When doing stream copy, copy also non-key frames found at the
beginning.
+@item -init_hw_device @var{type}[=@var{name}][:@var{device}[,@var{key=value}...]]
+Initialise a new hardware device of type @var{type} called @var{name}, using the
+given device parameters.
+If no name is specified it will receive a default name of the form "@var{type}%d".
+
+The meaning of @var{device} and the following arguments depends on the
+device type:
+@table @option
+
+@item cuda
+@var{device} is the number of the CUDA device.
+
+@item dxva2
+@var{device} is the number of the Direct3D 9 display adapter.
+
+@item vaapi
+@var{device} is either an X11 display name or a DRM render node.
+If not specified, it will attempt to open the default X11 display (@emph{$DISPLAY})
+and then the first DRM render node (@emph{/dev/dri/renderD128}).
+
+@item vdpau
+@var{device} is an X11 display name.
+If not specified, it will attempt to open the default X11 display (@emph{$DISPLAY}).
+
+@item qsv
+@var{device} selects a value in @samp{MFX_IMPL_*}. Allowed values are:
+@table @option
+@item auto
+@item sw
+@item hw
+@item auto_any
+@item hw_any
+@item hw2
+@item hw3
+@item hw4
+@end table
+If not specified, @samp{auto_any} is used.
+(Note that it may be easier to achieve the desired result for QSV by creating the
+platform-appropriate subdevice (@samp{dxva2} or @samp{vaapi}) and then deriving a
+QSV device from that.)
+
+@end table
+
+@item -init_hw_device @var{type}[=@var{name}]@@@var{source}
+Initialise a new hardware device of type @var{type} called @var{name},
+deriving it from the existing device with the name @var{source}.
+
+@item -init_hw_device list
+List all hardware device types supported in this build of ffmpeg.
+
+@item -filter_hw_device @var{name}
+Pass the hardware device called @var{name} to all filters in any filter graph.
+This can be used to set the device to upload to with the @code{hwupload} filter,
+or the device to map to with the @code{hwmap} filter. Other filters may also
+make use of this parameter when they require a hardware device. Note that this
+is typically only required when the input is not already in hardware frames -
+when it is, filters will derive the device they require from the context of the
+frames they receive as input.
+
+This is a global setting, so all filters will receive the same device.
+
@item -hwaccel[:@var{stream_specifier}] @var{hwaccel} (@emph{input,per-stream})
Use hardware acceleration to decode the matching stream(s). The allowed values
of @var{hwaccel} are:
@item dxva2
Use DXVA2 (DirectX Video Acceleration) hardware acceleration.
+@item vaapi
+Use VAAPI (Video Acceleration API) hardware acceleration.
+
@item qsv
Use the Intel QuickSync Video acceleration for video transcoding.
@item -hwaccel_device[:@var{stream_specifier}] @var{hwaccel_device} (@emph{input,per-stream})
Select a device to use for hardware acceleration.
-This option only makes sense when the @option{-hwaccel} option is also
-specified. Its exact meaning depends on the specific hardware acceleration
-method chosen.
-
-@table @option
-@item vdpau
-For VDPAU, this option specifies the X11 display/screen to use. If this option
-is not specified, the value of the @var{DISPLAY} environment variable is used
-
-@item dxva2
-For DXVA2, this option should contain the number of the display adapter to use.
-If this option is not specified, the default adapter is used.
-
-@item qsv
-For QSV, this option corresponds to the values of MFX_IMPL_* . Allowed values
-are:
-@table @option
-@item auto
-@item sw
-@item hw
-@item auto_any
-@item hw_any
-@item hw2
-@item hw3
-@item hw4
-@end table
-@end table
+This option only makes sense when the @option{-hwaccel} option is also specified.
+It can either refer to an existing device created with @option{-init_hw_device}
+by name, or it can create a new device as if
+@samp{-init_hw_device} @var{type}:@var{hwaccel_device}
+were called immediately before.
@item -hwaccels
List all hardware acceleration methods supported in this build of ffmpeg.
Default value is -1.
+@item -enc_time_base[:@var{stream_specifier}] @var{timebase} (@emph{output,per-stream})
+Set the encoder timebase. @var{timebase} is a floating point number,
+and can assume one of the following values:
+
+@table @option
+@item 0
+Assign a default value according to the media type.
+
+For video - use 1/framerate, for audio - use 1/samplerate.
+
+@item -1
+Use the input stream timebase when possible.
+
+If an input stream is not available, the default timebase will be used.
+
+@item >0
+Use the provided number as the timebase.
+
+This field can be provided as a ratio of two integers (e.g. 1:24, 1:48000)
+or as a floating point number (e.g. 0.04166, 2.0833e-5)
+@end table
+
+Default value is 0.
+
@item -shortest (@emph{output})
Finish encoding when the shortest input stream ends.
@item -dts_delta_threshold
projects / ffmpeg / blobdiff