mirror of https://git.ffmpeg.org/ffmpeg.git
doc/encoders.texi: Add doc for qsv
Add doc for qsv decoder. Add more option's introduction to qsv encoder. Signed-off-by: Wenbin Chen <wenbin.chen@intel.com> Signed-off-by: Haihao Xiang <haihao.xiang@intel.com>
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Wenbin Chen
Haihao Xiang
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@ -126,6 +126,48 @@ Set amount of frame threads to use during decoding. The default value is 0 (auto
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@end table
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@section QSV Decoders
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The family of Intel QuickSync Video decoders (VC1, MPEG-2, H.264, HEVC,
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JPEG/MJPEG, VP8, VP9, AV1).
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@subsection Common Options
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The following options are supported by all qsv decoders.
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@table @option
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@item @var{async_depth}
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Internal parallelization depth, the higher the value the higher the latency.
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@item @var{gpu_copy}
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A GPU-accelerated copy between video and system memory
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@table @samp
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@item default
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@item on
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@item off
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@end table
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@end table
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@subsection HEVC Options
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Extra options for hevc_qsv.
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@table @option
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@item @var{load_plugin}
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A user plugin to load in an internal session
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@table @samp
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@item none
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@item hevc_sw
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@item hevc_hw
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@end table
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@item @var{load_plugins}
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A :-separate list of hexadecimal plugin UIDs to load in an internal session
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@end table
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@c man end VIDEO DECODERS
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@chapter Audio Decoders
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@ -3123,12 +3123,13 @@ Setting a higher @option{bits_per_mb} limit will improve the speed.
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For the fastest encoding speed set the @option{qscale} parameter (4 is the
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recommended value) and do not set a size constraint.
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@section QSV encoders
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@section QSV Encoders
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The family of Intel QuickSync Video encoders (MPEG-2, H.264, HEVC, JPEG/MJPEG and VP9)
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The family of Intel QuickSync Video encoders (MPEG-2, H.264, HEVC, JPEG/MJPEG
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and VP9)
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@subsection Ratecontrol Method
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The ratecontrol method is selected as follows:
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@itemize @bullet
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@item
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When @option{global_quality} is specified, a quality-based mode is used.
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@ -3176,6 +3177,7 @@ Note that depending on your system, a different mode than the one you specified
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may be selected by the encoder. Set the verbosity level to @var{verbose} or
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higher to see the actual settings used by the QSV runtime.
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@subsection Global Options -> MSDK Options
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Additional libavcodec global options are mapped to MSDK options as follows:
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@itemize
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@ -3212,6 +3214,251 @@ encoder use CAVLC instead of CABAC.
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@end itemize
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@subsection Common Options
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Following options are used by all qsv encoders.
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@table @option
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@item @var{async_depth}
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Specifies how many asynchronous operations an application performs
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before the application explicitly synchronizes the result. If zero,
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the value is not specified.
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@item @var{avbr_accuracy}
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Accuracy of the AVBR ratecontrol (unit of tenth of percent).
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@item @var{avbr_convergence}
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Convergence of the AVBR ratecontrol (unit of 100 frames)
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The parameters @var{avbr_accuracy} and @var{avbr_convergence} are for the
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average variable bitrate control (AVBR) algorithm.
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The algorithm focuses on overall encoding quality while meeting the specified
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bitrate, @var{target_bitrate}, within the accuracy range @var{avbr_accuracy},
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after a @var{avbr_Convergence} period. This method does not follow HRD and the
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instant bitrate is not capped or padded.
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@item @var{preset}
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This option itemizes a range of choices from veryfast (best speed) to veryslow
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(best quality).
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@table @samp
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@item veryfast
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@item faster
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@item fast
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@item medium
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@item slow
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@item slower
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@item veryslow
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@end table
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@item @var{forced_idr}
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Forcing I frames as IDR frames.
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@item @var{low_power}
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For encoders set this flag to ON to reduce power consumption and GPU usage.
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@end table
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@subsection H264 options
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These options are used by h264_qsv
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@table @option
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@item @var{extbrc}
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Extended bitrate control.
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@item @var{recovery_point_sei}
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Set this flag to insert the recovery point SEI message at the beginning of every
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intra refresh cycle.
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@item @var{rdo}
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Enable rate distortion optimization.
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@item @var{max_frame_size}
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Maximum encoded frame size in bytes.
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@item @var{max_slice_size}
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Maximum encoded slice size in bytes.
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@item @var{bitrate_limit}
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Toggle bitrate limitations.
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Modifies bitrate to be in the range imposed by the QSV encoder. Setting this
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flag off may lead to violation of HRD conformance. Mind that specifying bitrate
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below the QSV encoder range might significantly affect quality. If on this
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option takes effect in non CQP modes: if bitrate is not in the range imposed
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by the QSV encoder, it will be changed to be in the range.
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@item @var{mbbrc}
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Setting this flag enables macroblock level bitrate control that generally
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improves subjective visual quality. Enabling this flag may have negative impact
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on performance and objective visual quality metric.
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@item @var{adaptive_i}
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This flag controls insertion of I frames by the QSV encoder. Turn ON this flag
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to allow changing of frame type from P and B to I.
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@item @var{adaptive_b}
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This flag controls changing of frame type from B to P.
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@item @var{b_strategy}
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This option controls usage of B frames as reference.
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@item @var{cavlc}
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If set, CAVLC is used; if unset, CABAC is used for encoding.
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@item @var{vcm}
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Video conferencing mode, please see ratecontrol method.
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@item @var{idr_interval}
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Distance (in I-frames) between IDR frames.
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@item @var{pic_timing_sei}
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Insert picture timing SEI with pic_struct_syntax element.
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@item @var{single_sei_nal_unit}
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Put all the SEI messages into one NALU.
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@item @var{max_dec_frame_buffering}
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Maximum number of frames buffered in the DPB.
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@item @var{look_ahead}
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Use VBR algorithm with look ahead.
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@item @var{look_ahead_depth}
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Depth of look ahead in number frames.
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@item @var{look_ahead_downsampling}
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Downscaling factor for the frames saved for the lookahead analysis.
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@table @samp
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@item unknown
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@item auto
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@item off
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@item 2x
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@item 4x
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@end table
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@item @var{int_ref_type}
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Specifies intra refresh type. The major goal of intra refresh is improvement of
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error resilience without significant impact on encoded bitstream size caused by
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I frames. The SDK encoder achieves this by encoding part of each frame in
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refresh cycle using intra MBs. @var{none} means no refresh. @var{vertical} means
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vertical refresh, by column of MBs.
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@item @var{int_ref_cycle_size}
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Specifies number of pictures within refresh cycle starting from 2. 0 and 1 are
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invalid values.
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@item @var{int_ref_qp_delta}
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Specifies QP difference for inserted intra MBs. This is signed value in
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[-51, 51] range if target encoding bit-depth for luma samples is 8 and this
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range is [-63, 63] for 10 bit-depth or [-75, 75] for 12 bit-depth respectively.
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@item @var{profile}
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@table @samp
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@item unknown
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@item baseline
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@item main
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@item high
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@end table
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@item @var{a53cc}
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Use A53 Closed Captions (if available).
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@item @var{aud}
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Insert the Access Unit Delimiter NAL.
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@item @var{mfmode}
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Multi-Frame Mode.
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@table @samp
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@item off
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@item auto
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@end table
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@item @var{repeat_pps}
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Repeat pps for every frame.
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@end table
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@subsection HEVC Options
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These options are used by hevc_qsv
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@table @option
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@item @var{extbrc}
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Extended bitrate control.
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@item @var{recovery_point_sei}
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Set this flag to insert the recovery point SEI message at the beginning of every
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intra refresh cycle.
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@item @var{rdo}
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Enable rate distortion optimization.
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@item @var{idr_interval}
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Distance (in I-frames) between IDR frames.
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@table @samp
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@item begin_only
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Output an IDR-frame only at the beginning of the stream.
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@end table
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@item @var{load_plugin}
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A user plugin to load in an internal session.
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@table @samp
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@item none
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@item hevc_sw
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@item hevc_hw
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@end table
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@item @var{load_plugins}
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A :-separate list of hexadecimal plugin UIDs to load in
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an internal session.
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@item @var{look_ahead_depth}
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Depth of look ahead in number frames, available when extbrc option is enabled.
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@item @var{profile}
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@table @samp
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@item unknown
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@item main
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@item main10
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@item mainsp
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@item rext
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@end table
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@item @var{gpb}
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1: GPB (generalized P/B frame)
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0: regular P frame.
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@item @var{tile_cols}
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Number of columns for tiled encoding.
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@item @var{tile_rows}
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Number of rows for tiled encoding.
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@item @var{aud}
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Insert the Access Unit Delimiter NAL.
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@end table
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@subsection MPEG2 Options
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These options are used by mpeg2_qsv
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@table @option
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@item @var{profile}
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@table @samp
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@item unknown
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@item simple
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@item main
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@item high
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@end table
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@end table
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@subsection VP9 Options
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These options are used by vp9_qsv
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@table @option
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@item @var{profile}
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@table @samp
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@item unknown
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@item profile0
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@item profile1
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@item profile2
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@item profile3
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@end table
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@end table
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@section snow
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@subsection Options
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