctx->priv_data.
This patch also removes some unnecessary AVCodecContext arguments.
For receive_packet call, a small wrapper is introduced.
Signed-off-by: Tong Wu <tong1.wu@intel.com>
