-to and -t are mutually exclusive and -t has priority.
-@item -to @var{position} (@emph{output})
-Stop writing the output at @var{position}.
+@item -to @var{position} (@emph{input/output})
+Stop writing the output or reading the input at @var{position}.
@var{position} must be a time duration specification,
see @ref{time duration syntax,,the Time duration section in the ffmpeg-utils(1) manual,ffmpeg-utils}.
consists of only alphanumeric characters. The last key of a sequence of
progress information is always "progress".
+@anchor{stdin option}
@item -stdin
Enable interaction on standard input. On by default unless standard input is
used as an input. To explicitly disable interaction you need to specify
platform-appropriate subdevice (@samp{dxva2} or @samp{vaapi}) and then deriving a
QSV device from that.)
+@item opencl
+@var{device} selects the platform and device as @emph{platform_index.device_index}.
+
+The set of devices can also be filtered using the key-value pairs to find only
+devices matching particular platform or device strings.
+
+The strings usable as filters are:
+@table @option
+@item platform_profile
+@item platform_version
+@item platform_name
+@item platform_vendor
+@item platform_extensions
+@item device_name
+@item device_vendor
+@item driver_version
+@item device_version
+@item device_profile
+@item device_extensions
+@item device_type
+@end table
+
+The indices and filters must together uniquely select a device.
+
+Examples:
+@table @emph
+@item -init_hw_device opencl:0.1
+Choose the second device on the first platform.
+
+@item -init_hw_device opencl:,device_name=Foo9000
+Choose the device with a name containing the string @emph{Foo9000}.
+
+@item -init_hw_device opencl:1,device_type=gpu,device_extensions=cl_khr_fp16
+Choose the GPU device on the second platform supporting the @emph{cl_khr_fp16}
+extension.
+@end table
+
@end table
@item -init_hw_device @var{type}[=@var{name}]@@@var{source}